com.google.errorprone.bugpatterns.inject.MisplacedScopeAnnotations Maven / Gradle / Ivy
/*
* Copyright 2016 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.inject;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static com.google.errorprone.matchers.ChildMultiMatcher.MatchType.AT_LEAST_ONE;
import static com.google.errorprone.matchers.InjectMatchers.IS_APPLICATION_OF_AT_INJECT;
import static com.google.errorprone.matchers.InjectMatchers.IS_BINDING_ANNOTATION;
import static com.google.errorprone.matchers.InjectMatchers.IS_SCOPING_ANNOTATION;
import static com.google.errorprone.matchers.InjectMatchers.hasProvidesAnnotation;
import static com.google.errorprone.matchers.Matchers.annotations;
import com.google.errorprone.BugPattern;
import com.google.errorprone.BugPattern.SeverityLevel;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker;
import com.google.errorprone.bugpatterns.BugChecker.MethodTreeMatcher;
import com.google.errorprone.bugpatterns.BugChecker.VariableTreeMatcher;
import com.google.errorprone.fixes.SuggestedFix;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.matchers.Matcher;
import com.google.errorprone.matchers.MultiMatcher;
import com.sun.source.tree.AnnotationTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.VariableTree;
import java.util.List;
/**
* Bug checker for when a scope annotation is used at injection site, which does not have any effect
* on the injected values.
*/
@BugPattern(
name = "MisplacedScopeAnnotations",
summary =
"Scope annotations used as qualifier annotations don't have any effect."
+ " Move the scope annotation to the binding location or delete it.",
severity = SeverityLevel.ERROR)
public class MisplacedScopeAnnotations extends BugChecker
implements MethodTreeMatcher, VariableTreeMatcher {
private static final MultiMatcher IS_SCOPE_ANNOTATION =
annotations(AT_LEAST_ONE, IS_SCOPING_ANNOTATION);
private static final MultiMatcher HAS_INJECT =
annotations(AT_LEAST_ONE, IS_APPLICATION_OF_AT_INJECT);
private static final Matcher HAS_PROVIDES = hasProvidesAnnotation();
@Override
public Description matchMethod(MethodTree tree, VisitorState state) {
if (!HAS_INJECT.matches(tree, state) && !HAS_PROVIDES.matches(tree, state)) {
return Description.NO_MATCH;
}
List scopeAnnotations =
tree.getParameters().stream()
.flatMap(
variable ->
IS_SCOPE_ANNOTATION.multiMatchResult(variable, state).matchingNodes().stream())
.filter(annotation -> !IS_BINDING_ANNOTATION.matches(annotation, state))
.collect(toImmutableList());
if (scopeAnnotations.isEmpty()) {
return Description.NO_MATCH;
}
return deleteAll(scopeAnnotations);
}
@Override
public Description matchVariable(VariableTree tree, VisitorState state) {
boolean hasInject =
tree.getModifiers().getAnnotations().stream()
.anyMatch(annotation -> IS_APPLICATION_OF_AT_INJECT.matches(annotation, state));
if (!hasInject) {
return Description.NO_MATCH;
}
List scopeAnnotations =
tree.getModifiers().getAnnotations().stream()
.filter(annotation -> IS_SCOPING_ANNOTATION.matches(annotation, state))
.filter(annotation -> !IS_BINDING_ANNOTATION.matches(annotation, state))
.collect(toImmutableList());
if (scopeAnnotations.isEmpty()) {
return Description.NO_MATCH;
}
return deleteAll(scopeAnnotations);
}
private Description deleteAll(List scopeAnnotations) {
SuggestedFix.Builder fixBuilder = SuggestedFix.builder();
scopeAnnotations.forEach(fixBuilder::delete);
return describeMatch(scopeAnnotations.get(0), fixBuilder.build());
}
}