1 files changed, 61 insertions, 0 deletions
diff --git a/src/org/traccar/ExtendedObjectDecoder.java b/src/org/traccar/ExtendedObjectDecoder.java
new file mode 100644
index 000000000..55a75bb67
--- /dev/null
+++ b/src/org/traccar/ExtendedObjectDecoder.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * 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.traccar;
+
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelEvent;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.channel.MessageEvent;
+import org.jboss.netty.handler.codec.oneone.OneToOneDecoder;
+
+import java.net.SocketAddress;
+
+import static org.jboss.netty.channel.Channels.fireMessageReceived;
+
+public abstract class ExtendedObjectDecoder extends OneToOneDecoder {
+
+    @Override
+    public void handleUpstream(
+            ChannelHandlerContext ctx, ChannelEvent evt) throws Exception {
+        if (!(evt instanceof MessageEvent)) {
+            ctx.sendUpstream(evt);
+            return;
+        }
+
+        MessageEvent e = (MessageEvent) evt;
+        Object originalMessage = e.getMessage();
+        Object decodedMessage = decode(ctx, e.getChannel(), e.getRemoteAddress(), originalMessage);
+        if (originalMessage == decodedMessage) {
+            ctx.sendUpstream(evt);
+        } else if (decodedMessage != null) {
+            fireMessageReceived(ctx, decodedMessage, e.getRemoteAddress());
+        }
+    }
+    
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+        
+        return decode(ctx, channel, msg);
+    }
+    
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
+        
+        return null; // default implementation
+    }
+
+}