package org.apache.maven.plugin.testing;
   
   /*
    * 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.codehaus.plexus.PlexusTestCase;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
  import org.apache.maven.artifact.repository.DefaultArtifactRepository;
  import org.apache.maven.artifact.repository.layout.DefaultRepositoryLayout;
  
  /**
   * Stub for {@link ExpressionEvaluator}
   *
   * @author jesse
   * @version $Id$
   */
  public class ResolverExpressionEvaluatorStub
      implements ExpressionEvaluator
  {
      /** {@inheritDoc} */
      public Object evaluate( String expr )
          throws ExpressionEvaluationException
      {
  
          Object value = null;
  
          if ( expr == null )
          {
              return null;
          }
  
          String expression = stripTokens( expr );
  
          if ( expression.equals( expr ) )
          {
              int index = expr.indexOf( "${" );
              if ( index >= 0 )
              {
                  int lastIndex = expr.indexOf( "}", index );
                  if ( lastIndex >= 0 )
                  {
                      String retVal = expr.substring( 0, index );
  
                      if ( index > 0 && expr.charAt( index - 1 ) == '$' )
                      {
                          retVal += expr.substring( index + 1, lastIndex + 1 );
                      }
                      else
                      {
                          retVal += evaluate( expr.substring( index, lastIndex + 1 ) );
                      }
  
                      retVal += evaluate( expr.substring( lastIndex + 1 ) );
                      return retVal;
                  }
              }
  
              // Was not an expression
              if ( expression.indexOf( "$$" ) > -1 )
              {
                  return expression.replaceAll( "\\$\\$", "\\$" );
              }
          }
  
          if ( "basedir".equals( expression ) )
          {
              return PlexusTestCase.getBasedir();
          }
          else if ( expression.startsWith( "basedir" ) )
          {
              int pathSeparator = expression.indexOf( "/" );
  
              if ( pathSeparator > 0 )
              {
                  value = PlexusTestCase.getBasedir() + expression.substring( pathSeparator );
              }
              else
              {
                  System.out.println( "Got expression '" + expression + "' that was not recognised" );
              }
             return value;
         }
         else if ( "localRepository".equals( expression ) )
         {
             File localRepo = new File( PlexusTestCase.getBasedir(), "target/local-repo" );
             return new DefaultArtifactRepository( "localRepository", "file://" + localRepo.getAbsolutePath(),
                                                   new DefaultRepositoryLayout() );
         }
         else
         {
             return expr;
         }
     }
 
     private String stripTokens( String expr )
     {
         if ( expr.startsWith( "${" ) && expr.indexOf( "}" ) == expr.length() - 1 )
         {
             expr = expr.substring( 2, expr.length() - 1 );
         }
 
         return expr;
     }
 
     /** {@inheritDoc} */
     public File alignToBaseDirectory( File file )
     {
         if ( file.getAbsolutePath().startsWith( PlexusTestCase.getBasedir() ) )
         {
             return file;
         }
         else if ( file.isAbsolute() )
         {
             return file;
         }
         else
         {
             return new File( PlexusTestCase.getBasedir(), file.getPath() );
         }
     }
 }