package org.codehaus.gmavenplus.mojo;
   
   import org.apache.maven.artifact.DependencyResolutionRequiredException;
   import org.apache.maven.plugin.MojoExecutionException;
   import org.apache.maven.plugins.annotations.LifecyclePhase;
   import org.apache.maven.plugins.annotations.Mojo;
   import org.apache.maven.plugins.annotations.Parameter;
   import org.apache.maven.plugins.annotations.ResolutionScope;
   import org.apache.maven.shared.model.fileset.FileSet;
  
  import java.io.File;
  import java.lang.reflect.InvocationTargetException;
  import java.net.MalformedURLException;
  
  
  /**
   * Generates stubs for the main Groovy sources and adds them to Maven's sources for the Maven compiler plugin to find.
   * Note that this mojo requires Groovy >= 1.8.2.
   *
   * @author Keegan Witt
   * @since 1.0-beta-1
   */
  @Mojo(name = "generateStubs", defaultPhase = LifecyclePhase.GENERATE_SOURCES, requiresDependencyResolution = ResolutionScope.COMPILE, threadSafe = true)
  public class GenerateStubsMojo extends AbstractGenerateStubsMojo {
  
      /**
       * The Groovy source files (relative paths).
       * Default: "${project.basedir}/src/main/groovy/**/*.groovy"
       */
      @Parameter
      protected FileSet[] sources;
  
      /**
       * The location for the compiled classes.
       */
      @Parameter(defaultValue = "${project.build.directory}/generated-sources/groovy-stubs/main")
      protected File stubsOutputDirectory;
  
      /**
       * Executes this mojo.
       *
       * @throws MojoExecutionException If an unexpected problem occurs (causes a "BUILD ERROR" message to be displayed)
       */
      @Override
      public void execute() throws MojoExecutionException {
          minGroovyVersion = GROOVY_1_8_2;
  
          try {
              try {
                  getLog().debug("Project compile classpath:\n" + project.getCompileClasspathElements());
              } catch (DependencyResolutionRequiredException e) {
                  getLog().debug("Unable to log project compile classpath");
              }
  
              doStubGeneration(getFiles(sources, false), project.getCompileClasspathElements(), stubsOutputDirectory);
              logGeneratedStubs(stubsOutputDirectory);
              resetStubModifiedDates(getStubs(stubsOutputDirectory));
  
              // add stubs to project source so the Maven Compiler Plugin can find them
              project.addCompileSourceRoot(stubsOutputDirectory.getAbsolutePath());
          } catch (ClassNotFoundException e) {
              throw new MojoExecutionException("Unable to get a Groovy class from classpath (" + e.getMessage() + "). Do you have Groovy as a compile dependency in your project?", e);
          } catch (InvocationTargetException e) {
              throw new MojoExecutionException("Error occurred while calling a method on a Groovy class from classpath.", e);
          } catch (InstantiationException e) {
              throw new MojoExecutionException("Error occurred while instantiating a Groovy class from classpath.", e);
          } catch (IllegalAccessException e) {
              throw new MojoExecutionException("Unable to access a method on a Groovy class from classpath.", e);
          } catch (DependencyResolutionRequiredException e) {
              throw new MojoExecutionException("Compile dependencies weren't resolved.", e);
          } catch (MalformedURLException e) {
              throw new MojoExecutionException("Unable to add project compile dependencies to classpath.", e);
          }
      }
  
  }