NewAlexWizard.java

/**
 * (c) 2011, Alejandro Serrano
 * Released under the terms of the EPL.
 */
package net.sf.eclipsefp.haskell.ui.wizards;

import java.io.IOException;
import java.io.InputStream;
import net.sf.eclipsefp.haskell.core.code.ModuleCreationInfo;
import net.sf.eclipsefp.haskell.ui.HaskellUIPlugin;
import net.sf.eclipsefp.haskell.ui.internal.util.UITexts;
import org.eclipse.core.resources.IFile;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.INewWizard;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.actions.WorkspaceModifyDelegatingOperation;

/**
 * Wizard for creating new Alex files.
 * @author Alejandro Serrano
 *
 */
public class NewAlexWizard extends RevealAtEndWizard implements INewWizard {

  public static final String ID = NewAlexWizard.class.getName();
  static final String FILE_NAME = "/newFiles/alex.x";

  private IStructuredSelection selection;
  private NewPartitionedWizardPage page0;
  private ModuleInclusionPage page1;

  public NewAlexWizard() {
    super();
    setNeedsProgressMonitor( true );
    setWindowTitle( UITexts.new_alex );
    setDialogSettings( HaskellUIPlugin.getDefault().getDialogSettings() );
  }

  @Override
  public void init( final IWorkbench workbench, final IStructuredSelection selection ) {
    this.selection = selection;
  }

  @Override
  public void addPages() {
    super.addPages();
    page0 = new NewPartitionedWizardPage( "NewAlexPage", UITexts.new_alex, UITexts.alex_newFile );
    addPage( page0 );
    page0.init( selection );
    page1 = new ModuleInclusionPage();
    addPage( page1 );
  }

  @Override
  public boolean performFinish() {
    ModuleCreationInfo mci = page0.getInfo();
    // the user hasn't clicked on next
    if( !page1.getModuleInclusionComposite().isInit() ) {
      page1.setPreviousPage( page0 );
    }
    page1.getModuleInclusionComposite().populateInfo( mci );
    TemplateFileCreationOperation mco = new TemplateFileCreationOperation( mci, getInitialContents(), "x" );

    IRunnableWithProgress op = new WorkspaceModifyDelegatingOperation( mco );
    boolean result = false;
    try {
      getContainer().run( false, true, op );
      result = true;
      finish( mco.getGeneratedFile() );
    } catch( Exception ex ) {
      handleFinishException( ex );
      HaskellUIPlugin.log( "Error creating new module.", ex );
    }
    return result;
  }

  // helping methods
  // ////////////////

  private void handleFinishException( final Exception ex ) {
    String msg = "The following error occured: " + ex.getLocalizedMessage()
        + "Please see workspace/.metadata/.log for more information.";
    MessageDialog.openError( getShell(), "Problem occured", msg );
  }

  private void finish( final IFile createdFile ) {
    if( createdFile != null ) {
      selectAndReveal( createdFile );
      openResource( createdFile );
    }
  }

  protected InputStream getInitialContents() {
    try {
      return HaskellUIPlugin.getDefault().getBundle().getEntry(FILE_NAME).openStream();
    } catch( IOException ex ) {
      // This should never happen
      return null;
    }
  }

}