[MPLUGIN-110] Amend API to pass PluginToolsRequest around instead of project and pluginDescriptor. This will allow expansion of parameter passing in the future to include things like encoding, etc.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugin-tools/trunk@746360 13f79535-47bb-0310-9956-ffa450edef68

maven-plugin-plugin/pom.xml

@@ -61,7 +61,7 @@
   <properties>
     <doxiaVersion>1.0-alpha-10</doxiaVersion>
     <doxia-sitetoolsVersion>1.0-alpha-10</doxia-sitetoolsVersion>
-    <pluginToolsVersion>2.5-SNAPSHOT</pluginToolsVersion>
+    <pluginToolsVersion>[2.5-SNAPSHOT,)</pluginToolsVersion>
   </properties>
 
   <!-- Copy from project up -->

maven-plugin-plugin/src/main/java/org/apache/maven/plugin/plugin/AbstractGeneratorMojo.java

@@ -24,6 +24,8 @@ import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugin.descriptor.InvalidPluginDescriptorException;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.apache.maven.project.MavenProject;
+import org.apache.maven.tools.plugin.DefaultPluginToolsRequest;
+import org.apache.maven.tools.plugin.PluginToolsRequest;
 import org.apache.maven.tools.plugin.extractor.ExtractionException;
 import org.apache.maven.tools.plugin.generator.Generator;
 import org.apache.maven.tools.plugin.scanner.MojoScanner;
@@ -145,7 +147,9 @@ public abstract class AbstractGeneratorMojo
         {
             pluginDescriptor.setDependencies( PluginUtils.toComponentDependencies( project.getRuntimeDependencies() ) );
             
-            mojoScanner.populatePluginDescriptor( project, pluginDescriptor );
+            PluginToolsRequest request = new DefaultPluginToolsRequest( project, pluginDescriptor );
+
+            mojoScanner.populatePluginDescriptor( request );
 
             getOutputDirectory().mkdirs();
 

maven-plugin-tools-ant/src/main/java/org/apache/maven/tools/plugin/extractor/ant/AntMojoDescriptorExtractor.java

@@ -22,11 +22,11 @@ package org.apache.maven.tools.plugin.extractor.ant;
 import org.apache.maven.plugin.descriptor.InvalidPluginDescriptorException;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.Parameter;
-import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.apache.maven.plugin.tools.model.PluginMetadataParseException;
 import org.apache.maven.plugin.tools.model.PluginMetadataParser;
 import org.apache.maven.project.MavenProject;
 import org.apache.maven.project.path.PathTranslator;
+import org.apache.maven.tools.plugin.PluginToolsRequest;
 import org.apache.maven.tools.plugin.extractor.AbstractScriptedMojoDescriptorExtractor;
 import org.apache.maven.tools.plugin.extractor.ExtractionException;
 import org.codehaus.plexus.component.repository.ComponentRequirement;
@@ -56,7 +56,7 @@ public class AntMojoDescriptorExtractor
     
     /** {@inheritDoc} */
     protected List extractMojoDescriptorsFromMetadata( Map metadataFilesKeyedByBasedir,
-                                                       PluginDescriptor pluginDescriptor )
+                                                       PluginToolsRequest request )
         throws ExtractionException, InvalidPluginDescriptorException
     {
         List descriptors = new ArrayList();
@@ -218,7 +218,7 @@ public class AntMojoDescriptorExtractor
                         descriptor.setComponentComposer( "map-oriented" );
                         descriptor.setComponentConfigurator( "map-oriented" );
 
-                        descriptor.setPluginDescriptor( pluginDescriptor );
+                        descriptor.setPluginDescriptor( request.getPluginDescriptor() );
 
                         descriptors.add( descriptor );
                     }
@@ -234,13 +234,13 @@ public class AntMojoDescriptorExtractor
     }
 
     /** {@inheritDoc} */
-    protected String getScriptFileExtension()
+    protected String getScriptFileExtension( PluginToolsRequest request )
     {
         return SCRIPT_FILE_EXTENSION;
     }
 
     /** {@inheritDoc} */
-    protected String getMetadataFileExtension()
+    protected String getMetadataFileExtension( PluginToolsRequest request )
     {
         return METADATA_FILE_EXTENSION;
     }

maven-plugin-tools-ant/src/test/java/org/apache/maven/tools/plugin/extractor/ant/AntMojoDescriptorExtractorTest.java

@@ -4,7 +4,10 @@ import org.apache.maven.plugin.descriptor.InvalidPluginDescriptorException;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.Parameter;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
+import org.apache.maven.project.MavenProject;
 import org.apache.maven.project.path.PathTranslator;
+import org.apache.maven.tools.plugin.DefaultPluginToolsRequest;
+import org.apache.maven.tools.plugin.PluginToolsRequest;
 import org.apache.maven.tools.plugin.extractor.ExtractionException;
 import org.codehaus.plexus.component.repository.ComponentRequirement;
 import org.codehaus.plexus.util.StringUtils;
@@ -36,7 +39,9 @@ public class AntMojoDescriptorExtractorTest
         pd.setVersion( "1" );
         pd.setGoalPrefix( "mytest" );
         
-        List metadata = new AntMojoDescriptorExtractor().extractMojoDescriptorsFromMetadata( scriptMap, pd );
+        PluginToolsRequest request = new DefaultPluginToolsRequest( new MavenProject(), pd );
+        
+        List metadata = new AntMojoDescriptorExtractor().extractMojoDescriptorsFromMetadata( scriptMap, request );
         
         assertEquals( 2, metadata.size() );
         

maven-plugin-tools-api/src/main/java/org/apache/maven/tools/plugin/DefaultPluginToolsRequest.java

@@ -0,0 +1,43 @@
+package org.apache.maven.tools.plugin;
+
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+import org.apache.maven.plugin.descriptor.PluginDescriptor;
+import org.apache.maven.project.MavenProject;
+
+/**
+ * Default implementation of {@link PluginToolsRequest}, which is used to pass parameters to components
+ * used to extract {@link MojoDescriptor} instances from different types of metadata for a given
+ * plugin.
+ * 
+ * @author jdcasey
+ */
+public class DefaultPluginToolsRequest
+    implements PluginToolsRequest
+{
+
+    private PluginDescriptor pluginDescriptor;
+    private MavenProject project;
+    
+    public DefaultPluginToolsRequest( MavenProject project, PluginDescriptor pluginDescriptor )
+    {
+        this.project = project;
+        this.pluginDescriptor = pluginDescriptor;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public PluginDescriptor getPluginDescriptor()
+    {
+        return pluginDescriptor;
+    }
+    
+    /**
+     * {@inheritDoc}
+     */
+    public MavenProject getProject()
+    {
+        return project;
+    }
+
+}

maven-plugin-tools-api/src/main/java/org/apache/maven/tools/plugin/PluginToolsRequest.java

@@ -0,0 +1,27 @@
+package org.apache.maven.tools.plugin;
+
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+import org.apache.maven.plugin.descriptor.PluginDescriptor;
+import org.apache.maven.project.MavenProject;
+
+/**
+ * Request that encapsulates all information relevant to the process of extracting {@link MojoDescriptor}
+ * instances from metadata for a certain type of mojo.
+ * 
+ * @author jdcasey
+ */
+public interface PluginToolsRequest
+{
+    
+    /**
+     * Return the current {@link MavenProject} instance in use.
+     */
+    MavenProject getProject();
+    
+    /**
+     * Return the {@link PluginDescriptor} currently being populated as part of the build of the
+     * current plugin project.
+     */
+    PluginDescriptor getPluginDescriptor();
+
+}

maven-plugin-tools-api/src/main/java/org/apache/maven/tools/plugin/extractor/AbstractScriptedMojoDescriptorExtractor.java

@@ -22,6 +22,8 @@ package org.apache.maven.tools.plugin.extractor;
 import org.apache.maven.plugin.descriptor.InvalidPluginDescriptorException;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.apache.maven.project.MavenProject;
+import org.apache.maven.tools.plugin.DefaultPluginToolsRequest;
+import org.apache.maven.tools.plugin.PluginToolsRequest;
 import org.codehaus.plexus.logging.AbstractLogEnabled;
 import org.codehaus.plexus.util.DirectoryScanner;
 import org.codehaus.plexus.util.FileUtils;
@@ -47,28 +49,37 @@ public abstract class AbstractScriptedMojoDescriptorExtractor
     /** {@inheritDoc} */
     public List execute( MavenProject project, PluginDescriptor pluginDescriptor )
         throws ExtractionException, InvalidPluginDescriptorException
+    {
+        return execute( new DefaultPluginToolsRequest( project, pluginDescriptor ) );
+    }
+    
+    /** {@inheritDoc} */
+    public List execute( PluginToolsRequest request )
+        throws ExtractionException, InvalidPluginDescriptorException
     {
         getLogger().debug( "Running: " + getClass().getName() );
-        String metadataExtension = getMetadataFileExtension();
+        String metadataExtension = getMetadataFileExtension( request );
-        String scriptExtension = getScriptFileExtension();
+        String scriptExtension = getScriptFileExtension( request );
+        
+        MavenProject project = request.getProject();
 
         Map scriptFilesKeyedByBasedir =
-            gatherFilesByBasedir( project.getBasedir(), project.getScriptSourceRoots(), scriptExtension );
+            gatherFilesByBasedir( project.getBasedir(), project.getScriptSourceRoots(), scriptExtension, request );
 
         List mojoDescriptors;
         if ( !StringUtils.isEmpty( metadataExtension ) )
         {
             Map metadataFilesKeyedByBasedir =
-                gatherFilesByBasedir( project.getBasedir(), project.getScriptSourceRoots(), metadataExtension );
+                gatherFilesByBasedir( project.getBasedir(), project.getScriptSourceRoots(), metadataExtension, request );
 
-            mojoDescriptors = extractMojoDescriptorsFromMetadata( metadataFilesKeyedByBasedir, pluginDescriptor );
+            mojoDescriptors = extractMojoDescriptorsFromMetadata( metadataFilesKeyedByBasedir, request );
         }
         else
         {
-            mojoDescriptors = extractMojoDescriptors( scriptFilesKeyedByBasedir, pluginDescriptor );
+            mojoDescriptors = extractMojoDescriptors( scriptFilesKeyedByBasedir, request );
         }
 
-        copyScriptsToOutputDirectory( scriptFilesKeyedByBasedir, project.getBuild().getOutputDirectory() );
+        copyScriptsToOutputDirectory( scriptFilesKeyedByBasedir, project.getBuild().getOutputDirectory(), request );
 
         return mojoDescriptors;
     }
@@ -78,7 +89,7 @@ public abstract class AbstractScriptedMojoDescriptorExtractor
      * @param outputDirectory not null
      * @throws ExtractionException if any
      */
-    protected void copyScriptsToOutputDirectory( Map scriptFilesKeyedByBasedir, String outputDirectory )
+    protected void copyScriptsToOutputDirectory( Map scriptFilesKeyedByBasedir, String outputDirectory, PluginToolsRequest request )
         throws ExtractionException
     {
         File outputDir = new File( outputDirectory );
@@ -133,7 +144,7 @@ public abstract class AbstractScriptedMojoDescriptorExtractor
      * @param scriptFileExtension not null
      * @return map with subdirs paths as key
      */
-    protected Map gatherFilesByBasedir( File basedir, List directories, String scriptFileExtension )
+    protected Map gatherFilesByBasedir( File basedir, List directories, String scriptFileExtension, PluginToolsRequest request )
     {
         Map sourcesByBasedir = new TreeMap();
 
@@ -191,7 +202,7 @@ public abstract class AbstractScriptedMojoDescriptorExtractor
      * @throws InvalidPluginDescriptorException if any
      */
     protected List extractMojoDescriptorsFromMetadata( Map metadataFilesKeyedByBasedir,
-                                                       PluginDescriptor pluginDescriptor )
+                                                       PluginToolsRequest request )
         throws ExtractionException, InvalidPluginDescriptorException
     {
         return null;
@@ -202,7 +213,7 @@ public abstract class AbstractScriptedMojoDescriptorExtractor
      *
      * @return always null
      */
-    protected String getMetadataFileExtension()
+    protected String getMetadataFileExtension( PluginToolsRequest request )
     {
         return null;
     }
@@ -216,7 +227,7 @@ public abstract class AbstractScriptedMojoDescriptorExtractor
      * @throws ExtractionException if any
      * @throws InvalidPluginDescriptorException if any
      */
-    protected List extractMojoDescriptors( Map scriptFilesKeyedByBasedir, PluginDescriptor pluginDescriptor )
+    protected List extractMojoDescriptors( Map scriptFilesKeyedByBasedir, PluginToolsRequest request )
         throws ExtractionException, InvalidPluginDescriptorException
     {
         return null;
@@ -225,6 +236,6 @@ public abstract class AbstractScriptedMojoDescriptorExtractor
     /**
      * @return the file extension like <code>.bsh</code> for BeanShell.
      */
-    protected abstract String getScriptFileExtension();
+    protected abstract String getScriptFileExtension( PluginToolsRequest request );
 
 }

maven-plugin-tools-api/src/main/java/org/apache/maven/tools/plugin/extractor/MojoDescriptorExtractor.java

@@ -22,6 +22,7 @@ package org.apache.maven.tools.plugin.extractor;
 import org.apache.maven.plugin.descriptor.InvalidPluginDescriptorException;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.apache.maven.project.MavenProject;
+import org.apache.maven.tools.plugin.PluginToolsRequest;
 
 import java.util.List;
 
@@ -34,15 +35,28 @@ public interface MojoDescriptorExtractor
     /** Plexus role for lookup */
     String ROLE = MojoDescriptorExtractor.class.getName();
 
+
     /**
      * Execute the mojo extraction.
      *
-     * @param project not null Maven project
+     * @return a list of mojo descriptors.
-     * @param pluginDescriptor not null plugin descriptor
+     * @throws ExtractionException if any
+     * @throws InvalidPluginDescriptorException if any
+     * 
+     * @deprecated Use {@link MojoDescriptorExtractor#execute(PluginToolsRequest)} instead. 
+     *     Provided for backward compatibility with maven-plugin-plugin < 2.5.
+     */
+    List execute( MavenProject project, PluginDescriptor pluginDescriptor )
+        throws ExtractionException, InvalidPluginDescriptorException;
+    
+    /**
+     * Execute the mojo extraction.
+     *
+     * @param request The {@link PluginToolsRequest} containing information for the extraction process.
      * @return a list of mojo descriptors.
      * @throws ExtractionException if any
      * @throws InvalidPluginDescriptorException if any
      */
-    List execute( MavenProject project, PluginDescriptor pluginDescriptor )
+    List execute( PluginToolsRequest request )
         throws ExtractionException, InvalidPluginDescriptorException;
 }

maven-plugin-tools-api/src/main/java/org/apache/maven/tools/plugin/scanner/DefaultMojoScanner.java

@@ -23,6 +23,8 @@ import org.apache.maven.plugin.descriptor.InvalidPluginDescriptorException;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.apache.maven.project.MavenProject;
+import org.apache.maven.tools.plugin.DefaultPluginToolsRequest;
+import org.apache.maven.tools.plugin.PluginToolsRequest;
 import org.apache.maven.tools.plugin.extractor.ExtractionException;
 import org.apache.maven.tools.plugin.extractor.MojoDescriptorExtractor;
 import org.codehaus.plexus.logging.AbstractLogEnabled;
@@ -73,6 +75,13 @@ public class DefaultMojoScanner
     /** {@inheritDoc} */
     public void populatePluginDescriptor( MavenProject project, PluginDescriptor pluginDescriptor )
         throws ExtractionException, InvalidPluginDescriptorException
+    {
+        populatePluginDescriptor( new DefaultPluginToolsRequest( project, pluginDescriptor ) );
+    }
+    
+    /** {@inheritDoc} */
+    public void populatePluginDescriptor( PluginToolsRequest request )
+        throws ExtractionException, InvalidPluginDescriptorException
     {
         Logger logger = getLogger();
         Set activeExtractorsInternal = getActiveExtractors();
@@ -93,7 +102,7 @@ public class DefaultMojoScanner
 
             logger.info( "Applying mojo extractor for language: " + language );
 
-            List extractorDescriptors = extractor.execute( project, pluginDescriptor );
+            List extractorDescriptors = extractor.execute( request );
 
             logger.info( "Mojo extractor for language: " + language + " found " + extractorDescriptors.size()
                 + " mojo descriptors." );
@@ -105,9 +114,9 @@ public class DefaultMojoScanner
 
                 logger.debug( "Adding mojo: " + descriptor + " to plugin descriptor." );
 
-                descriptor.setPluginDescriptor( pluginDescriptor );
+                descriptor.setPluginDescriptor( request.getPluginDescriptor() );
 
-                pluginDescriptor.addMojo( descriptor );
+                request.getPluginDescriptor().addMojo( descriptor );
             }
         }
 

maven-plugin-tools-api/src/main/java/org/apache/maven/tools/plugin/scanner/MojoScanner.java

@@ -22,6 +22,7 @@ package org.apache.maven.tools.plugin.scanner;
 import org.apache.maven.plugin.descriptor.InvalidPluginDescriptorException;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.apache.maven.project.MavenProject;
+import org.apache.maven.tools.plugin.PluginToolsRequest;
 import org.apache.maven.tools.plugin.extractor.ExtractionException;
 
 import java.util.Set;
@@ -40,10 +41,21 @@ public interface MojoScanner
      * @param pluginDescriptor not null
      * @throws ExtractionException if any
      * @throws InvalidPluginDescriptorException if any
+     * 
+     * @deprecated Use {@link MojoScanner#populatePluginDescriptor(PluginToolsRequest)} instead. 
+     *     Provided for backward compatibility with maven-plugin-plugin < 2.5.
      */
     void populatePluginDescriptor( MavenProject project, PluginDescriptor pluginDescriptor )
         throws ExtractionException, InvalidPluginDescriptorException;
 
+    /**
+     * @param project not null
+     * @param pluginDescriptor not null
+     * @throws ExtractionException if any
+     * @throws InvalidPluginDescriptorException if any
+     */
+    void populatePluginDescriptor( PluginToolsRequest request )
+        throws ExtractionException, InvalidPluginDescriptorException;
 
     /**
      * Sets the active extractors.

maven-plugin-tools-api/src/test/java/org/apache/maven/tools/plugin/scanner/ScannerTestExtractor.java

@@ -19,9 +19,13 @@ package org.apache.maven.tools.plugin.scanner;
  * under the License.
  */
 
+import org.apache.maven.plugin.descriptor.InvalidPluginDescriptorException;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.apache.maven.project.MavenProject;
+import org.apache.maven.tools.plugin.DefaultPluginToolsRequest;
+import org.apache.maven.tools.plugin.PluginToolsRequest;
+import org.apache.maven.tools.plugin.extractor.ExtractionException;
 import org.apache.maven.tools.plugin.extractor.MojoDescriptorExtractor;
 
 import java.util.Collections;
@@ -41,9 +45,16 @@ public class ScannerTestExtractor
     }
 
     public List execute( MavenProject project, PluginDescriptor pluginDescriptor )
+        throws InvalidPluginDescriptorException, ExtractionException
+    {
+        return execute( new DefaultPluginToolsRequest( project, pluginDescriptor ) );
+    }
+
+    public List execute( PluginToolsRequest request )
+        throws ExtractionException, InvalidPluginDescriptorException
     {
             MojoDescriptor desc = new MojoDescriptor();
-        desc.setPluginDescriptor( pluginDescriptor );
+            desc.setPluginDescriptor( request.getPluginDescriptor() );
             desc.setGoal( goal );
 
             return Collections.singletonList( desc );

maven-plugin-tools-api/src/test/java/org/apache/maven/tools/plugin/scanner/TestExtractor.java

@@ -22,6 +22,8 @@ package org.apache.maven.tools.plugin.scanner;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.apache.maven.project.MavenProject;
+import org.apache.maven.tools.plugin.DefaultPluginToolsRequest;
+import org.apache.maven.tools.plugin.PluginToolsRequest;
 import org.apache.maven.tools.plugin.extractor.MojoDescriptorExtractor;
 
 import java.util.Collections;
@@ -35,9 +37,14 @@ public class TestExtractor
 {
 
     public List execute( MavenProject project, PluginDescriptor pluginDescriptor )
+    {
+        return execute( new DefaultPluginToolsRequest( project, pluginDescriptor ) );
+    }
+    
+    public List execute( PluginToolsRequest request )
     {
         MojoDescriptor desc = new MojoDescriptor();
-        desc.setPluginDescriptor( pluginDescriptor );
+        desc.setPluginDescriptor( request.getPluginDescriptor() );
         desc.setGoal( "testGoal" );
 
         return Collections.singletonList( desc );

maven-plugin-tools-beanshell/src/main/java/org/apache/maven/tools/plugin/extractor/beanshell/BeanshellMojoDescriptorExtractor.java

@@ -24,6 +24,7 @@ import bsh.Interpreter;
 import org.apache.maven.plugin.descriptor.InvalidPluginDescriptorException;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
+import org.apache.maven.tools.plugin.PluginToolsRequest;
 import org.apache.maven.tools.plugin.extractor.AbstractScriptedMojoDescriptorExtractor;
 import org.apache.maven.tools.plugin.extractor.ExtractionException;
 
@@ -49,13 +50,13 @@ public class BeanshellMojoDescriptorExtractor
     extends AbstractScriptedMojoDescriptorExtractor
 {
     /** {@inheritDoc} */
-    protected String getScriptFileExtension()
+    protected String getScriptFileExtension( PluginToolsRequest request )
     {
         return ".bsh";
     }
 
     /** {@inheritDoc} */
-    protected List extractMojoDescriptors( Map scriptFilesKeyedByBasedir, PluginDescriptor pluginDescriptor )
+    protected List extractMojoDescriptors( Map scriptFilesKeyedByBasedir, PluginToolsRequest request )
         throws ExtractionException, InvalidPluginDescriptorException
     {
         List descriptors = new ArrayList();
@@ -82,7 +83,7 @@ public class BeanshellMojoDescriptorExtractor
 
                 relativePath = relativePath.replace( '\\', '/' );
 
-                MojoDescriptor mojoDescriptor = createMojoDescriptor( basedir, relativePath, pluginDescriptor );
+                MojoDescriptor mojoDescriptor = createMojoDescriptor( basedir, relativePath, request.getPluginDescriptor() );
                 descriptors.add( mojoDescriptor );
             }
         }

maven-plugin-tools-java/src/main/java/org/apache/maven/tools/plugin/extractor/java/JavaMojoDescriptorExtractor.java

@@ -32,6 +32,8 @@ import org.apache.maven.plugin.descriptor.Parameter;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.apache.maven.plugin.descriptor.Requirement;
 import org.apache.maven.project.MavenProject;
+import org.apache.maven.tools.plugin.DefaultPluginToolsRequest;
+import org.apache.maven.tools.plugin.PluginToolsRequest;
 import org.apache.maven.tools.plugin.extractor.MojoDescriptorExtractor;
 import org.apache.maven.tools.plugin.extractor.ExtractionException;
 
@@ -580,7 +582,14 @@ public class JavaMojoDescriptorExtractor
     public List execute( MavenProject project, PluginDescriptor pluginDescriptor )
         throws ExtractionException, InvalidPluginDescriptorException
     {
-        JavaClass[] javaClasses = discoverClasses( project );
+        return execute( new DefaultPluginToolsRequest( project, pluginDescriptor ) );
+    }
+    
+    /** {@inheritDoc} */
+    public List execute( PluginToolsRequest request )
+        throws ExtractionException, InvalidPluginDescriptorException
+    {
+        JavaClass[] javaClasses = discoverClasses( request.getProject() );
 
         List descriptors = new ArrayList();
 
@@ -591,7 +600,7 @@ public class JavaMojoDescriptorExtractor
             if ( tag != null )
             {
                 MojoDescriptor mojoDescriptor = createMojoDescriptor( javaClasses[i] );
-                mojoDescriptor.setPluginDescriptor( pluginDescriptor );
+                mojoDescriptor.setPluginDescriptor( request.getPluginDescriptor() );
 
                 // Validate the descriptor as best we can before allowing it to be processed.
                 validate( mojoDescriptor );

pom.xml

@@ -154,7 +154,7 @@
       <dependency>
         <groupId>org.apache.maven.plugin-tools</groupId>
         <artifactId>maven-plugin-tools-api</artifactId>
-        <version>${pluginToolsVersion}</version>
+        <version>[${pluginToolsVersion},)</version>
       </dependency>
       <dependency>
         <groupId>org.apache.maven.plugin-tools</groupId>