net.grinder.testutility.DelegatingStubFactory Maven / Gradle / Ivy

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// Copyright (C) 2004 - 2009 Philip Aston
// All rights reserved.
//
// This file is part of The Grinder software distribution. Refer to
// the file LICENSE which is part of The Grinder distribution for
// licensing details. The Grinder distribution is available on the
// Internet at http://grinder.sourceforge.net/
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.

package net.grinder.testutility;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;


/**
 *  {@link AbstractStubFactory} that intercepts and records
 *  invocations to a delegate.
 *
 * @author    Philip Aston
 */
public final class DelegatingStubFactory extends AbstractStubFactory {

  public static  DelegatingStubFactory create(T delegate) {
    return new DelegatingStubFactory(delegate);
  }

  private DelegatingStubFactory(T delegate) {
    super(getClass(delegate), new DelegatingInvocationHandler(delegate));
  }

  private static final class DelegatingInvocationHandler
    implements InvocationHandler {

    private final T m_delegate;

    public DelegatingInvocationHandler(T delegate) {
      m_delegate = delegate;
    }

    public Object invoke(Object proxy, Method method, Object[] parameters)
      throws Throwable {

      final Method delegateMethod =
        m_delegate.getClass().getMethod(
          method.getName(), method.getParameterTypes());

      return delegateMethod.invoke(m_delegate, parameters);
    }
  }
}