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/*
 * Copyright 2009 Google Inc.
 * 
 * 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.
 */

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with this
 * work for additional information regarding copyright ownership. The ASF
 * licenses this file to You 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.
 * 
 * INCLUDES MODIFICATIONS BY RICHARD ZSCHECH AS WELL AS GOOGLE.
 */
package java.math;

/**
 * Specifies the rounding behavior for operations whose results cannot be
 * represented exactly.
 */
public enum RoundingMode {

  /**
   * Rounding mode where positive values are rounded towards positive infinity
   * and negative values towards negative infinity. 
* Rule: {@code x.round().abs() >= x.abs()} */ UP, /** * Rounding mode where the values are rounded towards zero.
* Rule: {@code x.round().abs() <= x.abs()} */ DOWN, /** * Rounding mode to round towards positive infinity. For positive values this * rounding mode behaves as {@link #UP}, for negative values as {@link #DOWN}.
* Rule: {@code x.round() >= x} */ CEILING, /** * Rounding mode to round towards negative infinity. For positive values this * rounding mode behaves as {@link #DOWN}, for negative values as {@link #UP}.
* Rule: {@code x.round() <= x} */ FLOOR, /** * Rounding mode where values are rounded towards the nearest neighbor. Ties * are broken by rounding up. */ HALF_UP, /** * Rounding mode where values are rounded towards the nearest neighbor. Ties * are broken by rounding down. */ HALF_DOWN, /** * Rounding mode where values are rounded towards the nearest neighbor. Ties * are broken by rounding to the even neighbor. */ HALF_EVEN, /** * Rounding mode where the rounding operations throws an ArithmeticException * for the case that rounding is necessary, i.e. for the case that the value * cannot be represented exactly. */ UNNECESSARY; /** * Converts rounding mode constants from class {@code BigDecimal} into {@code * RoundingMode} values. * * @param mode rounding mode constant as defined in class {@code BigDecimal} * @return corresponding rounding mode object */ public static RoundingMode valueOf(int mode) { switch (mode) { case BigDecimal.ROUND_CEILING: return CEILING; case BigDecimal.ROUND_DOWN: return DOWN; case BigDecimal.ROUND_FLOOR: return FLOOR; case BigDecimal.ROUND_HALF_DOWN: return HALF_DOWN; case BigDecimal.ROUND_HALF_EVEN: return HALF_EVEN; case BigDecimal.ROUND_HALF_UP: return HALF_UP; case BigDecimal.ROUND_UNNECESSARY: return UNNECESSARY; case BigDecimal.ROUND_UP: return UP; default: // math.00=Invalid rounding mode throw new IllegalArgumentException("Invalid rounding mode"); } } }




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