--- /dev/null
+/*
+ * 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.netconf.nettyutil.handler;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Optional;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufOutputStream;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.MessageToByteEncoder;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.nio.charset.StandardCharsets;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+import org.opendaylight.netconf.api.NetconfMessage;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.w3c.dom.Comment;
+
+public class NetconfMessageToXMLEncoder extends MessageToByteEncoder<NetconfMessage> {
+ private static final Logger LOG = LoggerFactory.getLogger(NetconfMessageToXMLEncoder.class);
+
+ private final Optional<String> clientId;
+
+ public NetconfMessageToXMLEncoder() {
+ this(Optional.<String>absent());
+ }
+
+ public NetconfMessageToXMLEncoder(final Optional<String> clientId) {
+ this.clientId = clientId;
+ }
+
+ @Override
+ @VisibleForTesting
+ public void encode(final ChannelHandlerContext ctx, final NetconfMessage msg, final ByteBuf out)
+ throws IOException, TransformerException {
+ LOG.trace("Sent to encode : {}", msg);
+
+ if (clientId.isPresent()) {
+ Comment comment = msg.getDocument().createComment("clientId:" + clientId.get());
+ msg.getDocument().appendChild(comment);
+ }
+
+ try (OutputStream os = new ByteBufOutputStream(out)) {
+ // Wrap OutputStreamWriter with BufferedWriter as suggested in javadoc for OutputStreamWriter
+
+ // Using custom BufferedWriter that does not provide newLine method as performance improvement
+ // see javadoc for BufferedWriter
+ StreamResult result =
+ new StreamResult(new BufferedWriter(new OutputStreamWriter(os, StandardCharsets.UTF_8)));
+ DOMSource source = new DOMSource(msg.getDocument());
+ ThreadLocalTransformers.getPrettyTransformer().transform(source, result);
+ }
+ }
+}