package org.apache.maven.plugin.assembly.interpolation;
   
   /*
    * 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.plugin.assembly.AssemblerConfigurationSource;
  import org.apache.maven.plugin.assembly.utils.InterpolationConstants;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
  import org.codehaus.plexus.interpolation.InterpolationException;
  import org.codehaus.plexus.interpolation.Interpolator;
  import org.codehaus.plexus.interpolation.PrefixAwareRecursionInterceptor;
  
  public class AssemblyExpressionEvaluator
      implements ExpressionEvaluator
  {
      
      private final AssemblerConfigurationSource configSource;
      private Interpolator interpolator;
      private PrefixAwareRecursionInterceptor interceptor;
  
      public AssemblyExpressionEvaluator( AssemblerConfigurationSource configSource )
      {
          this.configSource = configSource;
          
          interpolator = AssemblyInterpolator.buildInterpolator( configSource.getProject(), configSource );
          interceptor = new PrefixAwareRecursionInterceptor( InterpolationConstants.PROJECT_PREFIXES, true );
      }
  
      public File alignToBaseDirectory( File f )
      {
          String basePath = configSource.getBasedir().getAbsolutePath();
          String path = f.getPath();
          
          if ( !f.isAbsolute() && !path.startsWith( basePath ) )
          {
              return new File( configSource.getBasedir(), path );
          }
          else
          {
              return f;
          }
      }
  
      public Object evaluate( String expression )
          throws ExpressionEvaluationException
      {
          try
          {
              return interpolator.interpolate( expression, interceptor );
          }
          catch ( InterpolationException e )
          {
              throw new ExpressionEvaluationException( "Interpolation failed for archiver expression: " + expression, e );
          }
      }
  
  }