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 groovy.lang.Binding;
  import groovy.lang.GroovyShell;
  import org.codehaus.groovy.control.CompilerConfiguration;
  import org.codehaus.groovy.runtime.powerassert.PowerAssertionError;
  import org.codehaus.groovy.tools.RootLoader;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.PrintStream;
  import java.net.URL;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Provides a facade to evaluate Groovy scripts.
   * 
   * @author Benjamin Bentmann
   */
  class GroovyScriptInterpreter
      implements ScriptInterpreter
  {
  
      /** {@inheritDoc} */
      @Override
      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 ( RootLoader childFirstLoader = new RootLoader( new URL[] {}, getClass().getClassLoader() ) )
          {
  
              if ( scriptOutput != null )
              {
                  System.setErr( scriptOutput );
                  System.setOut( scriptOutput );
              }
  
              if ( classPath != null && !classPath.isEmpty() )
              {
                  for ( String path : classPath )
                  {
                      childFirstLoader.addURL( new File( path ).toURI().toURL() );
                  }
              }
  
              GroovyShell interpreter = new GroovyShell( childFirstLoader,
                      new Binding( globalVariables ),
                      new CompilerConfiguration( CompilerConfiguration.DEFAULT ) );
  
              try
              {
                  return interpreter.evaluate( script );
              }
              catch ( ThreadDeath e )
              {
                  throw e;
              }
              catch ( PowerAssertionError e )
              {
                  throw new ScriptEvaluationException( "Assertion Error", e );
              }
              catch ( Throwable e )
              {
                  throw new ScriptEvaluationException( e );
              }
          }
          catch ( IOException e )
          {
              throw new ScriptEvaluationException( e );
          }
          finally
          {
              System.setErr( origErr );
              System.setOut( origOut );
          }
     }
 
 }