/*
 * Copyright (c) 2005-2016 Vincent Vandenschrick. All rights reserved.
 *
 *  This file is part of the Jspresso framework.
 *
 *  Jspresso is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Jspresso is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with Jspresso.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.jspresso.framework.util.lang;

import java.sql.Timestamp;

/**
 * Helper class for objects operations.
 *
 * @author Vincent Vandenschrick
 */
public final class ObjectUtils {

  private ObjectUtils() {
    // Helper class constructor
  }

  /**
   * Compares two objects for equality.
   *
   * @param object1
   *          the first object, may be {@code null}
   * @param object2
   *          the second object, may be {@code null}
   * @return {@code true} if the values of both objects are the same
   */
  public static boolean equals(Object object1, Object object2) {
    if (object1 == object2) {
      return true;
    }
    if ((Boolean.FALSE.equals(object1) && object2 == null)
        || (Boolean.FALSE.equals(object2) && object1 == null)) {
      // Special handling for null == Boolean.FALSE on models.
      // Cancelled to support 3-state boolean, i.e. null, TRUE and FALSE
      // return true;
      return false;
    }
    if ((object1 == null) || (object2 == null)) {
      return false;
    }
    if (object1 instanceof Number && object2 instanceof Number) {
      return ((Number) object1).doubleValue() == ((Number) object2)
          .doubleValue();
    }
    if (object1 instanceof Timestamp) {
      // there is a bug where a date equals a timestamp but not reflexively !
      return object2.equals(object1);
    }
    return object1.equals(object2);
  }

  /**
   * Extracts the raw classname from a potentially generic one.
   *
   * @param sourceClassName
   *          the source class name, potentially containing generics
   *          information.
   * @return the raw class name.
   */
  public static String extractRawClassName(String sourceClassName) {
    int genericIndex = sourceClassName.indexOf("<");
    if (genericIndex > 0) {
      return sourceClassName.substring(0, genericIndex);
    }
    return sourceClassName;
  }
}