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}