org.sonar.java.checks.ThreadStartedInConstructorCheck.java Source code

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Here is the source code for org.sonar.java.checks.ThreadStartedInConstructorCheck.java

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/*
 * SonarQube Java
 * Copyright (C) 2012-2017 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.apache.commons.lang.BooleanUtils;
import org.sonar.check.Rule;
import org.sonar.java.checks.helpers.MethodsHelper;
import org.sonar.java.matcher.MethodMatcher;
import org.sonar.plugins.java.api.IssuableSubscriptionVisitor;
import org.sonar.plugins.java.api.tree.ClassTree;
import org.sonar.plugins.java.api.tree.MethodInvocationTree;
import org.sonar.plugins.java.api.tree.Tree;
import org.sonar.plugins.java.api.tree.Tree.Kind;

import java.util.Deque;
import java.util.LinkedList;
import java.util.List;

@Rule(key = "S2693")
public class ThreadStartedInConstructorCheck extends IssuableSubscriptionVisitor {

    private static final MethodMatcher THREAD_START = MethodMatcher.create().typeDefinition("java.lang.Thread")
            .name("start").withoutParameter();

    private final Deque<Boolean> inMethodOrStaticInitializerOrFinalClass = new LinkedList<>();

    @Override
    public List<Kind> nodesToVisit() {
        return ImmutableList.of(Tree.Kind.CLASS, Tree.Kind.METHOD, Tree.Kind.METHOD_INVOCATION,
                Tree.Kind.STATIC_INITIALIZER);
    }

    @Override
    public void visitNode(Tree tree) {
        if (hasSemantic()) {
            if (tree.is(Tree.Kind.CLASS)) {
                inMethodOrStaticInitializerOrFinalClass.push(((ClassTree) tree).symbol().isFinal());
            } else if (tree.is(Tree.Kind.METHOD, Tree.Kind.STATIC_INITIALIZER)) {
                inMethodOrStaticInitializerOrFinalClass.push(Boolean.TRUE);
            } else if (BooleanUtils.isFalse(inMethodOrStaticInitializerOrFinalClass.peek())
                    && THREAD_START.matches((MethodInvocationTree) tree)) {
                reportIssue(MethodsHelper.methodName((MethodInvocationTree) tree),
                        "Move this \"start\" call to another method.");
            }
        }
    }

    @Override
    public void leaveNode(Tree tree) {
        if (hasSemantic() && tree.is(Tree.Kind.CLASS, Tree.Kind.METHOD, Tree.Kind.STATIC_INITIALIZER)) {
            inMethodOrStaticInitializerOrFinalClass.pop();
        }
    }

}