136 lines
4.4 KiB
Java
136 lines
4.4 KiB
Java
/*
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* Copyright (c) 1996, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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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.awt.image.ImageProducer;
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import java.net.URL;
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/**
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* This is a support class to make it easier for people to provide
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* BeanInfo classes.
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* <p>
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* It defaults to providing "noop" information, and can be selectively
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* overriden to provide more explicit information on chosen topics.
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* When the introspector sees the "noop" values, it will apply low
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* level introspection and design patterns to automatically analyze
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* the target bean.
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*/
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public class SimpleBeanInfo implements BeanInfo {
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/**
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* Deny knowledge about the class and customizer of the bean.
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* You can override this if you wish to provide explicit info.
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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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/**
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* Deny knowledge of properties. You can override this
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* if you wish to provide explicit property info.
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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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/**
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* Deny knowledge of a default property. You can override this
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* if you wish to define a default property for the bean.
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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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/**
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* Deny knowledge of event sets. You can override this
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* if you wish to provide explicit event set info.
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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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/**
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* Deny knowledge of a default event. You can override this
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* if you wish to define a default event for the bean.
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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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/**
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* Deny knowledge of methods. You can override this
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* if you wish to provide explicit method info.
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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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/**
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* Claim there are no other relevant BeanInfo objects. You
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* may override this if you want to (for example) return a
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* BeanInfo for a base class.
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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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/**
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* Claim there are no icons available. You can override
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* this if you want to provide icons for your bean.
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*/
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public Image getIcon(int iconKind) {
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return null;
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}
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/**
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* This is a utility method to help in loading icon images.
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* It takes the name of a resource file associated with the
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* current object's class file and loads an image object
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* from that file. Typically images will be GIFs.
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* <p>
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* @param resourceName A pathname relative to the directory
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* holding the class file of the current class. For example,
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* "wombat.gif".
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* @return an image object. May be null if the load failed.
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*/
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public Image loadImage(final String resourceName) {
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try {
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final URL url = getClass().getResource(resourceName);
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if (url != null) {
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final ImageProducer ip = (ImageProducer) url.getContent();
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if (ip != null) {
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return Toolkit.getDefaultToolkit().createImage(ip);
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}
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}
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} catch (final Exception ignored) {
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}
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return null;
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}
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}
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