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 org.apache.maven.model.Activation;
  import org.apache.maven.model.ActivationOS;
  import org.apache.maven.model.Profile;
  import org.apache.maven.model.building.ModelProblemCollector;
  import org.apache.maven.model.profile.ProfileActivationContext;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.util.Os;
  
  /**
   * Determines profile activation based on the operating system of the current runtime platform.
   * 
   * @author Benjamin Bentmann
   * @see ActivationOS
   */
  @Component( role = ProfileActivator.class, hint = "os" )
  public class OperatingSystemProfileActivator
      implements ProfileActivator
  {
  
      public boolean isActive( Profile profile, ProfileActivationContext context, ModelProblemCollector problems )
      {
          Activation activation = profile.getActivation();
  
          if ( activation == null )
          {
              return false;
          }
  
          ActivationOS os = activation.getOs();
  
          if ( os == null )
          {
              return false;
          }
  
          boolean active = ensureAtLeastOneNonNull( os );
  
          if ( active && os.getFamily() != null )
          {
              active = determineFamilyMatch( os.getFamily() );
          }
          if ( active && os.getName() != null )
          {
              active = determineNameMatch( os.getName() );
          }
          if ( active && os.getArch() != null )
          {
              active = determineArchMatch( os.getArch() );
          }
          if ( active && os.getVersion() != null )
          {
              active = determineVersionMatch( os.getVersion() );
          }
  
          return active;
      }
  
      private boolean ensureAtLeastOneNonNull( ActivationOS os )
      {
          return os.getArch() != null || os.getFamily() != null || os.getName() != null || os.getVersion() != null;
      }
  
      private boolean determineVersionMatch( String version )
      {
          String test = version;
          boolean reverse = false;
  
          if ( test.startsWith( "!" ) )
          {
              reverse = true;
              test = test.substring( 1 );
          }
  
          boolean result = Os.isVersion( test );
  
          return reverse ? !result : result;
      }
  
     private boolean determineArchMatch( String arch )
     {
         String test = arch;
         boolean reverse = false;
 
         if ( test.startsWith( "!" ) )
         {
             reverse = true;
             test = test.substring( 1 );
         }
 
         boolean result = Os.isArch( test );
 
         return reverse ? !result : result;
     }
 
     private boolean determineNameMatch( String name )
     {
         String test = name;
         boolean reverse = false;
 
         if ( test.startsWith( "!" ) )
         {
             reverse = true;
             test = test.substring( 1 );
         }
 
         boolean result = Os.isName( test );
 
         return reverse ? !result : result;
     }
 
     private boolean determineFamilyMatch( String family )
     {
         String test = family;
         boolean reverse = false;
 
         if ( test.startsWith( "!" ) )
         {
             reverse = true;
             test = test.substring( 1 );
         }
 
         boolean result = Os.isFamily( test );
 
         return reverse ? !result : result;
     }
 
 }