/
IntegerSubject.java
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/
IntegerSubject.java
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/*
* Copyright (c) 2011 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 com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.truth.Fact.fact;
import static com.google.common.truth.MathUtil.equalWithinTolerance;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Propositions for {@link Integer} subjects.
*
* @author David Saff
* @author Christian Gruber (cgruber@israfil.net)
* @author Kurt Alfred Kluever
*/
public class IntegerSubject extends ComparableSubject<Integer> {
private final @Nullable Integer actual;
/**
* Constructor for use by subclasses. If you want to create an instance of this class itself, call
* {@link Subject#check(String, Object...) check(...)}{@code .that(actual)}.
*/
protected IntegerSubject(FailureMetadata metadata, @Nullable Integer actual) {
super(metadata, actual);
this.actual = actual;
}
/**
* A partially specified check about an approximate relationship to a {@code int} subject using a
* tolerance.
*
* @since 1.2
*/
public abstract static class TolerantIntegerComparison {
// Prevent subclassing outside of this class
private TolerantIntegerComparison() {}
/**
* Fails if the subject was expected to be within the tolerance of the given value but was not
* <i>or</i> if it was expected <i>not</i> to be within the tolerance but was. The subject and
* tolerance are specified earlier in the fluent call chain.
*/
public abstract void of(int expectedInteger);
/**
* @throws UnsupportedOperationException always
* @deprecated {@link Object#equals(Object)} is not supported on TolerantIntegerComparison. If
* you meant to compare ints, use {@link #of(int)} instead.
*/
@Deprecated
@Override
public boolean equals(@Nullable Object o) {
throw new UnsupportedOperationException(
"If you meant to compare ints, use .of(int) instead.");
}
/**
* @throws UnsupportedOperationException always
* @deprecated {@link Object#hashCode()} is not supported on TolerantIntegerComparison
*/
@Deprecated
@Override
public int hashCode() {
throw new UnsupportedOperationException("Subject.hashCode() is not supported.");
}
}
/**
* Prepares for a check that the subject is a number within the given tolerance of an expected
* value that will be provided in the next call in the fluent chain.
*
* @param tolerance an inclusive upper bound on the difference between the subject and object
* allowed by the check, which must be a non-negative value.
* @since 1.2
*/
public TolerantIntegerComparison isWithin(int tolerance) {
return new TolerantIntegerComparison() {
@Override
public void of(int expected) {
Integer actual = IntegerSubject.this.actual;
checkNotNull(
actual, "actual value cannot be null. tolerance=%s expected=%s", tolerance, expected);
checkTolerance(tolerance);
if (!equalWithinTolerance(actual, expected, tolerance)) {
failWithoutActual(
fact("expected", Integer.toString(expected)),
butWas(),
fact("outside tolerance", Integer.toString(tolerance)));
}
}
};
}
/**
* Prepares for a check that the subject is a number not within the given tolerance of an expected
* value that will be provided in the next call in the fluent chain.
*
* @param tolerance an exclusive lower bound on the difference between the subject and object
* allowed by the check, which must be a non-negative value.
* @since 1.2
*/
public TolerantIntegerComparison isNotWithin(int tolerance) {
return new TolerantIntegerComparison() {
@Override
public void of(int expected) {
Integer actual = IntegerSubject.this.actual;
checkNotNull(
actual, "actual value cannot be null. tolerance=%s expected=%s", tolerance, expected);
checkTolerance(tolerance);
if (equalWithinTolerance(actual, expected, tolerance)) {
failWithoutActual(
fact("expected not to be", Integer.toString(expected)),
butWas(),
fact("within tolerance", Integer.toString(tolerance)));
}
}
};
}
/**
* @deprecated Use {@link #isEqualTo} instead. Integer comparison is consistent with equality.
*/
@Override
@Deprecated
public final void isEquivalentAccordingToCompareTo(@Nullable Integer other) {
super.isEquivalentAccordingToCompareTo(other);
}
/** Ensures that the given tolerance is a non-negative value. */
private static void checkTolerance(int tolerance) {
checkArgument(tolerance >= 0, "tolerance (%s) cannot be negative", tolerance);
}
}