/*
 * 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.DOMException;
import org.w3c.dom.Node;

/**
 * @xerces.internal  
 * 
 * @author Neil Graham, IBM
 * @version $Id$
 */

public class TextImpl extends DefaultText {

    // Data
    String fData = null;
    SchemaDOM fSchemaDOM = null;
    int fRow;
    int fCol;

    public TextImpl(StringBuffer str, SchemaDOM sDOM, int row, int col) {
        fData = str.toString();
        fSchemaDOM = sDOM;
        fRow = row;
        fCol = col;
        rawname = prefix = localpart = uri = null;
        nodeType = Node.TEXT_NODE;
    }

    //
    // org.w3c.dom.Node methods
    //
    
    public String getNodeName() {
        return "#text";
    }
    
    public Node getParentNode() {
        return fSchemaDOM.relations[fRow][0];
    }

    public Node getPreviousSibling() {
        if (fCol == 1) {
            return null;
        }
        return fSchemaDOM.relations[fRow][fCol-1];
    }


    public Node getNextSibling() {
        if (fCol == fSchemaDOM.relations[fRow].length-1) {
            return null;
        }
        return fSchemaDOM.relations[fRow][fCol+1];
    }

    // CharacterData methods

    /**
     * The character data of the node that implements this interface. The DOM 
     * implementation may not put arbitrary limits on the amount of data 
     * that may be stored in a <code>CharacterData</code> node. However, 
     * implementation limits may mean that the entirety of a node's data may 
     * not fit into a single <code>DOMString</code>. In such cases, the user 
     * may call <code>substringData</code> to retrieve the data in 
     * appropriately sized pieces.
     * @exception DOMException
     *   NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.
     * @exception DOMException
     *   DOMSTRING_SIZE_ERR: Raised when it would return more characters than 
     *   fit in a <code>DOMString</code> variable on the implementation 
     *   platform.
     */
    public String getData()
                            throws DOMException {
        return fData;
    }

    /**
     * The number of 16-bit units that are available through <code>data</code> 
     * and the <code>substringData</code> method below. This may have the 
     * value zero, i.e., <code>CharacterData</code> nodes may be empty.
     */
    public int getLength() {
        if(fData == null) return 0;
        return fData.length();
    }

    /**
     * Extracts a range of data from the node.
     * @param offset Start offset of substring to extract.
     * @param count The number of 16-bit units to extract.
     * @return The specified substring. If the sum of <code>offset</code> and 
     *   <code>count</code> exceeds the <code>length</code>, then all 16-bit 
     *   units to the end of the data are returned.
     * @exception DOMException
     *   INDEX_SIZE_ERR: Raised if the specified <code>offset</code> is 
     *   negative or greater than the number of 16-bit units in 
     *   <code>data</code>, or if the specified <code>count</code> is 
     *   negative.
     *   <br>DOMSTRING_SIZE_ERR: Raised if the specified range of text does 
     *   not fit into a <code>DOMString</code>.
     */
    public String substringData(int offset, 
                                int count)
                                throws DOMException {
        if(fData == null) return null;
        if(count < 0 || offset < 0 || offset > fData.length()) 
    	    throw new DOMException(DOMException.INDEX_SIZE_ERR, "parameter error");
        if(offset+count >= fData.length()) 
            return fData.substring(offset);
        return fData.substring(offset, offset+count);
    }

}
