From 06411d4f4afcb69eafa24cadad267eb6681ddaa2 Mon Sep 17 00:00:00 2001
From: beckerdo <beckerdo@13f79535-47bb-0310-9956-ffa450edef68>
Date: Sun, 11 Jan 2009 22:14:15 +0000
Subject: TUSCANY-2332 Web services Holder support

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@733526 13f79535-47bb-0310-9956-ffa450edef68
---
 .../sca/core/invocation/JDKInvocationHandler.java  | 86 +++++++++++++++++++++-
 1 file changed, 82 insertions(+), 4 deletions(-)

(limited to 'branches/sca-java-1.x/modules/core')

diff --git a/branches/sca-java-1.x/modules/core/src/main/java/org/apache/tuscany/sca/core/invocation/JDKInvocationHandler.java b/branches/sca-java-1.x/modules/core/src/main/java/org/apache/tuscany/sca/core/invocation/JDKInvocationHandler.java
index a23b9af9ad..4216217028 100644
--- a/branches/sca-java-1.x/modules/core/src/main/java/org/apache/tuscany/sca/core/invocation/JDKInvocationHandler.java
+++ b/branches/sca-java-1.x/modules/core/src/main/java/org/apache/tuscany/sca/core/invocation/JDKInvocationHandler.java
@@ -23,6 +23,8 @@ import java.io.Serializable;
 import java.lang.reflect.InvocationHandler;
 import java.lang.reflect.Method;
 import java.lang.reflect.Proxy;
+import java.lang.reflect.Type;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -58,6 +60,10 @@ import org.osoa.sca.ConversationEndedException;
 import org.osoa.sca.ServiceReference;
 import org.osoa.sca.ServiceRuntimeException;
 
+import java.util.Iterator;
+import javax.xml.ws.Holder;
+
+
 /**
  * @version $Rev$ $Date$
  */
@@ -150,8 +156,24 @@ public class JDKInvocationHandler implements InvocationHandler, Serializable {
             throw new IllegalArgumentException("No matching operation is found: " + method);
         }
 
-        // send the invocation down the wire
-        Object result = invoke(chain, args, wire, source);
+        // Holder pattern. Items stored in a Holder<T> are promoted to T.
+        // After the invoke, the returned data <T> are placed back in Holder<T>.
+        Object [] promotedArgs = promoteHolderArgs( args );
+        
+        Object result = invoke(chain, promotedArgs, wire, source);
+
+        // Returned Holder data <T> are placed back in Holder<T>.
+        Class [] parameters = method.getParameterTypes();
+        if ( parameters != null ) {
+            for ( int i = 0; i < parameters.length; i++ ) {
+               Class parameterType = parameters[ i ];              
+               if ( isHolder( parameterType ) ) {
+                  // Pop results and place in holder (demote).
+                  Holder holder = (Holder) args[ i ]; 
+                  holder.value = result;
+               }            
+            }
+        }
 
         return result;
     }
@@ -272,8 +294,9 @@ public class JDKInvocationHandler implements InvocationHandler, Serializable {
         }
         Invoker headInvoker = chain.getHeadInvoker();
         Operation operation = chain.getTargetOperation();
-        msg.setOperation(operation);
-        msg.setBody(args);
+        
+        msg.setOperation(operation);       
+        msg.setBody( args );
 
         Message msgContext = ThreadMessageContext.getMessageContext();
         Object currentConversationID = msgContext.getFrom().getReferenceParameters().getConversationID();
@@ -513,4 +536,59 @@ public class JDKInvocationHandler implements InvocationHandler, Serializable {
 
     }
 
+    
+    /**
+     * Creates a copy of arguments. Holder<T> values are promoted to T.
+     * Note. It is essential that arg Holders not be destroyed here.
+     * PromotedArgs should not destroy holders. They are used on response return.
+     * @param args containing Holders and other objects.
+     * @return Object [] 
+     */
+    protected static Object [] promoteHolderArgs( Object [] args ) {
+       if ( args == null )
+           return args;
+       Object [] promotedArgs = new Object[ args.length ];
+       
+       for ( int i = 0; i < args.length; i++ ) {
+          Object argument = args[ i ];
+          if ( argument != null ) {
+              if ( isHolder( argument ) ) {
+                 promotedArgs[ i ] = ((Holder)argument).value;      
+              } else {
+                 promotedArgs[ i ] = args[ i ];
+              }
+              
+          }
+       }
+       return promotedArgs;
+    }
+
+    /**
+     * Given a Class, tells if it is a Holder by comparing to "javax.xml.ws.Holder"
+     * @param testClass
+     * @return boolean whether class is Holder type.
+     */
+    protected static boolean isHolder( Class testClass ) {
+        if ( testClass.getName().startsWith( "javax.xml.ws.Holder" )) {
+            return true;
+        }
+        return false;        
+    }
+
+     
+    /**
+     * Given an Object, tells if it is a Holder by comparing to "javax.xml.ws.Holder"
+     * @param testClass
+     * @return boolean stating whether Object is a Holder type.
+     * @author DOB
+     */
+    protected static boolean isHolder( Object object ) {
+        String objectName = object.getClass().getName();
+        if ( object instanceof javax.xml.ws.Holder ) {
+            return true;
+        }
+        return false;        
+    }
+
+
 }
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