com.google.errorprone.bugpatterns.EmptyTopLevelDeclaration Maven / Gradle / Ivy
/*
* Copyright 2015 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.WARNING;
import com.google.errorprone.BugPattern;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker.CompilationUnitTreeMatcher;
import com.google.errorprone.fixes.SuggestedFix;
import com.google.errorprone.matchers.Description;
import com.sun.source.tree.CompilationUnitTree;
import com.sun.source.tree.Tree;
import java.util.ArrayList;
import java.util.List;
/** A {@link BugChecker}; see the associated {@link BugPattern} annotation for details. */
@BugPattern(
name = "EmptyTopLevelDeclaration",
summary = "Empty top-level type declaration",
severity = WARNING)
public class EmptyTopLevelDeclaration extends BugChecker implements CompilationUnitTreeMatcher {
@Override
public Description matchCompilationUnit(CompilationUnitTree tree, VisitorState state) {
List toDelete = new ArrayList<>();
for (Tree member : tree.getTypeDecls()) {
if (member.getKind() == Tree.Kind.EMPTY_STATEMENT) {
toDelete.add(member);
}
}
if (toDelete.isEmpty()) {
return Description.NO_MATCH;
}
SuggestedFix.Builder fixBuilder = SuggestedFix.builder();
for (Tree member : toDelete) {
fixBuilder.delete(member);
}
return describeMatch(toDelete.get(0), fixBuilder.build());
}
}