content: /*******************************************************************************
   * Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
   * All rights reserved. This program and the accompanying materials
   * are made available under the terms of the Eclipse Public License v1.0
   * which accompanies this distribution, and is available at
   * http://www.eclipse.org/legal/epl-v10.html
   *
   * Contributors:
   *    Marc R. Hoffmann - initial API and implementation
   *
   *******************************************************************************/
  package org.jacoco.cli.internal.commands;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.PrintWriter;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.jacoco.cli.internal.Command;
  import org.jacoco.core.tools.ExecFileLoader;
  import org.kohsuke.args4j.Argument;
  import org.kohsuke.args4j.Option;
  
  /**
   * The <code>merge</code> command.
   */
  public class Merge extends Command {
  
  	@Argument(usage = "list of JaCoCo *.exec files to read", metaVar = "<execfiles>")
  	List<File> execfiles = new ArrayList<File>();
  
  	@Option(name = "--destfile", usage = "file to write merged execution data to", metaVar = "<path>", required = true)
  	File destfile;
  
  	@Override
  	public String description() {
  		return "Merges multiple exec files into a new one.";
  	}
  
  	@Override
  	public int execute(final PrintWriter out, final PrintWriter err)
  			throws IOException {
  		final ExecFileLoader loader = loadExecutionData(out);
  		out.printf("[INFO] Writing execution data to %s.%n",
  				destfile.getAbsolutePath());
  		loader.save(destfile, true);
  		return 0;
  	}
  
  	private ExecFileLoader loadExecutionData(final PrintWriter out)
  			throws IOException {
  		final ExecFileLoader loader = new ExecFileLoader();
  		if (execfiles.isEmpty()) {
  			out.println("[WARN] No execution data files provided.");
  		} else {
  			for (final File file : execfiles) {
  				out.printf("[INFO] Loading execution data file %s.%n",
  						file.getAbsolutePath());
  				loader.load(file);
  			}
  		}
  		return loader;
  	}
  
  }
  