Struts example source code file (ProxyElementAdapter.java)

This example Struts source code file (ProxyElementAdapter.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 - Struts tags/keywords

attr, attr, dom, domexception, domexception, element, list, node, nodelist, proxyelementadapter, string, string, typeinfo, unsupportedoperationexception, unsupportedoperationexception, util

The Struts ProxyElementAdapter.java source code

/*
 * $Id: ProxyElementAdapter.java 651946 2008-04-27 13:41:38Z apetrelli $
 *
 * 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.struts2.views.xslt;

import java.util.ArrayList;
import java.util.List;

import org.w3c.dom.Attr;
import org.w3c.dom.DOMException;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.TypeInfo;

import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;

/**
 * ProxyElementAdapter is a pass-through adapter for objects which already
 * implement the Element interface.  All methods are proxied to the underlying
 * Node except getParent(), getNextSibling() and getPreviousSibling(), which
 * are implemented by the abstract adapter node to work with the parent adapter.
 *
 * Note: this class wants to be (extend) both an AbstractElementAdapter
 * and ProxyElementAdapter, but its proxy-ness is winning right now.
 */
public class ProxyElementAdapter extends ProxyNodeAdapter implements Element {

    private Logger log = LoggerFactory.getLogger(this.getClass());

    public ProxyElementAdapter(AdapterFactory factory, AdapterNode parent, Element value) {
        super(factory, parent, value);
    }

    /**
     * Get the proxied Element
     */
    protected Element element() {
        return (Element) getPropertyValue();
    }

    protected List<Node> buildChildAdapters() {
        List<Node> adapters = new ArrayList();
        NodeList children = node().getChildNodes();
        for (int i = 0; i < children.getLength(); i++) {
            Node child = children.item(i);
            Node adapter = wrap(child);
            if (adapter != null) {
                log.debug("wrapped child node: " + child.getNodeName());
                adapters.add(adapter);
            }
        }
        return adapters;
    }

    // Proxied Element methods

    public String getTagName() {
        return element().getTagName();
    }

    public boolean hasAttribute(String name) {
        return element().hasAttribute(name);
    }

    public String getAttribute(String name) {
        return element().getAttribute(name);
    }

    public boolean hasAttributeNS(String namespaceURI, String localName) {
        return element().hasAttributeNS(namespaceURI, localName);
    }

    public Attr getAttributeNode(String name) {
        log.debug("wrapping attribute");
        return (Attr) wrap(element().getAttributeNode(name));
    }

    // I'm overriding this just for clarity.  The base impl is correct.
    public NodeList getElementsByTagName(String name) {
        return super.getElementsByTagName(name);
    }

    public String getAttributeNS(String namespaceURI, String localName) {
        return element().getAttributeNS(namespaceURI, localName);
    }

    public Attr getAttributeNodeNS(String namespaceURI, String localName) {
        return (Attr) wrap(element().getAttributeNodeNS(namespaceURI, localName));
    }

    public NodeList getElementsByTagNameNS(String namespaceURI, String localName) {
        return super.getElementsByTagNameNS(namespaceURI, localName);
    }

    // Unsupported mutators of Element

    public void removeAttribute(String name) throws DOMException {
        throw new UnsupportedOperationException();
    }

    public void removeAttributeNS(String namespaceURI, String localName) throws DOMException {
        throw new UnsupportedOperationException();
    }

    public void setAttribute(String name, String value) throws DOMException {
        throw new UnsupportedOperationException();
    }

    public Attr removeAttributeNode(Attr oldAttr) throws DOMException {
        throw new UnsupportedOperationException();
    }

    public Attr setAttributeNode(Attr newAttr) throws DOMException {
        throw new UnsupportedOperationException();
    }

    public Attr setAttributeNodeNS(Attr newAttr) throws DOMException {
        throw new UnsupportedOperationException();
    }

    public void setAttributeNS(String namespaceURI, String qualifiedName, String value) throws DOMException {
        throw new UnsupportedOperationException();
    }

    // end proxied Element methods

    // unsupported DOM level 3 methods

    public TypeInfo getSchemaTypeInfo() {
        throw operationNotSupported();
    }

    public void setIdAttribute(String string, boolean b) throws DOMException {
        throw operationNotSupported();
    }

    public void setIdAttributeNS(String string, String string1, boolean b) throws DOMException {
        throw operationNotSupported();
    }

    public void setIdAttributeNode(Attr attr, boolean b) throws DOMException {
        throw operationNotSupported();
    }

    // end DOM level 3 methods

    public String toString() {
        return "ProxyElement for: " + element();
    }
}