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/**
 *
 * @author Wei-Ming Wu
 *
 *
 * Copyright 2013 Wei-Ming Wu
 *
 * 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 net.sf.rubycollect4j.succ;

/**
 * 
 * LongSuccessor generates a successor of any given Long. It's a singleton
 * object.
 * 
 */
public final class LongSuccessor implements Successive {

  private static final LongSuccessor INSTANCE = new LongSuccessor();

  private LongSuccessor() {}

  /**
   * Returns a LongSuccessor.
   * 
   * @return a LongSuccessor
   */
  public static LongSuccessor getInstance() {
    return LongSuccessor.INSTANCE;
  }

  @Override
  public Long succ(Long curr) {
    return curr + 1;
  }

  @Override
  public int compare(Long arg0, Long arg1) {
    return arg0.compareTo(arg1);
  }

  @Override
  public String toString() {
    return "LongSuccessor";
  }

}