Introspector creates indexed property descriptor from non-indexed property

Name: chT40241 Date: 08/25/98


/**
 * This sample program demonstrates a bug in the
 * java.beans.Introspector.
 * The bug is that the Introspector creates an indexed property
 * from the IntrospectorTestSubClass below. The get/set
 * methods for the property are those of a non-indexed
 * property. The Introspector should create either a
 * non-indexed property or create both an indexed and
 * non-indexed property.
 *
 * This can be worked around by providing additional BeanInfo
 * for the class.
 * However, that is cumbersome for a large class library.
 *
 * Output from program:
 * <PRE>
 * Descriptor: java.beans.IndexedPropertyDescriptor@1ec96f
 * Read method: public java.lang.Object
 * com.sastest.beans.IntrospectorTestSubClass.getFoo()
 * Write method: public void
 * com.sastest.beans.IntrospectorTestSubClass.setFoo
 * (java.lang.Object)
 * </PRE>
*/
package com.sastest.beans;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;

public class IntrospectorTest {
   public static void main( String[] args ) {
      try {
         BeanInfo beanInfo =
                   Introspector.getBeanInfo(
                                IntrospectorTestSubClass.class );
         PropertyDescriptor[] descriptors =
                               beanInfo.getPropertyDescriptors();
         for ( int i = 0; i < descriptors.length; i++ ) {
            if ( descriptors[i].getName().equals( "foo" ) ) {
               System.out.println( "Descriptor: " +
                                    descriptors[i] );
               System.out.println( "Read method: " +
                                descriptors[i].getReadMethod() );
               System.out.println( "Write method: " +
                               descriptors[i].getWriteMethod() );
               } // if
          } // for
      }
      catch (Exception e) {
         System.out.println( "Exception: " + e );
      }
   }
}

/**
 * This class approximates java.awt.TextField with the "foo"
 * property standing in for "preferredSize".
 */
class IntrospectorTestBaseClass {
   private Object foo;
   public Object getFoo() {
      return foo;
   }
   public Object getFoo( int bar ) {
      return new Integer(bar);
   }
}

/**
 * This class approximates our subclass of java.awt.TextField
 * with the "foo" property standing in for "preferredSize".
 */
class IntrospectorTestSubClass extends IntrospectorTestBaseClass {
   private Object foo;
   public void setFoo( Object foo ) {
      this.foo = foo;
   }
}

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