| // Copyright 2006, 2007, 2008 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; |
| |
| import org.apache.tapestry5.ioc.Configuration; |
| import org.apache.tapestry5.ioc.internal.util.Defense; |
| |
| /** |
| * Performs some validation before delegating to another Configuration. |
| */ |
| public class ValidatingConfigurationWrapper<T> implements Configuration<T> |
| { |
| private final String serviceId; |
| |
| private final Configuration<T> delegate; |
| |
| private final Class expectedType; |
| |
| // Need a strategy for determing the right order for this mass of parameters! |
| |
| public ValidatingConfigurationWrapper(String serviceId, Class expectedType, Configuration<T> delegate) |
| { |
| this.serviceId = serviceId; |
| this.expectedType = expectedType; |
| this.delegate = delegate; |
| } |
| |
| public void add(T object) |
| { |
| if (object == null) |
| throw new NullPointerException(IOCMessages.contributionWasNull(serviceId)); |
| |
| // Sure, we say it is type T ... but is it really? |
| |
| if (!expectedType.isInstance(object)) |
| throw new IllegalArgumentException(IOCMessages.contributionWrongValueType( |
| serviceId, |
| object.getClass(), |
| expectedType)); |
| |
| delegate.add(object); |
| } |
| |
| public void addInstance(Class<? extends T> clazz) |
| { |
| Defense.notNull(clazz, "clazz"); |
| |
| if (!expectedType.isAssignableFrom(clazz)) |
| throw new IllegalArgumentException(IOCMessages.wrongContributionClass(clazz, serviceId, expectedType)); |
| |
| delegate.addInstance(clazz); |
| } |
| } |