setstateparamfilter.java

来自「java编写的OCR软件」· Java 代码 · 共 87 行

/*
 * SetStateFilter.java
 *
 * Created on 27. Januar 2004, 11:46
 */

package de.spieleck.app.jacson.filter;

import de.spieleck.app.jacson.JacsonConfigException;


import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;

import de.spieleck.app.jacson.JacsonException;
import de.spieleck.app.jacson.JacsonRegistry;
import de.spieleck.app.jacson.JacsonState;
import de.spieleck.config.ConfigNode;

/**
 * This filter sets a state of Jacson state.<br>
 * The state is set during initialization. The actual filtering behaviour is
 * inherited from ConstFilter
 * @author  Patrick Carl
 */
public class SetStateParamFilter extends FilterBase {
    
    public static final String PARAMETER_NODE = "param";
    public static final String PARAMETER_NAME_NODE = "name";
    public static final String PARAMETER_VALUE_NODE = "value";
    public static final String REPEATING_NODE = "repeating";
    
    private boolean repeating = false;
    private boolean done = false;
    
    private Hashtable paramSettings = new Hashtable();
    
    /** Creates a new instance of SetStateFilter */
    public SetStateParamFilter() {
    }
    
    /**
     * nits this filter and sets params of the registered JacsonState
     */
    public void init(ConfigNode config, JacsonRegistry registry)
    throws JacsonConfigException {
        repeating = config.getBoolean(REPEATING_NODE,  true);
        
        Iterator it = config.childrenNamed(PARAMETER_NODE);
        ConfigNode param = null;
        
        while(it.hasNext()){
            param = (ConfigNode) it.next();
            paramSettings.put(param.getString(PARAMETER_NAME_NODE, null),
            param.getString(PARAMETER_VALUE_NODE, null));
        }
    }
    
    public boolean accept(ConfigNode node) {
        String name = node.getName();
        return name.equals(PARAMETER_NODE) ||
        name.equals(PARAMETER_NAME_NODE) || name.equals(PARAMETER_VALUE_NODE) ||
        name.equals(REPEATING_NODE);
    }
    
    public void putChunk(String chunk)
    throws JacsonException {
        if(repeating || !done){
            JacsonState state = getRegState();
            Enumeration keys = paramSettings.keys();
            Object key = null;
            Object val = null;
            while(keys.hasMoreElements()){
                key = keys.nextElement();
                if(key == null)
                    continue;
                val = paramSettings.get(key);
                if(val != null)
                    state.set(key.toString(), val.toString());
            }
            done = true;
        }
        drain.putChunk(chunk);
    }
}