com.google.errorprone.bugpatterns.time.PeriodGetTemporalUnit Maven / Gradle / Ivy
/*
* Copyright 2018 The Error Prone Authors.
*
* 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.errorprone.bugpatterns.time;
import static com.google.errorprone.BugPattern.SeverityLevel.ERROR;
import static com.google.errorprone.bugpatterns.time.DurationGetTemporalUnit.getInvalidChronoUnit;
import com.google.common.collect.Iterables;
import com.google.errorprone.BugPattern;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker;
import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.matchers.Matcher;
import com.google.errorprone.matchers.Matchers;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.MethodInvocationTree;
import java.time.temporal.ChronoUnit;
import java.util.EnumSet;
/**
* Bans calls to {@code Period.get(temporalUnit)} where {@code temporalUnit} is not {@code YEARS},
* {@code MONTHS}, or {@code DAYS}.
*/
@BugPattern(
name = "PeriodGetTemporalUnit",
summary = "Period.get() only works with YEARS, MONTHS, or DAYS.",
explanation =
"`Period.get(TemporalUnit)` only works when passed `ChronoUnit.YEARS`, `ChronoUnit.MONTHS`,"
+ " or `ChronoUnit.DAYS`. All other values are guaranteed to throw an"
+ " `UnsupportedTemporalTypeException`.",
severity = ERROR)
public final class PeriodGetTemporalUnit extends BugChecker implements MethodInvocationTreeMatcher {
private static final EnumSet INVALID_TEMPORAL_UNITS =
EnumSet.complementOf(EnumSet.of(ChronoUnit.YEARS, ChronoUnit.MONTHS, ChronoUnit.DAYS));
private static final Matcher MATCHER =
Matchers.instanceMethod()
.onExactClass("java.time.Period")
.named("get")
.withParameters("java.time.temporal.TemporalUnit");
@Override
public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
return MATCHER.matches(tree, state)
&& getInvalidChronoUnit(
Iterables.getOnlyElement(tree.getArguments()), INVALID_TEMPORAL_UNITS)
.isPresent()
? describeMatch(tree)
: Description.NO_MATCH;
}
}