regexpevaluator.java

java编写的OCR软件

package de.spieleck.app.jacson.eval;

import java.util.*;

import org.apache.oro.text.regex.*;

import de.spieleck.config.ConfigNode;
import de.spieleck.config.ConfigVerify.Acceptor;
import de.spieleck.util.FastClassForName;

import de.spieleck.app.jacson.JacsonNames;
import de.spieleck.app.jacson.JacsonRegistry;
import de.spieleck.app.jacson.JacsonConfigException;
import de.spieleck.app.jacson.JacsonException;
import de.spieleck.app.jacson.JacsonReport;
import de.spieleck.app.jacson.JacsonBlock;

import de.spieleck.app.jacson.util.RegExpUtil;
import de.spieleck.app.jacson.util.ConfigUtil;

/**
 * Regexp based Evaluator for {@link de.spieleck.app.jacson.Jacson} uses pluggable
 * handlers to actually react on the Matches.
 * <br/><b>Note:</b> This might not be necessary any more sometimes
 * soon, since with the latest pack of filters similar effects
 * should be creatable without the Subhandler thing. Use with caution.
 * @author fsn
 */
public class RegExpEvaluator
    extends EvaluatorBase
    implements Acceptor, JacsonNames
{
    public final static String HANDLER_NODE = "handler";

    /** oro-Regexp-Pattern */
    protected Pattern pattern;

    /** Handlers for matches */
    protected List handlers;

    /** Counter for total matches */
    protected long matches;

    /** Output Marker */
    protected String label;

    protected RegExpUtil rutil;

    public RegExpEvaluator()
    {
    }

    public void init(ConfigNode node, JacsonRegistry registry)
        throws JacsonConfigException
    {
        matches = 0;
        obtainHandlers(node, registry.find(node,HANDLER_NODE), registry);
        if ( handlers.size() == 0 )
          ConfigUtil.exception(
              "RexExpEvalutator needs at least one handler", node);
        label = registry.scanForString(JS_OBJ_LABEL, node);
        rutil = registry.getRegExpUtil();
        pattern = rutil.obtainPattern("RegExpEvalutator", node, registry);
    }

    public boolean accept(ConfigNode cn)
    {
        String name = cn.getName();
        return name.equals(HANDLER_NODE) 
            || name.equals(JS_OBJ_LABEL) 
            || JacsonRegistry.acceptId(cn)
            || rutil.accept(cn);
    }

    public void obtainHandlers(ConfigNode node,
                                  Iterator iter, JacsonRegistry registry)
        throws JacsonConfigException
    {
        handlers = new LinkedList();
        while ( iter.hasNext() )
        {
            ConfigNode handlerConfig = (ConfigNode) iter.next();
            String clazz = handlerConfig.getString();
            RegExpHandler handler = (RegExpHandler) FastClassForName.newInstance(
                    clazz, "de.spieleck.app.jacson.eval.rhandler.", 
                    RegExpHandler.class);
            if ( handler == null )
                ConfigUtil.exception("No Handler: "+clazz, node);
            handler.init(handlerConfig, registry);
            handlers.add(handler);
        }
    }

    public void registerReport(JacsonReport jr)
    {
        super.registerReport(jr);
        JacsonBlock.registerReport(handlers.iterator(), jr);
    }

    public void putChunk(String chunk)
        throws JacsonException
    {
        if ( chunk == null )
            return;
        PatternMatcher matcher = rutil.getMatcher();
        if ( matcher.matches(chunk, pattern) )
        {
            matches++;
            MatchResult mRes = matcher.getMatch();
            Iterator it = handlers.iterator();
            while ( it.hasNext() )
            {
                RegExpHandler rh = (RegExpHandler) it.next();
                rh.handle(getRegState(), chunk, mRes);
            }
        }
    }

    public void summary()
    {
        JacsonReport jr = getRegReport();
        jr.begin("regexp");
        if ( label != null )
            jr.report("label", label);
        jr.report("matches", ""+matches);
        jr.begin("list");
        JacsonBlock.summary(handlers.iterator());
        jr.end();
        jr.end();
    }
}
//
//    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
//