    001    // Copyright 2009 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
    015    package org.apache.tapestry5.ioc.internal.util;
    016
    017    import java.lang.reflect.Type;
    018
    019    /**
    020     * Used when invoking a contribute method to guard against a request for the wrong type of configuration interface.
    021     */
    022    public class WrongConfigurationTypeGuard implements InjectionResources
    023    {
    024        private final String serviceId;
    025
    026        private final Class guardType;
    027
    028        private final Class expectedType;
    029
    030        public WrongConfigurationTypeGuard(String serviceId, Class guardType, Class expectedType)
    031        {
    032            this.serviceId = serviceId;
    033            this.guardType = guardType;
    034            this.expectedType = expectedType;
    035        }
    036
    037        public <T> T findResource(Class<T> type, Type genericType)
    038        {
    039            if (type == guardType)
    040                throw new IllegalArgumentException(String.format("Service '%s' is configured using %s, not %s.",
    041                                                                 serviceId,
    042                                                                 expectedType.getName(), guardType.getName()));
    043
    044            return null;
    045        }
    046    }