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.ArrayList;

 import java.util.HashMap;

 import java.util.Iterator;

 import java.util.LinkedHashMap;

 import java.util.List;

 import java.util.Locale;

 import java.util.Map;

 import org.apache.maven.plugin.MojoExecutionException;

 import org.apache.maven.plugin.logging.Log;

 import org.codehaus.plexus.util.FileUtils;

 import org.codehaus.plexus.util.StringUtils;

 /**

  * Runs pre-/post-build hook scripts.

  * 

  * @author Benjamin Bentmann

  * @version $Id: ScriptRunner.java 751403 2009-03-08 11:52:40Z bentmann $

  */

 class ScriptRunner

 {

     /**

      * The mojo logger to print diagnostic to, never <code>null</code>.

      */

     private Log log;

     /**

      * The supported script interpreters, indexed by the lower-case file extension of their associated script files,

      * never <code>null</code>.

      */

     private Map scriptInterpreters;

     /**

      * The common set of global variables to pass into the script interpreter, never <code>null</code>.

      */

     private Map globalVariables;

     /**

      * The additional class path for the script interpreter, never <code>null</code>.

      */

     private List classPath;

     /**

      * The file encoding of the hook scripts or <code>null</code> to use platform encoding.

      */

     private String encoding;

     /**

      * Creates a new script runner.

      * 

      * @param log The mojo logger to print diagnostic to, must not be <code>null</code>.

      */

     public ScriptRunner( Log log )

     {

         if ( log == null )

         {

             throw new IllegalArgumentException( "missing logger" );

         }

         this.log = log;

         scriptInterpreters = new LinkedHashMap();

         scriptInterpreters.put( "bsh", new BeanShellScriptInterpreter() );

         scriptInterpreters.put( "groovy", new GroovyScriptInterpreter() );

         globalVariables = new HashMap();

         classPath = new ArrayList();

     }

     /**

      * Gets the mojo logger.

      * 

      * @return The mojo logger, never <code>null</code>.

      */

     private Log getLog()

     {

         return log;

     }

     /**

      * Sets a global variable for the script interpeter.

      * 

      * @param name The name of the variable, must not be <code>null</code>.

      * @param value The value of the variable, may be <code>null</code>.

      */

     public void setGlobalVariable( String name, Object value )

     {

         this.globalVariables.put( name, value );

     }

     /**

      * Sets the additional class path for the hook scripts. Note that the provided list is copied, so any later changes

      * will not affect the scripts.

      * 

      * @param classPath The additional class path for the script interpreter, may be <code>null</code> or empty if only

      *            the plugin realm should be used for the script evaluation. If specified, this class path will precede

      *            the artifacts from the plugin class path.

      */

     public void setClassPath( List classPath )

     {

         this.classPath = ( classPath != null ) ? new ArrayList( classPath ) : new ArrayList();

     }

     /**

      * Sets the file encoding of the hook scripts.

      * 

      * @param encoding The file encoding of the hook scripts, may be <code>null</code> or empty to use the platform's

      *            default encoding.

      */

     public void setScriptEncoding( String encoding )

     {

         this.encoding = StringUtils.isNotEmpty( encoding ) ? encoding : null;

     }

     /**

      * Runs the specified hook script of the specified project (if any).

      * 

      * @param scriptDescription The description of the script to use for logging, must not be <code>null</code>.

      * @param basedir The base directory of the project, must not be <code>null</code>.

      * @param relativeScriptPath The path to the script relative to the project base directory, may be <code>null</code>

      *            to skip the script execution.

      * @param context The key-value storage used to share information between hook scripts, may be <code>null</code>.

      * @param logger The logger to redirect the script output to, may be <code>null</code> to use stdout/stderr.

      * @param stage The stage of the build job the script is invoked in, must not be <code>null</code>.

      * @throws MojoExecutionException If an I/O error occurred while reading the script file.

      * @throws BuildFailureException If the script did not return <code>true</code> of threw an exception.

      */

     public void run( final String scriptDescription, final File basedir, final String relativeScriptPath,

                      final Map context, final FileLogger logger, String stage )

         throws MojoExecutionException, BuildFailureException

     {

         if ( relativeScriptPath == null )

         {

             return;

         }

         final File scriptFile = resolveScript( new File( basedir, relativeScriptPath ) );

         if ( !scriptFile.exists() )

         {

             return;

         }

         Map globalVariables = new HashMap( this.globalVariables );

         globalVariables.put( "basedir", basedir );

         globalVariables.put( "context", context );

         PrintStream out = ( logger != null ) ? logger.getPrintStream() : null;

         ScriptInterpreter interpreter = getInterpreter( scriptFile );

         if ( getLog().isDebugEnabled() )

         {

             String name = interpreter.getClass().getName();

             name = name.substring( name.lastIndexOf( '.' ) + 1 );

             getLog().debug( "Running script with " + name + ": " + scriptFile );

         }

         String script;

         try

         {

             script = FileUtils.fileRead( scriptFile, encoding );

         }

         catch ( IOException e )

         {

             String errorMessage =

                 "error reading " + scriptDescription + " " + scriptFile.getPath() + ", " + e.getMessage();

             throw new MojoExecutionException( errorMessage, e );

         }

         Object result;

         try

         {

             if ( logger != null )

             {

                 logger.consumeLine( "Running " + scriptDescription + ": " + scriptFile );

             }

             result = interpreter.evaluateScript( script, classPath, globalVariables, out );

             if ( logger != null )

             {

                 logger.consumeLine( "Finished " + scriptDescription + ": " + scriptFile );

             }

         }

         catch ( ScriptEvaluationException e )

         {

             Throwable t = ( e.getCause() != null ) ? e.getCause() : e;

             String msg = ( t.getMessage() != null ) ? t.getMessage() : t.toString();

             if ( getLog().isDebugEnabled() )

             {

                 String errorMessage = "Error evaluating " + scriptDescription + " " + scriptFile.getPath() + ", " + t;

                 getLog().debug( errorMessage, t );

             }

             if ( logger != null )

             {

                 t.printStackTrace( logger.getPrintStream() );

             }

             throw new BuildFailureException( "The " + scriptDescription + " did not succeed. " + msg, stage );

         }

         if ( !( result == null || Boolean.TRUE.equals( result ) || "true".equals( result ) ) )

         {

             throw new BuildFailureException( "The " + scriptDescription + " returned " + result + ".", stage );

         }

     }

     /**

      * Gets the effective path to the specified script. For convenience, we allow to specify a script path as "verify"

      * and have the plugin auto-append the file extension to search for "verify.bsh" and "verify.groovy".

      * 

      * @param scriptFile The script file to resolve, may be <code>null</code>.

      * @return The effective path to the script file or <code>null</code> if the input was <code>null</code>.

      */

     private File resolveScript( File scriptFile )

     {

         if ( scriptFile != null && !scriptFile.exists() )

         {

             for ( Iterator it = this.scriptInterpreters.keySet().iterator(); it.hasNext(); )

             {

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

                 File candidateFile = new File( scriptFile.getPath() + '.' + ext );

                 if ( candidateFile.exists() )

                 {

                     scriptFile = candidateFile;

                     break;

                 }

             }

         }

         return scriptFile;

     }

     /**

      * Determines the script interpreter for the specified script file by looking at its file extension. In this

      * context, file extensions are considered case-insensitive. For backward compatibility with plugin versions 1.2-,

      * the BeanShell interpreter will be used for any unrecognized extension.

      * 

      * @param scriptFile The script file for which to determine an interpreter, must not be <code>null</code>.

      * @return The script interpreter for the file, never <code>null</code>.

      */

     private ScriptInterpreter getInterpreter( File scriptFile )

     {

         String ext = FileUtils.extension( scriptFile.getName() ).toLowerCase( Locale.ENGLISH );

         ScriptInterpreter interpreter = (ScriptInterpreter) scriptInterpreters.get( ext );

         if ( interpreter == null )

         {

             interpreter = (ScriptInterpreter) scriptInterpreters.get( "bsh" );

         }

         return interpreter;

     }

 }