com.google.errorprone.bugpatterns.time.JodaPlusMinusLong 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.WARNING;
import com.google.common.collect.ImmutableSet;
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.fixes.SuggestedFix;
import com.google.errorprone.fixes.SuggestedFixes;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.matchers.Matcher;
import com.google.errorprone.matchers.Matchers;
import com.google.errorprone.matchers.method.MethodMatchers;
import com.google.errorprone.util.ASTHelpers;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.MethodInvocationTree;
import java.util.ArrayList;
import java.util.List;
/**
* Check for calls to JodaTime's {@code type.plus(long)} and {@code type.minus(long)} where {@code
* = {Duration,Instant,DateTime,DateMidnight}}.
*/
@BugPattern(
summary =
"Use of JodaTime's type.plus(long) or type.minus(long) is not allowed (where = "
+ "{Duration,Instant,DateTime,DateMidnight}). Please use "
+ "type.plus(Duration.millis(long)) or type.minus(Duration.millis(long)) instead.",
explanation =
"JodaTime's type.plus(long) and type.minus(long) methods are often a source of bugs "
+ "because the units of the parameters are ambiguous. Please use "
+ "type.plus(Duration.millis(long)) or type.minus(Duration.millis(long)) instead.",
severity = WARNING)
public final class JodaPlusMinusLong extends BugChecker implements MethodInvocationTreeMatcher {
private static final ImmutableSet TYPES =
ImmutableSet.of("DateMidnight", "DateTime", "Duration", "Instant");
private static final ImmutableSet METHODS = ImmutableSet.of("plus", "minus");
private static final Matcher MATCHER =
Matchers.allOf(
buildMatcher(),
// Allow usage by JodaTime itself
Matchers.not(Matchers.packageStartsWith("org.joda.time")));
private static final Matcher DURATION_GET_MILLIS_MATCHER =
MethodMatchers.instanceMethod()
.onDescendantOf("org.joda.time.ReadableDuration")
.named("getMillis");
private static Matcher buildMatcher() {
List> matchers = new ArrayList<>();
for (String type : TYPES) {
for (String method : METHODS) {
matchers.add(
Matchers.instanceMethod()
.onExactClass("org.joda.time." + type)
.named(method)
.withParameters("long"));
}
}
return Matchers.anyOf(matchers);
}
@Override
public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
if (!MATCHER.matches(tree, state)) {
return Description.NO_MATCH;
}
SuggestedFix.Builder builder = SuggestedFix.builder();
ExpressionTree firstArgumentTree = tree.getArguments().get(0);
String firstArgumentReplacement;
if (DURATION_GET_MILLIS_MATCHER.matches(firstArgumentTree, state)) {
// This is passing {@code someDuration.getMillis()} as the parameter. we can replace this
// with {@code someDuration}.
firstArgumentReplacement = state.getSourceForNode(ASTHelpers.getReceiver(firstArgumentTree));
} else {
// Wrap the long as a Duration.
firstArgumentReplacement =
SuggestedFixes.qualifyType(state, builder, "org.joda.time.Duration")
+ ".millis("
+ state.getSourceForNode(firstArgumentTree)
+ ")";
}
builder.replace(firstArgumentTree, firstArgumentReplacement);
return describeMatch(tree, builder.build());
}
}