uniqfilter.java

java编写的OCR软件

package de.spieleck.app.jacson.filter;

import de.spieleck.app.jacson.JacsonException;

/**
 * Filter out chunks which equal a direct preceding one.
 * (Or with inverse flag, let only through chunks which equal the preceeding).
 * <p>
 * These are either omitted or the only one delivered (with inverse).
 * This somewhat resembles the uniq UNIX-Tool. 
 * </p>
 * @author fsn
 */
public class UniqFilter
    extends ConstFilter
{
    /** The remembered last Chunk. */
    protected String preChunk = null;

    public UniqFilter() { }

    public void putChunk(String chunk)
        throws JacsonException
    {
        if ( chunk == null )
            drain.putChunk(null);
        else if ( inverse || preChunk == null )
            return;
        else
        {
            if ( !chunk.equals(preChunk) ^ inverse )
                drain.putChunk(chunk);
        }
        preChunk = chunk;
    }
}
//
//    Jacson - Text Filtering with Java.
//    Copyright (C) 2002 Frank S. Nestel (nestefan -at- users.sourceforge.net)
//
//    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
//