jacsonreader.java.pipeproblem

java编写的OCR软件

package de.spieleck.app.jacson;

import java.io.Reader;
import java.io.FilterReader;
import java.io.IOException;
import java.io.PipedWriter;
import java.io.PipedReader;
import java.io.PrintWriter;

import de.spieleck.config.ConfigNode;

import de.spieleck.app.jacson.source.LineChunkSource;

/**
 * Wrap a Jacson into a {@link java.io.FilterReader}.
 *
 * @author fsn
 */
public class JacsonReader
    extends FilterReader
{
    /** Embedded worker Jacson */
    protected Jacson jacson;

    /** The state used by this Jacson */
    protected JacsonState rootState;

    /** 
     * Create a new Reader with a prescribed configuration.
     *
     * @param configName Name of the configuration file to be parsed.
     */
    public JacsonReader(String configName)
        throws JacsonConfigException, IOException
    { 
        super(new PipedReader());
        PipedWriter pWriter = new PipedWriter();
        pWriter.connect((PipedReader) in);
        rootState = new JacsonState();
        ConfigNode config = Jacson.obtainConfig(configName, rootState);
        jacson = new Jacson(config, rootState);
        jacson.getReport().setPrintWriter(new PrintWriter(pWriter));
    }

    /**
     * Set a Reader to run through the Jacson job.
     * This actually spawns a Thread which runs Jacson which
     * feeds the PipedReader embedded. XXX Note if you want to feed
     * more Readers through this class, every request spawns a thread
     * and each thread blocks on the synchronization. This can become
     * inefficient in such a case the ThreadPool should be used, to
     * manage assignments.
     *
     * @param reader The Reader to read input from
     */
    public void setReader(Reader reader)
        throws JacsonException, IOException
    {
        final LineChunkSource lcs = new LineChunkSource();
        lcs.setReader(reader);
        Thread th = new Thread(new Runnable()
                      {
                          public void run()
                          {
                              synchronized(jacson)
                              {
                                  try
                                  {
                                      jacson.run(lcs);
                                      jacson.summary();
                                  }
                                  catch ( Exception e )
                                  {
                                      e.printStackTrace();
                                  }
                              }
                          }
                      });
        th.setDaemon(true);
        th.start();
    }
}
//
//    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
//