package org.codehaus.mojo.wagon;
   
   /*
    * 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.MojoExecutionException;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.wagon.Wagon;
  import org.apache.maven.wagon.WagonException;
  import org.codehaus.plexus.util.StringUtils;
  
  import java.io.File;
  
  /**
   * Download a single file.
   */
  @Mojo( name = "download-single", requiresProject = false)
  public class DownloadSingleMojo
      extends AbstractSingleWagonMojo
  {
      /**
       * Relative path to the base URL. When empty, assume base URL has the full path
       */
      @Parameter( property = "wagon.fromFile")
      private String fromFile;
  
      /**
       * Directory to download the remote file to.
       */
      @Parameter( property = "wagon.toDir")
      private File toDir;
  
      /**
       * File to download the remote file to. Use this option to rename the file after download. When toDir is present,
       * this argument is ignored.
       */
      @Parameter( property = "wagon.toFile")
      private File toFile;
  
      /**
       * Skip download if local file already exists.
       */
      @Parameter( property = "wagon.skipIfExists")
      private boolean skipIfExists;
  
      @Override
      protected void execute( Wagon wagon )
          throws MojoExecutionException, WagonException
      {
  
          if ( this.skip )
          {
              this.getLog().info( "Skip execution." );
              return;
          }
  
          if ( toDir != null )
          {
              toFile = new File( toDir, new File( fromFile ).getName() );
          }
  
          if ( toFile == null )
          {
              throw new MojoExecutionException( "Either toDir or toFile is required" );
          }
  
          if ( skipIfExists && toFile.exists() )
          {
              getLog().info("Skip execution - file " + toFile + " already exists." );
              return;
          }
          this.getLog().info( "Downloading: " + wagon.getRepository().getUrl() + "/" + fromFile + " to " + toFile );
  
          wagon.get( fromFile, toFile );
  
      }
  
      @Override
      public void execute()
          throws MojoExecutionException
      {
          if ( StringUtils.isBlank( this.fromFile ) ) {
 
             //recompute base url and fromFile
             String [] tokens = StringUtils.split( this.url, "/\\" );
             this.fromFile = tokens[tokens.length - 1];
             this.url = url.substring( 0, url.length() - this.fromFile.length() - 1 );
         }
 
         super.execute();
     }
 }