org.sonar.plugins.gosu.jacoco.JaCoCoReportMerger.java Source code

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Here is the source code for org.sonar.plugins.gosu.jacoco.JaCoCoReportMerger.java

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/*
 * Sonar Gosu Plugin
 * Copyright (C) 2016-2017 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.plugins.gosu.jacoco;

import org.apache.commons.lang.BooleanUtils;
import org.jacoco.core.data.ExecutionDataStore;
import org.jacoco.core.data.ExecutionDataWriter;
import org.jacoco.core.data.IExecutionDataVisitor;
import org.jacoco.core.data.ISessionInfoVisitor;
import org.jacoco.core.data.SessionInfoStore;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * Utility class to merge JaCoCo reports.
 *
 * This class handles two versions of JaCoCo binary format to merge.
 */
public class JaCoCoReportMerger {

    private JaCoCoReportMerger() {
    }

    /**
     * Merge all reports in reportOverall.
     * @param reportOverall destination file of merge.
     * @param reports files to be merged.
     */
    public static void mergeReports(File reportOverall, File... reports) {
        SessionInfoStore infoStore = new SessionInfoStore();
        ExecutionDataStore dataStore = new ExecutionDataStore();
        boolean isCurrentVersionFormat = loadSourceFiles(infoStore, dataStore, reports);

        try (BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(reportOverall))) {
            Object visitor;
            if (isCurrentVersionFormat) {
                visitor = new ExecutionDataWriter(outputStream);
            } else {
                visitor = new org.jacoco.previous.core.data.ExecutionDataWriter(outputStream);
            }
            infoStore.accept((ISessionInfoVisitor) visitor);
            dataStore.accept((IExecutionDataVisitor) visitor);
        } catch (IOException e) {
            throw new IllegalStateException(
                    String.format("Unable to write overall coverage report %s", reportOverall.getAbsolutePath()),
                    e);
        }
    }

    private static boolean loadSourceFiles(ISessionInfoVisitor infoStore, IExecutionDataVisitor dataStore,
            File... reports) {
        Boolean isCurrentVersionFormat = null;
        for (File report : reports) {
            if (report.isFile()) {
                JaCoCoReportReader jacocoReportReader = new JaCoCoReportReader(report).readJacocoReport(dataStore,
                        infoStore);
                boolean reportFormatIsCurrent = jacocoReportReader.useCurrentBinaryFormat();
                if (isCurrentVersionFormat == null) {
                    isCurrentVersionFormat = reportFormatIsCurrent;
                } else if (!isCurrentVersionFormat.equals(reportFormatIsCurrent)) {
                    throw new IllegalStateException(
                            "You are trying to merge two different JaCoCo binary formats. Please use only one version of JaCoCo.");
                }
            }
        }
        return BooleanUtils.isNotFalse(isCurrentVersionFormat);
    }

}