substringselect.java

java编写的OCR软件

package de.spieleck.app.jacson.select;

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

import de.spieleck.app.jacson.JacsonSelect;
import de.spieleck.app.jacson.SelectionResult;
import de.spieleck.app.jacson.JacsonRegistry;
import de.spieleck.app.jacson.JacsonConfigException;
import de.spieleck.app.jacson.util.ConfigUtil;

/**
 * Select Strings as a <code>java.lang.String.substring()</code> would do.
 * @author fsn
 */
public class SubstringSelect
    implements JacsonSelect, Acceptor
{
    public final static String FROM_NODE = "from";
    public final static String TO_NODE = "to";

    protected int from, to;

    protected String curChunk;
    protected boolean first;

    protected SimpleResult result = new SimpleResult();

    public void init(ConfigNode config, JacsonRegistry registry)
        throws JacsonConfigException
    {
        from = config.getInt(FROM_NODE, -1);
        to   = config.getInt(TO_NODE, -1);
        if ( from == -1 || to == -1 )
            ConfigUtil.exception("SubstringSelect needs from and to", config);
        if ( from > to )
            ConfigUtil.exception("SubstringSelect: from > to.", config);
        ConfigUtil.verify(config, this);
    }

    public boolean accept(ConfigNode cn)
    {
        if ( !cn.getName().equals(FROM_NODE)
            && !cn.getName().equals(TO_NODE) )
            return false;
        // XXX Missing duplication check
        return true;
    }

    public void setChunk(String chunk)
    {
        curChunk = chunk;
        first = true;
    }

    public SelectionResult getNextSelection()
    {
        if ( !first || curChunk == null )
            return null;
        first = false;
        int h = curChunk.length();
        if ( h < from )
            return null;
        if ( curChunk.length() < to )
            result.set(from, curChunk.length(), curChunk.substring(from) );
        else
            result.set(from, to, curChunk.substring(from, to) );
        return result;
    }
}
//
//    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
//