Remove duplicate dependency declaration
[controller.git] / opendaylight / netconf / netconf-netty-util / src / main / java / org / opendaylight / controller / netconf / nettyutil / handler / NetconfEXIToMessageDecoder.java
1 /*
2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
3  *
4  * This program and the accompanying materials are made available under the
5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6  * and is available at http://www.eclipse.org/legal/epl-v10.html
7  */
8 package org.opendaylight.controller.netconf.nettyutil.handler;
9
10 import com.google.common.base.Preconditions;
11 import io.netty.buffer.ByteBuf;
12 import io.netty.buffer.ByteBufInputStream;
13 import io.netty.buffer.ByteBufUtil;
14 import io.netty.channel.ChannelHandlerContext;
15 import io.netty.handler.codec.ByteToMessageDecoder;
16 import java.io.InputStream;
17 import java.util.List;
18 import javax.xml.transform.TransformerFactory;
19 import javax.xml.transform.dom.DOMResult;
20 import javax.xml.transform.sax.SAXTransformerFactory;
21 import javax.xml.transform.sax.TransformerHandler;
22 import org.opendaylight.controller.netconf.api.NetconfMessage;
23 import org.openexi.sax.EXIReader;
24 import org.slf4j.Logger;
25 import org.slf4j.LoggerFactory;
26 import org.w3c.dom.Document;
27 import org.xml.sax.InputSource;
28
29 public final class NetconfEXIToMessageDecoder extends ByteToMessageDecoder {
30
31     private static final Logger LOG = LoggerFactory.getLogger(NetconfEXIToMessageDecoder.class);
32
33     private final NetconfEXICodec codec;
34
35     public NetconfEXIToMessageDecoder(final NetconfEXICodec codec) {
36         this.codec = Preconditions.checkNotNull(codec);
37     }
38
39     @Override
40     protected void decode(final ChannelHandlerContext ctx, final ByteBuf in, final List<Object> out) throws Exception {
41         /*
42          * Note that we could loop here and process all the messages, but we can't do that.
43          * The reason is <stop-exi> operation, which has the contract of immediately stopping
44          * the use of EXI, which means the next message needs to be decoded not by us, but rather
45          * by the XML decoder.
46          */
47
48         // If empty Byte buffer is passed to r.parse, EOFException is thrown
49         if (in.isReadable() == false) {
50             LOG.debug("No more content in incoming buffer.");
51             return;
52         }
53
54         LOG.trace("Received to decode: {}", ByteBufUtil.hexDump(in));
55
56         final EXIReader r = codec.getReader();
57
58         final SAXTransformerFactory transformerFactory
59             = (SAXTransformerFactory) TransformerFactory.newInstance();
60         final TransformerHandler handler = transformerFactory.newTransformerHandler();
61         r.setContentHandler(handler);
62
63         final DOMResult domResult = new DOMResult();
64         handler.setResult(domResult);
65
66         try (final InputStream is = new ByteBufInputStream(in)) {
67             r.parse(new InputSource(is));
68         }
69
70         out.add(new NetconfMessage((Document) domResult.getNode()));
71     }
72 }

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