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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2013, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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.jboss.weld.util.cache;

import static org.jboss.weld.logging.messages.UtilMessage.UNABLE_TO_LOAD_CACHE_VALUE;

import java.util.concurrent.ExecutionException;

import org.jboss.weld.exceptions.WeldException;

import com.google.common.cache.LoadingCache;
import com.google.common.util.concurrent.UncheckedExecutionException;

/**
 * Guava loading cache utilities.
 *
 * @author Martin Kouba
 */
public final class LoadingCacheUtils {

    private LoadingCacheUtils() {
    }

    /**
     * Get the cache value for the given key. Wrap possible {@link ExecutionException}.
     *
     * @param cache
     * @param key
     * @param  Key type
     * @param  Value type
     * @return the cache value
     */
    public static  V getCacheValue(LoadingCache cache, K key) {
        try {
            return cache.get(key);
        } catch (ExecutionException e) {
            throw new WeldException(UNABLE_TO_LOAD_CACHE_VALUE, e.getCause(), key);
        } catch (UncheckedExecutionException e) {
            Throwable cause = e.getCause();
            if (cause instanceof RuntimeException) {
                throw (RuntimeException) cause;
            }
            throw new WeldException(UNABLE_TO_LOAD_CACHE_VALUE, cause, key);
        }
    }

    /**
     * Get and cast the cache value for the given key.
     *
     * @param cache
     * @param key
     * @param  Required type
     * @param  Key type
     * @param  Value type
     * @return the cache value cast to the required type
     */
    @SuppressWarnings("unchecked")
    public static  T getCastCacheValue(LoadingCache cache, Object key) {
        return (T) getCacheValue(cache, (K) key);
    }

}