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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.condition;

import com.rapiddweller.common.ComparableComparator;
import com.rapiddweller.common.Condition;

import java.util.Comparator;

/**
 * Condition implementation that compares an arbitrary number of arguments
 * with one of different available operators.
 * Created: 06.03.2006 17:49:06
 *
 * @param  the type of argument to evaluate
 * @author Volker Bergmann
 * @since 0.1
 */
public class ComparationCondition implements Condition {

  /**
   * The constant EQUAL.
   */
  public static final int EQUAL = 0;
  /**
   * The constant NOT_EQUAL.
   */
  public static final int NOT_EQUAL = 1;
  /**
   * The constant GREATER_OR_EQUAL.
   */
  public static final int GREATER_OR_EQUAL = 2;
  /**
   * The constant GREATER.
   */
  public static final int GREATER = 3;
  /**
   * The constant LESS_OR_EQUAL.
   */
  public static final int LESS_OR_EQUAL = 4;
  /**
   * The constant LESS.
   */
  public static final int LESS = 5;

  private int operator;
  private Comparator comparator;

  /**
   * Instantiates a new Comparation condition.
   */
  public ComparationCondition() {
    this(EQUAL);
  }

  /**
   * Instantiates a new Comparation condition.
   *
   * @param operator the operator
   */
  @SuppressWarnings({"unchecked", "rawtypes"})
  public ComparationCondition(int operator) {
    this(operator, new ComparableComparator());
  }

  /**
   * Instantiates a new Comparation condition.
   *
   * @param operator   the operator
   * @param comparator the comparator
   */
  public ComparationCondition(int operator, Comparator comparator) {
    this.operator = operator;
    this.comparator = comparator;
  }

  /**
   * Gets operator.
   *
   * @return the operator
   */
  public int getOperator() {
    return operator;
  }

  /**
   * Sets operator.
   *
   * @param operator the operator
   */
  public void setOperator(int operator) {
    this.operator = operator;
  }

  /**
   * Gets comparator.
   *
   * @return the comparator
   */
  public Comparator getComparator() {
    return comparator;
  }

  /**
   * Sets comparator.
   *
   * @param comparator the comparator
   */
  public void setComparator(Comparator comparator) {
    this.comparator = comparator;
  }

  @Override
  public boolean evaluate(E[] arguments) {
    if (arguments.length != 2) {
      throw new IllegalArgumentException("Comparation only supported for two arguments, found: "
          + arguments.length);
    }
    int comparation = comparator.compare(arguments[0], arguments[1]);
    switch (operator) {
      case EQUAL:
        return comparation == 0;
      case NOT_EQUAL:
        return comparation != 0;
      case GREATER_OR_EQUAL:
        return comparation >= 0;
      case GREATER:
        return comparation == 1;
      case LESS_OR_EQUAL:
        return comparation <= 0;
      case LESS:
        return comparation == -1;
      default:
        throw new IllegalStateException("Operator no supported: " + operator);
    }
  }
}