/*
    * Redistribution and use of this software and associated documentation ("Software"), with or
    * without modification, are permitted provided that the following conditions are met:
    *
    * 1. Redistributions of source code must retain copyright statements and notices. Redistributions
    * must also contain a copy of this document.
    *
    * 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.
   *
   * 3. The name "Exolab" must not be used to endorse or promote products derived from this Software
   * without prior written permission of Intalio, Inc. For written permission, please contact
   * info@exolab.org.
   *
   * 4. Products derived from this Software may not be called "Exolab" nor may "Exolab" appear in
   * their names without prior written permission of Intalio, Inc. Exolab is a registered trademark of
   * Intalio, Inc.
   *
   * 5. Due credit should be given to the Exolab Project (http://www.exolab.org/).
   *
   * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESSED 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 INTALIO, INC. OR ITS
   * 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.
   *
   * Copyright 1999 (C) Intalio, Inc. All Rights Reserved.
   *
   * $Id: CompareHelper.java 6785 2007-01-29 05:09:59Z ekuns $
   */
  package org.castor.xmlctf;
  
  import java.lang.reflect.Array;
  
  /**
   * Assists in the comparison of objects. This method is used by generated code but is not used
   * within the CTF directly.
   *
   * @author <a href="mailto:gignoux@intalio.com">Sebastien Gignoux</a>
   * @version $Revision: 6785 $ $Date: 2003-10-15 09:17:49 -0600 (Wed, 15 Oct 2003) $
   */
  public class CompareHelper {
  
    /**
     * Compare two objects. Return true if they are both null or if they are equal. This comparison
     * method has special handling for arrays: For arrays, each element is compared.
     * <p>
     * Warning: We will throw a NullPointerException if any element of either array is null.
     *
     * @param o1 first object
     * @param o2 second object
     * @return true if both objects are both null or otherwise are equal
     */
    public static boolean equals(Object o1, Object o2) {
      if (o1 == null && o2 == null) {
        return true;
      }
  
      if ((o1 != null && o2 == null) || (o1 == null && o2 != null)) {
        return false;
      }
  
      // From now we can safely assume (o1 != null && o2 != null)
  
      if (!o1.getClass().equals(o2.getClass())) {
        return false;
      }
  
      if (o1.getClass().isArray()) {
        return compareArray(o1, o2);
      }
  
      return o1.equals(o2);
    }
  
    /**
     * Compares two arrays, returning true if the arrays contain the same values.
     * <p>
     * Warning: We will throw a NullPointerException if any element of either array is null.
     *
     * @param o1 The first array
     * @param o2 The second array
     * @return true if the two objects represent arrays with the same values
     */
    private static boolean compareArray(Object o1, Object o2) {
      int size = Array.getLength(o1);
  
      if (size != Array.getLength(o2))
        return false;
  
      Class component = o1.getClass().getComponentType();
  
      if (!component.equals(o2.getClass().getComponentType()))
        return false;
  
     if (component.isPrimitive()) {
       return comparePrimitiveArray(o1, o2);
     }
 
     for (int i = 0; i < size; ++i) {
       if (!Array.get(o1, i).equals(Array.get(o2, i))) {
         return false;
       }
     }
 
     return true;
   }
 
   /**
    * Compares two arrays of primitive values. The caller should have tested that the two array have
    * the same length and that the component type are equal.
    *
    * @param o1 The first array
    * @param o2 The second array
    * @return true if the two objects represent arrays of the same primitive values
    */
   public static boolean comparePrimitiveArray(Object o1, Object o2) {
     Class component = o1.getClass().getComponentType();
     int size = Array.getLength(o1);
 
     if (component.equals(Boolean.TYPE)) {
       for (int i = 0; i < size; ++i) {
         if (Array.getBoolean(o1, i) != Array.getBoolean(o2, i)) {
           return false;
         }
       }
 
       return true;
     } else if (component.equals(Byte.TYPE)) {
       for (int i = 0; i < size; ++i) {
         if (Array.getByte(o1, i) != Array.getByte(o2, i)) {
           return false;
         }
       }
 
       return true;
     } else if (component.equals(Character.TYPE)) {
       for (int i = 0; i < size; ++i) {
         if (Array.getChar(o1, i) != Array.getChar(o2, i)) {
           return false;
         }
       }
 
       return true;
     } else if (component.equals(Double.TYPE)) {
       for (int i = 0; i < size; ++i) {
         if (Array.getDouble(o1, i) != Array.getDouble(o2, i)) {
           return false;
         }
       }
 
       return true;
     } else if (component.equals(Float.TYPE)) {
       for (int i = 0; i < size; ++i) {
         if (Array.getFloat(o1, i) != Array.getFloat(o2, i)) {
           return false;
         }
       }
 
       return true;
     } else if (component.equals(Integer.TYPE)) {
       for (int i = 0; i < size; ++i) {
         if (Array.getInt(o1, i) != Array.getInt(o2, i)) {
           return false;
         }
       }
 
       return true;
     } else if (component.equals(Long.TYPE)) {
       for (int i = 0; i < size; ++i) {
         if (Array.getLong(o1, i) != Array.getLong(o2, i)) {
           return false;
         }
       }
 
       return true;
     } else if (component.equals(Short.TYPE)) {
       for (int i = 0; i < size; ++i) {
         if (Array.getShort(o1, i) != Array.getShort(o2, i)) {
           return false;
         }
       }
 
       return true;
     } else {
       throw new IllegalArgumentException("Unexpected primitive type " + component.toString());
     }
   }
 
 }