1 files changed, 37 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/BaseFrameDecoder.java b/src/main/java/org/traccar/BaseFrameDecoder.java
new file mode 100644
index 000000000..f90f90e4b
--- /dev/null
+++ b/src/main/java/org/traccar/BaseFrameDecoder.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2018 Anton Tananaev (anton@traccar.org)
+ *
+ * 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 io.netty.buffer.ByteBuf;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.ByteToMessageDecoder;
+
+import java.util.List;
+
+public abstract class BaseFrameDecoder extends ByteToMessageDecoder {
+
+    @Override
+    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
+        Object decoded = decode(ctx, ctx != null ? ctx.channel() : null, in);
+        if (decoded != null) {
+            out.add(decoded);
+        }
+    }
+
+    protected abstract Object decode(ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception;
+
+}