/*
 * Copyright 2011-2023 the original author or authors.
 *
 * Licensed 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 org.appng.api.support;

import java.util.Locale;
import java.util.ResourceBundle;
import java.util.Set;
import java.util.TreeSet;

/**
 * A {@link org.springframework.context.support.ResourceBundleMessageSource} that can retrieve the available keys.
 * 
 * @author Matthias Müller
 */
public class ResourceBundleMessageSource extends org.springframework.context.support.ResourceBundleMessageSource {

	/**
	 * Returns the keys for the given locale
	 * 
	 * @param locale
	 *               the {@link Locale} to get the keys for
	 * 
	 * @return a (sorted) set of keys
	 * 
	 * @see ResourceBundle#keySet()
	 */
	public Set<String> getKeys(Locale locale) {
		Set<String> keys = new TreeSet<>();
		getBasenameSet().forEach(b -> keys.addAll(getResourceBundle(b, locale).keySet()));
		return keys;
	}

}
