package org.apache.maven.surefire.util;
   
   /*
    * 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.util.ArrayList;
  import java.util.Calendar;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.List;
  
  /**
   * Scans directories looking for tests.
   *
   * @author Karl M. Davis
   * @author Kristian Rosenvold
   */
  public class DefaultDirectoryScanner
      implements DirectoryScanner
  {
  
      private static final String FS = System.getProperty( "file.separator" );
  
      private static final String[] EMPTY_STRING_ARRAY = new String[0];
  
      private static final String JAVA_SOURCE_FILE_EXTENSION = ".java";
  
      private static final String JAVA_CLASS_FILE_EXTENSION = ".class";
  
      private final File basedir;
  
      private final List includes;
  
      private final List excludes;
  
      private final List classesSkippedByValidation = new ArrayList();
  
      private final Comparator sortOrder;
  
      private final String runOrder;
  
  
      public DefaultDirectoryScanner( File basedir, List includes, List excludes, String runOrder )
      {
          this.basedir = basedir;
          this.includes = includes;
          this.excludes = excludes;
          this.runOrder = runOrder;
          this.sortOrder = getSortOrderComparator( runOrder );
      }
  
      public TestsToRun locateTestClasses( ClassLoader classLoader, ScannerFilter scannerFilter )
      {
          String[] testClassNames = collectTests();
          List result = new ArrayList();
  
          for ( int i = 0; i < testClassNames.length; i++ )
          {
              String className = testClassNames[i];
  
              Class testClass = loadClass( classLoader, className );
  
              if ( scannerFilter == null || scannerFilter.accept( testClass ) )
              {
                  result.add( testClass );
              }
              else
              {
                  classesSkippedByValidation.add( testClass );
              }
          }
          if ( "random".equals( runOrder ) )
          {
              Collections.shuffle( result );
          }
          else if ( sortOrder != null )
          {
              Collections.sort( result, sortOrder );
          }
          return new TestsToRun( result );
      }
  
     private static Class loadClass( ClassLoader classLoader, String className )
     {
         Class testClass;
         try
         {
             testClass = classLoader.loadClass( className );
         }
         catch ( ClassNotFoundException e )
         {
             throw new NestedRuntimeException( "Unable to create test class '" + className + "'", e );
         }
         return testClass;
     }
 
 
     String[] collectTests()
     {
         String[] tests = EMPTY_STRING_ARRAY;
         if ( basedir.exists() )
         {
             org.codehaus.plexus.util.DirectoryScanner scanner = new org.codehaus.plexus.util.DirectoryScanner();
 
             scanner.setBasedir( basedir );
 
             if ( includes != null )
             {
                 scanner.setIncludes( processIncludesExcludes( includes ) );
             }
 
             if ( excludes != null )
             {
                 scanner.setExcludes( processIncludesExcludes( excludes ) );
             }
 
             scanner.scan();
 
             tests = scanner.getIncludedFiles();
             for ( int i = 0; i < tests.length; i++ )
             {
                 String test = tests[i];
                 test = test.substring( 0, test.indexOf( "." ) );
                 tests[i] = test.replace( FS.charAt( 0 ), '.' );
             }
         }
         return tests;
     }
 
     private static String[] processIncludesExcludes( List list )
     {
         String[] incs = new String[list.size()];
 
         for ( int i = 0; i < incs.length; i++ )
         {
             String inc = (String) list.get( i );
             if ( inc.endsWith( JAVA_SOURCE_FILE_EXTENSION ) )
             {
                 inc = new StringBuffer(
                     inc.length() - JAVA_SOURCE_FILE_EXTENSION.length() + JAVA_CLASS_FILE_EXTENSION.length() ).append(
                     inc.substring( 0, inc.lastIndexOf( JAVA_SOURCE_FILE_EXTENSION ) ) ).append(
                     JAVA_CLASS_FILE_EXTENSION ).toString();
             }
             incs[i] = inc;
 
         }
         return incs;
     }
 
     public List getIncludes()
     {
         return includes;
     }
 
     public List getExcludes()
     {
         return excludes;
     }
 
     public List getClassesSkippedByValidation()
     {
         return classesSkippedByValidation;
     }
 
     private Comparator getSortOrderComparator( String runOrder )
     {
         if ( "alphabetical".equals( runOrder ) )
         {
             return getAlphabeticalComparator();
         }
 
         else if ( "reversealphabetical".equals( runOrder ) )
         {
             return getReverseAlphabeticalComparator();
         }
         else if ( "hourly".equals( runOrder ) )
         {
             final int hour = Calendar.getInstance().get( Calendar.HOUR_OF_DAY );
             return ( ( hour % 2 ) == 0 )
                 ? getAlphabeticalComparator()
                 : getReverseAlphabeticalComparator();
         }
         return null;
     }
 
     private Comparator getReverseAlphabeticalComparator()
     {
         return new Comparator()
         {
             public int compare( Object o1, Object o2 )
             {
                 return ( (Class) o2 ).getName().compareTo( ( (Class) o1 ).getName() );
             }
         };
     }
 
     private Comparator getAlphabeticalComparator()
     {
         return new Comparator()
         {
             public int compare( Object o1, Object o2 )
             {
                 return ( (Class) o1 ).getName().compareTo( ( (Class) o2 ).getName() );
             }
         };
     }
 
 }