core-it-support/core-it-plugins/maven-it-plugin-touch/src/main/java/org/apache/maven/plugin/coreit/CopyPomMojo.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 java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * Mojo which makes a copy of the POM using MavenProject.getFile() to locate the file.
 *
 * @goal copy-pom
 * @phase generate-sources
 */
public class CopyPomMojo
    extends AbstractMojo
{
    /**
     * @parameter default-value="${project.file}"
     */
    private File pomFile;

    /**
     * @parameter default-value="${project.build.directory}/pom-copy.xml"
     * @required
     */
    private String outputFile;

    public void execute()
        throws MojoExecutionException
    {
        try
        {
            File dest = new File( outputFile );
            File dir = dest.getParentFile();

            if ( !dir.exists() )
            {
                dir.mkdirs();
            }

            getLog().info( "Copying POM to file: " + dest.getAbsolutePath() );

            try ( FileInputStream in = new FileInputStream( pomFile );
                  FileOutputStream out = new FileOutputStream( dest ) )
            {
                int read = -1;
                byte[] buf = new byte[4 * 1024];
                while ( ( read = in.read( buf ) ) > -1 )
                {
                    out.write( buf, 0, read );
                }
            }
        }
        catch ( IOException e )
        {
            throw new MojoExecutionException( "Error copying POM", e );
        }
    }
}