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Google App Engine compliant variation of FreeMarker. FreeMarker is a "template engine"; a generic tool to generate text output based on templates.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package freemarker.template;

import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

/**
 * A concrete implementation of {@link LocalizedString} that gets 
 * a localized string from a {@link java.util.ResourceBundle}  
 */

public class ResourceBundleLocalizedString extends LocalizedString {
	
	private String resourceKey, resourceBundleLookupKey;
	
	/**
	 * @param resourceBundleLookupKey The lookup key for the resource bundle
	 * @param resourceKey the specific resource (assumed to be a string) to fish out of the resource bundle
	 */
	
	public ResourceBundleLocalizedString(String resourceBundleLookupKey, String resourceKey) { 
		this.resourceBundleLookupKey = resourceBundleLookupKey;
		this.resourceKey = resourceKey;
	}

	@Override
    public String getLocalizedString(Locale locale) throws TemplateModelException {
		try {
			ResourceBundle rb = ResourceBundle.getBundle(resourceBundleLookupKey, locale);
			return rb.getString(resourceKey);
		} catch (MissingResourceException mre) {
			throw new TemplateModelException("missing resource", mre);
		}
	}
}