org.sonar.java.checks.WildcardImportsShouldNotBeUsedCheck Maven / Gradle / Ivy

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/*
 * 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.IdentifierTree;
import org.sonar.plugins.java.api.tree.ImportTree;
import org.sonar.plugins.java.api.tree.MemberSelectExpressionTree;
import org.sonar.plugins.java.api.tree.Tree;
import org.sonar.plugins.java.api.tree.Tree.Kind;

import java.util.List;

@Rule(key = "S2208")
public class WildcardImportsShouldNotBeUsedCheck extends IssuableSubscriptionVisitor {

  @Override
  public List nodesToVisit() {
    return ImmutableList.of(Tree.Kind.IMPORT);
  }

  @Override
  public void visitNode(Tree tree) {
    ImportTree importTree = (ImportTree) tree;

    // See RSPEC-2208 : exception with static imports.
    if (fullQualifiedName(importTree.qualifiedIdentifier()).endsWith(".*") && !importTree.isStatic()) {
      reportIssue(importTree.qualifiedIdentifier(), "Explicitly import the specific classes needed.");
    }
  }

  private static String fullQualifiedName(Tree tree) {
    if (tree.is(Tree.Kind.IDENTIFIER)) {
      return ((IdentifierTree) tree).name();
    } else if (tree.is(Tree.Kind.MEMBER_SELECT)) {
      MemberSelectExpressionTree m = (MemberSelectExpressionTree) tree;
      return fullQualifiedName(m.expression()) + "." + m.identifier().name();
    }
    throw new UnsupportedOperationException(String.format("Kind/Class '%s' not supported", tree.getClass()));
  }
}