brokenlinkfilter.java

java编写的OCR软件

/*
 * BrokenLinkFilter.java
 *
 * Created on 4. April 2004, 17:21
 */

package de.spieleck.app.jacson.filter;

import de.spieleck.app.jacson.JacsonException;
import java.io.IOException;
import java.net.URL;
import java.io.InputStream;

/**
 * This filter checks if a given chunk, treated as URL works, i.e. the given
 * ressource is reachable
 * <br>
 * @author Patrick Carl
 * @since 0.89
 * @version $Id: BrokenLinkFilter.java 13 2005-09-28 06:02:56Z pcs $
 */
public class BrokenLinkFilter extends ConstFilter{
    
    /**
     * filters the given chunk out if <ul>
     *  <li>the given chunk represents a working URL and this filter is set to
     *      inverse</li> 
     *   <li>the given chunk represents no working URL and this filter is not 
     *      set to inverse</li>
     * </ul>
     *
     */
    public void putChunk(String chunk) throws JacsonException {
        try{
            URL url = new URL(chunk);
            InputStream is = url.openStream();
            if(inverse)
                drain.putChunk(chunk);
            is.close();
        } catch (IOException broken){
            if(!inverse)
                drain.putChunk(chunk);
        }
    }
}