Path.java :  » Google-tech » gap-data » gap » odl » Java Open Source

/*
 * Gap Data
 * Copyright (C) 2009 John Pritchard
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */
package gap.odl;

import jauk.Pattern;

import java.io.IOException;
import java.util.StringTokenizer;

/**
 * 
 * @see Class
 * @author jdp
 */
public final class Path
    extends Object
    implements gap.data.HasName
{
    public final static Pattern Statement = new jauk.Re("<_>path [^;]*;<Newline>");


    private Comment comment;

    public final String name;

    public Path(Reader reader)
        throws IOException, Syntax
    {
        super();
        this.comment = reader.comment();
        String line = reader.next(Statement);
        if (null != line){
            StringTokenizer strtok = new StringTokenizer(line," \t\r\n;");
            if (2 == strtok.countTokens()){
                strtok.nextToken();
                this.name = Path.Normalize(strtok.nextToken());
                return;
            }
            else
                throw new Syntax("Malformed ODL path statement '"+line+"'.");
        }
        else 
            throw new Syntax("Path statement not found.");
    }

    public String getName(){
        return this.name;
    }
    public boolean hasComment(){
        return (null != this.comment);
    }
    public Comment getComment(){
        return this.comment;
    }

    public final static String Normalize(String path){
        if (null == path || 0 == path.length())
            throw new IllegalArgumentException();
        else {
            if ('/' != path.charAt(0))
                path = ("/"+path);

            int trm = (path.length()-1);
            
            if ('/' == path.charAt(trm))
                path = path.substring(0,trm);

            return path;
        }
    }
}