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.ActivationProperty;
  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.building.ModelProblem.Version;
  import org.apache.maven.model.building.ModelProblemCollectorRequest;
  import org.apache.maven.model.profile.ProfileActivationContext;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * Determines profile activation based on the existence or value of some execution property.
   * 
   * @author Benjamin Bentmann
   */
  @Component( role = ProfileActivator.class, hint = "property" )
  public class PropertyProfileActivator
      implements ProfileActivator
  {
  
      public boolean isActive( Profile profile, ProfileActivationContext context, ModelProblemCollector problems )
      {
          boolean active = false;
  
          Activation activation = profile.getActivation();
  
          if ( activation != null )
          {
              ActivationProperty property = activation.getProperty();
  
              if ( property != null )
              {
                  String name = property.getName();
                  boolean reverseName = false;
  
                  if ( name != null && name.startsWith( "!" ) )
                  {
                      reverseName = true;
                      name = name.substring( 1 );
                  }
  
                  if ( name == null || name.length() <= 0 )
                  {
                      problems.add( new ModelProblemCollectorRequest( Severity.ERROR, Version.BASE)
                              .setMessage( "The property name is required to activate the profile " + profile.getId())
                              .setLocation( property.getLocation( "" )));
                      return false;
                  }
  
                  String sysValue = context.getUserProperties().get( name );
                  if ( sysValue == null )
                  {
                      sysValue = context.getSystemProperties().get( name );
                  }
  
                  String propValue = property.getValue();
                  if ( StringUtils.isNotEmpty( propValue ) )
                  {
                      boolean reverseValue = false;
                      if ( propValue.startsWith( "!" ) )
                      {
                          reverseValue = true;
                          propValue = propValue.substring( 1 );
                      }
  
                      // we have a value, so it has to match the system value...
                      boolean result = propValue.equals( sysValue );
  
                      if ( reverseValue )
                      {
                          active = !result;
                      }
                      else
                      {
                          active = result;
                      }
                  }
                 else
                 {
                     boolean result = StringUtils.isNotEmpty( sysValue );
 
                     if ( reverseName )
                     {
                         active = !result;
                     }
                     else
                     {
                         active = result;
                     }
                 }
             }
         }
 
         return active;
     }
 
 }