maint-5-2/tapestry-ioc/src/main/java/org/apache/tapestry5/ioc/internal/util/WrongConfigurationTypeGuard.java

// Copyright 2009 The Apache Software Foundation
//
// 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.apache.tapestry5.ioc.internal.util;

import java.lang.reflect.Type;

/**
 * Used when invoking a contribute method to guard against a request for the wrong type of configuration interface.
 */
public class WrongConfigurationTypeGuard implements InjectionResources
{
    private final String serviceId;

    private final Class guardType;

    private final Class expectedType;

    public WrongConfigurationTypeGuard(String serviceId, Class guardType, Class expectedType)
    {
        this.serviceId = serviceId;
        this.guardType = guardType;
        this.expectedType = expectedType;
    }

    public <T> T findResource(Class<T> type, Type genericType)
    {
        if (type == guardType)
            throw new IllegalArgumentException(String.format("Service '%s' is configured using %s, not %s.",
                                                             serviceId,
                                                             expectedType.getName(), guardType.getName()));

        return null;
    }
}