package org.apache.maven.script.ant;
   
   /*
    * 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.Collections;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.plugin.logging.Log;
  import org.apache.maven.project.MavenProject;
  import org.apache.tools.ant.PropertyHelper;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
  import org.codehaus.plexus.util.introspection.ReflectionValueExtractor;
  
  /**
   * Makes the ${expressions} used in Maven available to Ant as properties.
   *
   * @author <a href="mailto:kenney@apache.org">Kenney Westerhof</a>
   */
  public class AntPropertyHelper
      extends PropertyHelper
  {
      private static final String DEPENDENCY_PREFIX = "maven.dependency.";
      private Log log;
      private ExpressionEvaluator exprEvaluator;
      private MavenProject mavenProject;
      private Map<String, String> artifactMap = new HashMap<String, String>();
  
      /**
       * @deprecated use the other constructor
       * @param project
       * @param l
       */
      public AntPropertyHelper( MavenProject project, Log l )
      {
          mavenProject = project;
          log = l;
      }
  
      /**
       * @deprecated use {@link #AntPropertyHelper(ExpressionEvaluator, Set, Log)} to resolve maven.dependency.* properties
       * @param exprEvaluator
       * @param l
       */
      public AntPropertyHelper( ExpressionEvaluator exprEvaluator, Log l )
      {
          this( exprEvaluator, Collections.<Artifact>emptySet(), l );
      }
  
      /**
       * @param exprEvaluator
       * @param artifacts
       * @param l
       */
      public AntPropertyHelper( ExpressionEvaluator exprEvaluator, Set<Artifact> artifacts, Log l )
      {
          this.mavenProject = null;
          this.exprEvaluator = exprEvaluator;
          this.log = l;
  
          for ( Artifact artifact : artifacts )
          {
              String key = DEPENDENCY_PREFIX + artifact.getGroupId() + "." + artifact.getArtifactId()
                  + ( artifact.getClassifier() != null ? "." + artifact.getClassifier() : "" )
                  + ( artifact.getType() != null ? "." + artifact.getType() : "" ) + ".path";
  
              log.debug( "Storing: " + key + "=" + artifact.getFile().getPath() );
  
              artifactMap.put( key, artifact.getFile().getPath() );
          }
      }
  
      /**
       * @see org.apache.tools.ant.PropertyHelper#getPropertyHook(java.lang.String, java.lang.String, boolean)
       */
      public synchronized Object getPropertyHook( String ns, String name, boolean user )
      {
          if ( log.isDebugEnabled() )
         {
             log.debug( "getProperty(ns=" + ns + ", name=" + name + ", user=" + user + ")" );
         }
 
         /* keep old behaviour */
         if ( mavenProject != null )
         {
             return getPropertyHook( ns, name, user, mavenProject );
         }
 
 
         Object val = null;
 
         if ( name.startsWith( DEPENDENCY_PREFIX ) )
         {
             val = (String) artifactMap.get( name );
         }
 
         if ( val == null )
         {
             try
             {
                 val = exprEvaluator.evaluate( "${" + name + "}" );
             }
             catch ( ExpressionEvaluationException e )
             {
                 if ( log.isErrorEnabled() )
                 {
                     log.error( "Failed to evaluate expression", e );
                 }
             }
         }
 
         if ( val == null )
         {
             val = super.getPropertyHook( ns, name, user );
 
             if ( val == null )
             {
                 val = System.getProperty( name.toString() );
             }
         }
 
         return val;
     }
 
     /**
      * @deprecated added to keep backwards compatibility
      * @param ns
      * @param name
      * @param user
      * @param mavenProject
      * @return The property value.
      */
     private Object getPropertyHook( String ns, String name, boolean user, MavenProject mavenProject )
     {
         Object val = null;
         try
         {
             if ( name.startsWith( DEPENDENCY_PREFIX ) )
             {
                 val = (String) artifactMap.get( name );
             }
             else if ( name.startsWith( "project." ) )
             {
                 val = ReflectionValueExtractor.evaluate(
                     name,
                     mavenProject,
                     true
                 );
             }
             else if ( name.equals( "basedir" ) )
             {
                 val = ReflectionValueExtractor.evaluate(
                     "basedir.path",
                     mavenProject,
                     false
                 );
             }
         }
         catch ( Exception e )
         {
             if ( log.isWarnEnabled() )
             {
                 log.warn( "Error evaluating expression '" + name + "'", e );
             }
         }
 
         if ( val == null )
         {
             val = super.getPropertyHook( ns, name, user );
             if ( val == null )
             {
                 val = System.getProperty( name.toString() );
             }
         }
 
         if ( val instanceof File )
         {
             val = ( (File) val ).getAbsoluteFile();
         }
 
         return val;
     }
 }