characterdataimpl.java

数据仓库工具

/*
    Copyright (C) 2003  Together

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

package org.enhydra.xml;

import org.w3c.dom.DOMException;
import org.w3c.dom.Node;
import org.w3c.dom.CharacterData;

/**
 * @author Tweety
 *
 * A class representing a node in a meta-data tree, which implements
 * the <a href="../../../../api/org/w3c/dom/CharacterData.html">
 *
 * @version 1.0
 */
public class CharacterDataImpl extends NodeImpl implements CharacterData {


	/**
	 * Constructs an empty <code>CharacterDataImpl</code>.
	 */
	public CharacterDataImpl() {
	}

	/**
	 * Constructs a <code>CharacterDataImpl</code> from the
	 * given node as <code>Node</code>.
	 *
	 * @param node , as a <code>Node</code>.
	 */
	public CharacterDataImpl(Node node) {
		super(node);
	}


	/**
	 * Returns node value.
	 *
	 * @return node value, as <code>String</code>.
	 *
	 * @see org.w3c.dom.CharacterData#getData().
         * @throws DOMException
	 */
	public String getData() throws DOMException {
		return nodeValue;
	}

	/**
	 * Sets the new value of this node.
	 *
	 * @param data the new data
	 *
	 * @see org.w3c.dom.CharacterData#setData(String).
         * @throws DOMException
	 */
	public void setData(String data) throws DOMException {
		nodeValue = data;
	}


	/**
	 * Returns the substring from the node's value.
	 *
	 * @param offset the begin index of the substring.
	 * @param count the number of characters.
	 *
	 * @return substring of the node's value.
	 *
	 * @see org.w3c.dom.CharacterData#substringData(int, int).
         * @throws DOMException
	 */
	public String substringData(int offset, int count) throws DOMException {
		int length = nodeValue.length();
        if (count < 0 || offset < 0 || offset > length - 1)
            throw new DOMException(DOMException.INDEX_SIZE_ERR, "Index out of bounds");

        int tailIndex = length;
        if(offset + count < length)
        	tailIndex = offset + count;
        return nodeValue.substring(offset, tailIndex);
	}


	/**
	 * Appends data to the node's value.
	 *
	 * @param arg the data to append to the node's value.
	 *
	 * @see org.w3c.dom.CharacterData#appendData(String).
	 */
	public void appendData(String arg) {
		nodeValue += arg;
	}


	/**
	 * Inserts substring into node's value string.
	 *
	 * @param offset the begin index of the substring.
	 * @param arg the <code>String</code> to insert.
	 *
	 * @see org.w3c.dom.CharacterData#insertData(int, String).
         * @throws DOMException
	 */
	public void insertData(int offset, String arg) throws DOMException {
		try {
			nodeValue = new StringBuffer(nodeValue).insert(offset, arg).toString();
		} catch (StringIndexOutOfBoundsException e) {
			throw new DOMException(DOMException.INDEX_SIZE_ERR, "Index out of bounds");
		}
	}


	/**
	 * Deletes characters from the node's value string.
	 *
	 * @param offset the begin index of the substring.
	 * @param count the number of characters.
	 *
	 * @see org.w3c.dom.CharacterData#deleteData(int, int).
         * @throws DOMException
	 */
	public void deleteData(int offset, int count) throws DOMException {
		int tailLength = nodeValue.length() - count - offset;
		if(nodeValue.length() - count - offset < 0)
			tailLength = 0;
        try {
            nodeValue = nodeValue.substring(0, offset) +
                (tailLength > 0 ? nodeValue.substring(offset + count, offset + count + tailLength) : "");
        } catch (StringIndexOutOfBoundsException e) {
        	throw new DOMException(DOMException.INDEX_SIZE_ERR, "Index out of bounds");
        }
	}


	/**
	 * Replaces characters in the node's value string.
	 *
	 * @param offset the begin index of the substring.
	 * @param count the number of characters.
	 * @param arg the <code>String</code> to insert.
	 *
	 * @see org.w3c.dom.CharacterData#replaceData(int, int, String).
         * @throws DOMException
	 */
	public void replaceData(int offset, int count, String arg) throws DOMException {
		deleteData(offset, count);
        insertData(offset, arg);
	}


	/**
	 * Returns the namespace of the node.
	 *
	 * @return the namespace of the node.
	 *
	 * @see org.w3c.dom.Node#getNamespaceURI().
	 */
	public String getNamespaceURI() {
		return super.getNamespaceURI();
	}


}