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/**
 *  Copyright 2011-2013 Terracotta, Inc.
 *  Copyright 2011-2013 Oracle America Incorporated
 *
 *  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.jsr107.ri.annotations.guice;

import com.google.inject.Injector;
import org.aopalliance.intercept.MethodInvocation;
import org.jsr107.ri.annotations.AbstractCacheLookupUtil;
import org.jsr107.ri.annotations.InternalCacheInvocationContext;
import org.jsr107.ri.annotations.InternalCacheKeyInvocationContext;
import org.jsr107.ri.annotations.StaticCacheInvocationContext;
import org.jsr107.ri.annotations.StaticCacheKeyInvocationContext;

import javax.cache.annotation.CacheKeyGenerator;
import javax.cache.annotation.CacheResolverFactory;
import javax.inject.Inject;
import javax.inject.Singleton;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

/**
 * @author Michael Stachel
 * @version $Revision$
 */
@Singleton
public class CacheLookupUtil extends AbstractCacheLookupUtil {

  private final Injector injector;
  private final CacheKeyGenerator defaultCacheKeyGenerator;
  private final CacheResolverFactory defaultCacheResolverFactory;

  /**
   * @param injector                    Guice injector
   * @param defaultCacheKeyGenerator    the default CacheKeyGenerator
   * @param defaultCacheResolverFactory the default CacheResolverFactory
   */
  @Inject
  public CacheLookupUtil(Injector injector, CacheKeyGenerator defaultCacheKeyGenerator,
                         CacheResolverFactory defaultCacheResolverFactory) {
    this.injector = injector;
    this.defaultCacheKeyGenerator = defaultCacheKeyGenerator;
    this.defaultCacheResolverFactory = defaultCacheResolverFactory;
  }

  @SuppressWarnings({"unchecked" })
  @Override
  protected InternalCacheKeyInvocationContext createCacheKeyInvocationContextImpl(
      StaticCacheKeyInvocationContext staticCacheKeyInvocationContext, MethodInvocation invocation) {
    return new GuiceInternalCacheKeyInvocationContext(staticCacheKeyInvocationContext, invocation);
  }

  @SuppressWarnings({"unchecked" })
  @Override
  protected InternalCacheInvocationContext createCacheInvocationContextImpl(
      StaticCacheInvocationContext staticCacheInvocationContext, MethodInvocation invocation) {
    return new GuiceInternalCacheInvocationContext(staticCacheInvocationContext, invocation);
  }

  @Override
  protected Class getTargetClass(MethodInvocation invocation) {
    return invocation.getThis().getClass();
  }

  @Override
  protected Method getMethod(MethodInvocation invocation) {
    return invocation.getMethod();
  }

  @Override
  protected  T getObjectByType(Class type) {
    return this.injector.getInstance(type);
  }

  @Override
  protected CacheKeyGenerator getDefaultCacheKeyGenerator() {
    return this.defaultCacheKeyGenerator;
  }

  @Override
  protected CacheResolverFactory getDefaultCacheResolverFactory() {
    return this.defaultCacheResolverFactory;
  }
}