# CachingInjectionProviderFactoryDecorator.java

    /*
     * Copyright (c) 2008, Rickard Öberg. All Rights Reserved.
     *
     * 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.qi4j.runtime.injection.provider;

    import org.qi4j.bootstrap.InvalidInjectionException;
    import org.qi4j.runtime.injection.DependencyModel;
    import org.qi4j.runtime.injection.InjectionProvider;
    import org.qi4j.runtime.injection.InjectionProviderFactory;
    import org.qi4j.runtime.model.Resolution;

    /**
     * JAVADOC
     */
    public class CachingInjectionProviderFactoryDecorator
        implements InjectionProviderFactory
    {
        private final InjectionProviderFactory decoratedFactory;

        public CachingInjectionProviderFactoryDecorator( InjectionProviderFactory decoratedFactory )
        {
            this.decoratedFactory = decoratedFactory;
        }

        @Override
        public InjectionProvider newInjectionProvider( Resolution resolution, DependencyModel dependencyModel )
            throws InvalidInjectionException
        {
            InjectionProvider injectionProvider = decoratedFactory.newInjectionProvider( resolution, dependencyModel );
            if( injectionProvider != null )
            {
                return new CachingInjectionProviderDecorator( injectionProvider );
            }
            else
            {
                return null;
            }
        }
    }