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  package org.apache.cayenne.tools;
  
  import java.io.File;
  
  import org.apache.cayenne.modeler.generic.GenericMain;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.apache.maven.project.MavenProject;
  
  /**
   * Maven mojo to start up the Cayenne modeler from the command-line.
   * 
   * @since 3.0
   * 
   * @prefix cayenne-modeler
   * @goal run
   */
  public class CayenneModelerMojo extends AbstractMojo {
  
  	/**
  	 * Name of the model file to open.
  	 * 
  	 * @parameter expression="${modeler.modelFile}
  	 */
  	private File modelFile;
  
  	/**
  	 * Project instance.
  	 * 
  	 * @parameter default-value="${project}"
  	 * @required
  	 * @readonly
  	 */
  	private MavenProject project;
  
  	private File lookupModelFile() {
  		if (modelFile != null && modelFile.isFile()) {
  			return modelFile;
  		}
  
  		return null;
  	}
  
  	public void execute() throws MojoExecutionException, MojoFailureException {
  		// setup the system property to tell the modeler where to generate the
  		// java source files.
  		System.setProperty("cayenne.cgen.destdir", project.getBuild()
  				.getSourceDirectory());
  
  		// start the modeler with the provided model file, if it exists.
  		File f = lookupModelFile();
  		if (f != null && f.exists() && !f.isDirectory()) {
  			GenericMain.main(new String[] { f.getAbsolutePath() });
  		} else {
  			GenericMain.main(new String[] {});
  		}
  
  		// Block until the modeler finishes executing.
  		try {
  			Thread.currentThread().join();
  		} catch (InterruptedException e) {
  			e.printStackTrace();
  		}
  	}
  }
  