/*
 * @(#)PrefixParserAction.java	1.17 03/12/19
 * 
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package com.sun.corba.se.impl.orb ;

import org.omg.CORBA.INITIALIZE ;

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

import java.lang.reflect.Array ;

import com.sun.corba.se.spi.orb.Operation ;
import com.sun.corba.se.spi.orb.StringPair ;
import com.sun.corba.se.spi.logging.CORBALogDomains ;

import com.sun.corba.se.impl.orbutil.ObjectUtility ;
import com.sun.corba.se.impl.logging.ORBUtilSystemException ;

public class PrefixParserAction extends ParserActionBase {
    private Class componentType ;
    private ORBUtilSystemException wrapper ;

    public PrefixParserAction( String propertyName, 
	Operation operation, String fieldName, Class componentType )
    {
	super( propertyName, true, operation, fieldName ) ;
	this.componentType = componentType ;
	this.wrapper = ORBUtilSystemException.get( 
	    CORBALogDomains.ORB_LIFECYCLE ) ;
    }

    /** For each String s that matches the prefix given by getPropertyName(),
     * apply getOperation() to { suffix( s ), value }
     * and add the result to an Object[]
     * which forms the result of apply.  Returns null if there are no
     * matches.
     */
    public Object apply( Properties props ) 
    {
	String prefix = getPropertyName() ;
	int prefixLength = prefix.length() ;
	if (prefix.charAt( prefixLength - 1 ) != '.') {
	    prefix += '.' ;
	    prefixLength++ ;
	}
	    
	List matches = new LinkedList() ;

	// Find all keys in props that start with propertyName
	Iterator iter = props.keySet().iterator() ;
	while (iter.hasNext()) {
	    String key = (String)(iter.next()) ;
	    if (key.startsWith( prefix )) {
		String suffix = key.substring( prefixLength ) ;
		String value = props.getProperty( key ) ;
		StringPair data = new StringPair( suffix, value ) ;
		Object result = getOperation().operate( data ) ;
		matches.add( result ) ;
	    }
	}

	int size = matches.size() ;
	if (size > 0) {
	    // Convert the list into an array of the proper type.
	    // An Object[] as a result does NOT work.  Also report
	    // any errors carefully, as errors here or in parsers that
	    // use this Operation often show up at ORB.init().
	    Object result = null ;
	    try {
		result = Array.newInstance( componentType, size ) ;
	    } catch (Throwable thr) {
		throw wrapper.couldNotCreateArray( thr,
		    getPropertyName(), componentType,
		    new Integer( size ) ) ;
	    }

	    Iterator iter2 = matches.iterator() ;
	    int ctr = 0 ;
	    while (iter2.hasNext()) {
		Object obj = iter2.next() ;

		try {
		    Array.set( result, ctr, obj ) ;
		} catch (Throwable thr) {
		    throw wrapper.couldNotSetArray( thr,
			getPropertyName(), new Integer(ctr), 
			componentType, new Integer(size),
			ObjectUtility.compactObjectToString( obj )) ;
		}
		ctr++ ;
	    }

	    return result ;
	} else 
	    return null ;
    }
}