/*
* 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;
import com.google.common.collect.ImmutableList;
import org.sonar.check.Rule;
import org.sonar.java.RspecKey;
import org.sonar.plugins.java.api.IssuableSubscriptionVisitor;
import org.sonar.plugins.java.api.semantic.Type;
import org.sonar.plugins.java.api.tree.ListTree;
import org.sonar.plugins.java.api.tree.MethodTree;
import org.sonar.plugins.java.api.tree.Tree;
import org.sonar.plugins.java.api.tree.TypeTree;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
@Rule(key = "RedundantThrowsDeclarationCheck")
@RspecKey("S1130")
public class RedundantThrowsDeclarationCheck extends IssuableSubscriptionVisitor {
@Override
public List<Tree.Kind> nodesToVisit() {
return ImmutableList.of(Tree.Kind.METHOD, Tree.Kind.CONSTRUCTOR);
}
@Override
public void visitNode(Tree tree) {
ListTree<TypeTree> thrownList = ((MethodTree) tree).throwsClauses();
Set<String> reported = new HashSet<>();
for (TypeTree typeTree : thrownList) {
Type symbolType = typeTree.symbolType();
String fullyQualifiedName = symbolType.fullyQualifiedName();
if (!reported.contains(fullyQualifiedName)) {
String superTypeName = isSubclassOfAny(symbolType, thrownList);
if (superTypeName != null) {
reportIssue(typeTree, "Remove the declaration of thrown exception '" + fullyQualifiedName + "' which is a subclass of '" + superTypeName + "'.");
} else if (symbolType.isSubtypeOf("java.lang.RuntimeException")) {
reportIssue(typeTree, "Remove the declaration of thrown exception '" + fullyQualifiedName + "' which is a runtime exception.");
} else if (declaredMoreThanOnce(fullyQualifiedName, thrownList)) {
reportIssue(typeTree, "Remove the redundant '" + fullyQualifiedName + "' thrown exception declaration(s).");
}
reported.add(fullyQualifiedName);
}
}
}
private static boolean declaredMoreThanOnce(String fullyQualifiedName, ListTree<TypeTree> thrown) {
boolean firstOccurrenceFound = false;
for (TypeTree typeTree : thrown) {
if (typeTree.symbolType().is(fullyQualifiedName)) {
if (firstOccurrenceFound) {
return true;
} else {
firstOccurrenceFound = true;
}
}
}
return false;
}
private static String isSubclassOfAny(Type type, ListTree<TypeTree> thrownList) {
for (TypeTree thrown : thrownList) {
String name = thrown.symbolType().fullyQualifiedName();
if (!type.is(name) && type.isSubtypeOf(name)) {
return name;
}
}
return null;
}
}