+/*
+ * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.netconf.util.handler;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufInputStream;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.ByteToMessageDecoder;
+
+import java.io.InputStream;
+import java.util.List;
+
+import javax.xml.transform.dom.DOMResult;
+import javax.xml.transform.sax.SAXTransformerFactory;
+import javax.xml.transform.sax.TransformerHandler;
+
+import org.opendaylight.controller.netconf.api.NetconfMessage;
+import org.openexi.sax.EXIReader;
+import org.w3c.dom.Document;
+import org.xml.sax.InputSource;
+
+import com.google.common.base.Preconditions;
+
+public final class NetconfEXIToMessageDecoder extends ByteToMessageDecoder {
+ private static final SAXTransformerFactory saxTransformerFactory = (SAXTransformerFactory)SAXTransformerFactory.newInstance();
+
+ // FIXME: is this needed?
+ // private static final SAXParserFactory saxParserFactory;
+ // static {
+ // saxParserFactory = SAXParserFactory.newInstance();
+ // saxParserFactory.setNamespaceAware(true);
+ // }
+
+ private final NetconfEXICodec codec;
+
+ public NetconfEXIToMessageDecoder(final NetconfEXICodec codec) {
+ this.codec = Preconditions.checkNotNull(codec);
+ }
+
+ @Override
+ protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
+ /*
+ * Note that we could loop here and process all the messages, but we can't do that.
+ * The reason is <stop-exi> operation, which has the contract of immediately stopping
+ * the use of EXI, which means the next message needs to be decoded not by us, but rather
+ * by the XML decoder.
+ */
+ final DOMResult result = new DOMResult();
+ final EXIReader r = codec.getReader();
+
+ final TransformerHandler transformerHandler = saxTransformerFactory.newTransformerHandler();
+ transformerHandler.setResult(result);
+ r.setContentHandler(transformerHandler);
+
+ try (final InputStream is = new ByteBufInputStream(in)) {
+ r.parse(new InputSource(is));
+ }
+ out.add(new NetconfMessage((Document) result.getNode()));
+ }
+}