Optimized the getChildNodes method. This also fixes an issue when that method is used on an Attr instance.

diff --git a/modules/axiom-dom-testsuite/src/main/java/org/apache/axiom/ts/dom/DOMTestSuiteBuilder.java b/modules/axiom-dom-testsuite/src/main/java/org/apache/axiom/ts/dom/DOMTestSuiteBuilder.java
index 780dc29..65ce085 100644
--- a/modules/axiom-dom-testsuite/src/main/java/org/apache/axiom/ts/dom/DOMTestSuiteBuilder.java
+++ b/modules/axiom-dom-testsuite/src/main/java/org/apache/axiom/ts/dom/DOMTestSuiteBuilder.java
@@ -30,6 +30,7 @@
     }
     
     protected void addTests() {
+        addTest(new org.apache.axiom.ts.dom.attr.TestGetChildNodes(dbf));
         addTest(new org.apache.axiom.ts.dom.attr.TestGetFirstChild(dbf));
         addTest(new org.apache.axiom.ts.dom.attr.TestGetValueWithMultipleChildren(dbf));
         addTest(new org.apache.axiom.ts.dom.attr.TestSetPrefixNotNullWithNamespace(dbf));
diff --git a/modules/axiom-dom-testsuite/src/main/java/org/apache/axiom/ts/dom/attr/TestGetChildNodes.java b/modules/axiom-dom-testsuite/src/main/java/org/apache/axiom/ts/dom/attr/TestGetChildNodes.java
new file mode 100644
index 0000000..b3edffc
--- /dev/null
+++ b/modules/axiom-dom-testsuite/src/main/java/org/apache/axiom/ts/dom/attr/TestGetChildNodes.java
@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.axiom.ts.dom.attr;
+
+import javax.xml.parsers.DocumentBuilderFactory;
+
+import org.apache.axiom.ts.dom.DOMTestCase;
+import org.w3c.dom.Attr;
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.w3c.dom.Text;
+
+public class TestGetChildNodes extends DOMTestCase {
+    public TestGetChildNodes(DocumentBuilderFactory dbf) {
+        super(dbf);
+    }
+
+    protected void runTest() throws Throwable {
+        Document document = dbf.newDocumentBuilder().newDocument();
+        Attr attr = document.createAttributeNS(null, "name");
+        attr.setValue("value");
+        NodeList children = attr.getChildNodes();
+        assertEquals(1, children.getLength());
+        Node child = children.item(0);
+        assertTrue(child instanceof Text);
+        assertEquals("value", ((Text)child).getData());
+    }
+}
diff --git a/modules/axiom-dom/src/main/java/org/apache/axiom/om/impl/dom/ParentNode.java b/modules/axiom-dom/src/main/java/org/apache/axiom/om/impl/dom/ParentNode.java
index 9ba8f23..7d922d7 100644
--- a/modules/axiom-dom/src/main/java/org/apache/axiom/om/impl/dom/ParentNode.java
+++ b/modules/axiom-dom/src/main/java/org/apache/axiom/om/impl/dom/ParentNode.java
@@ -53,7 +53,7 @@
 
 import java.util.Iterator;
 
-public abstract class ParentNode extends NodeImpl {
+public abstract class ParentNode extends NodeImpl implements NodeList {
 
     protected NodeImpl firstChild;
 
@@ -176,15 +176,32 @@
     // /DOM Node methods
     // /
 
-    public NodeList getChildNodes() {
-        if (!this.done) {
-            this.build();
+    public final NodeList getChildNodes() {
+        return this;
+    }
+
+    public final int getLength() {
+        int count = 0;
+        Node child = getFirstChild();
+        while (child != null) {
+            count++;
+            child = child.getNextSibling();
         }
-        return new NodeListImpl() {
-            protected Iterator getIterator() {
-                return getChildren();
+        return count;
+    }
+
+    public final Node item(int index) {
+        int count = 0;
+        Node child = getFirstChild();
+        while (child != null) {
+            if (count == index) {
+                return child;
+            } else {
+                child = child.getNextSibling();
             }
-        };
+            count++;
+        }
+        return null;
     }
 
     public Node getFirstChild() {