package org.apache.maven.artifact.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 org.apache.tools.ant.BuildException;

 import org.apache.tools.ant.PropertyHelper;

 import org.codehaus.plexus.util.introspection.ReflectionValueExtractor;

 /**

  * The property intercepter that handles the calls for "pom." properties in Ant 1.6 - 1.7.1

  */

 class POMPropertyHelper

     extends PropertyHelper

 {

     protected final Pom pom;

     POMPropertyHelper( Pom pom )

     {

         this.pom = pom;

     }

     /**

      * The method that gets called by Ant 1.6 - 1.7.1 with every request of property

      */

     public Object getPropertyHook( String ns, String name, boolean user )

     {

         String prefix = this.pom.antId + ".";

         if ( !name.startsWith( prefix ) )

         {

             // pass on to next interceptor

             return super.getPropertyHook( ns, name, user );

         }

         try

         {

             // else handle the property resolution

             String expression = name.substring( prefix.length() );

             return getPOMValue( "project." + expression );

         }

         catch ( Exception ex )

         {

             ex.printStackTrace();

             return null;

         }

     }

     private static final String PROPERTIES_PREFIX = "project.properties.";

     protected Object getPOMValue( String expression )

     {

         Object value = null;

         try

         {

             if ( expression.startsWith( PROPERTIES_PREFIX ) )

             {

                 expression = expression.substring( PROPERTIES_PREFIX.length() );

                 value = pom.getMavenProject().getProperties().get( expression );

             }

             else

             {

                 value = ReflectionValueExtractor.evaluate( expression, pom.getMavenProject() );

             }

         }

         catch ( Exception e )

         {

             throw new BuildException( "Error extracting expression from POM", e );

         }

         return value;

     }

 }