package org.apache.maven.it;
   
   /*
    * 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 java.io.File;
  import java.io.FileWriter;
  import java.io.IOException;
  import java.io.Writer;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.apache.maven.shared.utils.StringUtils;
  import org.apache.maven.shared.utils.cli.CommandLineException;
  import org.apache.maven.shared.utils.cli.CommandLineUtils;
  import org.apache.maven.shared.utils.cli.Commandline;
  import org.apache.maven.shared.utils.cli.StreamConsumer;
  import org.apache.maven.shared.utils.cli.WriterStreamConsumer;
  import org.apache.maven.shared.utils.io.FileUtils;
  
  /**
   * @author Benjamin Bentmann
   */
  class ForkedLauncher
      implements MavenLauncher
  {
  
      private final String mavenHome;
  
      private final String executable;
  
      private final Map<String, String> envVars;
  
      public ForkedLauncher( String mavenHome )
      {
          this( mavenHome, Collections.<String, String> emptyMap(), false );
      }
  
      public ForkedLauncher( String mavenHome, Map<String, String> envVars, boolean debugJvm )
      {
          this.mavenHome = mavenHome;
          this.envVars = envVars;
  
          String script = debugJvm ? "mvnDebug" : "mvn";
  
          if ( mavenHome != null )
          {
              executable = new File( mavenHome, "bin/" + script ).getPath();
          }
          else
          {
              executable = script;
          }
      }
  
      public int run( String[] cliArgs, Map<String, String> envVars, String workingDirectory, File logFile )
          throws IOException, LauncherException
      {
          Commandline cmd = new Commandline();
  
          cmd.setExecutable( executable );
  
          if ( mavenHome != null )
          {
              cmd.addEnvironment( "M2_HOME", mavenHome );
          }
  
          if ( envVars != null )
          {
              for ( Map.Entry<String, String> envVar : envVars.entrySet() )
              {
                  cmd.addEnvironment( envVar.getKey(), envVar.getValue() );
              }
          }
  
          if ( envVars == null || envVars.get( "JAVA_HOME" ) == null )
          {
              cmd.addEnvironment( "JAVA_HOME", System.getProperty( "java.home" ) );
          }
 
         cmd.addEnvironment( "MAVEN_TERMINATE_CMD", "on" );
 
         cmd.setWorkingDirectory( workingDirectory );
 
         for ( String cliArg : cliArgs )
         {
             cmd.createArg().setValue( cliArg );
         }
 
         Writer logWriter = new FileWriter( logFile );
 
         StreamConsumer out = new WriterStreamConsumer( logWriter );
 
         StreamConsumer err = new WriterStreamConsumer( logWriter );
 
         try
         {
             return CommandLineUtils.executeCommandLine( cmd, out, err );
         }
         catch ( CommandLineException e )
         {
             throw new LauncherException( "Failed to run Maven: " + e.getMessage() + "\n" + cmd, e );
         }
         finally
         {
             logWriter.close();
         }
     }
 
     public int run( String[] cliArgs, String workingDirectory, File logFile )
         throws IOException, LauncherException
     {
         return run( cliArgs, envVars, workingDirectory, logFile );
     }
 
     public String getMavenVersion()
         throws IOException, LauncherException
     {
         File logFile;
         try
         {
             logFile = File.createTempFile( "maven", "log" );
         }
         catch ( IOException e )
         {
             throw new LauncherException( "Error creating temp file", e );
         }
 
         // disable EMMA runtime controller port allocation, should be harmless if EMMA is not used
         Map<String, String> envVars = Collections.singletonMap( "MAVEN_OPTS", "-Demma.rt.control=false" );
         run( new String[] { "--version" }, envVars, null, logFile );
 
         List<String> logLines = FileUtils.loadFile( logFile );
         // noinspection ResultOfMethodCallIgnored
         logFile.delete();
 
         String version = extractMavenVersion( logLines );
 
         if ( version == null )
         {
             throw new LauncherException( "Illegal Maven output: String 'Maven' not found in the following output:\n"
                 + StringUtils.join( logLines.iterator(), "\n" ) );
         }
         else
         {
             return version;
         }
     }
 
     static String extractMavenVersion( List<String> logLines )
     {
         String version = null;
 
         final Pattern mavenVersion = Pattern.compile( "(?i).*Maven.*? ([0-9]\\.\\S*).*" );
 
         for ( Iterator<String> it = logLines.iterator(); version == null && it.hasNext(); )
         {
             String line = it.next();
 
             Matcher m = mavenVersion.matcher( line );
             if ( m.matches() )
             {
                 version = m.group( 1 );
             }
         }
 
         return version;
     }
 
 }