NewWizardsActionGroup.java :  » IDE-Eclipse » jdt » org » eclipse » jdt » internal » ui » actions » Java Open Source

/*******************************************************************************
 * Copyright (c) 2000, 2009 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.ui.actions;

import java.util.Iterator;
import java.util.List;

import org.eclipse.core.resources.IResource;

import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.ui.IWorkbenchSite;
import org.eclipse.ui.IWorkingSet;
import org.eclipse.ui.actions.ActionGroup;
import org.eclipse.ui.actions.NewWizardMenu;

import org.eclipse.jdt.core.IJavaElement;

import org.eclipse.jdt.ui.IContextMenuConstants;

import org.eclipse.jdt.internal.ui.workingsets.IWorkingSetIDs;


/**
 * Action group that adds the 'new' menu to a context menu.
 * <p>
 * This class may be instantiated; it is not intended to be subclassed.
 * </p>
 *
 * @since 2.1
 */
public class NewWizardsActionGroup extends ActionGroup {

  private IWorkbenchSite fSite;

  /**
   * Creates a new <code>NewWizardsActionGroup</code>. The group requires
   * that the selection provided by the part's selection provider is of type <code>
   * org.eclipse.jface.viewers.IStructuredSelection</code>.
   *
   * @param site the view part that owns this action group
   */
  public NewWizardsActionGroup(IWorkbenchSite site) {
    fSite= site;
  }


  /* (non-Javadoc)
   * Method declared in ActionGroup
   */
  public void fillContextMenu(IMenuManager menu) {
    super.fillContextMenu(menu);

    ISelection selection= getContext().getSelection();
    if (selection instanceof IStructuredSelection) {
      if (canEnable((IStructuredSelection)selection)) {
            MenuManager newMenu = new MenuManager(ActionMessages.NewWizardsActionGroup_new);
            menu.appendToGroup(IContextMenuConstants.GROUP_NEW, newMenu);
            newMenu.add(new NewWizardMenu(fSite.getWorkbenchWindow()));
      }
    }

  }

  private boolean canEnable(IStructuredSelection sel) {
    if (sel.size() == 0)
      return true;

    List list= sel.toList();
    for (Iterator iterator= list.iterator(); iterator.hasNext();) {
      if (!isNewTarget(iterator.next()))
        return false;
    }

    return true;
  }

  private boolean isNewTarget(Object element) {
    if (element == null)
      return true;
    if (element instanceof IResource) {
      return true;
    }
    if (element instanceof IJavaElement) {
      int type= ((IJavaElement)element).getElementType();
      return type == IJavaElement.JAVA_PROJECT ||
        type == IJavaElement.PACKAGE_FRAGMENT_ROOT ||
        type == IJavaElement.PACKAGE_FRAGMENT ||
        type == IJavaElement.COMPILATION_UNIT ||
        type == IJavaElement.TYPE;
    }
    if (element instanceof IWorkingSet) {
      String workingSetId= ((IWorkingSet)element).getId();
      return
        IWorkingSetIDs.JAVA.equals(workingSetId) ||
        IWorkingSetIDs.RESOURCE.equals(workingSetId) ||
        IWorkingSetIDs.OTHERS.equals(workingSetId);
    }
    return false;
  }

}