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

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/*
 * SonarQube Java
 * Copyright (C) 2012 SonarSource
 * [email protected]
 *
 * 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  02
 */
package org.sonar.java.checks;

import com.google.common.collect.ImmutableList;
import org.sonar.api.server.rule.RulesDefinition;
import org.sonar.check.Priority;
import org.sonar.check.Rule;
import org.sonar.java.checks.methods.AbstractMethodDetection;
import org.sonar.java.checks.methods.MethodInvocationMatcherCollection;
import org.sonar.java.checks.methods.MethodMatcher;
import org.sonar.java.tag.Tag;
import org.sonar.plugins.java.api.tree.BaseTreeVisitor;
import org.sonar.plugins.java.api.tree.MemberSelectExpressionTree;
import org.sonar.plugins.java.api.tree.MethodInvocationTree;
import org.sonar.plugins.java.api.tree.Tree;
import org.sonar.squidbridge.annotations.ActivatedByDefault;
import org.sonar.squidbridge.annotations.SqaleConstantRemediation;
import org.sonar.squidbridge.annotations.SqaleSubCharacteristic;

import java.util.List;

@Rule(
  key = "S1872",
  name = "Classes should not be compared by name",
  priority = Priority.CRITICAL,
  tags = {Tag.BUG, Tag.CWE, Tag.SECURITY})
@ActivatedByDefault
@SqaleSubCharacteristic(RulesDefinition.SubCharacteristics.INSTRUCTION_RELIABILITY)
@SqaleConstantRemediation("5min")
public class ClassComparedByNameCheck extends AbstractMethodDetection {

  private ClassGetNameDetector classGetNameDetector = new ClassGetNameDetector();

  @Override
  protected List getMethodInvocationMatchers() {
    return ImmutableList.of(MethodMatcher.create().typeDefinition("java.lang.String").name("equals").withNoParameterConstraint());
  }

  @Override
  protected void onMethodInvocationFound(MethodInvocationTree mit) {
    if (mit.methodSelect().is(Tree.Kind.MEMBER_SELECT)) {
      ((MemberSelectExpressionTree) mit.methodSelect()).expression().accept(classGetNameDetector);
    }
    mit.arguments().get(0).accept(classGetNameDetector);
  }

  private class ClassGetNameDetector extends BaseTreeVisitor {

    private final MethodInvocationMatcherCollection methodMatchers = MethodInvocationMatcherCollection.create(
      MethodMatcher.create().typeDefinition("java.lang.Class").name("getName"),
      MethodMatcher.create().typeDefinition("java.lang.Class").name("getSimpleName"));

    @Override
    public void visitMethodInvocation(MethodInvocationTree tree) {
      if (methodMatchers.anyMatch(tree)) {
        addIssue(tree, "Use an \"instanceof\" comparison instead.");
      }
      scan(tree.methodSelect());
    }
  }
}