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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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 com.rapiddweller.common.operation;

import com.rapiddweller.common.ComparableComparator;
import com.rapiddweller.common.Operation;

import java.util.Comparator;

/**
 * Returns the minimum of two values. If a Comparaotr is provided, that one is used,
 * else it is assumed that E implements Comparable.
 * Created: 03.08.2007 07:40:14
 *
 * @param  the argument and result type of the operation
 * @author Volker Bergmann
 */
public class MinOperation implements Operation {

  private final Comparator comparator;

  /**
   * Instantiates a new Min operation.
   */
  @SuppressWarnings({"unchecked", "rawtypes"})
  public MinOperation() {
    this(new ComparableComparator());
  }

  /**
   * Instantiates a new Min operation.
   *
   * @param comparator the comparator
   */
  public MinOperation(Comparator comparator) {
    this.comparator = comparator;
  }

  @SafeVarargs
  @Override
  public final E perform(E... args) {
    if (args.length == 0) {
      return null;
    }
    E result = args[0];
    for (int i = 1; i < args.length; i++) {
      if (comparator.compare(result, args[i]) > 0) {
        result = args[i];
      }
    }
    return result;
  }

}