/*
 * 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.xerces.impl.xs.opti;

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

/**
 * @xerces.internal  
 * 
 * @author Rahul Srivastava, Sun Microsystems Inc.
 * @author Sandy Gao, IBM
 *
 * @version $Id$
 */
public class ElementImpl extends DefaultElement {
    
    SchemaDOM schemaDOM;
    Attr[] attrs;
    int row;
    int col;
    int parentRow;
    
    int line;
    int column;
    int charOffset;
    String fAnnotation;
    String fSyntheticAnnotation;
    
    public ElementImpl(int line, int column, int offset) {
        row = -1;
        col = -1;
        parentRow = -1;
        nodeType = Node.ELEMENT_NODE;
        
        this.line = line;
        this.column = column;
        charOffset = offset;
    }
    
    public ElementImpl(int line, int column) {
        this(line, column, -1);
    }
    
    
    public ElementImpl(String prefix, String localpart, String rawname,
            String uri, int line, int column, int offset) {
        super(prefix, localpart, rawname, uri, Node.ELEMENT_NODE);
        row = -1;
        col = -1;
        parentRow = -1;
        
        this.line = line;
        this.column = column;
        charOffset = offset;
    }
    
    public ElementImpl(String prefix, String localpart, String rawname,
            String uri, int line, int column) {
        this(prefix, localpart, rawname, uri, line, column, -1);
    }
    
    
    //
    // org.w3c.dom.Node methods
    //
    
    public Document getOwnerDocument() {
        return schemaDOM;
    }
    
    
    public Node getParentNode() {
        return schemaDOM.relations[row][0];
    }
    
    
    public boolean hasChildNodes() {
        if (parentRow == -1) {
            return false;
        }
        else {
            return true;
        }
    }
    
    
    public Node getFirstChild() {
        if (parentRow == -1) {
            return null;
        }
        return schemaDOM.relations[parentRow][1];
    }
    
    
    public Node getLastChild() {
        if (parentRow == -1) {
            return null;
        }
        int i=1;
        for (; i<schemaDOM.relations[parentRow].length; i++) {
            if (schemaDOM.relations[parentRow][i] == null) {
                return schemaDOM.relations[parentRow][i-1];
            }
        }
        if (i ==1) {
            i++;
        }
        return schemaDOM.relations[parentRow][i-1];
    }
    
    
    public Node getPreviousSibling() {
        if (col == 1) {
            return null;
        }
        return schemaDOM.relations[row][col-1];
    }
    
    
    public Node getNextSibling() {
        if (col == schemaDOM.relations[row].length-1) {
            return null;
        }
        return schemaDOM.relations[row][col+1];
    }
    
    
    public NamedNodeMap getAttributes() {
        return new NamedNodeMapImpl(attrs);
    }
    
    
    public boolean hasAttributes() {
        return (attrs.length == 0 ? false : true);
    }
    
    
    
    //
    // org.w3c.dom.Element methods
    //
    
    public String getTagName() {
        return rawname;
    }
    
    
    public String getAttribute(String name) {
        
        for (int i=0; i<attrs.length; i++) {
            if (attrs[i].getName().equals(name)) {
                return attrs[i].getValue();
            }
        }
        return "";
    }
    
    
    public Attr getAttributeNode(String name) {
        for (int i=0; i<attrs.length; i++) {
            if (attrs[i].getName().equals(name)) {
                return attrs[i];
            }
        }
        return null;
    }
    
    
    public String getAttributeNS(String namespaceURI, String localName) {
        for (int i=0; i<attrs.length; i++) {
            if (attrs[i].getLocalName().equals(localName) && nsEquals(attrs[i].getNamespaceURI(), namespaceURI)) {
                return attrs[i].getValue();
            }
        }
        return "";
    }
    
    
    public Attr getAttributeNodeNS(String namespaceURI, String localName) {
        for (int i=0; i<attrs.length; i++) {
            if (attrs[i].getName().equals(localName) && nsEquals(attrs[i].getNamespaceURI(), namespaceURI)) {
                return attrs[i];
            }
        }
        return null;
    }
    
    
    public boolean hasAttribute(String name) {
        for (int i=0; i<attrs.length; i++) {
            if (attrs[i].getName().equals(name)) {
                return true;
            }
        }
        return false;
    }
    
    
    public boolean hasAttributeNS(String namespaceURI, String localName) {
        for (int i=0; i<attrs.length; i++) {
            if (attrs[i].getName().equals(localName) && nsEquals(attrs[i].getNamespaceURI(), namespaceURI)) {
                return true;
            }
        }
        return false;
    }
    
    
    public void setAttribute(String name, String value) {
        for (int i=0; i<attrs.length; i++) {
            if (attrs[i].getName().equals(name)) {
                attrs[i].setValue(value);
                return;
            }
        }
    }
    
    /** Returns the line number. */
    public int getLineNumber() {
        return line;
    }
    
    /** Returns the column number. */
    public int getColumnNumber() {
        return column;
    }
    
    /** Returns the character offset. */
    public int getCharacterOffset() {
        return charOffset;
    }
    
    public String getAnnotation() {
        return fAnnotation;
    }
    
    public String getSyntheticAnnotation() {
        return fSyntheticAnnotation;
    }
    
    /**
     * Compares two namespace URIs with an extra case for null entries
     */
    private static boolean nsEquals(String nsURI_1, String nsURI_2) {
        if (nsURI_1 == null) {
            return (nsURI_2 == null);
        }
        else {
            return nsURI_1.equals(nsURI_2);
        }
    }
    
}
