001//  Copyright 2008, 2010 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.ioc.internal.services;
016
017import org.apache.tapestry5.commons.AnnotationProvider;
018import org.apache.tapestry5.commons.ObjectLocator;
019import org.apache.tapestry5.commons.ObjectProvider;
020import org.apache.tapestry5.ioc.annotations.Autobuild;
021
022/**
023 * Checks for the {@link org.apache.tapestry5.ioc.annotations.Autobuild} annotation and, if so
024 * invokes {@link org.apache.tapestry5.commons.ObjectLocator#autobuild(Class)} on it.
025 */
026public class AutobuildObjectProvider implements ObjectProvider
027{
028    @Override
029    public <T> T provide(Class<T> objectType, AnnotationProvider annotationProvider,
030            ObjectLocator locator)
031    {
032        Autobuild annotation = annotationProvider.getAnnotation(Autobuild.class);
033
034        if (annotation != null)
035            return locator
036                    .autobuild("Autobuilding instance of " + objectType.getName(), objectType);
037
038        return null;
039    }
040}