Package br.com.caelum.vraptor.core

Source Code of br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler

/***
* 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.core;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import br.com.caelum.vraptor.InterceptionException;
import br.com.caelum.vraptor.interceptor.Interceptor;
import br.com.caelum.vraptor.ioc.Container;
import br.com.caelum.vraptor.resource.ResourceMethod;

/**
* Instantiates the interceptor on the fly and executes its method.
*
* @author Guilherme Silveira
*/
public class ToInstantiateInterceptorHandler implements InterceptorHandler {

  private static final Logger logger = LoggerFactory.getLogger(ToInstantiateInterceptorHandler.class);

  private final Container container;
  private final Class<?> type;

  public ToInstantiateInterceptorHandler(Container container, Class<?> type) {
    this.container = container;
    this.type = type;
  }

  public void execute(InterceptorStack stack, ResourceMethod method, Object resourceInstance)
      throws InterceptionException {
    Interceptor interceptor = Interceptor.class.cast(container.instanceFor(type));
    if (interceptor == null) {
      throw new InterceptionException("Unable to instantiate interceptor for " + type.getName()
          + ": the container returned null.");
    }
    if (interceptor.accepts(method)) {
      logger.debug("Invoking interceptor {}", interceptor.getClass().getSimpleName());
      interceptor.intercept(stack, method, resourceInstance);
    } else {
      stack.next(method, resourceInstance);
    }
  }

  @Override
  public String toString() {
    return "ToInstantiateHandler for " + type.getName();
  }
}
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