| /******************************************************************************* |
| * Copyright (c) 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 |
| * Matthew Hall - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.ui.databinding; |
| |
| import org.eclipse.core.databinding.observable.value.IObservableValue; |
| import org.eclipse.core.runtime.Assert; |
| import org.eclipse.core.runtime.IAdapterManager; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.ui.ISelectionService; |
| import org.eclipse.ui.services.IServiceLocator; |
| |
| /** |
| * Factory methods for creating observables for Workbench objects |
| * |
| * @since 3.5 |
| */ |
| public class WorkbenchObservables { |
| /** |
| * Returns an observable with values of the given target type. If the |
| * wrapped observable's value is of the target type, or can be adapted to |
| * the target type, this is taken as the value of the returned observable, |
| * otherwise <code>null</code>. |
| * |
| * @param master |
| * the observable whose value should be adapted |
| * @param adapter |
| * the target type |
| * @return an observable with values of the given type, or <code>null</code> |
| * if the current value of the given observable does not adapt to |
| * the target type |
| */ |
| public static IObservableValue observeDetailAdaptedValue( |
| IObservableValue master, Class adapter) { |
| return observeDetailAdaptedValue(master, adapter, Platform |
| .getAdapterManager()); |
| } |
| |
| /** |
| * Returns an observable with values of the given target type. If the |
| * wrapped observable's value is of the target type, or can be adapted to |
| * the target type, this is taken as the value of the returned observable, |
| * otherwise <code>null</code>. |
| * |
| * @param master |
| * the observable whose value should be adapted |
| * @param adapter |
| * the target type |
| * @param adapterManager |
| * the adapter manager used to adapt the master value |
| * @return an observable with values of the given type, or <code>null</code> |
| * if the current value of the given observable does not adapt to |
| * the target type |
| */ |
| static IObservableValue observeDetailAdaptedValue( |
| IObservableValue master, Class adapter, |
| IAdapterManager adapterManager) { |
| return WorkbenchProperties.adaptedValue(adapter, adapterManager) |
| .observeDetail(master); |
| } |
| |
| /** |
| * Returns an observable value that tracks the post selection of a selection |
| * service obtained through the given service locator, and adapts the first |
| * element of that selection to the given target type. |
| * <p> |
| * This method can be used by view or editor implementers to tie into the |
| * selection service, for example as follows: |
| * |
| * <pre> |
| * IObservableValue selection = WorkbenchObservables |
| * .observeAdaptedSingleSelection(getSite(), IResource.class); |
| * </pre> |
| * |
| * </p> |
| * |
| * @param locator |
| * a service locator with an available {@link ISelectionService} |
| * @param targetType |
| * the target type |
| * @return an observable value whose value type is the given target type |
| */ |
| public static IObservableValue observeAdaptedSingleSelection( |
| IServiceLocator locator, Class targetType) { |
| ISelectionService selectionService = (ISelectionService) locator |
| .getService(ISelectionService.class); |
| Assert.isNotNull(selectionService); |
| return WorkbenchProperties.singleSelection(null, true).value( |
| WorkbenchProperties.adaptedValue(targetType)).observe( |
| selectionService); |
| } |
| } |