package org.apache.maven.shared.scriptinterpreter;
   
   /*
    * 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 bsh.Capabilities;
  import bsh.EvalError;
  import bsh.Interpreter;
  import bsh.TargetError;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.PrintStream;
  import java.util.List;
  import java.util.Map;
  
  import org.codehaus.plexus.component.annotations.Component;
  
  /**
   * Provides a facade to evaluate BeanShell scripts.
   *
   * @author Benjamin Bentmann
   * @version $Id: BeanShellScriptInterpreter.java 1361828 2012-07-15 22:30:27Z hboutemy $
   */
  @Component( role = ScriptInterpreter.class, hint = "bsh" )
  public class BeanShellScriptInterpreter
      implements ScriptInterpreter
  {
  
      /**
       * {@inheritDoc}
       */
      public Object evaluateScript( String script, List<String> classPath, Map<String, ? extends Object> globalVariables,
                                    PrintStream scriptOutput )
          throws ScriptEvaluationException
      {
          PrintStream origOut = System.out;
          PrintStream origErr = System.err;
  
          try
          {
              Interpreter engine = new Interpreter();
  
              if ( scriptOutput != null )
              {
                  System.setErr( scriptOutput );
                  System.setOut( scriptOutput );
                  engine.setErr( scriptOutput );
                  engine.setOut( scriptOutput );
              }
  
              if ( !Capabilities.haveAccessibility() )
              {
                  try
                  {
                      Capabilities.setAccessibility( true );
                  }
                  catch ( Exception e )
                  {
                      if ( scriptOutput != null )
                      {
                          e.printStackTrace( scriptOutput );
                      }
                  }
              }
  
              if ( classPath != null && !classPath.isEmpty() )
              {
                  for ( String path : classPath )
                  {
                      try
                      {
                          engine.getClassManager().addClassPath( new File( path ).toURI().toURL() );
                      }
                      catch ( IOException e )
                      {
                          throw new RuntimeException( "bad class path: " + path, e );
                      }
                  }
              }
  
              if ( globalVariables != null )
              {
                 for ( String variable : globalVariables.keySet() )
                 {
                     Object value = globalVariables.get( variable );
                     try
                     {
                         engine.set( variable, value );
                     }
                     catch ( EvalError e )
                     {
                         throw new RuntimeException( e );
                     }
                 }
             }
 
             try
             {
                 return engine.eval( script );
             }
             catch ( TargetError e )
             {
                 throw new ScriptEvaluationException( e.getTarget() );
             }
             catch ( ThreadDeath e )
             {
                 throw e;
             }
             catch ( Throwable e )
             {
                 throw new ScriptEvaluationException( e );
             }
         }
         finally
         {
             System.setErr( origErr );
             System.setOut( origOut );
         }
     }
 
 }