147 lines
4.5 KiB
Java
147 lines
4.5 KiB
Java
/* java.beans.SimpleBeanInfo
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Copyright (C) 1998, 2006, 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.beans;
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import java.awt.Image;
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import java.awt.Toolkit;
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import java.net.URL;
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/**
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** SimpleBeanInfo is a class you may extend to more easily
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** provide select information to the Introspector. It
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** implements all of the methods in BeanInfo by returning
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** null and forces the Introspector to behave exactly as
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** if there were no BeanInfo class at all (Introspecting
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** everything).<P>
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**
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** Overriding one or two of these functions
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** to give explicit information on only those things you
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** wish to give explicit information is perfectly safe,
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** and even desirable.<P>
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**
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** See the BeanInfo class for information on what the
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** various methods actually do.
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**
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** @author John Keiser
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** @since JDK1.1
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** @version 1.1.0, 29 Jul 1998
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** @see java.beans.BeanInfo
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**/
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public class SimpleBeanInfo implements BeanInfo {
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/** Force Introspection of the general bean info.
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** @return <CODE>null</CODE>.
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**/
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public BeanDescriptor getBeanDescriptor() {
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return null;
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}
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/** Force Introspection of the events this Bean type
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** fires.
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** @return <CODE>null</CODE>
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**/
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public EventSetDescriptor[] getEventSetDescriptors() {
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return null;
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}
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/** Say that there is no "default" event set.
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** @return <CODE>-1</CODE>.
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**/
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public int getDefaultEventIndex() {
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return -1;
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}
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/** Force Introspection of the Bean properties.
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** @return <CODE>null</CODE>.
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**/
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public PropertyDescriptor[] getPropertyDescriptors() {
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return null;
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}
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/** Say that there is no "default" property.
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** @return <CODE>-1</CODE>.
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**/
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public int getDefaultPropertyIndex() {
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return -1;
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}
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/** Force Introspection of the Bean's methods.
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** @return <CODE>null</CODE>.
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**/
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public MethodDescriptor[] getMethodDescriptors() {
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return null;
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}
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/** Tell the Introspector to go look for other BeanInfo
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** itself.
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** @return <CODE>null</CODE>.
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**/
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public BeanInfo[] getAdditionalBeanInfo() {
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return null;
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}
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/** Say that this Bean has no icons.
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** @param iconType the type of icon
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** @return <CODE>null</CODE>.
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**/
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public Image getIcon(int iconType) {
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return null;
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}
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/** Helper method to load an image using the Bean class
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** getResource() method on the BeanInfo class (using
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** getClass(), since you'll extend this class to get
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** the BeanInfo). Basically it's assumed that the Bean
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** and its BeanInfo are both loaded by the same
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** ClassLoader, generally a reasonable assumption.
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** @param location the URL relative
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** @return the Image in question (possibly <code>null</code>).
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**/
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public Image loadImage(String location)
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{
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if (location == null)
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return null;
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URL url = getClass().getResource(location);
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if (url == null)
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return null;
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return Toolkit.getDefaultToolkit().getImage(url);
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}
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}
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