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Lightweight REST for Java

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/*
 * 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.httprpc.util;

import java.util.AbstractMap;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import java.util.Set;

/**
 * {@link Map} adapter for resource bundles.
 */
public class ResourceBundleAdapter extends AbstractMap {
    private ResourceBundle resourceBundle;

    /**
     * Constructs a new resource bundle adapter.
     *
     * @param resourceBundle
     * The source resource bundle.
     */
    public ResourceBundleAdapter(ResourceBundle resourceBundle) {
        if (resourceBundle == null) {
            throw new IllegalArgumentException();
        }

        this.resourceBundle = resourceBundle;
    }

    @Override
    public String get(Object key) {
        if (key == null) {
            throw new IllegalArgumentException();
        }

        try {
            return resourceBundle.getString(key.toString());
        } catch (MissingResourceException exception) {
            return null;
        }
    }

    @Override
    public boolean containsKey(Object key) {
        if (key == null) {
            throw new IllegalArgumentException();
        }

        return resourceBundle.containsKey(key.toString());
    }

    @Override
    public Set> entrySet() {
        throw new UnsupportedOperationException();
    }
}