/*
 * 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.
 */
/*
 * $Id$
 */


package org.apache.xpath.domapi;

import org.w3c.dom.Attr;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.xpath.XPathNamespace;

import org.w3c.dom.UserDataHandler;

/**
 * 
 * 
 * The <code>XPathNamespace</code> interface is returned by 
 * <code>XPathResult</code> interfaces to represent the XPath namespace node 
 * type that DOM lacks. There is no public constructor for this node type. 
 * Attempts to place it into a hierarchy or a NamedNodeMap result in a 
 * <code>DOMException</code> with the code <code>HIERARCHY_REQUEST_ERR</code>
 * . This node is read only, so methods or setting of attributes that would 
 * mutate the node result in a DOMException with the code 
 * <code>NO_MODIFICATION_ALLOWED_ERR</code>.
 * <p>The core specification describes attributes of the <code>Node</code> 
 * interface that are different for different node node types but does not 
 * describe <code>XPATH_NAMESPACE_NODE</code>, so here is a description of 
 * those attributes for this node type. All attributes of <code>Node</code> 
 * not described in this section have a <code>null</code> or 
 * <code>false</code> value.
 * <p><code>ownerDocument</code> matches the <code>ownerDocument</code> of the 
 * <code>ownerElement</code> even if the element is later adopted.
 * <p><code>prefix</code> is the prefix of the namespace represented by the 
 * node.
 * <p><code>nodeName</code> is the same as <code>prefix</code>.
 * <p><code>nodeType</code> is equal to <code>XPATH_NAMESPACE_NODE</code>.
 * <p><code>namespaceURI</code> is the namespace URI of the namespace 
 * represented by the node.
 * <p><code>adoptNode</code>, <code>cloneNode</code>, and 
 * <code>importNode</code> fail on this node type by raising a 
 * <code>DOMException</code> with the code <code>NOT_SUPPORTED_ERR</code>.In 
 * future versions of the XPath specification, the definition of a namespace 
 * node may be changed incomatibly, in which case incompatible changes to 
 * field values may be required to implement versions beyond XPath 1.0.
 * <p>See also the <a href='http://www.w3.org/TR/2004/NOTE-DOM-Level-3-XPath-20040226'>Document Object Model (DOM) Level 3 XPath Specification</a>.
 * 
 * This implementation wraps the DOM attribute node that contained the 
 * namespace declaration.
 * @xsl.usage internal
 */

class XPathNamespaceImpl implements XPathNamespace {

    // Node that XPathNamespaceImpl wraps
    final private Node m_attributeNode;
    
    /**
     * Constructor for XPathNamespaceImpl.
     */
    XPathNamespaceImpl(Node node) {
        m_attributeNode = node;
    }

    /**
     * @see org.apache.xalan.dom3.xpath.XPathNamespace#getOwnerElement()
     */
    public Element getOwnerElement() {
        return ((Attr)m_attributeNode).getOwnerElement(); 
    }

    /**
     * @see org.w3c.dom.Node#getNodeName()
     */
    public String getNodeName() {
        return "#namespace";
    }

    /**
     * @see org.w3c.dom.Node#getNodeValue()
     */
    public String getNodeValue() throws DOMException {
        return m_attributeNode.getNodeValue();
    }

    /**
     * @see org.w3c.dom.Node#setNodeValue(String)
     */
    public void setNodeValue(String arg0) throws DOMException {
    }

    /**
     * @see org.w3c.dom.Node#getNodeType()
     */
    public short getNodeType() {
        return XPathNamespace.XPATH_NAMESPACE_NODE;
    }

    /**
     * @see org.w3c.dom.Node#getParentNode()
     */
    public Node getParentNode() {
        return m_attributeNode.getParentNode();
    }

    /**
     * @see org.w3c.dom.Node#getChildNodes()
     */
    public NodeList getChildNodes() {
        return m_attributeNode.getChildNodes();
    }

    /**
     * @see org.w3c.dom.Node#getFirstChild()
     */
    public Node getFirstChild() {
        return m_attributeNode.getFirstChild();
    }

    /**
     * @see org.w3c.dom.Node#getLastChild()
     */
    public Node getLastChild() {
        return m_attributeNode.getLastChild();
    }

    /**
     * @see org.w3c.dom.Node#getPreviousSibling()
     */
    public Node getPreviousSibling() {
        return m_attributeNode.getPreviousSibling();
    }

    /**
     * @see org.w3c.dom.Node#getNextSibling()
     */
    public Node getNextSibling() {
        return m_attributeNode.getNextSibling();
    }

    /**
     * @see org.w3c.dom.Node#getAttributes()
     */
    public NamedNodeMap getAttributes() {
        return m_attributeNode.getAttributes();
    }

    /**
     * @see org.w3c.dom.Node#getOwnerDocument()
     */
    public Document getOwnerDocument() {
        return m_attributeNode.getOwnerDocument();
    }

    /**
     * @see org.w3c.dom.Node#insertBefore(Node, Node)
     */
    public Node insertBefore(Node arg0, Node arg1) throws DOMException {
        return null;
    }

    /**
     * @see org.w3c.dom.Node#replaceChild(Node, Node)
     */
    public Node replaceChild(Node arg0, Node arg1) throws DOMException {
        return null;
    }

    /**
     * @see org.w3c.dom.Node#removeChild(Node)
     */
    public Node removeChild(Node arg0) throws DOMException {
        return null;
    }

    /**
     * @see org.w3c.dom.Node#appendChild(Node)
     */
    public Node appendChild(Node arg0) throws DOMException {
        return null;
    }

    /**
     * @see org.w3c.dom.Node#hasChildNodes()
     */
    public boolean hasChildNodes() {
        return false;
    }

    /**
     * @see org.w3c.dom.Node#cloneNode(boolean)
     */
    public Node cloneNode(boolean arg0) {
        throw new DOMException(DOMException.NOT_SUPPORTED_ERR,null);
    }

    /**
     * @see org.w3c.dom.Node#normalize()
     */
    public void normalize() {
        m_attributeNode.normalize();
    }

    /**
     * @see org.w3c.dom.Node#isSupported(String, String)
     */
    public boolean isSupported(String arg0, String arg1) {
        return m_attributeNode.isSupported(arg0, arg1);
    }

    /**
     * @see org.w3c.dom.Node#getNamespaceURI()
     */
    public String getNamespaceURI() {
        
        // For namespace node, the namespaceURI is the namespace URI
        // of the namespace represented by the node.
        return m_attributeNode.getNodeValue();
    }

    /**
     * @see org.w3c.dom.Node#getPrefix()
     */
    public String getPrefix() {
        return m_attributeNode.getPrefix();
    }

    /**
     * @see org.w3c.dom.Node#setPrefix(String)
     */
    public void setPrefix(String arg0) throws DOMException {
    }

    /**
     * @see org.w3c.dom.Node#getLocalName()
     */
    public String getLocalName() {
        
        // For namespace node, the local name is the same as the prefix
        return m_attributeNode.getPrefix();
    }

    /**
     * @see org.w3c.dom.Node#hasAttributes()
     */
    public boolean hasAttributes() {
        return m_attributeNode.hasAttributes();
    }

    public String getBaseURI ( ) {
        return null;
    }

    public short compareDocumentPosition(Node other) throws DOMException {
        return 0;
    }

    private String textContent;
    
    public String getTextContent() throws DOMException {
        return textContent;
    }
    
    public void setTextContent(String textContent) throws DOMException {
        this.textContent = textContent;
    }
    
    public boolean isSameNode(Node other) {
        return false;
    }

    public String lookupPrefix(String namespaceURI) {
        return ""; //PENDING
    }

    public boolean isDefaultNamespace(String namespaceURI) {
        return false;
    }

    public String lookupNamespaceURI(String prefix) {
        return null;
    }

    public boolean isEqualNode(Node arg) {
        return false;
    }

    public Object getFeature(String feature, String version) {
        return null; //PENDING
    }

    public Object setUserData(String key, 
                              Object data, 
                              UserDataHandler handler) {
        return null; //PENDING
    }

    public Object getUserData(String key) {
        return null;
    } 
}