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BeanDescriptor.java
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109 lines (97 loc) · 2.85 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;
import java.lang.ref.Reference;
/**
* A BeanDescriptor provides global information about a "bean",
* including its Java class, its displayName, etc.
* <p>
* This is one of the kinds of descriptor returned by a BeanInfo object,
* which also returns descriptors for properties, method, and events.
*/
public class BeanDescriptor extends FeatureDescriptor {
private Reference<? extends Class<?>> beanClassRef;
private Reference<? extends Class<?>> customizerClassRef;
/**
* Create a BeanDescriptor for a bean that doesn't have a customizer.
*
* @param beanClass The Class object of the Java class that implements
* the bean. For example sun.beans.OurButton.class.
*/
public BeanDescriptor(Class<?> beanClass) {
this(beanClass, null);
}
/**
* Create a BeanDescriptor for a bean that has a customizer.
*
* @param beanClass The Class object of the Java class that implements
* the bean. For example sun.beans.OurButton.class.
* @param customizerClass The Class object of the Java class that implements
* the bean's Customizer. For example sun.beans.OurButtonCustomizer.class.
*/
public BeanDescriptor(Class<?> beanClass, Class<?> customizerClass) {
this.beanClassRef = getWeakReference(beanClass);
this.customizerClassRef = getWeakReference(customizerClass);
String name = beanClass.getName();
while (name.indexOf('.') >= 0) {
name = name.substring(name.indexOf('.')+1);
}
setName(name);
}
/**
* Gets the bean's Class object.
*
* @return The Class object for the bean.
*/
public Class<?> getBeanClass() {
return (this.beanClassRef != null)
? this.beanClassRef.get()
: null;
}
/**
* Gets the Class object for the bean's customizer.
*
* @return The Class object for the bean's customizer. This may
* be null if the bean doesn't have a customizer.
*/
public Class<?> getCustomizerClass() {
return (this.customizerClassRef != null)
? this.customizerClassRef.get()
: null;
}
/*
* Package-private dup constructor
* This must isolate the new object from any changes to the old object.
*/
BeanDescriptor(BeanDescriptor old) {
super(old);
beanClassRef = old.beanClassRef;
customizerClassRef = old.customizerClassRef;
}
void appendTo(StringBuilder sb) {
appendTo(sb, "beanClass", this.beanClassRef);
appendTo(sb, "customizerClass", this.customizerClassRef);
}
}