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.io.File;
  
  import org.apache.maven.model.Activation;
  import org.apache.maven.model.ActivationFile;
  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.path.PathTranslator;
  import org.apache.maven.model.profile.ProfileActivationContext;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  import org.codehaus.plexus.interpolation.AbstractValueSource;
  import org.codehaus.plexus.interpolation.MapBasedValueSource;
  import org.codehaus.plexus.interpolation.RegexBasedInterpolator;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * Determines profile activation based on the existence/absence of some file.
   * 
   * @author Benjamin Bentmann
   */
  @Component( role = ProfileActivator.class, hint = "file" )
  public class FileProfileActivator
      implements ProfileActivator
  {
  
      @Requirement
      private PathTranslator pathTranslator;
  
      public FileProfileActivator setPathTranslator( PathTranslator pathTranslator )
      {
          this.pathTranslator = pathTranslator;
          return this;
      }
  
      public boolean isActive( Profile profile, ProfileActivationContext context, ModelProblemCollector problems )
      {
          Activation activation = profile.getActivation();
  
          if ( activation == null )
          {
              return false;
          }
  
          ActivationFile file = activation.getFile();
  
          if ( file == null )
          {
              return false;
          }
  
          String path;
          boolean missing;
  
          if ( StringUtils.isNotEmpty( file.getExists() ) )
          {
              path = file.getExists();
              missing = false;
          }
          else if ( StringUtils.isNotEmpty( file.getMissing() ) )
          {
              path = file.getMissing();
              missing = true;
          }
          else
          {
              return false;
          }
  
          RegexBasedInterpolator interpolator = new RegexBasedInterpolator();
  
          final File basedir = context.getProjectDirectory();
  
          if ( basedir != null )
          {
              interpolator.addValueSource( new AbstractValueSource( false )
              {
                  public Object getValue( String expression )
                 {
                     /*
                      * NOTE: We intentionally only support ${basedir} and not ${project.basedir} as the latter form
                      * would suggest that other project.* expressions can be used which is however beyond the design.
                      */
                     if ( "basedir".equals( expression ) )
                     {
                         return basedir.getAbsolutePath();
                     }
                     return null;
                 }
             } );
         }
         else if ( path.indexOf( "${basedir}" ) >= 0 )
         {
             return false;
         }
 
         interpolator.addValueSource( new MapBasedValueSource( context.getUserProperties() ) );
 
         interpolator.addValueSource( new MapBasedValueSource( context.getSystemProperties() ) );
 
         try
         {
             path = interpolator.interpolate( path, "" );
         }
         catch ( Exception e )
         {
             problems.add( Severity.ERROR, "Failed to interpolate file location " + path + " for profile "
                 + profile.getId() + ": " + e.getMessage(), file.getLocation( missing ? "missing" : "exists" ), e );
             return false;
         }
 
         path = pathTranslator.alignToBaseDirectory( path, basedir );
 
         File f = new File( path );
 
         if ( !f.isAbsolute() )
         {
             return false;
         }
 
         boolean fileExists = f.exists();
 
         return missing ? !fileExists : fileExists;
     }
 
 }