package org.apache.maven.plugin;
   
   /*
    * 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.Properties;
  
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.plugin.descriptor.MojoDescriptor;
  import org.apache.maven.plugin.descriptor.PluginDescriptor;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.project.path.PathTranslator;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
  import org.codehaus.plexus.component.configurator.expression.TypeAwareExpressionEvaluator;
  import org.codehaus.plexus.logging.Logger;
  import org.codehaus.plexus.util.introspection.ReflectionValueExtractor;
  
  /**
   * @author Jason van Zyl
   */
  public class PluginParameterExpressionEvaluator
      implements TypeAwareExpressionEvaluator
  {
      private MavenSession session;
  
      private MojoExecution mojoExecution;
  
      private MavenProject project;
  
      private String basedir;
  
      private Properties properties;
  
      @Deprecated //TODO: used by the Enforcer plugin
      public PluginParameterExpressionEvaluator( MavenSession session, MojoExecution mojoExecution,
                                                 PathTranslator pathTranslator, Logger logger, MavenProject project,
                                                 Properties properties )
      {
          this( session, mojoExecution );
      }
  
      public PluginParameterExpressionEvaluator( MavenSession session )
      {
          this( session, null );
      }
  
      public PluginParameterExpressionEvaluator( MavenSession session, MojoExecution mojoExecution )
      {
          this.session = session;
          this.mojoExecution = mojoExecution;
          this.properties = session.getExecutionProperties();
          this.project = session.getCurrentProject();
  
          String basedir = null;
  
          if ( project != null )
          {
              File projectFile = project.getBasedir();
  
              // this should always be the case for non-super POM instances...
              if ( projectFile != null )
              {
                  basedir = projectFile.getAbsolutePath();
              }
          }
  
          if ( ( basedir == null ) && ( session != null ) )
          {
              basedir = session.getExecutionRootDirectory();
          }
  
          if ( basedir == null )
          {
              basedir = System.getProperty( "user.dir" );
          }
  
          this.basedir = basedir;
      }
  
      public Object evaluate( String expr )
          throws ExpressionEvaluationException
      {
         return evaluate( expr, null );
     }
 
     public Object evaluate( String expr, Class<?> type )
         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
                     {
                         Object subResult = evaluate( expr.substring( index, lastIndex + 1 ) );
 
                         if ( subResult != null )
                         {
                             retVal += subResult;
                         }
                         else
                         {
                             retVal += "$" + expr.substring( index + 1, lastIndex + 1 );
                         }
                     }
 
                     retVal += evaluate( expr.substring( lastIndex + 1 ) );
                     return retVal;
                 }
             }
 
             // Was not an expression
             if ( expression.indexOf( "$$" ) > -1 )
             {
                 return expression.replaceAll( "\\$\\$", "\\$" );
             }
             else
             {
                 return expression;
             }
         }
 
         MojoDescriptor mojoDescriptor = mojoExecution.getMojoDescriptor();
 
         if ( "localRepository".equals( expression ) )
         {
             value = session.getLocalRepository();
         }
         else if ( "session".equals( expression ) )
         {
             value = session;
         }
         else if ( expression.startsWith( "session" ) )
         {
             try
             {
                 int pathSeparator = expression.indexOf( "/" );
 
                 if ( pathSeparator > 0 )
                 {
                     String pathExpression = expression.substring( 1, pathSeparator );
                     value = ReflectionValueExtractor.evaluate( pathExpression, session );
                     value = value + expression.substring( pathSeparator );
                 }
                 else
                 {
                     value = ReflectionValueExtractor.evaluate( expression.substring( 1 ), session );
                 }
             }
             catch ( Exception e )
             {
                 // TODO: don't catch exception
                 throw new ExpressionEvaluationException( "Error evaluating plugin parameter expression: " + expression,
                                                          e );
             }
         }
         else if ( "reactorProjects".equals( expression ) )
         {
             value = session.getProjects();
         }
         else if ( "mojoExecution".equals( expression ) )
         {
             value = mojoExecution;
         }
         else if ( "project".equals( expression ) )
         {
             value = project;
         }
         else if ( "executedProject".equals( expression ) )
         {
             value = project.getExecutionProject();
         }
         else if ( expression.startsWith( "project" ) || expression.startsWith( "pom" ) )
         {
             try
             {
                 int pathSeparator = expression.indexOf( "/" );
 
                 if ( pathSeparator > 0 )
                 {
                     String pathExpression = expression.substring( 0, pathSeparator );
                     value = ReflectionValueExtractor.evaluate( pathExpression, project );
                     value = value + expression.substring( pathSeparator );
                 }
                 else
                 {
                     value = ReflectionValueExtractor.evaluate( expression.substring( 1 ), project );
                 }
             }
             catch ( Exception e )
             {
                 // TODO: don't catch exception
                 throw new ExpressionEvaluationException( "Error evaluating plugin parameter expression: " + expression,
                                                          e );
             }
         }
         else if ( expression.equals( "repositorySystemSession" ) )
         {
             value = session.getRepositorySession();
         }
         else if ( expression.equals( "mojo" ) )
         {
             value = mojoExecution;
         }
         else if ( expression.startsWith( "mojo" ) )
         {
             try
             {
                 int pathSeparator = expression.indexOf( "/" );
 
                 if ( pathSeparator > 0 )
                 {
                     String pathExpression = expression.substring( 1, pathSeparator );
                     value = ReflectionValueExtractor.evaluate( pathExpression, mojoExecution );
                     value = value + expression.substring( pathSeparator );
                 }
                 else
                 {
                     value = ReflectionValueExtractor.evaluate( expression.substring( 1 ), mojoExecution );
                 }
             }
             catch ( Exception e )
             {
                 // TODO: don't catch exception
                 throw new ExpressionEvaluationException( "Error evaluating plugin parameter expression: " + expression,
                                                          e );
             }
         }
         else if ( expression.equals( "plugin" ) )
         {
             value = mojoDescriptor.getPluginDescriptor();
         }
         else if ( expression.startsWith( "plugin" ) )
         {
             try
             {
                 int pathSeparator = expression.indexOf( "/" );
 
                 PluginDescriptor pluginDescriptor = mojoDescriptor.getPluginDescriptor();
 
                 if ( pathSeparator > 0 )
                 {
                     String pathExpression = expression.substring( 1, pathSeparator );
                     value = ReflectionValueExtractor.evaluate( pathExpression, pluginDescriptor );
                     value = value + expression.substring( pathSeparator );
                 }
                 else
                 {
                     value = ReflectionValueExtractor.evaluate( expression.substring( 1 ), pluginDescriptor );
                 }
             }
             catch ( Exception e )
             {
                 throw new ExpressionEvaluationException( "Error evaluating plugin parameter expression: " + expression,
                                                          e );
             }
         }
         else if ( "settings".equals( expression ) )
         {
             value = session.getSettings();
         }
         else if ( expression.startsWith( "settings" ) )
         {
             try
             {
                 int pathSeparator = expression.indexOf( "/" );
 
                 if ( pathSeparator > 0 )
                 {
                     String pathExpression = expression.substring( 1, pathSeparator );
                     value = ReflectionValueExtractor.evaluate( pathExpression, session.getSettings() );
                     value = value + expression.substring( pathSeparator );
                 }
                 else
                 {
                     value = ReflectionValueExtractor.evaluate( expression.substring( 1 ), session.getSettings() );
                 }
             }
             catch ( Exception e )
             {
                 // TODO: don't catch exception
                 throw new ExpressionEvaluationException( "Error evaluating plugin parameter expression: " + expression,
                                                          e );
             }
         }
         else if ( "basedir".equals( expression ) )
         {
             value = basedir;
         }
         else if ( expression.startsWith( "basedir" ) )
         {
             int pathSeparator = expression.indexOf( "/" );
 
             if ( pathSeparator > 0 )
             {
                 value = basedir + expression.substring( pathSeparator );
             }
         }
 
         /*
          * MNG-4312: We neither have reserved all of the above magic expressions nor is their set fixed/well-known (it
          * gets occasionally extended by newer Maven versions). This imposes the risk for existing plugins to
          * unintentionally use such a magic expression for an ordinary system property. So here we check whether we
          * ended up with a magic value that is not compatible with the type of the configured mojo parameter (a string
          * could still be converted by the configurator so we leave those alone). If so, back off to evaluating the
          * expression from properties only.
          */
         if ( value != null && type != null && !( value instanceof String ) && !isTypeCompatible( type, value ) )
         {
             value = null;
         }
 
         if ( value == null )
         {
             // The CLI should win for defining properties
 
             if ( ( value == null ) && ( properties != null ) )
             {
                 // We will attempt to get nab a system property as a way to specify a
                 // parameter to a plugins. My particular case here is allowing the surefire
                 // plugin to run a single test so I want to specify that class on the cli
                 // as a parameter.
 
                 value = properties.getProperty( expression );
             }
 
             if ( ( value == null ) && ( ( project != null ) && ( project.getProperties() != null ) ) )
             {
                 value = project.getProperties().getProperty( expression );
             }
 
         }
 
         if ( value instanceof String )
         {
             // TODO: without #, this could just be an evaluate call...
 
             String val = (String) value;
 
             int exprStartDelimiter = val.indexOf( "${" );
 
             if ( exprStartDelimiter >= 0 )
             {
                 if ( exprStartDelimiter > 0 )
                 {
                     value = val.substring( 0, exprStartDelimiter ) + evaluate( val.substring( exprStartDelimiter ) );
                 }
                 else
                 {
                     value = evaluate( val.substring( exprStartDelimiter ) );
                 }
             }
         }
 
         return value;
     }
 
     private static boolean isTypeCompatible( Class<?> type, Object value )
     {
         if ( type.isInstance( value ) )
         {
             return true;
         }
         // likely Boolean -> boolean, Short -> int etc. conversions, it's not the problem case we try to avoid
         return ( ( type.isPrimitive() || type.getName().startsWith( "java.lang." ) )
                         && value.getClass().getName().startsWith( "java.lang." ) );
     }
 
     private String stripTokens( String expr )
     {
         if ( expr.startsWith( "${" ) && ( expr.indexOf( "}" ) == expr.length() - 1 ) )
         {
             expr = expr.substring( 2, expr.length() - 1 );
         }
         return expr;
     }
 
     public File alignToBaseDirectory( File file )
     {
         // TODO: Copied from the DefaultInterpolator. We likely want to resurrect the PathTranslator or at least a
         // similar component for re-usage
         if ( file != null )
         {
             if ( file.isAbsolute() )
             {
                 // path was already absolute, just normalize file separator and we're done
             }
             else if ( file.getPath().startsWith( File.separator ) )
             {
                 // drive-relative Windows path, don't align with project directory but with drive root
                 file = file.getAbsoluteFile();
             }
             else
             {
                 // an ordinary relative path, align with project directory
                 file = new File( new File( basedir, file.getPath() ).toURI().normalize() ).getAbsoluteFile();
             }
         }
         return file;
     }
 
 }