ajava.beans.SimpleBeanInfo Maven / Gradle / Ivy
Show all versions of a-javabeans8 Show documentation
/*
* Copyright (c) 1996, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package ajava.beans;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.ImageProducer;
import java.net.URL;
/**
* This is a support class to make it easier for people to provide
* BeanInfo classes.
*
* It defaults to providing "noop" information, and can be selectively
* overriden to provide more explicit information on chosen topics.
* When the introspector sees the "noop" values, it will apply low
* level introspection and design patterns to automatically analyze
* the target bean.
*/
public class SimpleBeanInfo implements BeanInfo {
/**
* Deny knowledge about the class and customizer of the bean.
* You can override this if you wish to provide explicit info.
*/
public BeanDescriptor getBeanDescriptor() {
return null;
}
/**
* Deny knowledge of properties. You can override this
* if you wish to provide explicit property info.
*/
public PropertyDescriptor[] getPropertyDescriptors() {
return null;
}
/**
* Deny knowledge of a default property. You can override this
* if you wish to define a default property for the bean.
*/
public int getDefaultPropertyIndex() {
return -1;
}
/**
* Deny knowledge of event sets. You can override this
* if you wish to provide explicit event set info.
*/
public EventSetDescriptor[] getEventSetDescriptors() {
return null;
}
/**
* Deny knowledge of a default event. You can override this
* if you wish to define a default event for the bean.
*/
public int getDefaultEventIndex() {
return -1;
}
/**
* Deny knowledge of methods. You can override this
* if you wish to provide explicit method info.
*/
public MethodDescriptor[] getMethodDescriptors() {
return null;
}
/**
* Claim there are no other relevant BeanInfo objects. You
* may override this if you want to (for example) return a
* BeanInfo for a base class.
*/
public BeanInfo[] getAdditionalBeanInfo() {
return null;
}
/**
* Claim there are no icons available. You can override
* this if you want to provide icons for your bean.
*/
public Image getIcon(int iconKind) {
return null;
}
/**
* This is a utility method to help in loading icon images.
* It takes the name of a resource file associated with the
* current object's class file and loads an image object
* from that file. Typically images will be GIFs.
*
* @param resourceName A pathname relative to the directory
* holding the class file of the current class. For example,
* "wombat.gif".
* @return an image object. May be null if the load failed.
*/
public Image loadImage(final String resourceName) {
try {
final URL url = getClass().getResource(resourceName);
if (url != null) {
final ImageProducer ip = (ImageProducer) url.getContent();
if (ip != null) {
return Toolkit.getDefaultToolkit().createImage(ip);
}
}
} catch (final Exception ignored) {
}
return null;
}
}