package org.apache.maven.it;

 /*

  * 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.FileOutputStream;

 import java.io.IOException;

 import java.io.PrintStream;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 import java.util.Properties;

 /**

  * Launches an embedded Maven 3.x instance from the current class path, i.e. the Maven 3.x dependencies are assumed to

  * be present on the class path.

  * 

  * @author Benjamin Bentmann

  */

 class Classpath3xLauncher

     implements MavenLauncher

 {

     private final Object mavenCli;

     private final Method doMain;

     public Classpath3xLauncher()

         throws LauncherException

     {

         ClassLoader coreLoader = Thread.currentThread().getContextClassLoader();

         try

         {

             Class cliClass = coreLoader.loadClass( "org.apache.maven.cli.MavenCli" );

             mavenCli = cliClass.newInstance();

             Class[] parameterTypes = { String[].class, String.class, PrintStream.class, PrintStream.class };

             doMain = cliClass.getMethod( "doMain", parameterTypes );

         }

         catch ( ClassNotFoundException e )

         {

             throw new LauncherException( e.getMessage(), e );

         }

         catch ( NoSuchMethodException e )

         {

             throw new LauncherException( e.getMessage(), e );

         }

         catch ( InstantiationException e )

         {

             throw new LauncherException( e.getMessage(), e );

         }

         catch ( IllegalAccessException e )

         {

             throw new LauncherException( e.getMessage(), e );

         }

     }

     public int run( String[] cliArgs, String workingDirectory, File logFile )

         throws IOException, LauncherException

     {

         PrintStream out = ( logFile != null ) ? new PrintStream( new FileOutputStream( logFile ) ) : System.out;

         try

         {

             Properties originalProperties = System.getProperties();

             System.setProperties( null );

             System.setProperty( "maven.home", originalProperties.getProperty( "maven.home", "" ) );

             System.setProperty( "user.dir", new File( workingDirectory ).getAbsolutePath() );

             ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();

             Thread.currentThread().setContextClassLoader( mavenCli.getClass().getClassLoader() );

             try

             {

                 Object result = doMain.invoke( mavenCli, new Object[] { cliArgs, workingDirectory, out, out } );

                 return ( (Number) result ).intValue();

             }

             finally

             {

                 Thread.currentThread().setContextClassLoader( originalClassLoader );

                 System.setProperties( originalProperties );

             }

         }

         catch ( IllegalAccessException e )

         {

             throw new LauncherException( "Failed to run Maven: " + e.getMessage(), e );

         }

         catch ( InvocationTargetException e )

         {

             throw new LauncherException( "Failed to run Maven: " + e.getMessage(), e );

         }

         finally

         {

             if ( logFile != null )

             {

                 out.close();

             }

         }

     }

 }