1   /*
    2    * Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package java.beans;
   27   
   28   import java.lang.ref.Reference;
   29   
   30   /**
   31    * A BeanDescriptor provides global information about a "bean",
   32    * including its Java class, its displayName, etc.
   33    * <p>
   34    * This is one of the kinds of descriptor returned by a BeanInfo object,
   35    * which also returns descriptors for properties, method, and events.
   36    */
   37   
   38   public class BeanDescriptor extends FeatureDescriptor {
   39   
   40       private Reference<Class> beanClassRef;
   41       private Reference<Class> customizerClassRef;
   42   
   43       /**
   44        * Create a BeanDescriptor for a bean that doesn't have a customizer.
   45        *
   46        * @param beanClass  The Class object of the Java class that implements
   47        *          the bean.  For example sun.beans.OurButton.class.
   48        */
   49       public BeanDescriptor(Class<?> beanClass) {
   50           this(beanClass, null);
   51       }
   52   
   53       /**
   54        * Create a BeanDescriptor for a bean that has a customizer.
   55        *
   56        * @param beanClass  The Class object of the Java class that implements
   57        *          the bean.  For example sun.beans.OurButton.class.
   58        * @param customizerClass  The Class object of the Java class that implements
   59        *          the bean's Customizer.  For example sun.beans.OurButtonCustomizer.class.
   60        */
   61       public BeanDescriptor(Class<?> beanClass, Class<?> customizerClass) {
   62           this.beanClassRef = getWeakReference((Class)beanClass);
   63           this.customizerClassRef = getWeakReference((Class)customizerClass);
   64   
   65           String name = beanClass.getName();
   66           while (name.indexOf('.') >= 0) {
   67               name = name.substring(name.indexOf('.')+1);
   68           }
   69           setName(name);
   70       }
   71   
   72       /**
   73        * Gets the bean's Class object.
   74        *
   75        * @return The Class object for the bean.
   76        */
   77       public Class<?> getBeanClass() {
   78           return (this.beanClassRef != null)
   79                   ? this.beanClassRef.get()
   80                   : null;
   81       }
   82   
   83       /**
   84        * Gets the Class object for the bean's customizer.
   85        *
   86        * @return The Class object for the bean's customizer.  This may
   87        * be null if the bean doesn't have a customizer.
   88        */
   89       public Class<?> getCustomizerClass() {
   90           return (this.customizerClassRef != null)
   91                   ? this.customizerClassRef.get()
   92                   : null;
   93       }
   94   
   95       /*
   96        * Package-private dup constructor
   97        * This must isolate the new object from any changes to the old object.
   98        */
   99       BeanDescriptor(BeanDescriptor old) {
  100           super(old);
  101           beanClassRef = old.beanClassRef;
  102           customizerClassRef = old.customizerClassRef;
  103       }
  104   
  105       void appendTo(StringBuilder sb) {
  106           appendTo(sb, "beanClass", this.beanClassRef);
  107           appendTo(sb, "customizerClass", this.customizerClassRef);
  108       }
  109   }