X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;f=opendaylight%2Fnetconf%2Fnetconf-util%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fnetconf%2Futil%2Fxml%2FXmlUtil.java;h=238249dbbd8d49086b38c1696cb6d0cb685909fe;hb=13a76258537f64367e3036925a0331522a571705;hp=137e215a31eb13423b6438671faed529a2fc7ce3;hpb=065ef4acddbae75329e75562c533120d2d615efe;p=controller.git

diff --git a/opendaylight/netconf/netconf-util/src/main/java/org/opendaylight/controller/netconf/util/xml/XmlUtil.java b/opendaylight/netconf/netconf-util/src/main/java/org/opendaylight/controller/netconf/util/xml/XmlUtil.java
index 137e215a31..238249dbbd 100644
--- a/opendaylight/netconf/netconf-util/src/main/java/org/opendaylight/controller/netconf/util/xml/XmlUtil.java
+++ b/opendaylight/netconf/netconf-util/src/main/java/org/opendaylight/controller/netconf/util/xml/XmlUtil.java
@@ -41,9 +41,21 @@ import org.xml.sax.SAXException;
 
 import com.google.common.base.Charsets;
 
-public class XmlUtil {
+public final class XmlUtil {
 
     public static final String XMLNS_ATTRIBUTE_KEY = "xmlns";
+    private static final DocumentBuilderFactory BUILDERFACTORY;
+
+    static {
+        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
+        factory.setNamespaceAware(true);
+        factory.setCoalescing(true);
+        factory.setIgnoringElementContentWhitespace(true);
+        factory.setIgnoringComments(true);
+        BUILDERFACTORY = factory;
+    }
+
+    private XmlUtil() {}
 
     public static Element readXmlToElement(String xmlContent) throws SAXException, IOException {
         Document doc = readXmlToDocument(xmlContent);
@@ -59,13 +71,15 @@ public class XmlUtil {
         return readXmlToDocument(new ByteArrayInputStream(xmlContent.getBytes(Charsets.UTF_8)));
     }
 
+    // TODO improve exceptions throwing
+    // along with XmlElement
+
     public static Document readXmlToDocument(InputStream xmlContent) throws SAXException, IOException {
-        DocumentBuilderFactory factory = getDocumentBuilderFactory();
         DocumentBuilder dBuilder;
         try {
-            dBuilder = factory.newDocumentBuilder();
+            dBuilder = BUILDERFACTORY.newDocumentBuilder();
         } catch (ParserConfigurationException e) {
-            throw new RuntimeException(e);
+            throw new RuntimeException("Failed to parse XML document", e);
         }
         Document doc = dBuilder.parse(xmlContent);
 
@@ -77,23 +91,13 @@ public class XmlUtil {
         return readXmlToDocument(new FileInputStream(xmlFile)).getDocumentElement();
     }
 
-    private static final DocumentBuilderFactory getDocumentBuilderFactory() {
-        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
-        factory.setNamespaceAware(true);
-        factory.setCoalescing(true);
-        factory.setIgnoringElementContentWhitespace(true);
-        factory.setIgnoringComments(true);
-        return factory;
-    }
-
     public static Document newDocument() {
-        DocumentBuilderFactory factory = getDocumentBuilderFactory();
         try {
-            DocumentBuilder builder = factory.newDocumentBuilder();
+            DocumentBuilder builder = BUILDERFACTORY.newDocumentBuilder();
             Document document = builder.newDocument();
             return document;
         } catch (ParserConfigurationException e) {
-            throw new RuntimeException(e);
+            throw new RuntimeException("Failed to create document", e);
         }
     }
 
@@ -135,14 +139,13 @@ public class XmlUtil {
         try {
             Transformer transformer = TransformerFactory.newInstance().newTransformer();
             transformer.setOutputProperty(OutputKeys.INDENT, "yes");
-            transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, addXmlDeclaration == true ? "no" : "yes");
+            transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, addXmlDeclaration ? "no" : "yes");
 
             StreamResult result = new StreamResult(new StringWriter());
             DOMSource source = new DOMSource(xml);
             transformer.transform(source, result);
 
-            String xmlString = result.getWriter().toString();
-            return xmlString;
+            return result.getWriter().toString();
         } catch (IllegalArgumentException | TransformerFactoryConfigurationError | TransformerException e) {
             throw new RuntimeException("Unable to serialize xml element " + xml, e);
         }