From ce57ab760f69de6db452def7ffbf5b114a2d8694 Mon Sep 17 00:00:00 2001
From: mark <mark@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 10 Mar 2006 21:46:48 +0000
Subject:        Imported GNU Classpath 0.90        * scripts/makemake.tcl: Set
 gnu/java/awt/peer/swing to ignore.        * gnu/classpath/jdwp/VMFrame.java
 (SIZE): New constant.        * java/lang/VMCompiler.java: Use
 gnu.java.security.hash.MD5.        * java/lang/Math.java: New override file. 
       * java/lang/Character.java: Merged from Classpath.        (start, end):
 Now 'int's.        (canonicalName): New field.        (CANONICAL_NAME,
 NO_SPACES_NAME, CONSTANT_NAME): New constants.        (UnicodeBlock): Added
 argument.        (of): New overload.        (forName): New method.       
 Updated unicode blocks.        (sets): Updated.        * sources.am:
 Regenerated.        * Makefile.in: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@111942 138bc75d-0d04-0410-961f-82ee72b054a4
---
 .../classpath/java/beans/PropertyDescriptor.java   | 67 ++++++++++++++++++++++
 1 file changed, 67 insertions(+)

(limited to 'libjava/classpath/java/beans/PropertyDescriptor.java')

diff --git a/libjava/classpath/java/beans/PropertyDescriptor.java b/libjava/classpath/java/beans/PropertyDescriptor.java
index a22d6252e28..da2ca78ae67 100644
--- a/libjava/classpath/java/beans/PropertyDescriptor.java
+++ b/libjava/classpath/java/beans/PropertyDescriptor.java
@@ -37,6 +37,8 @@ exception statement from your version. */
 
 package java.beans;
 
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 
 /**
@@ -344,6 +346,71 @@ public class PropertyDescriptor extends FeatureDescriptor
         this.propertyEditorClass = propertyEditorClass;
     }
 
+    /**
+     * Instantiate a property editor using the property editor class.
+     * If no property editor class has been set, this will return null.
+     * If the editor class has a public constructor which takes a single
+     * argument, that will be used and the bean parameter will be passed
+     * to it.  Otherwise, a public no-argument constructor will be used,
+     * if available.  This method will return null if no constructor is
+     * found or if construction fails for any reason.
+     * @param bean the argument to the constructor
+     * @return a new PropertyEditor, or null on error
+     * @since 1.5
+     */
+    public PropertyEditor createPropertyEditor(Object bean)
+    {
+      if (propertyEditorClass == null)
+        return null;
+      Constructor c = findConstructor(propertyEditorClass,
+                                      new Class[] { Object.class });
+      if (c != null)
+        return instantiateClass(c, new Object[] { bean });
+      c = findConstructor(propertyEditorClass, null);
+      if (c != null)
+        return instantiateClass(c, null);
+      return null;
+    }
+
+    // Helper method to look up a constructor and return null if it is not
+    // found.
+    private Constructor findConstructor(Class k, Class[] argTypes)
+    {
+      try
+        {
+          return k.getConstructor(argTypes);
+        }
+      catch (NoSuchMethodException _)
+        {
+          return null;
+        }
+    }
+
+    // Helper method to instantiate an object but return null on error.
+    private PropertyEditor instantiateClass(Constructor c, Object[] args)
+    {
+      try
+        {
+          return (PropertyEditor) c.newInstance(args);
+        }
+      catch (InstantiationException _)
+        {
+          return null;
+        }
+      catch (InvocationTargetException _)
+        {
+          return null;
+        }
+      catch (IllegalAccessException _)
+        {
+          return null;
+        }
+      catch (ClassCastException _)
+        {
+          return null;
+        }
+    }
+
     private void findMethods(
         Class beanClass,
         String getMethodName1,
-- 
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