com.google.errorprone.bugpatterns.inlineme.Suggester Maven / Gradle / Ivy
/*
* Copyright 2021 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.inlineme;
import static com.google.errorprone.BugPattern.SeverityLevel.WARNING;
import static com.google.errorprone.util.ASTHelpers.hasAnnotation;
import com.google.errorprone.BugPattern;
import com.google.errorprone.ErrorProneFlags;
import com.google.errorprone.VisitorState;
import com.google.errorprone.annotations.DoNotCall;
import com.google.errorprone.bugpatterns.BugChecker;
import com.google.errorprone.bugpatterns.BugChecker.MethodTreeMatcher;
import com.google.errorprone.bugpatterns.inlineme.InlinabilityResult.InlineValidationErrorReason;
import com.google.errorprone.fixes.SuggestedFix;
import com.google.errorprone.fixes.SuggestedFixes;
import com.google.errorprone.matchers.Description;
import com.sun.source.tree.MethodTree;
import javax.lang.model.element.Modifier;
/** Checker that recommends using {@code @InlineMe} on single-statement deprecated APIs. */
@BugPattern(
name = "InlineMeSuggester",
summary =
"This deprecated API looks inlineable. If you'd like the body of the API to be inlined to"
+ " its callers, please annotate it with @InlineMe.",
severity = WARNING)
public final class Suggester extends BugChecker implements MethodTreeMatcher {
private final String inlineMe;
public Suggester(ErrorProneFlags errorProneFlags) {
inlineMe =
errorProneFlags
.get("InlineMe:annotation")
.orElse("com.google.errorprone.annotations.InlineMe");
}
@Override
public Description matchMethod(MethodTree tree, VisitorState state) {
// only suggest @InlineMe on @Deprecated APIs
if (!hasAnnotation(tree, Deprecated.class, state)) {
return Description.NO_MATCH;
}
// if the API is already annotated with @InlineMe, then return no match
if (hasAnnotation(tree, inlineMe, state)) {
return Description.NO_MATCH;
}
// if the API is already annotated with @DoNotCall, then return no match
if (hasAnnotation(tree, DoNotCall.class, state)) {
return Description.NO_MATCH;
}
// if the body is not inlineable, then return no match
InlinabilityResult inlinabilityResult = InlinabilityResult.forMethod(tree, state);
if (!inlinabilityResult.isValidForSuggester()) {
return Description.NO_MATCH;
}
// We attempt to actually build the annotation as a SuggestedFix.
SuggestedFix.Builder fixBuilder =
SuggestedFix.builder()
.addImport(inlineMe)
.prefixWith(
tree,
InlineMeData.buildExpectedInlineMeAnnotation(state, inlinabilityResult.body())
.buildAnnotation());
if (inlinabilityResult.error()
== InlineValidationErrorReason.METHOD_CAN_BE_OVERIDDEN_BUT_CAN_BE_FIXED) {
SuggestedFixes.addModifiers(tree, state, Modifier.FINAL).ifPresent(fixBuilder::merge);
}
return describeMatch(tree, fixBuilder.build());
}
}