com.google.errorprone.bugpatterns.time.PeriodTimeMath 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.matchers.Matchers.allOf;
import static com.google.errorprone.matchers.Matchers.argument;
import static com.google.errorprone.matchers.Matchers.instanceMethod;
import static com.google.errorprone.matchers.Matchers.isSameType;
import static com.google.errorprone.matchers.Matchers.not;
import com.google.errorprone.BugPattern;
import com.google.errorprone.ErrorProneFlags;
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.sun.source.tree.ExpressionTree;
import com.sun.source.tree.MethodInvocationTree;
/** Bans calls to {@code Period#plus/minus(TemporalAmount)} where the argument is a Duration. */
@BugPattern(
name = "PeriodTimeMath",
summary = "When adding or subtracting from a Period, Duration is incompatible.",
explanation =
"Period.(plus|minus)(TemporalAmount) will always throw a DateTimeException when passed a "
+ "Duration.",
severity = ERROR)
public final class PeriodTimeMath extends BugChecker implements MethodInvocationTreeMatcher {
private final Matcher matcherToCheck;
private static final Matcher PERIOD_MATH =
instanceMethod().onExactClass("java.time.Period").namedAnyOf("plus", "minus");
private static final Matcher DURATION = isSameType("java.time.Duration");
private static final Matcher PERIOD = isSameType("java.time.Period");
public PeriodTimeMath(ErrorProneFlags flags) {
boolean requireStrictCompatibility =
flags.getBoolean("PeriodTimeMath:RequireStaticPeriodArgument").orElse(false);
matcherToCheck =
allOf(PERIOD_MATH, argument(0, requireStrictCompatibility ? not(PERIOD) : DURATION));
}
@Override
public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
return matcherToCheck.matches(tree, state) ? describeMatch(tree) : Description.NO_MATCH;
}
}