package org.codehaus.mojo.natives.util;
   
   import java.util.Iterator;
   import java.util.Map;
   
   import org.codehaus.mojo.natives.EnvFactory;
   import org.codehaus.mojo.natives.NativeBuildException;
   import org.codehaus.plexus.util.cli.Commandline;
   
  public class EnvUtil
  {
      public static String getEnv( String envKey )
      {
          return getEnv( envKey, "" );
      }
  
      public static String getEnv( String envKey, String defaultValue )
      {
          return getEnv( envKey, null, defaultValue );
      }
  
      public static String getEnv( String envKey, String alternateSystemProperty, String defaultValue )
      {
          String envValue = null;
  
          try
          {
              // TODO move this to an env object similar to Ant Environment
              envValue = System.getenv( envKey );
  
              if ( envValue == null && alternateSystemProperty != null )
              {
                  envValue = System.getProperty( alternateSystemProperty );
              }
          }
          catch ( Error e )
          {
              // JDK 1.4?
              if ( alternateSystemProperty != null )
              {
                  envValue = getProperty( alternateSystemProperty );
              }
          }
  
          if ( envValue == null )
          {
              envValue = defaultValue;
          }
  
          return envValue;
      }
  
      private static String getProperty( String key )
      {
          if ( key != null )
          {
              return System.getProperty( key );
          }
  
          return null;
      }
  
      public static void setupCommandlineEnv( Commandline cl, EnvFactory envFactory )
          throws NativeBuildException
      {
          if ( envFactory != null )
          {
              Map envs = envFactory.getEnvironmentVariables();
  
              Iterator iter = envs.keySet().iterator();
  
              while ( iter.hasNext() )
              {
                  String key = (String) iter.next();
                  cl.addEnvironment( key, (String) envs.get( key ) );
              }
          }
      }
  
  }