cvs commit: jakarta-ant/proposal/myrmidon/src/java/org/apache/myrmidon/framework/exec/launchers ExecUtil.java

[do...@apache.org]

donaldp     01/12/21 05:16:39

  Added:       proposal/myrmidon/src/java/org/apache/myrmidon/framework/exec/launchers
                        ExecUtil.java
  Log:
  Added a utility class to hold util functions for implementing Launchers.
  
  Revision  Changes    Path
  1.1                  jakarta-ant/proposal/myrmidon/src/java/org/apache/myrmidon/framework/exec/launchers/ExecUtil.java
  
  Index: ExecUtil.java
  ===================================================================
  /*
   * Copyright (C) The Apache Software Foundation. All rights reserved.
   *
   * This software is published under the terms of the Apache Software License
   * version 1.1, a copy of which has been included  with this distribution in
   * the LICENSE.txt file.
   */
  package org.apache.myrmidon.framework.exec.launchers;
  
  import java.io.File;
  import java.io.IOException;
  import org.apache.myrmidon.framework.exec.ExecMetaData;
  
  /**
   * A set of utility functions useful when writing CommandLaunchers.
   *
   * @author <a href="mailto:peter@apache.org">Peter Donald</a>
   * @version $Revision: 1.1 $ $Date: 2001/12/21 13:16:39 $
   */
  class ExecUtil
  {
      /**
       * The file representing the current working directory.
       */
      private static final File c_cwd;
  
      static
      {
          try
          {
              c_cwd = ( new File( "." ) ).getCanonicalFile();
          }
          catch( final IOException ioe )
          {
              //Should never happen
              throw new IllegalStateException();
          }
      }
  
      /**
       * Private constructor to block instantiation.
       */
      private ExecUtil()
      {
      }
  
      /**
       * Create a new ExecMetaData representing the same command with the specified
       * prefix. This is useful when you are launching the native executable via a
       * script of some sort.
       */
      protected static ExecMetaData prepend( final ExecMetaData metaData,
                                             final String[] prefix )
      {
          final String[] original = metaData.getCommand();
          final String[] command = new String[ original.length + prefix.length ];
  
          System.arraycopy( prefix, 0, command, 0, prefix.length );
          System.arraycopy( original, 0, command, prefix.length, original.length );
  
          return new ExecMetaData( command,
                                   metaData.getEnvironment(),
                                   metaData.getWorkingDirectory(),
                                   metaData.isEnvironmentAdditive() );
      }
  
      /**
       * Utility method to check if specified file is equal
       * to the current working directory.
       */
      protected static boolean isCwd( final File file )
          throws IOException
      {
          return file.getCanonicalFile().equals( getCwd() );
      }
  
      /**
       * Return the current working directory of the JVM.
       * This value is initialized when this class is first loaded.
       */
      protected static File getCwd()
      {
          return c_cwd;
      }
  
      /**
       * Retrieve the directory in which Myrmidon is installed.
       * This is used to determine the locaiton of scripts in various launchers.
       */
      protected static File getAntHomeDirectory()
      {
          final String antHome = System.getProperty( "ant.home" );
          if( null == antHome )
          {
              final String message =
                  "Cannot locate antRun script: Property 'ant.home' not specified";
              throw new IllegalStateException( message );
          }
  
          return new File( antHome );
      }
  }
  
  
  

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