| /******************************************************************************* |
| * Copyright (c) 2000, 2006 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.ui.internal.dialogs; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| import org.eclipse.jface.viewers.ITreeContentProvider; |
| import org.eclipse.jface.viewers.Viewer; |
| import org.eclipse.ui.activities.WorkbenchActivityHelper; |
| import org.eclipse.ui.internal.intro.IIntroConstants; |
| import org.eclipse.ui.views.IViewCategory; |
| import org.eclipse.ui.views.IViewDescriptor; |
| import org.eclipse.ui.views.IViewRegistry; |
| |
| /** |
| * Provides content for viewers that wish to show Views. |
| */ |
| public class ViewContentProvider implements ITreeContentProvider { |
| |
| /** |
| * Child cache. Map from Object->Object[]. Our hasChildren() method is |
| * expensive so it's better to cache the results of getChildren(). |
| */ |
| private Map childMap = new HashMap(); |
| |
| /** |
| * Create a new instance of the ViewContentProvider. |
| */ |
| public ViewContentProvider() { |
| //no-op |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.jface.viewers.IContentProvider#dispose() |
| */ |
| public void dispose() { |
| childMap.clear(); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object) |
| */ |
| public Object[] getChildren(Object element) { |
| Object[] children = (Object[]) childMap.get(element); |
| if (children == null) { |
| children = createChildren(element); |
| childMap.put(element, children); |
| } |
| return children; |
| } |
| |
| /** |
| * Does the actual work of getChildren. |
| * |
| * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object) |
| */ |
| private Object[] createChildren(Object element) { |
| if (element instanceof IViewRegistry) { |
| IViewRegistry reg = (IViewRegistry) element; |
| IViewCategory [] categories = reg.getCategories(); |
| |
| ArrayList filtered = new ArrayList(); |
| for (int i = 0; i < categories.length; i++) { |
| if (!hasChildren(categories[i])) { |
| continue; |
| } |
| |
| filtered.add(categories[i]); |
| } |
| categories = (IViewCategory[]) filtered.toArray(new IViewCategory[filtered |
| .size()]); |
| |
| // if there is only one category, return it's children directly |
| if (categories.length == 1) { |
| return getChildren(categories[0]); |
| } |
| return categories; |
| } else if (element instanceof IViewCategory) { |
| IViewDescriptor [] views = ((IViewCategory) element).getViews(); |
| if (views != null) { |
| ArrayList filtered = new ArrayList(); |
| for (int i = 0; i < views.length; i++) { |
| Object o = views[i]; |
| if (WorkbenchActivityHelper.filterItem(o)) { |
| continue; |
| } |
| filtered.add(o); |
| } |
| return removeIntroView(filtered).toArray(); |
| } |
| } |
| |
| return new Object[0]; |
| } |
| |
| /** |
| * Removes the temporary intro view from the list so that it cannot be activated except through |
| * the introduction command. |
| * |
| * @param list the list of view descriptors |
| * @return the modified list. |
| * @since 3.0 |
| */ |
| private ArrayList removeIntroView(ArrayList list) { |
| for (Iterator i = list.iterator(); i.hasNext();) { |
| IViewDescriptor view = (IViewDescriptor) i.next(); |
| if (view.getId().equals(IIntroConstants.INTRO_VIEW_ID)) { |
| i.remove(); |
| } |
| } |
| return list; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object) |
| */ |
| public Object[] getElements(Object element) { |
| return getChildren(element); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object) |
| */ |
| public Object getParent(Object element) { |
| return null; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object) |
| */ |
| public boolean hasChildren(java.lang.Object element) { |
| if (element instanceof IViewRegistry) { |
| return true; |
| } else if (element instanceof IViewCategory) { |
| if (getChildren(element).length > 0) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, |
| * java.lang.Object, java.lang.Object) |
| */ |
| public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { |
| childMap.clear(); |
| } |
| } |