/*
 *  This file is part of the Haven & Hearth game client.
 *  Copyright (C) 2009 Fredrik Tolf <fredrik@dolda2000.com>, and
 *                     Björn Johannessen <johannessen.bjorn@gmail.com>
 *
 *  Redistribution and/or modification of this file is subject to the
 *  terms of the GNU Lesser General Public License, version 3, as
 *  published by the Free Software Foundation.
 *
 *  This program 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 General Public License for more details.
 *
 *  Other parts of this source tree adhere to other copying
 *  rights. Please see the file `COPYING' in the root directory of the
 *  source tree for details.
 *
 *  A copy the GNU Lesser General Public License is distributed along
 *  with the source tree of which this file is a part in the file
 *  `doc/LPGL-3'. If it is missing for any reason, please see the Free
 *  Software Foundation's website at <http://www.fsf.org/>, or write
 *  to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 *  Boston, MA 02111-1307 USA
 */

package haven;

import java.io.*;

public class PeekReader extends Reader {
    private final Reader back;
    private boolean p = false;
    private int la;
	
    public PeekReader(Reader back) {
	this.back = back;
    }
	
    public void close() throws IOException {
	back.close();
    }
	
    public int read() throws IOException {
	if(p) {
	    p = false;
	    return(la);
	} else {
	    return(back.read());
	}
    }
	
    public int read(char[] b, int off, int len) throws IOException {
	int r = 0;
	while(r < len) {
	    int c = read();
	    if(c < 0)
		return(r);
	    b[off + r++] = (char)c;
	}
	return(r);
    }
	
    public boolean ready() throws IOException {
	if(p)
	    return(true);
	return(back.ready());
    }
    
    protected boolean whitespace(char c) {
	return(Character.isWhitespace(c));
    }

    public int peek(boolean skipws) throws IOException {
	while(!p || (skipws && (la >= 0) && whitespace((char)la))) {
	    la = back.read();
	    p = true;
	}
	return(la);
    }
    
    public int peek() throws IOException {
	return(peek(false));
    }
}