/*******************************************************************************
 * Copyright (c) 2001, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.sse.core.internal.encoding.util;

import java.io.IOException;
import java.io.InputStream;


public class NullInputStream extends InputStream {

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.io.InputStream#mark(int)
	 */
	public synchronized void mark(int readlimit) {
		// nothing to do
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.io.InputStream#markSupported()
	 */
	public boolean markSupported() {
		// we can mark nothing.
		// and, we are using this Null class specifically for
		// a "fake" resettable stream.
		return true;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.io.InputStream#read()
	 */
	public int read() throws IOException {

		return -1;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.io.InputStream#reset()
	 */
	public synchronized void reset() throws IOException {
		// nothing to do
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.io.InputStream#skip(long)
	 */
	public long skip(long n) throws IOException {
		return 0;
	}
}