/*
    * 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 org.apache.commons.jcs.jcache.cdi;
  
  import java.lang.annotation.Annotation;
  import java.util.List;
  import java.util.Set;
  
  import javax.cache.annotation.CacheInvocationContext;
  import javax.cache.annotation.CacheInvocationParameter;
  import javax.interceptor.InvocationContext;
  
  public class CacheInvocationContextImpl<A extends Annotation> extends CacheMethodDetailsImpl<A> implements CacheInvocationContext<A>
  {
      private static final Object[] EMPTY_ARGS = new Object[0];
  
      private CacheInvocationParameter[] parameters = null;
  
      public CacheInvocationContextImpl(final InvocationContext delegate, final A cacheAnnotation, final String cacheName,
                                        final CDIJCacheHelper.MethodMeta meta)
      {
          super(delegate, cacheAnnotation, cacheName, meta);
      }
  
      @Override
      public Object getTarget()
      {
          return delegate.getTarget();
      }
  
      @Override
      public CacheInvocationParameter[] getAllParameters()
      {
          if (parameters == null)
          {
              parameters = doGetAllParameters(null);
          }
          return parameters;
      }
  
      @Override
      public <T> T unwrap(final Class<T> cls)
      {
          if (cls.isAssignableFrom(getClass()))
          {
              return cls.cast(this);
          }
          throw new IllegalArgumentException(cls.getName());
      }
  
      protected CacheInvocationParameter[] doGetAllParameters(final Integer[] indexes)
      {
          final Object[] parameters = delegate.getParameters();
          final Object[] args = parameters == null ? EMPTY_ARGS : parameters;
          final Class<?>[] parameterTypes = meta.getParameterTypes();
          final List<Set<Annotation>> parameterAnnotations = meta.getParameterAnnotations();
  
          final CacheInvocationParameter[] parametersAsArray = new CacheInvocationParameter[indexes == null ? args.length : indexes.length];
          if (indexes == null)
          {
              for (int i = 0; i < args.length; i++)
              {
                  parametersAsArray[i] = newCacheInvocationParameterImpl(parameterTypes[i], args[i], parameterAnnotations.get(i), i);
              }
          }
          else
          {
              int outIdx = 0;
              for (int idx = 0; idx < indexes.length; idx++)
              {
                  final int i = indexes[idx];
                  parametersAsArray[outIdx] = newCacheInvocationParameterImpl(parameterTypes[i], args[i], parameterAnnotations.get(i), i);
                  outIdx++;
              }
          }
          return parametersAsArray;
      }
  
      private CacheInvocationParameterImpl newCacheInvocationParameterImpl(final Class<?> type, final Object arg,
                                                                           final Set<Annotation> annotations, final int i) {
          return new CacheInvocationParameterImpl(type, arg, annotations, i);
      }
  }