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    • io.fabric8.zjsonpatch.internal.collections4.DefaultEquator Maven / Gradle / Ivy

    /**
 * Copyright 2016 flipkart.com zjsonpatch.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.fabric8.zjsonpatch.internal.collections4;

import java.io.Serializable;

/**
 * Default {@link Equator} implementation.
 *
 * @param  the types of object this {@link Equator} can evaluate.
 * @version $Id: DefaultEquator.html 887892 2013-11-24 13:43:45Z tn $
 * @since 4.0
 */
public class DefaultEquator implements Equator, Serializable {

  /**
   * Static instance
   */
  @SuppressWarnings("rawtypes") // the static instance works for all types
  public static final DefaultEquator INSTANCE = new DefaultEquator();
  /**
   * Hashcode used for null objects.
   */
  public static final int HASHCODE_NULL = -1;
  /**
   * Serial version UID
   */
  private static final long serialVersionUID = 825802648423525485L;

  /**
   * Restricted constructor.
   */
  private DefaultEquator() {
    super();
  }

  /**
   * Factory returning the typed singleton instance.
   *
   * @param  the object type
   * @return the singleton instance
   */
  @SuppressWarnings("unchecked") // the static instance works for all types
  public static  DefaultEquator defaultEquator() {
    return (DefaultEquator) DefaultEquator.INSTANCE;
  }

  /**
   * {@inheritDoc} Delegates to {@link Object#equals(Object)}.
   */
  public boolean equate(final T o1, final T o2) {
    return o1 == o2 || o1 != null && o1.equals(o2);
  }

  /**
   * {@inheritDoc}
   *
   * @return o.hashCode() if o is non-
   * null, else {@link #HASHCODE_NULL}.
   */
  public int hash(final T o) {
    return o == null ? HASHCODE_NULL : o.hashCode();
  }

  private Object readResolve() {
    return INSTANCE;
  }

}
    
    
    
    

    




    
    
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