1035 lines
29 KiB
Java
1035 lines
29 KiB
Java
/* DataFlavor.java -- A type of data to transfer via the clipboard.
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Copyright (C) 1999, 2001, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.datatransfer;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.ObjectInput;
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import java.io.ObjectOutput;
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import java.io.Reader;
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import java.io.StringReader;
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import java.io.UnsupportedEncodingException;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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/**
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* This class represents a particular data format used for transferring
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* data via the clipboard.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public class DataFlavor implements java.io.Externalizable, Cloneable
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{
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static final long serialVersionUID = 8367026044764648243L;
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// FIXME: Serialization: Need to write methods for.
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/**
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* This is the data flavor used for tranferring plain text. The MIME
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* type is "text/plain; charset=unicode". The representation class
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* is <code>java.io.InputStream</code>.
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*
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* @deprecated The charset unicode is platform specific and InputStream
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* deals with bytes not chars. Use <code>getRederForText()</code>.
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*/
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public static final DataFlavor plainTextFlavor;
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/**
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* This is the data flavor used for transferring Java strings. The
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* MIME type is "application/x-java-serialized-object" and the
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* representation class is <code>java.lang.String</code>.
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*/
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public static final DataFlavor stringFlavor;
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/**
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* This is a data flavor used for transferring lists of files. The
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* representation type is a <code>java.util.List</code>, with each element of
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* the list being a <code>java.io.File</code>.
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*/
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public static final DataFlavor javaFileListFlavor;
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/**
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* This is an image flavor used for transferring images. The
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* representation type is a <code>java.awt.Image</code>.
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*/
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public static final DataFlavor imageFlavor;
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/**
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* This is the MIME type used for transferring a serialized object.
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* The representation class is the type of object be deserialized.
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*/
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public static final String javaSerializedObjectMimeType =
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"application/x-java-serialized-object";
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/**
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* This is the MIME type used to transfer a Java object reference within
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* the same JVM. The representation class is the class of the object
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* being transferred.
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*/
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public static final String javaJVMLocalObjectMimeType =
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"application/x-java-jvm-local-objectref";
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/**
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* This is the MIME type used to transfer a link to a remote object.
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* The representation class is the type of object being linked to.
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*/
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public static final String javaRemoteObjectMimeType =
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"application/x-java-remote-object";
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static
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{
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plainTextFlavor
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= new DataFlavor(java.io.InputStream.class,
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"text/plain; charset=unicode",
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"plain unicode text");
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stringFlavor
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= new DataFlavor(java.lang.String.class,
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"Java Unicode String");
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javaFileListFlavor
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= new DataFlavor(java.util.List.class,
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"Java File List");
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// javaFileListFlavor.mimeType = "application/x-java-file-list";
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imageFlavor
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= new DataFlavor(java.awt.Image.class,
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"Java Image");
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}
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/*************************************************************************/
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/*
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* Instance Variables
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*/
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// The MIME type for this flavor
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private final String mimeType;
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// The representation class for this flavor
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private final Class representationClass;
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// The human readable name of this flavor
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private String humanPresentableName;
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/*************************************************************************/
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/*
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* Static Methods
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*/
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/**
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* This method attempts to load the named class. The following class
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* loaders are searched in order: the bootstrap class loader, the
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* system class loader, the context class loader (if it exists), and
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* the specified fallback class loader.
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*
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* @param className The name of the class to load.
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* @param classLoader The class loader to use if all others fail, which
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* may be <code>null</code>.
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*
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* @exception ClassNotFoundException If the class cannot be loaded.
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*/
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protected static final Class
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tryToLoadClass(String className, ClassLoader classLoader)
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throws ClassNotFoundException
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{
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try
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{
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return(Class.forName(className));
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}
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catch(Exception e) { ; }
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// Commented out for Java 1.1
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/*
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try
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{
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return(className.getClass().getClassLoader().findClass(className));
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}
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catch(Exception e) { ; }
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try
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{
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return(ClassLoader.getSystemClassLoader().findClass(className));
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}
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catch(Exception e) { ; }
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*/
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// FIXME: What is the context class loader?
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/*
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try
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{
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}
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catch(Exception e) { ; }
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*/
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if (classLoader != null)
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return(classLoader.loadClass(className));
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else
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throw new ClassNotFoundException(className);
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}
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/*************************************************************************/
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/*
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* Constructors
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*/
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/**
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* Empty public constructor needed for externalization.
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* Should not be used for normal instantiation.
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*/
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public
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DataFlavor()
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{
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mimeType = null;
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representationClass = null;
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humanPresentableName = null;
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}
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/*************************************************************************/
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/**
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* Private constructor.
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*/
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private
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DataFlavor(Class representationClass,
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String mimeType,
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String humanPresentableName)
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{
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this.representationClass = representationClass;
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this.mimeType = mimeType;
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if (humanPresentableName != null)
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this.humanPresentableName = humanPresentableName;
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else
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this.humanPresentableName = mimeType;
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}
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/*************************************************************************/
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/**
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* Initializes a new instance of <code>DataFlavor</code>. The class
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* and human readable name are specified, the MIME type will be
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* "application/x-java-serialized-object". If the human readable name
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* is not specified (<code>null</code>) then the human readable name
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* will be the same as the MIME type.
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*
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* @param representationClass The representation class for this object.
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* @param humanPresentableName The display name of the object.
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*/
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public
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DataFlavor(Class representationClass, String humanPresentableName)
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{
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this(representationClass,
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"application/x-java-serialized-object"
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+ "; class="
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+ representationClass.getName(),
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humanPresentableName);
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}
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/*************************************************************************/
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/**
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* Initializes a new instance of <code>DataFlavor</code> with the
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* specified MIME type and description. If the MIME type has a
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* "class=<rep class>" parameter then the representation class will
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* be the class name specified. Otherwise the class defaults to
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* <code>java.io.InputStream</code>. If the human readable name
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* is not specified (<code>null</code>) then the human readable name
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* will be the same as the MIME type.
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*
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* @param mimeType The MIME type for this flavor.
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* @param humanPresentableName The display name of this flavor.
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* @param classLoader The class loader for finding classes if the default
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* class loaders do not work.
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*
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* @exception IllegalArgumentException If the representation class
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* specified cannot be loaded.
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* @exception ClassNotFoundException If the class is not loaded.
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*/
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public
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DataFlavor(String mimeType, String humanPresentableName,
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ClassLoader classLoader) throws ClassNotFoundException
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{
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this(getRepresentationClassFromMime(mimeType, classLoader),
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mimeType, humanPresentableName);
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}
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private static Class
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getRepresentationClassFromMime(String mimeString, ClassLoader classLoader)
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{
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String classname = getParameter("class", mimeString);
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if (classname != null)
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{
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try
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{
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return tryToLoadClass(classname, classLoader);
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}
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catch(Exception e)
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{
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throw new IllegalArgumentException("classname: " + e.getMessage());
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}
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}
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else
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{
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return java.io.InputStream.class;
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}
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}
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/*************************************************************************/
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/**
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* Initializes a new instance of <code>DataFlavor</code> with the
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* specified MIME type and description. If the MIME type has a
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* "class=<rep class>" parameter then the representation class will
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* be the class name specified. Otherwise the class defaults to
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* <code>java.io.InputStream</code>. If the human readable name
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* is not specified (<code>null</code>) then the human readable name
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* will be the same as the MIME type. This is the same as calling
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* <code>new DataFlavor(mimeType, humanPresentableName, null)</code>.
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*
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* @param mimeType The MIME type for this flavor.
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* @param humanPresentableName The display name of this flavor.
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*
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* @exception IllegalArgumentException If the representation class
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* specified cannot be loaded.
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*/
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public
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DataFlavor(String mimeType, String humanPresentableName)
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{
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this (getRepresentationClassFromMime (mimeType, null), humanPresentableName);
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}
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/*************************************************************************/
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/**
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* Initializes a new instance of <code>DataFlavor</code> with the specified
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* MIME type. This type can have a "class=" parameter to specify the
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* representation class, and then the class must exist or an exception will
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* be thrown. If there is no "class=" parameter then the representation class
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* will be <code>java.io.InputStream</code>. This is the same as calling
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* <code>new DataFlavor(mimeType, null)</code>.
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*
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* @param mimeType The MIME type for this flavor.
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*
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* @exception IllegalArgumentException If a class is not specified in
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* the MIME type.
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* @exception ClassNotFoundException If the class cannot be loaded.
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*/
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public
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DataFlavor(String mimeType) throws ClassNotFoundException
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{
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this(mimeType, null);
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}
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/*************************************************************************/
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/**
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* Returns the MIME type of this flavor.
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*
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* @return The MIME type for this flavor.
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*/
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public String
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getMimeType()
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{
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return(mimeType);
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}
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/*************************************************************************/
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/**
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* Returns the representation class for this flavor.
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*
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* @return The representation class for this flavor.
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*/
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public Class
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getRepresentationClass()
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{
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return(representationClass);
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}
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/*************************************************************************/
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/**
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* Returns the human presentable name for this flavor.
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*
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* @return The human presentable name for this flavor.
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*/
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public String
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getHumanPresentableName()
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{
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return(humanPresentableName);
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}
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/*************************************************************************/
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/**
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* Returns the primary MIME type for this flavor.
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*
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* @return The primary MIME type for this flavor.
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*/
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public String
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getPrimaryType()
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{
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int idx = mimeType.indexOf("/");
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if (idx == -1)
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return(mimeType);
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return(mimeType.substring(0, idx));
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}
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/*************************************************************************/
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/**
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* Returns the MIME subtype for this flavor.
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*
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* @return The MIME subtype for this flavor.
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*/
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public String
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getSubType()
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{
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int idx = mimeType.indexOf("/");
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if (idx == -1)
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return("");
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String subtype = mimeType.substring(idx + 1);
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idx = subtype.indexOf(" ");
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if (idx == -1)
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return(subtype);
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else
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return(subtype.substring(0, idx));
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}
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/*************************************************************************/
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/**
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* Returns the value of the named MIME type parameter, or <code>null</code>
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* if the parameter does not exist. Given the parameter name and the mime
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* string.
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*
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* @param paramName The name of the parameter.
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* @param mimeString The mime string from where the name should be found.
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*
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* @return The value of the parameter or null.
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*/
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private static String
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getParameter(String paramName, String mimeString)
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{
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int idx = mimeString.indexOf(paramName + "=");
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if (idx == -1)
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return(null);
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String value = mimeString.substring(idx + paramName.length() + 1);
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idx = value.indexOf(" ");
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if (idx == -1)
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return(value);
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else
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return(value.substring(0, idx));
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}
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/*************************************************************************/
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/**
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* Returns the value of the named MIME type parameter, or <code>null</code>
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* if the parameter does not exist.
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*
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* @param paramName The name of the paramter.
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*
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* @return The value of the parameter.
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*/
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public String
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getParameter(String paramName)
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{
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return getParameter(paramName, mimeType);
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}
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/*************************************************************************/
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/**
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* Sets the human presentable name to the specified value.
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*
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* @param humanPresentableName The new display name.
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*/
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public void
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setHumanPresentableName(String humanPresentableName)
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{
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this.humanPresentableName = humanPresentableName;
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}
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/*************************************************************************/
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/**
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* Tests the MIME type of this object for equality against the specified
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* MIME type.
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*
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* @param mimeType The MIME type to test against.
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*
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* @return <code>true</code> if the MIME type is equal to this object's
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* MIME type, <code>false</code> otherwise.
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*
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* @exception NullPointerException If mimeType is null.
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*/
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public boolean
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isMimeTypeEqual(String mimeType)
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{
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// FIXME: Need to handle default attributes and parameters
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return(this.mimeType.equals(mimeType));
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}
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/*************************************************************************/
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/**
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* Tests the MIME type of this object for equality against the specified
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* data flavor's MIME type
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*
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* @param flavor The flavor to test against.
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*
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* @return <code>true</code> if the flavor's MIME type is equal to this
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* object's MIME type, <code>false</code> otherwise.
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*/
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public final boolean
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isMimeTypeEqual(DataFlavor flavor)
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{
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return(isMimeTypeEqual(flavor.getMimeType()));
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}
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/*************************************************************************/
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/**
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* Tests whether or not this flavor represents a serialized object.
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*
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* @return <code>true</code> if this flavor represents a serialized
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* object, <code>false</code> otherwise.
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*/
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public boolean
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isMimeTypeSerializedObject()
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{
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return(mimeType.startsWith(javaSerializedObjectMimeType));
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}
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/*************************************************************************/
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/**
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* Tests whether or not this flavor has a representation class of
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* <code>java.io.InputStream</code>.
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*
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* @return <code>true</code> if the representation class of this flavor
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* is <code>java.io.InputStream</code>, <code>false</code> otherwise.
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*/
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public boolean
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isRepresentationClassInputStream()
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{
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return(representationClass.getName().equals("java.io.InputStream"));
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}
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/*************************************************************************/
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/**
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* Tests whether the representation class for this flavor is
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* serializable.
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*
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* @return <code>true</code> if the representation class is serializable,
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* <code>false</code> otherwise.
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*/
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public boolean
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isRepresentationClassSerializable()
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{
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Class[] interfaces = representationClass.getInterfaces();
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int i = 0;
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while (i < interfaces.length)
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{
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if (interfaces[i].getName().equals("java.io.Serializable"))
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return(true);
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++i;
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}
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return(false);
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}
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/*************************************************************************/
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|
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/**
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|
* Tests whether the representation class for his flavor is remote.
|
|
*
|
|
* @return <code>true</code> if the representation class is remote,
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
public boolean
|
|
isRepresentationClassRemote()
|
|
{
|
|
// FIXME: Implement
|
|
throw new RuntimeException("Not implemented");
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Tests whether or not this flavor represents a serialized object.
|
|
*
|
|
* @return <code>true</code> if this flavor represents a serialized
|
|
* object, <code>false</code> otherwise.
|
|
*/
|
|
public boolean
|
|
isFlavorSerializedObjectType()
|
|
{
|
|
// FIXME: What is the diff between this and isMimeTypeSerializedObject?
|
|
return(mimeType.startsWith(javaSerializedObjectMimeType));
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Tests whether or not this flavor represents a remote object.
|
|
*
|
|
* @return <code>true</code> if this flavor represents a remote object,
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
public boolean
|
|
isFlavorRemoteObjectType()
|
|
{
|
|
return(mimeType.startsWith(javaRemoteObjectMimeType));
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Tests whether or not this flavor represents a list of files.
|
|
*
|
|
* @return <code>true</code> if this flavor represents a list of files,
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
public boolean
|
|
isFlavorJavaFileListType()
|
|
{
|
|
if (this.mimeType.equals(javaFileListFlavor.mimeType) &&
|
|
this.representationClass.equals(javaFileListFlavor.representationClass))
|
|
return(true);
|
|
|
|
return(false);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns a copy of this object.
|
|
*
|
|
* @return A copy of this object.
|
|
*
|
|
* @exception CloneNotSupportedException If the object's class does not support
|
|
* the Cloneable interface. Subclasses that override the clone method can also
|
|
* throw this exception to indicate that an instance cannot be cloned.
|
|
*/
|
|
public Object clone () throws CloneNotSupportedException
|
|
{
|
|
try
|
|
{
|
|
return(super.clone());
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
return(null);
|
|
}
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* This method test the specified <code>DataFlavor</code> for equality
|
|
* against this object. This will be true if the MIME type and
|
|
* representation type are the equal.
|
|
*
|
|
* @param flavor The <code>DataFlavor</code> to test against.
|
|
*
|
|
* @return <code>true</code> if the flavor is equal to this object,
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
public boolean
|
|
equals(DataFlavor flavor)
|
|
{
|
|
if (flavor == null)
|
|
return(false);
|
|
|
|
if (!this.mimeType.toLowerCase().equals(flavor.mimeType.toLowerCase()))
|
|
return(false);
|
|
|
|
if (!this.representationClass.equals(flavor.representationClass))
|
|
return(false);
|
|
|
|
return(true);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* This method test the specified <code>Object</code> for equality
|
|
* against this object. This will be true if the following conditions
|
|
* are met:
|
|
* <p>
|
|
* <ul>
|
|
* <li>The object is not <code>null</code>.</li>
|
|
* <li>The object is an instance of <code>DataFlavor</code>.</li>
|
|
* <li>The object's MIME type and representation class are equal to
|
|
* this object's.</li>
|
|
* </ul>
|
|
*
|
|
* @param obj The <code>Object</code> to test against.
|
|
*
|
|
* @return <code>true</code> if the flavor is equal to this object,
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
public boolean
|
|
equals(Object obj)
|
|
{
|
|
if (!(obj instanceof DataFlavor))
|
|
return(false);
|
|
|
|
return(equals((DataFlavor)obj));
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Tests whether or not the specified string is equal to the MIME type
|
|
* of this object.
|
|
*
|
|
* @param str The string to test against.
|
|
*
|
|
* @return <code>true</code> if the string is equal to this object's MIME
|
|
* type, <code>false</code> otherwise.
|
|
*
|
|
* @deprecated Not compatible with <code>hashCode()</code>.
|
|
* Use <code>isMimeTypeEqual()</code>
|
|
*/
|
|
public boolean
|
|
equals(String str)
|
|
{
|
|
return(isMimeTypeEqual(str));
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns the hash code for this data flavor.
|
|
* The hash code is based on the (lower case) mime type and the
|
|
* representation class.
|
|
*/
|
|
public int
|
|
hashCode()
|
|
{
|
|
return(mimeType.toLowerCase().hashCode()^representationClass.hashCode());
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns <code>true</code> when the given <code>DataFlavor</code>
|
|
* matches this one.
|
|
*/
|
|
public boolean
|
|
match(DataFlavor dataFlavor)
|
|
{
|
|
// XXX - How is this different from equals?
|
|
return(equals(dataFlavor));
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* This method exists for backward compatibility. It simply returns
|
|
* the same name/value pair passed in.
|
|
*
|
|
* @param name The parameter name.
|
|
* @param value The parameter value.
|
|
*
|
|
* @return The name/value pair.
|
|
*
|
|
* @deprecated
|
|
*/
|
|
protected String
|
|
normalizeMimeTypeParameter(String name, String value)
|
|
{
|
|
return(name + "=" + value);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* This method exists for backward compatibility. It simply returns
|
|
* the MIME type string unchanged.
|
|
*
|
|
* @param type The MIME type.
|
|
*
|
|
* @return The MIME type.
|
|
*
|
|
* @deprecated
|
|
*/
|
|
protected String
|
|
normalizeMimeType(String type)
|
|
{
|
|
return(type);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Serialize this class.
|
|
*
|
|
* @param stream The <code>ObjectOutput</code> stream to serialize to.
|
|
*
|
|
* @exception IOException If an error occurs.
|
|
*/
|
|
public void
|
|
writeExternal(ObjectOutput stream) throws IOException
|
|
{
|
|
// FIXME: Implement me
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* De-serialize this class.
|
|
*
|
|
* @param stream The <code>ObjectInput</code> stream to deserialize from.
|
|
*
|
|
* @exception IOException If an error ocurs.
|
|
* @exception ClassNotFoundException If the class for an object being restored
|
|
* cannot be found.
|
|
*/
|
|
public void
|
|
readExternal(ObjectInput stream) throws IOException, ClassNotFoundException
|
|
{
|
|
// FIXME: Implement me
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns a string representation of this DataFlavor. Including the
|
|
* representation class name, MIME type and human presentable name.
|
|
*/
|
|
public String
|
|
toString()
|
|
{
|
|
return("DataFlavor[representationClass="
|
|
+ representationClass.getName()
|
|
+ ",mimeType="
|
|
+ mimeType
|
|
+ "humanPresentableName="
|
|
+ humanPresentableName);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* XXX - Currently returns <code>plainTextFlavor</code>.
|
|
*/
|
|
public static final DataFlavor
|
|
getTextPlainUnicodeFlavor()
|
|
{
|
|
return(plainTextFlavor);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* XXX - Currently returns <code>java.io.InputStream</code>.
|
|
*
|
|
* @since 1.3
|
|
*/
|
|
public final Class
|
|
getDefaultRepresentationClass()
|
|
{
|
|
return(java.io.InputStream.class);
|
|
}
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* XXX - Currently returns <code>java.io.InputStream</code>.
|
|
*/
|
|
public final String
|
|
getDefaultRepresentationClassAsString()
|
|
{
|
|
return(getDefaultRepresentationClass().getName());
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Selects the best supported text flavor on this implementation.
|
|
* Returns <code>null</code> when none of the given flavors is liked.
|
|
*
|
|
* The <code>DataFlavor</code> returned the first data flavor in the
|
|
* array that has either a representation class which is (a subclass of)
|
|
* <code>Reader</code> or <code>String</code>, or has a representation
|
|
* class which is (a subclass of) <code>InputStream</code> and has a
|
|
* primary MIME type of "text" and has an supported encoding.
|
|
*/
|
|
public static final DataFlavor
|
|
selectBestTextFlavor(DataFlavor[] availableFlavors)
|
|
{
|
|
for(int i=0; i<availableFlavors.length; i++)
|
|
{
|
|
DataFlavor df = availableFlavors[i];
|
|
Class c = df.representationClass;
|
|
|
|
// A Reader or String is good.
|
|
if ((Reader.class.isAssignableFrom(c))
|
|
|| (String.class.isAssignableFrom(c)))
|
|
{
|
|
return df;
|
|
}
|
|
|
|
// A InputStream is good if the mime primary type is "text"
|
|
if ((InputStream.class.isAssignableFrom(c))
|
|
&& ("text".equals(df.getPrimaryType())))
|
|
{
|
|
String encoding = availableFlavors[i].getParameter("charset");
|
|
if (encoding == null)
|
|
encoding = "us-ascii";
|
|
Reader r = null;
|
|
try
|
|
{
|
|
// Try to construct a dummy reader with the found encoding
|
|
r = new InputStreamReader
|
|
(new ByteArrayInputStream(new byte[0]), encoding);
|
|
}
|
|
catch(UnsupportedEncodingException uee) { /* ignore */ }
|
|
if (r != null)
|
|
return df;
|
|
}
|
|
}
|
|
|
|
// Nothing found
|
|
return(null);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Creates a <code>Reader</code> for a given <code>Transferable</code>.
|
|
*
|
|
* If the representation class is a (subclass of) <code>Reader</code>
|
|
* then an instance of the representation class is returned. If the
|
|
* representatation class is a <code>String</code> then a
|
|
* <code>StringReader</code> is returned. And if the representation class
|
|
* is a (subclass of) <code>InputStream</code> and the primary MIME type
|
|
* is "text" then a <code>InputStreamReader</code> for the correct charset
|
|
* encoding is returned.
|
|
*
|
|
* @param transferable The <code>Transferable</code> for which a text
|
|
* <code>Reader</code> is requested.
|
|
*
|
|
* @exception IllegalArgumentException If the representation class is not one
|
|
* of the seven listed above or the Transferable has null data.
|
|
* @exception NullPointerException If the Transferable is null.
|
|
* @exception UnsupportedFlavorException when the transferable doesn't
|
|
* support this <code>DataFlavor</code>. Or if the representable class
|
|
* isn't a (subclass of) <code>Reader</code>, <code>String</code>,
|
|
* <code>InputStream</code> and/or the primary MIME type isn't "text".
|
|
* @exception IOException when any IOException occurs.
|
|
* @exception UnsupportedEncodingException if the "charset" isn't supported
|
|
* on this platform.
|
|
*/
|
|
public Reader getReaderForText(Transferable transferable)
|
|
throws UnsupportedFlavorException, IOException
|
|
{
|
|
if (!transferable.isDataFlavorSupported(this))
|
|
throw new UnsupportedFlavorException(this);
|
|
|
|
if (Reader.class.isAssignableFrom(representationClass))
|
|
return((Reader)transferable.getTransferData(this));
|
|
|
|
if (String.class.isAssignableFrom(representationClass))
|
|
return(new StringReader((String)transferable.getTransferData(this)));
|
|
|
|
if (InputStream.class.isAssignableFrom(representationClass)
|
|
&& "text".equals(getPrimaryType()))
|
|
{
|
|
InputStream in = (InputStream)transferable.getTransferData(this);
|
|
String encoding = getParameter("charset");
|
|
if (encoding == null)
|
|
encoding = "us-ascii";
|
|
return(new InputStreamReader(in, encoding));
|
|
}
|
|
|
|
throw new UnsupportedFlavorException(this);
|
|
}
|
|
|
|
/**
|
|
* Returns whether the representation class for this DataFlavor is
|
|
* @see java.nio.ByteBuffer or a subclass thereof.
|
|
*
|
|
* @since 1.4
|
|
*/
|
|
public boolean isRepresentationClassByteBuffer ()
|
|
{
|
|
return ByteBuffer.class.isAssignableFrom (representationClass);
|
|
}
|
|
|
|
/**
|
|
* Returns whether the representation class for this DataFlavor is
|
|
* @see java.nio.CharBuffer or a subclass thereof.
|
|
*
|
|
* @since 1.4
|
|
*/
|
|
public boolean isRepresentationClassCharBuffer ()
|
|
{
|
|
return CharBuffer.class.isAssignableFrom (representationClass);
|
|
}
|
|
|
|
/**
|
|
* Returns whether the representation class for this DataFlavor is
|
|
* @see java.io.Reader or a subclass thereof.
|
|
*
|
|
* @since 1.4
|
|
*/
|
|
public boolean isRepresentationClassReader ()
|
|
{
|
|
return Reader.class.isAssignableFrom (representationClass);
|
|
}
|
|
|
|
} // class DataFlavor
|
|
|