/**

  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.inject.impl;

 import java.lang.reflect.Constructor;

 import java.lang.reflect.Method;

 import org.apache.commons.inject.api.IBinding;

 import org.apache.commons.inject.api.IInjector;

 import org.apache.commons.inject.api.IPoint;

 import org.apache.commons.inject.util.Exceptions;

 public class FactoryMethodProvider<T> extends AbstractBaseProvider<T> implements IInjectorAware {

         private final Constructor<T> constructor;

         private final Method method;

         private final IBinding<Object>[] parameterBindings;

         public FactoryMethodProvider(Constructor<T> pConstructor, IPoint<T> pPoint, IBinding<Object>[] pBindings) {

                 super(pConstructor.getDeclaringClass(), pPoint);

                 constructor = pConstructor;

                 method = null;

                 parameterBindings = pBindings;

         }

         @SuppressWarnings("unchecked")

         public FactoryMethodProvider(Method pMethod, IBinding<Object>[] pBindings, IPoint<T> pPoint) {

                 super((Class<T>) pMethod.getReturnType(), pPoint);

                 constructor = null;

                 method = pMethod;

                 parameterBindings = pBindings;

         }

         @Override

         public T get() {

                 try {

                         final Object[] parameters = new Object[parameterBindings.length];

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

                                 parameters[i] = parameterBindings[i].getProvider().get();

                         }

                         if (constructor == null) {

                                 @SuppressWarnings("unchecked")

                                 final T instance = (T) method.invoke(null, parameters);

                                 return instance;

                         } else {

                                 if (!constructor.isAccessible()) {

                                         constructor.setAccessible(true);

                                 }

                                 return constructor.newInstance(parameters);

                         }

                 } catch (Throwable t) {

                         throw Exceptions.show(t);

                 }

         }

         @Override

         public void init(IInjector pInjector) {

                 for (IBinding<Object> binding : parameterBindings) {

                         if (binding instanceof IInjectorAware) {

                                 ((IInjectorAware) binding).init(pInjector);

                         }

                 }

         }

 }