propertyparser.java

java1.6众多例子参考

/*
 * @(#)PropertyParser.java	1.12 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package com.sun.corba.se.spi.orb ;

import java.util.List ;
import java.util.LinkedList ;
import java.util.Map ;
import java.util.HashMap ;
import java.util.Iterator ;
import java.util.Properties ;

import com.sun.corba.se.impl.orb.ParserAction ;
import com.sun.corba.se.impl.orb.ParserActionFactory ;

public class PropertyParser {
    private List actions ;

    public PropertyParser( ) 
    {
	actions = new LinkedList() ;
    }

    public PropertyParser add( String propName, 
	Operation action, String fieldName )
    {
	actions.add( ParserActionFactory.makeNormalAction( propName, 
	    action, fieldName ) ) ;
	return this ;
    }

    public PropertyParser addPrefix( String propName, 
	Operation action, String fieldName, Class componentType )
    {
	actions.add( ParserActionFactory.makePrefixAction( propName, 
	    action, fieldName, componentType ) ) ;
	return this ;
    }

    /** Return a map from field name to value.
    */
    public Map parse( Properties props )
    {
	Map map = new HashMap() ;
	Iterator iter = actions.iterator() ;
	while (iter.hasNext()) {
	    ParserAction act = (ParserAction)(iter.next()) ;
    
	    Object result = act.apply( props ) ; 
		
	    // A null result means that the property was not set for
	    // this action, so do not override the default value in this case.
	    if (result != null)
		map.put( act.getFieldName(), result ) ;
	}

	return map ;
    }

    public Iterator iterator() 
    {
	return actions.iterator() ;
    }
}