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 groovy.lang.Binding;

 import groovy.lang.GroovyShell;

 import java.io.File;

 import java.io.PrintStream;

 import java.io.PrintWriter;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Map;

 import org.apache.tools.ant.AntClassLoader;

 import org.codehaus.groovy.control.CompilerConfiguration;

 /**

  * Provides a facade to evaluate Groovy scripts.

  * 

  * @author Benjamin Bentmann

  * @version $Id: GroovyScriptInterpreter.java 737521 2009-01-25 15:22:26Z bentmann $

  */

 class GroovyScriptInterpreter

     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

         {

             CompilerConfiguration config = new CompilerConfiguration( CompilerConfiguration.DEFAULT );

             if ( scriptOutput != null )

             {

                 System.setErr( scriptOutput );

                 System.setOut( scriptOutput );

                 config.setOutput( new PrintWriter( scriptOutput ) );

             }

             ClassLoader loader = null;

             if ( classPath != null && !classPath.isEmpty() )

             {

                 AntClassLoader childFirstLoader = new AntClassLoader( getClass().getClassLoader(), false );

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

                 {

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

                     childFirstLoader.addPathComponent( new File( path ) );

                 }

                 loader = childFirstLoader;

             }

             Binding binding = new Binding( globalVariables );

             GroovyShell interpreter = new GroovyShell( loader, binding, config );

             try

             {

                 return interpreter.evaluate( script );

             }

             catch ( ThreadDeath e )

             {

                 throw e;

             }

             catch ( Throwable e )

             {

                 throw new ScriptEvaluationException( e );

             }

         }

         finally

         {

             System.setErr( origErr );

             System.setOut( origOut );

         }

     }

 }