/*
 * #%L
 * Common package for I/O and related utilities
 * %%
 * Copyright (C) 2005 - 2015 Open Microscopy Environment:
 *   - Board of Regents of the University of Wisconsin-Madison
 *   - Glencoe Software, Inc.
 *   - University of Dundee
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * 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.
 * #L%
 */

package loci.common.services;

/**
 * Exception thrown when there is an object instantiation error or error
 * processing dependencies.
 *
 * @author Chris Allan <callan at blackcat dot ca>
 */
public class DependencyException extends Exception
{
  /** Serial for this version. */
  private static final long serialVersionUID = -7836244849086491562L;
  
  /** The class that was used in a failed instantiation. */
  private Class<? extends Service> failureClass;

  /**
   * Default constructor.
   * @param message Error message.
   */
  public DependencyException(String message)
  {
    super(message);
  }

  /**
   * Default constructor.
   * @param message Error message. 
   * @param klass Failed instantiation class.
   */
  public DependencyException(String message, Class<? extends Service> klass)
  {
    super(message);
    this.failureClass = klass;
  }

  /**
   * Default constructor.
   * @param message Error message. 
   * @param klass Failed instantiation class.
   * @param cause Upstream exception.
   */
  public DependencyException(String message, Class<? extends Service> klass,
      Throwable cause)
  {
    super(message, cause);
    this.failureClass = klass;
  }

  /**
   * Default constructor.
   * @param cause Upstream exception.
   */
  public DependencyException(Throwable cause)
  {
    super(cause);
  }

  /**
   * Returns the class that was used during a failed instantiation.
   * @return See above.
   */
  public Class<? extends Service> getFailureClass()
  {
    return failureClass;
  }

  @Override
  public String toString()
  {
    if (failureClass == null)
    {
      return getMessage();
    }
    return getMessage() + " for " + failureClass;
  }
}