com.google.errorprone.bugpatterns.time.JodaConstructors 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.
*/
package com.google.errorprone.bugpatterns.time;
import static com.google.errorprone.BugPattern.SeverityLevel.WARNING;
import static com.google.errorprone.matchers.Matchers.anyOf;
import static com.google.errorprone.matchers.Matchers.constructor;
import static com.google.errorprone.matchers.Matchers.packageStartsWith;
import static com.google.errorprone.util.ASTHelpers.getStartPosition;
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.NewClassTreeMatcher;
import com.google.errorprone.fixes.SuggestedFix;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.matchers.Matcher;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.NewClassTree;
/**
* Check for calls to bad JodaTime constructors.
*
*
* - {@code org.joda.time.Duration#Duration(long)}
*
- {@code org.joda.time.Instant#Instant()}
*
- {@code org.joda.time.DateTime#DateTime()}
*
- {@code org.joda.time.DateTime#DateTime(org.joda.time.Chronology)}
*
- {@code org.joda.time.DateTime#DateTime(org.joda.time.DateTimeZone)}
*
*/
@BugPattern(
name = "JodaConstructors",
summary = "Use of certain JodaTime constructors are not allowed.",
explanation = "Use JodaTime's static factories instead of the ambiguous constructors.",
severity = WARNING)
public final class JodaConstructors extends BugChecker implements NewClassTreeMatcher {
private static final Matcher SELF_USAGE = packageStartsWith("org.joda.time");
private static final Matcher DURATION_CTOR =
constructor().forClass("org.joda.time.Duration").withParameters("long");
private static final Matcher INSTANT_CTOR =
constructor().forClass("org.joda.time.Instant").withNoParameters();
private static final Matcher DATE_TIME_CTORS =
anyOf(
constructor().forClass("org.joda.time.DateTime").withNoParameters(),
constructor()
.forClass("org.joda.time.DateTime")
.withParameters("org.joda.time.Chronology"),
constructor()
.forClass("org.joda.time.DateTime")
.withParameters("org.joda.time.DateTimeZone"));
@Override
public Description matchNewClass(NewClassTree tree, VisitorState state) {
// Allow usage by JodaTime itself
if (SELF_USAGE.matches(tree, state)) {
return Description.NO_MATCH;
}
// ban new Duration(long)
if (DURATION_CTOR.matches(tree, state)) {
ExpressionTree millisArg = Iterables.getOnlyElement(tree.getArguments());
SuggestedFix fix =
SuggestedFix.replace(
getStartPosition(tree),
getStartPosition(millisArg),
state.getSourceForNode(tree.getIdentifier()) + ".millis(");
return describeMatch(tree, fix);
}
// ban new Instant()
if (INSTANT_CTOR.matches(tree, state)) {
SuggestedFix fix =
SuggestedFix.replace(tree, state.getSourceForNode(tree.getIdentifier()) + ".now()");
return describeMatch(tree, fix);
}
// ban new DateTime(), new DateTime(DateTimeZone), and new DateTime(Chronology)
if (DATE_TIME_CTORS.matches(tree, state)) {
if (tree.getArguments().isEmpty()) {
SuggestedFix fix =
SuggestedFix.replace(tree, state.getSourceForNode(tree.getIdentifier()) + ".now()");
return describeMatch(tree, fix);
} else {
ExpressionTree arg = Iterables.getOnlyElement(tree.getArguments());
SuggestedFix fix =
SuggestedFix.replace(
getStartPosition(tree),
getStartPosition(arg),
state.getSourceForNode(tree.getIdentifier()) + ".now(");
return describeMatch(tree, fix);
}
}
// otherwise, no match
return Description.NO_MATCH;
}
}