added filter to add the correct Maven namespace to the POM if it is missing

Former-commit-id: 79efc8a8a876831739874914a97ba2d764dd6a7a

src/main/java/org/owasp/dependencycheck/analyzer/pom/MavenNamespaceFilter.java

@@ -0,0 +1,79 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.owasp.dependencycheck.analyzer.pom;
+
+import org.xml.sax.Attributes;
+import org.xml.sax.SAXException;
+import org.xml.sax.helpers.XMLFilterImpl;
+
+/**
+ * This filter is used when parsing POM documents. Some POM documents
+ * do not specify the xmlns="http://maven.apache.org/POM/4.0.0". This
+ * filter ensures that the correct namespace is added so that both
+ * types of POMs can be read.
+ * @author Jeremy Long (jeremy.long@gmail.com)
+ */
+public class MavenNamespaceFilter extends XMLFilterImpl {
+
+    /**
+     * The namespace to add for Maven POMs.
+     */
+    private static final String NAMESPACE = "http://maven.apache.org/POM/4.0.0";
+    /**
+     * A flag indicating whether or not the namespace (prefix) has been added.
+     */
+    private boolean namespaceAdded = false;
+
+    /**
+     * Called at the start of the document parsing.
+     * @throws SAXException thrown if there is a SAXException
+     */
+    @Override
+    public void startDocument() throws SAXException {
+        super.startDocument();
+        startPrefixMapping("", NAMESPACE);
+    }
+
+    /**
+     * Called when an element is started.
+     * @param uri the uri
+     * @param localName the localName
+     * @param qName the qualified name
+     * @param atts the attributes
+     * @throws SAXException thrown if there is a SAXException
+     */
+    @Override
+    public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
+        super.startElement(NAMESPACE, localName, qName, atts);
+    }
+
+    /**
+     * Indicatees the start of the document.
+     * @param uri the uri
+     * @param localName the localName
+     * @param qName the qualified name
+     * @throws SAXException thrown if there is a SAXException
+     */
+    @Override
+    public void endElement(String uri, String localName, String qName)
+            throws SAXException {
+        super.endElement(NAMESPACE, localName, qName);
+    }
+
+    /**
+     * Called when prefix mapping
+     * @param prefix the prefix
+     * @param url the url
+     * @throws SAXException thrown if there is a SAXException
+     */
+    @Override
+    public void startPrefixMapping(String prefix, String url) throws SAXException {
+        if (!this.namespaceAdded) {
+            namespaceAdded = true;
+            super.startPrefixMapping("", NAMESPACE);
+        }
+    }
+
+}