package org.apache.commons.ognl.internal.entry;

 /*

  * 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.

  */

 /*

  * $Id: GenericMethodParameterTypeFactory.java 1194956 2011-10-29 18:02:14Z mcucchiara $

  */

 import org.apache.commons.ognl.internal.CacheException;

 import java.lang.reflect.Array;

 import java.lang.reflect.GenericArrayType;

 import java.lang.reflect.ParameterizedType;

 import java.lang.reflect.Type;

 import java.lang.reflect.TypeVariable;

 public class GenericMethodParameterTypeFactory

     implements CacheEntryFactory<GenericMethodParameterTypeCacheEntry, Class<?>[]>

 {

     public Class<?>[] create( GenericMethodParameterTypeCacheEntry entry )

         throws CacheException

     {

         Class<?>[] types;

         ParameterizedType param = (ParameterizedType) entry.type.getGenericSuperclass();

         Type[] genTypes = entry.method.getGenericParameterTypes();

         TypeVariable<?>[] declaredTypes = entry.method.getDeclaringClass().getTypeParameters();

         types = new Class[genTypes.length];

         for ( int i = 0; i < genTypes.length; i++ )

         {

             TypeVariable<?> paramType = null;

             if ( TypeVariable.class.isInstance( genTypes[i] ) )

             {

                 paramType = (TypeVariable<?>) genTypes[i];

             }

             else if ( GenericArrayType.class.isInstance( genTypes[i] ) )

             {

                 paramType = (TypeVariable<?>) ( (GenericArrayType) genTypes[i] ).getGenericComponentType();

             }

             else if ( ParameterizedType.class.isInstance( genTypes[i] ) )

             {

                 types[i] = (Class<?>) ( (ParameterizedType) genTypes[i] ).getRawType();

                 continue;

             }

             else if ( Class.class.isInstance( genTypes[i] ) )

             {

                 types[i] = (Class<?>) genTypes[i];

                 continue;

             }

             Class<?> resolved = resolveType( param, paramType, declaredTypes );

             if ( resolved != null )

             {

                 if ( GenericArrayType.class.isInstance( genTypes[i] ) )

                 {

                     resolved = Array.newInstance( resolved, 0 ).getClass();

                 }

                 types[i] = resolved;

                 continue;

             }

             types[i] = entry.method.getParameterTypes()[i];

         }

         return types;

     }

     private Class<?> resolveType( ParameterizedType param, TypeVariable<?> var, TypeVariable<?>[] declaredTypes )

     {

         if ( param.getActualTypeArguments().length < 1 )

         {

             return null;

         }

         for ( int i = 0; i < declaredTypes.length; i++ )

         {

             if ( !TypeVariable.class.isInstance( param.getActualTypeArguments()[i] )

                 && declaredTypes[i].getName().equals( var.getName() ) )

             {

                 return (Class<?>) param.getActualTypeArguments()[i];

             }

         }

         return null;

     }

 }