org.sonar.plugins.checkstyle.CheckstyleExecutor.java Source code

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Here is the source code for org.sonar.plugins.checkstyle.CheckstyleExecutor.java

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/*
 * SonarQube Checkstyle Plugin
 * Copyright (C) 2012 SonarSource
 * sonarqube@googlegroups.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  02
 */
package org.sonar.plugins.checkstyle;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Lists;
import com.google.common.io.Closeables;
import com.puppycrawl.tools.checkstyle.Checker;
import com.puppycrawl.tools.checkstyle.PackageNamesLoader;
import com.puppycrawl.tools.checkstyle.XMLLogger;
import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.sonar.api.BatchExtension;
import org.sonar.api.utils.TimeProfiler;
import org.sonar.plugins.java.api.JavaResourceLocator;

import java.io.File;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Collection;
import java.util.List;
import java.util.Locale;

public class CheckstyleExecutor implements BatchExtension {
    private static final Logger LOG = LoggerFactory.getLogger(CheckstyleExecutor.class);

    private final CheckstyleConfiguration configuration;
    private final CheckstyleAuditListener listener;
    private final JavaResourceLocator javaResourceLocator;

    public CheckstyleExecutor(CheckstyleConfiguration configuration, CheckstyleAuditListener listener,
            JavaResourceLocator javaResourceLocator) {
        this.configuration = configuration;
        this.listener = listener;
        this.javaResourceLocator = javaResourceLocator;
    }

    /**
     * Execute Checkstyle and return the generated XML report.
     */
    public void execute() {
        TimeProfiler profiler = new TimeProfiler().start("Execute Checkstyle " + CheckstyleVersion.getVersion());
        ClassLoader initialClassLoader = Thread.currentThread().getContextClassLoader();
        Thread.currentThread().setContextClassLoader(PackageNamesLoader.class.getClassLoader());
        URLClassLoader projectClassloader = createClassloader();

        Locale initialLocale = Locale.getDefault();
        Locale.setDefault(Locale.ENGLISH);
        Checker checker = new Checker();
        OutputStream xmlOutput = null;
        try {
            checker.setClassLoader(projectClassloader);
            checker.setModuleClassLoader(Thread.currentThread().getContextClassLoader());
            checker.addListener(listener);

            File xmlReport = configuration.getTargetXMLReport();
            if (xmlReport != null) {
                LOG.info("Checkstyle output report: " + xmlReport.getAbsolutePath());
                xmlOutput = FileUtils.openOutputStream(xmlReport);
                checker.addListener(new XMLLogger(xmlOutput, true));
            }

            checker.setCharset(configuration.getCharset().name());
            checker.configure(configuration.getCheckstyleConfiguration());
            checker.process(configuration.getSourceFiles());

            profiler.stop();

        } catch (Exception e) {
            throw new IllegalStateException("Can not execute Checkstyle", e);
        } finally {
            checker.destroy();
            Closeables.closeQuietly(xmlOutput);
            Thread.currentThread().setContextClassLoader(initialClassLoader);
            Locale.setDefault(initialLocale);
            Closeables.closeQuietly(projectClassloader);
        }
    }

    @VisibleForTesting
    URL getURL(URI uri) {
        try {
            return uri.toURL();
        } catch (MalformedURLException e) {
            throw new IllegalStateException(
                    "Fail to create the project classloader. Classpath element is invalid: " + uri, e);
        }
    }

    private URLClassLoader createClassloader() {
        Collection<File> classpathElements = javaResourceLocator.classpath();
        List<URL> urls = Lists.newArrayList();
        for (File file : classpathElements) {
            urls.add(getURL(file.toURI()));
        }
        return new URLClassLoader(urls.toArray(new URL[urls.size()]), null);
    }

}