/
MathUtil.java
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/
MathUtil.java
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/*
* Copyright (c) 2014 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.
*/
package com.google.common.truth;
import static java.lang.Math.subtractExact;
import com.google.common.primitives.Doubles;
/** Math utilities to be shared by numeric subjects. */
final class MathUtil {
private MathUtil() {}
/**
* Returns true iff {@code left} and {@code right} are values within {@code tolerance} of each
* other.
*/
/* package */ static boolean equalWithinTolerance(long left, long right, long tolerance) {
try {
// subtractExact is always desugared.
@SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
long absDiff = Math.abs(subtractExact(left, right));
return 0 <= absDiff && absDiff <= Math.abs(tolerance);
} catch (ArithmeticException e) {
// The numbers are so far apart their difference isn't even a long.
return false;
}
}
/**
* Returns true iff {@code left} and {@code right} are values within {@code tolerance} of each
* other.
*/
/* package */ static boolean equalWithinTolerance(int left, int right, int tolerance) {
try {
// subtractExact is always desugared.
@SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
int absDiff = Math.abs(subtractExact(left, right));
return 0 <= absDiff && absDiff <= Math.abs(tolerance);
} catch (ArithmeticException e) {
// The numbers are so far apart their difference isn't even a int.
return false;
}
}
/**
* Returns true iff {@code left} and {@code right} are finite values within {@code tolerance} of
* each other. Note that both this method and {@link #notEqualWithinTolerance} returns false if
* either {@code left} or {@code right} is infinite or NaN.
*/
public static boolean equalWithinTolerance(double left, double right, double tolerance) {
return Math.abs(left - right) <= Math.abs(tolerance);
}
/**
* Returns true iff {@code left} and {@code right} are finite values within {@code tolerance} of
* each other. Note that both this method and {@link #notEqualWithinTolerance} returns false if
* either {@code left} or {@code right} is infinite or NaN.
*/
public static boolean equalWithinTolerance(float left, float right, float tolerance) {
return equalWithinTolerance((double) left, (double) right, (double) tolerance);
}
/**
* Returns true iff {@code left} and {@code right} are finite values not within {@code tolerance}
* of each other. Note that both this method and {@link #equalWithinTolerance} returns false if
* either {@code left} or {@code right} is infinite or NaN.
*/
public static boolean notEqualWithinTolerance(double left, double right, double tolerance) {
if (Doubles.isFinite(left) && Doubles.isFinite(right)) {
return Math.abs(left - right) > Math.abs(tolerance);
} else {
return false;
}
}
/**
* Returns true iff {@code left} and {@code right} are finite values not within {@code tolerance}
* of each other. Note that both this method and {@link #equalWithinTolerance} returns false if
* either {@code left} or {@code right} is infinite or NaN.
*/
public static boolean notEqualWithinTolerance(float left, float right, float tolerance) {
return notEqualWithinTolerance((double) left, (double) right, (double) tolerance);
}
}