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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(BigDecimal.ROUND_UP),
/**
* Rounding mode where the values are rounded towards zero.
* Rule: {@code x.round().abs() <= x.abs()}
*/
DOWN(BigDecimal.ROUND_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(BigDecimal.ROUND_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(BigDecimal.ROUND_FLOOR),
/**
* Rounding mode where values are rounded towards the nearest neighbor. Ties
* are broken by rounding up.
*/
HALF_UP(BigDecimal.ROUND_HALF_UP),
/**
* Rounding mode where values are rounded towards the nearest neighbor. Ties
* are broken by rounding down.
*/
HALF_DOWN(BigDecimal.ROUND_HALF_DOWN),
/**
* Rounding mode where values are rounded towards the nearest neighbor. Ties
* are broken by rounding to the even neighbor.
*/
HALF_EVEN(BigDecimal.ROUND_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(BigDecimal.ROUND_UNNECESSARY);
/**
* Some constant char arrays for optimized comparisons
*/
private static final char[] chCEILING = {'C','E','I','L','I','N','G'};
private static final char[] chDOWN = {'D','O','W','N'};
private static final char[] chFLOOR = {'F','L','O','O','R'};
private static final char[] chHALF_DOWN = {'H','A','L','F','_','D','O','W','N'};
private static final char[] chHALF_EVEN = {'H','A','L','F','_','E','V','E','N'};
private static final char[] chHALF_UP = {'H','A','L','F','_','U','P'};
private static final char[] chUNNECESSARY = {'U','N','N','E','C','E','S','S','A','R','Y'};
private static final char[] chUP = {'U','P'};
/**
* 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"); //$NON-NLS-1$
}
}
/**
* Bypasses calls to the implicit valueOf(String) method, which will break
* if enum name obfuscation is enabled. This should be package visible only.
*
* @param mode rounding mode string as defined in class {@code BigDecimal}
* @return corresponding rounding mode object
*/
static RoundingMode valueOfExplicit(String mode) {
/*
* Note this is optimized to avoid multiple String compares,
* using specific knowledge of the set of allowed enum constants.
*/
if (mode == null) {
throw new NullPointerException();
}
char[] modeChars = mode.toCharArray();
int len = modeChars.length;
if (len < chUP.length || len > chUNNECESSARY.length) {
throw new IllegalArgumentException();
}
char[] targetChars = null;
RoundingMode target = null;
if (modeChars[0] == 'C') {
target = RoundingMode.CEILING;
targetChars = chCEILING;
} else if (modeChars[0] == 'D') {
target = RoundingMode.DOWN;
targetChars = chDOWN;
} else if (modeChars[0] == 'F') {
target = RoundingMode.FLOOR;
targetChars = chFLOOR;
} else if (modeChars[0] == 'H') {
if (len > 6) {
if (modeChars[5] == 'D') {
target = RoundingMode.HALF_DOWN;
targetChars = chHALF_DOWN;
} else if (modeChars[5] == 'E') {
target = RoundingMode.HALF_EVEN;
targetChars = chHALF_EVEN;
} else if (modeChars[5] == 'U') {
target = RoundingMode.HALF_UP;
targetChars = chHALF_UP;
}
}
} else if (modeChars[0] == 'U') {
if (modeChars[1] == 'P') {
target = RoundingMode.UP;
targetChars = chUP;
} else if (modeChars[1] == 'N') {
target = RoundingMode.UNNECESSARY;
targetChars = chUNNECESSARY;
}
}
if (target != null && len == targetChars.length) {
int i;
for (i = 1; i < len && modeChars[i] == targetChars[i]; i++) {
}
if (i == len) {
return target;
}
}
throw new IllegalArgumentException();
}
/**
* Set the old constant.
* @param rm unused
*/
RoundingMode(int rm) {
// Note that we do not need the old-style rounding mode, so we ignore it.
}
}
