Apache CXF example source code file (JsSimpleDomNode.java)

This example Apache CXF source code file (JsSimpleDomNode.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Apache CXF tags/keywords

arraylist, attr, context, dom, instantiationexception, jssimpledomnode, jssimpledomnode, namednodemap, node, node, object, object, reflection, runtimeexception, string, string, util

The Apache CXF JsSimpleDomNode.java source code

/**
 * 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.cxf.javascript;

import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;

import org.w3c.dom.Attr;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

import org.mozilla.javascript.Context;
import org.mozilla.javascript.ContextFactory;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;

/**
 * A Rhino wrapper around org.w3c.dom.Node. Not comprehensive, but enough to test CXF JavaScript.
 */
public class JsSimpleDomNode extends ScriptableObject {
    private Node wrappedNode;
    private boolean childrenWrapped;
    private boolean attributesWrapped;
    private JsSimpleDomNode previousSibling;
    private JsSimpleDomNode nextSibling;
    private List<JsSimpleDomNode> children;
    private JsNamedNodeMap attributes;

    /**
     * Only exists to make Rhino happy. Should never be used.
     */
    public JsSimpleDomNode() {
    }

    public static void register(ScriptableObject scope) {
        try {
            ScriptableObject.defineClass(scope, JsSimpleDomNode.class);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        } catch (InstantiationException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public String getClassName() {
        return "Node";
    }

    public Node getWrappedNode() {
        return wrappedNode;
    }

    // CHECKSTYLE:OFF
    public String jsGet_localName() {
        return wrappedNode.getLocalName();
    }

    public String jsGet_namespaceURI() {
        return wrappedNode.getNamespaceURI();
    }

    public Object jsGet_firstChild() {
        establishChildren();
        if (children.size() > 0)
            return children.get(0);
        else
            return null;
    }

    public Object jsGet_nextSibling() {
        return nextSibling;
    }

    public Object jsGet_previousSibling() {
        return previousSibling;
    }

    public Object jsGet_parentNode() {
        // risk errors in object equality ...
        return wrapNode(this, wrappedNode.getParentNode());
    }

    public int jsGet_nodeType() {
        return wrappedNode.getNodeType();
    }

    public String jsGet_nodeValue() {
        return wrappedNode.getNodeValue();
    }

    public String jsGet_nodeName() {
        return wrappedNode.getNodeName();
    }

    // in a more complete version of this, we'd use a different object type to wrap documents.
    public Object jsGet_documentElement() {
        if (9 /* Document */!= wrappedNode.getNodeType()) {
            return null;
        } else {
            establishChildren();
            return children.get(0); // it is, after all, just a convenience feature.
        }
    }

    public Object[] jsGet_childNodes() {
        establishChildren();
        return children.toArray();
    }

    public Object jsGet_attributes() {
        establishAttributes();
        return attributes;
    }

    public String jsFunction_getAttributeNS(String namespaceURI, String localName) {
        NamedNodeMap attributes = wrappedNode.getAttributes();
        Node attrNode = attributes.getNamedItemNS(namespaceURI, localName);
        if (attrNode == null) {
            return null;
        } else {
            Attr attribute = (Attr)attrNode;
            return attribute.getValue();
        }
    }

    public String jsFunction_getAttribute(String localName) {
        NamedNodeMap attributes = wrappedNode.getAttributes();
        Node attrNode = attributes.getNamedItem(localName);
        if (attrNode == null) {
            return null;
        } else {
            Attr attribute = (Attr)attrNode;
            return attribute.getValue();
        }
    }

    // CHECKSTYLE:ON

    public static JsSimpleDomNode wrapNode(Scriptable scope, Node node) {
        if (node == null) {
            return null;
        }

        Context cx = ContextFactory.getGlobal().enterContext();
        try {
            JsSimpleDomNode newObject = (JsSimpleDomNode)cx.newObject(scope, "Node");
            newObject.initialize(node, null);
            return newObject;
        } finally {
            Context.exit();
        }
    }

    private JsSimpleDomNode newObject(Node node, JsSimpleDomNode prev) {
        Context cx = ContextFactory.getGlobal().enterContext();
        try {
            JsSimpleDomNode newObject = (JsSimpleDomNode)cx.newObject(getParentScope(), "Node");
            newObject.initialize(node, prev);
            return newObject;
        } finally {
            Context.exit();
        }
    }

    private void establishChildren() {
        if (!childrenWrapped) {
            if (wrappedNode.hasChildNodes()) {
                children = new ArrayList<JsSimpleDomNode>();
                Node node = wrappedNode.getFirstChild();
                int x = 0;
                while (node != null) {
                    JsSimpleDomNode prev = null;
                    if (x > 0) {
                        prev = (JsSimpleDomNode)children.get(x - 1);
                    }
                    children.add(x, newObject(node, prev));
                    if (x > 0) {
                        children.get(x - 1).setNext(children.get(x));
                    }
                    node = node.getNextSibling();
                    x++;
                }
            } else {
                children = new ArrayList<JsSimpleDomNode>();
            }
            childrenWrapped = true;
        }
    }

    private void establishAttributes() {
        if (!attributesWrapped) {
            NamedNodeMap nodeAttributes = wrappedNode.getAttributes();
            attributes = JsNamedNodeMap.wrapMap(getParentScope(), nodeAttributes);
            attributesWrapped = true;
        }
    }

    // rhino won't let us use a constructor.
    void initialize(Node node, JsSimpleDomNode prev) {
        wrappedNode = node;
        childrenWrapped = false;
        previousSibling = prev;
    }

    void setNext(JsSimpleDomNode next) {
        nextSibling = next;
    }

}