Adding copy constructor

jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/protocol/WebSocketFrame.java

@@ -87,10 +87,13 @@ public class WebSocketFrame implements Frame
     private OpCode opcode = null;
     private boolean masked = false;
     private byte mask[];
+    /**
+     * The payload data.
+     * <p>
+     * It is assumed to always be in FLUSH mode (ready to read) in this object.
+     */
     private ByteBuffer data;
-
     private boolean continuation = false;
-
     private int continuationIndex = 0;
 
     /**
@@ -110,6 +113,33 @@ public class WebSocketFrame implements Frame
         this.opcode = opcode;
     }
 
+    /**
+     * Copy constructor for the websocket frame.
+     * <p>
+     * Note: the underlying payload is merely a {@link ByteBuffer#slice()} of the input frame.
+     * 
+     * @param copy
+     *            the websocket to copy.
+     */
+    public WebSocketFrame(WebSocketFrame copy)
+    {
+        fin = copy.rsv1;
+        rsv1 = copy.rsv2;
+        rsv2 = copy.rsv2;
+        rsv3 = copy.rsv3;
+        opcode = copy.opcode;
+        masked = copy.masked;
+        mask = null;
+        if (copy.mask != null)
+        {
+            mask = new byte[copy.mask.length];
+            System.arraycopy(copy.mask,0,mask,0,mask.length);
+        }
+        data = copy.data.slice();
+        continuationIndex = copy.continuationIndex;
+        continuation = copy.continuation;
+    }
+
     public void assertValid()
     {
         if (opcode.isControlFrame())
@@ -341,7 +371,6 @@ public class WebSocketFrame implements Frame
         BufferUtil.clearToFill(data);
         data.put(buf,0,len);
         BufferUtil.flipToFlush(data,0);
-        BufferUtil.flipToFill(data);
         return this;
     }
 
@@ -368,9 +397,9 @@ public class WebSocketFrame implements Frame
         }
 
         data = ByteBuffer.allocate(len);
-        BufferUtil.clearToFill(data);
+        BufferUtil.clear(data);
         data.put(buf,0,len);
-        BufferUtil.flipToFill(data);
+        BufferUtil.flipToFlush(data,0);
         return this;
     }