com.google.errorprone.bugpatterns.DeadThread Maven / Gradle / Ivy
/*
* Copyright 2017 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;
import static com.google.errorprone.BugPattern.SeverityLevel.ERROR;
import static com.google.errorprone.matchers.Description.NO_MATCH;
import static com.google.errorprone.matchers.method.MethodMatchers.constructor;
import com.google.errorprone.BugPattern;
import com.google.errorprone.VisitorState;
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;
import com.sun.source.tree.Tree.Kind;
/** A {@link BugChecker}; see the associated {@link BugPattern} annotation for details. */
@BugPattern(summary = "Thread created but not started", severity = ERROR)
public class DeadThread extends BugChecker implements NewClassTreeMatcher {
private static final Matcher NEW_THREAD =
constructor().forClass("java.lang.Thread");
@Override
public Description matchNewClass(NewClassTree tree, VisitorState state) {
if (!NEW_THREAD.matches(tree, state)) {
return NO_MATCH;
}
if (state.getPath().getParentPath().getLeaf().getKind() != Kind.EXPRESSION_STATEMENT) {
return NO_MATCH;
}
return describeMatch(tree, SuggestedFix.postfixWith(tree, ".start()"));
}
}