MergedBundle.java

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/*
 * MappingContext.java
 *
 * Created on January 28, 2002, 6:30 PM
 */

package com.sun.jdo.spi.persistence.utility;

import java.util.*;

/** Special resource bundle which delegates to two others.
 * Ideally could just set the parent on the first, but this is protected, 
 * so it might not work.  It's still unclear whether that approach would work 
 * in this subclass because it may break the localization fall through 
 * mechanism if used.
 * Note: This code is copied from NbBundle in the openide sources with 
 * the following modifications:
 * - reformatting
 * - making variables final
 * - renaming variables and some params
 * - removing locale code
 * - creating the merged set of keys using jdk classes and not nb utils
 *
 * @author Rochelle Raccah
 * @version %I%
 */
public class MergedBundle extends ResourceBundle
{
	private final ResourceBundle _mainBundle, _parentBundle;

	public MergedBundle (ResourceBundle mainBundle, 
		ResourceBundle parentBundle)
	{
		_mainBundle = mainBundle;
		_parentBundle = parentBundle;
	}

	public Enumeration getKeys () { return mergeKeys(); }

	private Enumeration mergeKeys ()
	{
		Set noDuplicatesMerge = 
			new HashSet(getCollection(_mainBundle.getKeys()));

		noDuplicatesMerge.addAll(getCollection(_parentBundle.getKeys()));

		return Collections.enumeration(noDuplicatesMerge);
	}

	private Collection getCollection (Enumeration enumeration)
	{
		List returnList = new ArrayList();

		if (enumeration != null)
		{
			while (enumeration.hasMoreElements())
				returnList.add(enumeration.nextElement());
		}

		return returnList;
	}

	protected Object handleGetObject (String key)
		throws MissingResourceException
	{
		try
		{
			return _mainBundle.getObject(key);
		}
		catch (MissingResourceException mre)	// try the other bundle
		{
			return _parentBundle.getObject(key);
		}
	}
}