Implementation for enabling remote rpc calls between 2 instances of md-sal

[controller.git] / opendaylight / md-sal / sal-remoterpc-connector / implementation / src / main / java / org / opendaylight / controller / sal / connector / remoterpc / util / XmlUtils.java

diff --git a/opendaylight/md-sal/sal-remoterpc-connector/implementation/src/main/java/org/opendaylight/controller/sal/connector/remoterpc/util/XmlUtils.java b/opendaylight/md-sal/sal-remoterpc-connector/implementation/src/main/java/org/opendaylight/controller/sal/connector/remoterpc/util/XmlUtils.java
new file mode 100644 (file)
index 0000000..7dab2e3
--- /dev/null
+++ b/opendaylight/md-sal/sal-remoterpc-connector/implementation/src/main/java/org/opendaylight/controller/sal/connector/remoterpc/util/XmlUtils.java
@@ -0,0 +1,63 @@
+package org.opendaylight.controller.sal.connector.remoterpc.util;
+
+import org.opendaylight.yangtools.yang.data.api.CompositeNode;
+import org.opendaylight.yangtools.yang.data.api.Node;
+import org.opendaylight.yangtools.yang.data.api.SimpleNode;
+import org.opendaylight.yangtools.yang.data.impl.NodeUtils;
+import org.opendaylight.yangtools.yang.data.impl.XmlTreeBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.w3c.dom.Document;
+
+import javax.xml.stream.XMLStreamException;
+import javax.xml.transform.OutputKeys;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+import java.io.ByteArrayInputStream;
+import java.io.StringWriter;
+
+public class XmlUtils {
+
+  private static final Logger _logger = LoggerFactory.getLogger(XmlUtils.class);
+
+  public static String compositeNodeToXml(CompositeNode cNode){
+    if (cNode == null) return new String();
+
+    Document domTree = NodeUtils.buildShadowDomTree(cNode);
+    StringWriter writer = new StringWriter();
+    try {
+      TransformerFactory tf = TransformerFactory.newInstance();
+      Transformer transformer = tf.newTransformer();
+      transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
+      transformer.transform(new DOMSource(domTree), new StreamResult(writer));
+    } catch (TransformerException e) {
+      _logger.error("Error during translation of Document to OutputStream", e);
+    }
+
+    return writer.toString();
+  }
+
+  public static CompositeNode xmlToCompositeNode(String xml){
+    if (xml==null || xml.length()==0) return null;
+
+    Node<?> dataTree;
+    try {
+      dataTree = XmlTreeBuilder.buildDataTree(new ByteArrayInputStream(xml.getBytes()));
+    } catch (XMLStreamException e) {
+      _logger.error("Error during building data tree from XML", e);
+      return null;
+    }
+    if (dataTree == null) {
+      _logger.error("data tree is null");
+      return null;
+    }
+    if (dataTree instanceof SimpleNode) {
+      _logger.error("RPC XML was resolved as SimpleNode");
+      return null;
+    }
+    return (CompositeNode) dataTree;
+  }
+}