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SimpleBeanInfo.java
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146 lines (132 loc) · 3.94 KB
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/*
* Copyright (c) 1996, 2011, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package java.beans;
/**
* This is a support class to make it easier for people to provide
* BeanInfo classes.
* <p>
* 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 java.awt.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.
* <p>
* @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 java.awt.Image loadImage(final String resourceName) {
try {
final Class<?> c = getClass();
java.awt.image.ImageProducer ip = (java.awt.image.ImageProducer)
java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction<Object>() {
public Object run() {
java.net.URL url;
if ((url = c.getResource(resourceName)) == null) {
return null;
} else {
try {
return url.getContent();
} catch (java.io.IOException ioe) {
return null;
}
}
}
});
if (ip == null)
return null;
java.awt.Toolkit tk = java.awt.Toolkit.getDefaultToolkit();
return tk.createImage(ip);
} catch (Exception ex) {
return null;
}
}
}