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From jcar...@apache.org
Subject svn commit: r278756 - in /jakarta/commons/sandbox/proxy/trunk/src: java/org/apache/commons/proxy/ProxyUtils.java java/org/apache/commons/proxy/handler/NullInvocationHandler.java test/org/apache/commons/proxy/TestProxyUtils.java
Date Mon, 05 Sep 2005 14:43:36 GMT
Author: jcarman
Date: Mon Sep  5 07:43:32 2005
New Revision: 278756

URL: http://svn.apache.org/viewcvs?rev=278756&view=rev
Log:
Implementing Null Object pattern.

Added:
    jakarta/commons/sandbox/proxy/trunk/src/java/org/apache/commons/proxy/ProxyUtils.java
  (with props)
    jakarta/commons/sandbox/proxy/trunk/src/test/org/apache/commons/proxy/TestProxyUtils.java
  (with props)
Modified:
    jakarta/commons/sandbox/proxy/trunk/src/java/org/apache/commons/proxy/handler/NullInvocationHandler.java

Added: jakarta/commons/sandbox/proxy/trunk/src/java/org/apache/commons/proxy/ProxyUtils.java
URL: http://svn.apache.org/viewcvs/jakarta/commons/sandbox/proxy/trunk/src/java/org/apache/commons/proxy/ProxyUtils.java?rev=278756&view=auto
==============================================================================
--- jakarta/commons/sandbox/proxy/trunk/src/java/org/apache/commons/proxy/ProxyUtils.java
(added)
+++ jakarta/commons/sandbox/proxy/trunk/src/java/org/apache/commons/proxy/ProxyUtils.java
Mon Sep  5 07:43:32 2005
@@ -0,0 +1,49 @@
+/* $Id$
+ *
+ * Copyright 2005 The Apache Software Foundation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.proxy;
+
+import org.apache.commons.proxy.handler.NullInvocationHandler;
+
+/**
+ * @author James Carman
+ * @version 1.0
+ */
+public class ProxyUtils
+{
+    /**
+     * Creates a "null object" which implements the <code>proxyInterfaces</code>.
+     * @param proxyFactory the proxy factory to be used to create the proxy object
+     * @param proxyInterfaces the proxy interfaces
+     * @return a "null object" which implements the <code>proxyInterfaces</code>.
+     */
+    public static Object createNullObject( ProxyFactory proxyFactory, Class... proxyInterfaces
)
+    {
+        return proxyFactory.createInvocationHandlerProxy( new NullInvocationHandler(), proxyInterfaces
);
+    }
+
+    /**
+     * Creates a "null object" which implements the <code>proxyInterfaces</code>.
+     * @param proxyFactory the proxy factory to be used to create the proxy object
+     * @param classLoader the class loader to be used by the proxy factory to create the
proxy object
+     * @param proxyInterfaces the proxy interfaces
+     * @return a "null object" which implements the <code>proxyInterfaces</code>.
+     */
+    public static Object createNullObject( ProxyFactory proxyFactory, ClassLoader classLoader,
Class... proxyInterfaces )
+    {
+        return proxyFactory.createInvocationHandlerProxy( classLoader, new NullInvocationHandler(),
proxyInterfaces );
+    }
+}

Propchange: jakarta/commons/sandbox/proxy/trunk/src/java/org/apache/commons/proxy/ProxyUtils.java
------------------------------------------------------------------------------
    svn:eol-style = native

Propchange: jakarta/commons/sandbox/proxy/trunk/src/java/org/apache/commons/proxy/ProxyUtils.java
------------------------------------------------------------------------------
    svn:keywords = Id

Modified: jakarta/commons/sandbox/proxy/trunk/src/java/org/apache/commons/proxy/handler/NullInvocationHandler.java
URL: http://svn.apache.org/viewcvs/jakarta/commons/sandbox/proxy/trunk/src/java/org/apache/commons/proxy/handler/NullInvocationHandler.java?rev=278756&r1=278755&r2=278756&view=diff
==============================================================================
--- jakarta/commons/sandbox/proxy/trunk/src/java/org/apache/commons/proxy/handler/NullInvocationHandler.java
(original)
+++ jakarta/commons/sandbox/proxy/trunk/src/java/org/apache/commons/proxy/handler/NullInvocationHandler.java
Mon Sep  5 07:43:32 2005
@@ -34,7 +34,43 @@
 
     public Object invoke( Object proxy, Method method, Object[] args ) throws Throwable
     {
-        return null;
+        final Class<?> returnType = method.getReturnType();
+        if( returnType.isPrimitive() )
+        {
+            if( Integer.TYPE.equals( returnType ) )
+            {
+                return 0;
+            }
+            else if( Long.TYPE.equals( returnType ) )
+            {
+                return 0L;
+            }
+            else if( Double.TYPE.equals( returnType ) )
+            {
+                return 0.0;
+            }
+            else if( Float.TYPE.equals( returnType ) )
+            {
+                return 0.0f;
+            }
+            else if( Short.TYPE.equals( returnType ) )
+            {
+                return ( short )0;
+            }
+            else if( Character.TYPE.equals( returnType ) )
+            {
+                return ( char )0;
+            }
+            else if( Byte.TYPE.equals( returnType ) )
+            {
+                return ( byte )0;
+            }
+            return 0;
+        }
+        else
+        {
+            return null;
+        }
     }
 }
 

Added: jakarta/commons/sandbox/proxy/trunk/src/test/org/apache/commons/proxy/TestProxyUtils.java
URL: http://svn.apache.org/viewcvs/jakarta/commons/sandbox/proxy/trunk/src/test/org/apache/commons/proxy/TestProxyUtils.java?rev=278756&view=auto
==============================================================================
--- jakarta/commons/sandbox/proxy/trunk/src/test/org/apache/commons/proxy/TestProxyUtils.java
(added)
+++ jakarta/commons/sandbox/proxy/trunk/src/test/org/apache/commons/proxy/TestProxyUtils.java
Mon Sep  5 07:43:32 2005
@@ -0,0 +1,33 @@
+/* $Id$
+ *
+ * Copyright 2005 The Apache Software Foundation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.proxy;
+import junit.framework.*;
+import org.apache.commons.proxy.ProxyUtils;
+import org.apache.commons.proxy.factory.cglib.CglibProxyFactory;
+import org.apache.commons.proxy.factory.javassist.JavassistProxyFactory;
+import org.apache.commons.proxy.util.Echo;
+
+public class TestProxyUtils extends TestCase
+{
+    public void testCreateNullObject() throws Exception
+    {
+        final Echo nullEcho = ( Echo )ProxyUtils.createNullObject( new JavassistProxyFactory(),
Echo.class );
+        assertNull( nullEcho.echoBack( "hello" ) );
+        assertNull( nullEcho.echoBack( "hello", "world" ) );
+        assertEquals( ( int ) 0, nullEcho.echoBack( 12345 ) );
+    }
+}
\ No newline at end of file

Propchange: jakarta/commons/sandbox/proxy/trunk/src/test/org/apache/commons/proxy/TestProxyUtils.java
------------------------------------------------------------------------------
    svn:eol-style = native

Propchange: jakarta/commons/sandbox/proxy/trunk/src/test/org/apache/commons/proxy/TestProxyUtils.java
------------------------------------------------------------------------------
    svn:keywords = Id



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