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The JaCoCo Maven Plugin provides the JaCoCo runtime agent to your tests and allows basic report creation.

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/*******************************************************************************
 * Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *    Mads Mohr Christensen - implementation of MergeMojo
 *
 *******************************************************************************/
package org.jacoco.maven;

import java.io.File;
import java.io.IOException;
import java.util.List;

import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.LifecyclePhase;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.shared.model.fileset.FileSet;
import org.apache.maven.shared.model.fileset.util.FileSetManager;
import org.jacoco.core.tools.ExecFileLoader;

/**
 * Mojo for merging a set of execution data files (*.exec) into a single file
 *
 * @since 0.6.4
 */
@Mojo(name = "merge", defaultPhase = LifecyclePhase.GENERATE_RESOURCES, threadSafe = true)
public class MergeMojo extends AbstractJacocoMojo {

	private static final String MSG_SKIPPING = "Skipping JaCoCo merge execution due to missing execution data files";

	/**
	 * Path to the output file for execution data.
	 */
	@Parameter(property = "jacoco.destFile", defaultValue = "${project.build.directory}/jacoco.exec")
	private File destFile;

	/**
	 * This mojo accepts any number of execution data file sets.
	 *
	 * 
	 * 
	 * <fileSets>
	 *   <fileSet>
	 *     <directory>${project.build.directory}</directory>
	 *     <includes>
	 *       <include>*.exec</include>
	 *     </includes>
	 *   </fileSet>
	 * </fileSets>
	 * 
	 * 
*/ @Parameter(required = true) private List fileSets; @Override protected void executeMojo() throws MojoExecutionException, MojoFailureException { if (!canMergeReports()) { return; } executeMerge(); } private boolean canMergeReports() { if (fileSets == null || fileSets.isEmpty()) { getLog().info(MSG_SKIPPING); return false; } return true; } private void executeMerge() throws MojoExecutionException { final ExecFileLoader loader = new ExecFileLoader(); load(loader); save(loader); } private void load(final ExecFileLoader loader) throws MojoExecutionException { final FileSetManager fileSetManager = new FileSetManager(getLog()); for (final FileSet fileSet : fileSets) { for (final String includedFilename : fileSetManager .getIncludedFiles(fileSet)) { final File inputFile = new File(fileSet.getDirectory(), includedFilename); if (inputFile.isDirectory()) { continue; } try { getLog().info("Loading execution data file " + inputFile.getAbsolutePath()); loader.load(inputFile); } catch (final IOException e) { throw new MojoExecutionException( "Unable to read " + inputFile.getAbsolutePath(), e); } } } } private void save(final ExecFileLoader loader) throws MojoExecutionException { if (loader.getExecutionDataStore().getContents().isEmpty()) { getLog().info(MSG_SKIPPING); return; } getLog().info("Writing merged execution data to " + destFile.getAbsolutePath()); try { loader.save(destFile, false); } catch (final IOException e) { throw new MojoExecutionException( "Unable to write merged file " + destFile.getAbsolutePath(), e); } } }




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