com.google.errorprone.bugpatterns.JavaUtilDateChecker Maven / Gradle / Ivy
/*
* Copyright 2020 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.
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package com.google.errorprone.bugpatterns;
import static com.google.errorprone.BugPattern.SeverityLevel.WARNING;
import static com.google.errorprone.matchers.Description.NO_MATCH;
import static com.google.errorprone.matchers.Matchers.anyOf;
import static com.google.errorprone.matchers.method.MethodMatchers.instanceMethod;
import static com.google.errorprone.matchers.method.MethodMatchers.staticMethod;
import com.google.errorprone.BugPattern;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
import com.google.errorprone.bugpatterns.BugChecker.NewClassTreeMatcher;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.matchers.Matcher;
import com.google.errorprone.suppliers.Supplier;
import com.google.errorprone.util.ASTHelpers;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.MethodInvocationTree;
import com.sun.source.tree.NewClassTree;
import com.sun.tools.javac.code.Type;
/** A {@link BugChecker}; see the associated {@link BugPattern} annotation for details. */
@BugPattern(
name = "JavaUtilDate",
summary = "Date has a bad API that leads to bugs; prefer java.time.Instant or LocalDate.",
severity = WARNING)
public class JavaUtilDateChecker extends BugChecker
implements MethodInvocationTreeMatcher, NewClassTreeMatcher {
private static final Matcher EXEMPTIONS =
anyOf(
instanceMethod().onExactClass("java.util.Date").named("toInstant"),
staticMethod()
.onClass("java.util.Date")
.named("from")
.withParameters("java.time.Instant"));
@Override
public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
if (!isDate(state, ASTHelpers.getReceiverType(tree))) {
return NO_MATCH;
}
if (EXEMPTIONS.matches(tree, state)) {
return NO_MATCH;
}
return describeMatch(tree);
}
@Override
public Description matchNewClass(NewClassTree tree, VisitorState state) {
return isDate(state, ASTHelpers.getType(tree.getIdentifier())) ? describeMatch(tree) : NO_MATCH;
}
private static boolean isDate(VisitorState state, Type type) {
return ASTHelpers.isSameType(type, JAVA_UTIL_DATE.get(state), state);
}
private static final Supplier JAVA_UTIL_DATE =
VisitorState.memoize(state -> state.getTypeFromString("java.util.Date"));
}