/*
* SonarQube Java
* Copyright (C) 2012-2016 SonarSource SA
* mailto:contact 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.unused;
import com.google.common.collect.ImmutableList;
import org.sonar.check.Rule;
import org.sonar.java.resolve.SemanticModel;
import org.sonar.plugins.java.api.IssuableSubscriptionVisitor;
import org.sonar.plugins.java.api.JavaFileScannerContext;
import org.sonar.plugins.java.api.semantic.Symbol;
import org.sonar.plugins.java.api.tree.ClassTree;
import org.sonar.plugins.java.api.tree.MethodTree;
import org.sonar.plugins.java.api.tree.Tree;
import org.sonar.plugins.java.api.tree.TypeParameterTree;
import org.sonar.plugins.java.api.tree.TypeParameters;
import java.util.List;
@Rule(key = "S2326")
public class UnusedTypeParameterCheck extends IssuableSubscriptionVisitor {
private SemanticModel semanticModel;
@Override
public void scanFile(JavaFileScannerContext context) {
semanticModel = (SemanticModel) context.getSemanticModel();
super.scanFile(context);
}
@Override
public List<Tree.Kind> nodesToVisit() {
return ImmutableList.of(Tree.Kind.CLASS, Tree.Kind.INTERFACE, Tree.Kind.METHOD);
}
@Override
public void visitNode(Tree tree) {
if (hasSemantic()) {
TypeParameters typeParameters;
String messageEnd;
if (tree.is(Tree.Kind.METHOD)) {
typeParameters = ((MethodTree) tree).typeParameters();
messageEnd = "method.";
} else {
typeParameters = ((ClassTree) tree).typeParameters();
messageEnd = "class.";
if (tree.is(Tree.Kind.INTERFACE)) {
messageEnd = "interface.";
}
}
for (TypeParameterTree typeParameter : typeParameters) {
Symbol symbol = semanticModel.getSymbol(typeParameter);
if (symbol.usages().isEmpty()) {
String message = new StringBuilder(typeParameter.identifier().name())
.append(" is not used in the ")
.append(messageEnd).toString();
reportIssue(typeParameter.identifier(), message);
}
}
}
}
}