package org.apache.maven.plugin.invoker;

 /*

  * 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.IOException;

 import java.io.PrintStream;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Map;

 import bsh.EvalError;

 import bsh.Interpreter;

 import bsh.TargetError;

 /**

  * Provides a facade to evaluate BeanShell scripts.

  * 

  * @author Benjamin Bentmann

  * @version $Id: BeanShellScriptInterpreter.java 684549 2008-08-10 16:30:43Z bentmann $

  */

 class BeanShellScriptInterpreter

     implements ScriptInterpreter

 {

     /**

      * {@inheritDoc}

      */

     public Object evaluateScript( String script, List classPath, Map 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 ( classPath != null && !classPath.isEmpty() )

             {

                 for ( Iterator it = classPath.iterator(); it.hasNext(); )

                 {

                     String path = (String) it.next();

                     try

                     {

                         engine.getClassManager().addClassPath( new File( path ).toURI().toURL() );

                     }

                     catch ( IOException e )

                     {

                         throw new RuntimeException( "bad class path: " + path, e );

                     }

                 }

             }

             if ( globalVariables != null )

             {

                 for ( Iterator it = globalVariables.keySet().iterator(); it.hasNext(); )

                 {

                     String variable = (String) it.next();

                     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 ( Exception e )

             {

                 throw new ScriptEvaluationException( e );

             }

         }

         finally

         {

             System.setErr( origErr );

             System.setOut( origOut );

         }

     }

 }