    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
    015package org.apache.tapestry5.ioc.internal.util;
    016
    017import 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 */
    022public 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    @Override
    038    public <T> T findResource(Class<T> type, Type genericType)
    039    {
    040        if (type == guardType)
    041            throw new IllegalArgumentException(String.format("Service '%s' is configured using %s, not %s.",
    042                                                             serviceId,
    043                                                             expectedType.getName(), guardType.getName()));
    044
    045        return null;
    046    }
    047}