core-it-support/core-it-plugins/maven-it-plugin-fork/src/main/java/org/apache/maven/plugin/coreit/TouchMojo.java

package org.apache.maven.plugin.coreit;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.project.MavenProject;

import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.StandardOpenOption;

/**
 * @goal touch
 * 
 * @phase process-sources
 */
public class TouchMojo
    extends AbstractMojo
{

    static final String FINAL_NAME = "coreitified";

    /**
     * @parameter default-value="${project}"
     */
    private MavenProject project;

    /**
     * @parameter default-value="${project.build.directory}"
     * @required
     */
    private File outputDirectory;

    public void execute()
        throws MojoExecutionException
    {
        getLog().info( "[MAVEN-CORE-IT-LOG] Project build directory " + project.getBuild().getDirectory() );

        touch( new File( project.getBuild().getDirectory() ), "touch.log" );

        getLog().info( "[MAVEN-CORE-IT-LOG] Using output directory " + outputDirectory );

        touch( outputDirectory, "touch.txt" );

        project.getBuild().setFinalName( FINAL_NAME );
    }

    static void touch( File dir, String file )
        throws MojoExecutionException
    {
        try
        {
             if ( !dir.exists() )
             {
                 dir.mkdirs();
             }
             
             File touch = new File( dir, file );
             if ( !Files.exists( touch.toPath() ) )
             {
                 Files.createFile( touch.toPath() );
             }

             // NOTE: Using append mode to track execution count
             try ( BufferedWriter w = Files.newBufferedWriter( touch.toPath(), Charset.forName( "UTF-8" ),
                                                              StandardOpenOption.APPEND ) )
             {
                 w.write( file );
                 w.write( "\n" );
             }

        }
        catch ( IOException e )
        {
            throw new MojoExecutionException( "Error touching file", e );
        }
    }

}