package org.apache.maven.model.profile.activation;
   
   /*
    * 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.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  import org.apache.maven.model.Activation;
  import org.apache.maven.model.Profile;
  import org.apache.maven.model.building.ModelProblemCollector;
  import org.apache.maven.model.building.ModelProblem.Severity;
  import org.apache.maven.model.profile.ProfileActivationContext;
  import org.codehaus.plexus.component.annotations.Component;
  
  /**
   * Determines profile activation based on the version of the current Java runtime.
   * 
   * @author Benjamin Bentmann
   */
  @Component( role = ProfileActivator.class, hint = "jdk-version" )
  public class JdkVersionProfileActivator
      implements ProfileActivator
  {
  
      public boolean isActive( Profile profile, ProfileActivationContext context, ModelProblemCollector problems )
      {
          boolean active = false;
  
          Activation activation = profile.getActivation();
  
          if ( activation != null )
          {
              String jdk = activation.getJdk();
  
              if ( jdk != null )
              {
                  String version = context.getSystemProperties().get( "java.version" );
  
                  if ( version == null || version.length() <= 0 )
                  {
                      problems.add( Severity.ERROR, "Failed to determine Java version for profile " + profile.getId(),
                                    activation.getLocation( "jdk" ), null );
                      return false;
                  }
  
                  if ( jdk.startsWith( "!" ) )
                  {
                      active = !version.startsWith( jdk.substring( 1 ) );
                  }
                  else if ( isRange( jdk ) )
                  {
                      active = isInRange( version, getRange( jdk ) );
                  }
                  else
                  {
                      active = version.startsWith( jdk );
                  }
              }
          }
  
          return active;
      }
  
      private static boolean isInRange( String value, List<RangeValue> range )
      {
          int leftRelation = getRelationOrder( value, range.get( 0 ), true );
  
          if ( leftRelation == 0 )
          {
              return true;
          }
  
          if ( leftRelation < 0 )
          {
              return false;
          }
  
          return getRelationOrder( value, range.get( 1 ), false ) <= 0;
      }
  
      private static int getRelationOrder( String value, RangeValue rangeValue, boolean isLeft )
     {
         if ( rangeValue.value.length() <= 0 )
         {
             return isLeft ? 1 : -1;
         }
 
         value = value.replaceAll( "[^0-9\\.\\-\\_]", "" );
 
         List<String> valueTokens = new ArrayList<String>( Arrays.asList( value.split( "[\\.\\-\\_]" ) ) );
         List<String> rangeValueTokens = new ArrayList<String>( Arrays.asList( rangeValue.value.split( "\\." ) ) );
 
         addZeroTokens( valueTokens, 3 );
         addZeroTokens( rangeValueTokens, 3 );
 
         for ( int i = 0; i < 3; i++ )
         {
             int x = Integer.parseInt( valueTokens.get( i ) );
             int y = Integer.parseInt( rangeValueTokens.get( i ) );
             if ( x < y )
             {
                 return -1;
             }
             else if ( x > y )
             {
                 return 1;
             }
         }
         if ( !rangeValue.closed )
         {
             return isLeft ? -1 : 1;
         }
         return 0;
     }
 
     private static void addZeroTokens( List<String> tokens, int max )
     {
         while ( tokens.size() < max )
         {
             tokens.add( "0" );
         }
     }
 
     private static boolean isRange( String value )
     {
         return value.startsWith( "[" ) || value.startsWith( "(" );
     }
 
     private static List<RangeValue> getRange( String range )
     {
         List<RangeValue> ranges = new ArrayList<RangeValue>();
 
         for ( String token : range.split( "," ) )
         {
             if ( token.startsWith( "[" ) )
             {
                 ranges.add( new RangeValue( token.replace( "[", "" ), true ) );
             }
             else if ( token.startsWith( "(" ) )
             {
                 ranges.add( new RangeValue( token.replace( "(", "" ), false ) );
             }
             else if ( token.endsWith( "]" ) )
             {
                 ranges.add( new RangeValue( token.replace( "]", "" ), true ) );
             }
             else if ( token.endsWith( ")" ) )
             {
                 ranges.add( new RangeValue( token.replace( ")", "" ), false ) );
             }
             else if ( token.length() <= 0 )
             {
                 ranges.add( new RangeValue( "", false ) );
             }
         }
         if ( ranges.size() < 2 )
         {
             ranges.add( new RangeValue( "99999999", false ) );
         }
         return ranges;
     }
 
     private static class RangeValue
     {
         private String value;
 
         private boolean closed;
 
         RangeValue( String value, boolean closed )
         {
             this.value = value.trim();
             this.closed = closed;
         }
 
         public String toString()
         {
             return value;
         }
     }
 
 }