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-rw-r--r--src/org/traccar/BaseFrameDecoder.java37
1 files changed, 37 insertions, 0 deletions
diff --git a/src/org/traccar/BaseFrameDecoder.java b/src/org/traccar/BaseFrameDecoder.java
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+++ b/src/org/traccar/BaseFrameDecoder.java
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+/*
+ * 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;
+
+}