180 lines
5.3 KiB
Java
180 lines
5.3 KiB
Java
/* FilterWriter.java -- Parent class for output streams that filter
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Copyright (C) 1998, 1999, 2001 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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.io;
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/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
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* "The Java Language Specification", ISBN 0-201-63451-1
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* Status: Complete to version 1.1.
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*/
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/**
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* This class is the common superclass of output character stream classes
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* that filter the output they write. These classes typically transform the
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* data in some way prior to writing it out to another underlying
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* <code>Writer</code>. This class simply overrides all the
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* methods in <code>Writer</code> to redirect them to the
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* underlying stream. Subclasses provide actual filtering.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Tom Tromey <tromey@cygnus.com>
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*/
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public abstract class FilterWriter extends Writer
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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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/**
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* This is the subordinate <code>Writer</code> that this class
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* redirects its method calls to.
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*/
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protected Writer out;
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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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* This method initializes an instance of <code>FilterWriter</code>
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* to write to the specified subordinate <code>Writer</code>.
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* The given <code>Writer</code> will be used as <code>lock</code> for
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* the newly created <code>FilterWriter</code>.
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*
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* @param out The <code>Writer</code> to write to
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*/
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protected
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FilterWriter(Writer out)
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{
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super(out);
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this.out = out;
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}
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/*************************************************************************/
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/*
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* Instance Methods
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*/
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/**
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* This method closes the underlying <code>Writer</code>. Any
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* further attempts to write to this stream may throw an exception.
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*
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* @exception IOException If an error occurs
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*/
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public void
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close() throws IOException
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{
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out.close();
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}
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/*************************************************************************/
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/**
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* This method attempt to flush all buffered output to be written to the
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* underlying output sink.
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*
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* @exception IOException If an error occurs
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*/
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public void
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flush() throws IOException
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{
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out.flush();
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}
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/*************************************************************************/
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/**
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* This method writes a single char of output to the underlying
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* <code>Writer</code>.
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*
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* @param b The char to write, passed as an int.
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*
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* @exception IOException If an error occurs
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*/
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public void
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write(int b) throws IOException
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{
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out.write(b);
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}
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/*************************************************************************/
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/**
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* This method writes <code>len</code> chars from the array <code>buf</code>
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* starting at index <code>offset</code> to the underlying
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* <code>Writer</code>.
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*
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* @param buf The char array to write chars from
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* @param offset The index into the array to start writing chars from
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* @param len The number of chars to write
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*
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* @exception IOException If an error occurs
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*/
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public void
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write(char[] buf, int offset, int len) throws IOException
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{
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out.write(buf, offset, len);
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}
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/*************************************************************************/
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/**
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* This method writes <code>len</code> chars from the <code>String</code>
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* starting at position <code>offset</code>.
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*
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* @param str The <code>String</code> that is to be written
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* @param offset The character offset into the <code>String</code> to start writing from
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* @param len The number of chars to write
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*
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* @exception IOException If an error occurs
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*/
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public void
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write(String str, int offset, int len) throws IOException
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{
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out.write(str, offset, len);
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}
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} // class FilterWriter
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