/***
* Copyright (c) 2009 Caelum - www.caelum.com.br/opensource
* All rights reserved.
*
* 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 br.com.caelum.vraptor.interceptor;
import br.com.caelum.vraptor.InterceptionException;
import br.com.caelum.vraptor.Intercepts;
import br.com.caelum.vraptor.core.InterceptorStack;
import br.com.caelum.vraptor.ioc.Container;
import br.com.caelum.vraptor.resource.ResourceMethod;
/**
* Using a request scoped container, instantiates a resource.<br/>
* Only instantiates the resource if it has not been instantiated so far, thus
* allowing composition of another component instantiator and this one.
*
* @author Guilherme Silveira
*/
@Intercepts(after=ResourceLookupInterceptor.class)
public class InstantiateInterceptor implements Interceptor {
private final Container container;
public InstantiateInterceptor(Container container) {
this.container = container;
}
public void intercept(InterceptorStack invocation, ResourceMethod method,
Object instance) throws InterceptionException {
if (instance == null) {
Class<?> type = method.getResource().getType();
instance = container.instanceFor(type);
}
invocation.next(method, instance);
}
public boolean accepts(ResourceMethod method) {
return true;
}
}