/*******************************************************************************
 * Copyright (c) 2013 EclipseSource.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Ralf Sternberg - initial implementation and API
 ******************************************************************************/
package org.eclipse.rap.json;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import static org.junit.Assert.*;


public class TestUtil {

  public static <T extends Exception> T assertException( Class<T> type,
                                                         String message,
                                                         Runnable runnable )
  {
    T exception = assertException( type, runnable );
    assertEquals( "message", message, exception.getMessage() );
    return exception;
  }

  @SuppressWarnings( "unchecked" )
  public static <T extends Exception> T assertException( Class<T> type, Runnable runnable ) {
    Exception exception = catchException( runnable );
    assertNotNull( "Expected exception: " + type.getName(), exception );
    assertSame( "exception type", type, exception.getClass() );
    return (T)exception;
  }

  private static Exception catchException( Runnable runnable ) {
    try {
      runnable.run();
      return null;
    } catch( Exception exception ) {
      return exception;
    }
  }

  @SuppressWarnings("unchecked")
  public static <T> T serializeAndDeserialize( T instance ) throws Exception {
    return ( T )deserialize( serialize( instance ) );
  }

  public static byte[] serialize( Object object ) throws IOException {
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    new ObjectOutputStream( outputStream ).writeObject( object );
    return outputStream.toByteArray();
  }

  public static Object deserialize( byte[] bytes ) throws IOException, ClassNotFoundException {
    ByteArrayInputStream inputStream = new ByteArrayInputStream( bytes );
    return new ObjectInputStream( inputStream ).readObject();
  }

}