org.sonar.java.checks.EmptyClassCheck Maven / Gradle / Ivy
/*
* SonarQube Java
* Copyright (C) 2012-2018 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.java.checks;
import com.google.common.collect.ImmutableList;
import org.sonar.check.Rule;
import org.sonar.plugins.java.api.IssuableSubscriptionVisitor;
import org.sonar.plugins.java.api.tree.ClassTree;
import org.sonar.plugins.java.api.tree.IdentifierTree;
import org.sonar.plugins.java.api.tree.Tree;
import java.util.List;
@Rule(key = "S2094")
public class EmptyClassCheck extends IssuableSubscriptionVisitor {
@Override
public List nodesToVisit() {
return ImmutableList.of(Tree.Kind.CLASS);
}
@Override
public void visitNode(Tree tree) {
ClassTree classTree = (ClassTree) tree;
IdentifierTree simpleName = classTree.simpleName();
if (simpleName != null && isNotExtending(classTree) && isEmpty(classTree)) {
reportIssue(simpleName, "Remove this empty class, write its code or make it an \"interface\".");
}
}
private static boolean isNotExtending(ClassTree tree) {
return tree.superClass() == null && tree.superInterfaces().isEmpty();
}
private static boolean isEmpty(ClassTree tree) {
return tree.modifiers().annotations().isEmpty() && tree.members().stream().allMatch(member -> member.is(Tree.Kind.EMPTY_STATEMENT));
}
}
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