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/*
 *
 * 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;

import java.util.Calendar;
import java.util.Date;

/**
 * 
 * {@link DateSuccessor} generates a successor of any given Date. It's a singleton object.
 * 
 * @author Wei-Ming Wu
 * 
 */
public final class DateSuccessor implements Successive {

  private static final DateSuccessor INSTANCE = new DateSuccessor();

  private DateSuccessor() {}

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

  @Override
  public Date succ(Date curr) {
    Calendar c = Calendar.getInstance();
    c.setTime(curr);
    c.add(Calendar.DATE, 1);
    return c.getTime();
  }

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

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

}