wordselect.java

java编写的OCR软件

/*
    Jacson - Text Filtering with Java.
    Copyright (C) 2003 Patrick Carl, [e-mail]
 
    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
 
 
    $Id: WordSelect.java 13 2005-09-28 06:02:56Z pcs $
 
 */

package de.spieleck.app.jacson.select;

import de.spieleck.app.jacson.SelectionResult;
import de.spieleck.app.jacson.JacsonSelect;
import de.spieleck.app.jacson.JacsonRegistry;
import de.spieleck.app.jacson.JacsonConfigException;
import de.spieleck.config.ConfigNode;
import de.spieleck.config.ConfigVerify.Acceptor;


/**
 * Selects every word out of a chunk and returns them as chunks. To separate
 * the words delimiters are used in a "StringTokenizer-way".
 * (@see java.util.StringTokenizer). The delimiters themselves are not returned
 * as words.
 * @author  Patrick Carl
 * @author fsn
 */
public class WordSelect implements JacsonSelect, Acceptor {
    
    public final static String DELIMS_NODE = "delims";
    public final static String DEFAULT_DELIM = " ;.:?!.,-_()[]{}=<>\t\n";
    
    protected String delims = DEFAULT_DELIM;
    protected String currentChunk;
    protected int lastMatch;
    protected int length;
    
    protected SimpleResult result;
    
    /** Creates a new instance of WordSelect */
    public WordSelect() {
        result = new SimpleResult();
    }
    
    /**
     * A word is delimited by one or multiple of the given delimiter
     * characters or by the beginning and the end of the chunk
     * @return the next word of the chunk in a SelectionResult.
     */
    public SelectionResult getNextSelection() {
        if(currentChunk == null)
            return null;
        
        // Skip trailing/leading Delimiters
        while ( lastMatch < length 
                && delims.indexOf(currentChunk.charAt(lastMatch)) != -1 )
            lastMatch++;

        if(lastMatch  >= length)
            return null;
        
        // Grab the "word", that is all following non delimiters
        int start = lastMatch;
        while ( lastMatch < length
                && delims.indexOf(currentChunk.charAt(lastMatch)) == -1 )
            lastMatch++;

        result.set(start, lastMatch, currentChunk.substring(start, lastMatch));
        return result;
    }
    
    public void init(ConfigNode node, JacsonRegistry registry)
    throws JacsonConfigException {
        setDelims(node.getString(DELIMS_NODE, null));
    }
    
    /**
     * inits the delimiters to be used
     */
    public void setDelims(String delimsString){
        if ( delimsString == null || delimsString.length() == 0 )
            delimsString = DEFAULT_DELIM;
        // XXX We could check the delims for double characters here!
        delims = delimsString;
    }
    
    public void setChunk(String chunk) {
        currentChunk = chunk;
        lastMatch = 0;
        length = currentChunk.length();
    }
    
    public boolean accept(ConfigNode node) {
        return DELIMS_NODE.equals(node.getName());
    }
    
}