/*
 * $Id$
 *
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2000 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Crimson" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, Sun Microsystems, Inc., 
 * http://www.sun.com.  For more information on the Apache Software 
 * Foundation, please see <http://www.apache.org/>.
 */

package org.apache.xerces.tree;


import java.io.Writer;
import java.io.IOException;

import org.w3c.dom.*;


/**
 * Class representing an XML Comment.
 *
 * @author David Brownell
 * @version $Revision$
 */
// public
class CommentNode extends DataNode implements Comment
{
    /** Constructs a comment node. */
    public CommentNode () { }

    /** Constructs a comment node. */
    public CommentNode (String data)
    {
        super (data);
    }

    CommentNode (char buf [], int offset, int len)
	{ super (buf, offset, len); }
    
    /** DOM:  Returns the COMMENT_NODE node type. */
    public short getNodeType () { return COMMENT_NODE; }


    /**
     * Writes out the comment.  Note that spaces may be added to
     * prevent illegal comments:  between consecutive dashes ("--")
     * or if the last character of the comment is a dash.
     */
    public void writeXml (XmlWriteContext context) throws IOException
    {
	Writer	out = context.getWriter ();
        out.write ("<!--");
        if (data != null) {
	    boolean	sawDash = false;
	    int		length = data.length;

	    // "--" illegal in comments, expand it
	    for (int i = 0; i < length; i++) {
		if (data [i] == '-') {
		    if (sawDash)
			out.write (' ');
		    else {
			sawDash = true;
			out.write ('-');
			continue;
		    }
		}
		sawDash = false;
		out.write (data [i]);
	    }
	    if (data [data.length - 1] == '-')
		out.write (' ');
	}
        out.write ("-->");
    }

    /** Returns a new comment with the same content as this. */
    public Node cloneNode (boolean deep) { 
    	CommentNode retval = new CommentNode (data, 0, data.length); 
	retval.setOwnerDocument ((XmlDocument) this.getOwnerDocument ());
    	return retval;
    }

    /** Returns the string "#comment". */
    public String getNodeName () { return "#comment"; }
}