| /******************************************************************************* |
| * Copyright (c) 2003, 2018 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ui.internal; |
| |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Set; |
| import org.eclipse.jface.preference.IPreferenceStore; |
| import org.eclipse.jface.util.IPropertyChangeListener; |
| import org.eclipse.ui.PlatformUI; |
| import org.eclipse.ui.activities.ActivityManagerEvent; |
| import org.eclipse.ui.activities.IActivity; |
| import org.eclipse.ui.activities.IActivityManager; |
| import org.eclipse.ui.activities.IActivityManagerListener; |
| import org.eclipse.ui.activities.IActivityRequirementBinding; |
| import org.eclipse.ui.activities.IWorkbenchActivitySupport; |
| import org.eclipse.ui.activities.NotDefinedException; |
| |
| /** |
| * Utility class that manages the persistance of enabled activities. |
| * |
| * @since 3.0 |
| */ |
| final class ActivityPersistanceHelper { |
| |
| /** |
| * Prefix for all activity preferences |
| */ |
| protected static final String PREFIX = "UIActivities."; //$NON-NLS-1$ |
| |
| /** |
| * Singleton instance. |
| */ |
| private static ActivityPersistanceHelper singleton; |
| |
| /** |
| * The listener that responds to changes in the <code>IActivityManager</code> |
| */ |
| private final IActivityManagerListener activityManagerListener = (ActivityManagerEvent activityManagerEvent) -> { |
| // process newly defined activities. |
| if (activityManagerEvent.haveDefinedActivityIdsChanged()) { |
| Set<String> delta = new HashSet<>(activityManagerEvent.getActivityManager().getDefinedActivityIds()); |
| delta.removeAll(activityManagerEvent.getPreviouslyDefinedActivityIds()); |
| // whatever is still in delta are new activities - restore their |
| // state |
| loadEnabledStates(activityManagerEvent.getActivityManager().getEnabledActivityIds(), delta); |
| } |
| if (activityManagerEvent.haveEnabledActivityIdsChanged()) { |
| saveEnabledStates(); |
| } |
| }; |
| |
| /** |
| * The listener that responds to preference changes |
| */ |
| private final IPropertyChangeListener propertyChangeListener = event -> { |
| // dont process property events if we're in the process of |
| // serializing state. |
| if (!this.saving && event.getProperty().startsWith(PREFIX)) { |
| String activityId = event.getProperty().substring(PREFIX.length()); |
| IWorkbenchActivitySupport support = PlatformUI.getWorkbench().getActivitySupport(); |
| IActivityManager activityManager = support.getActivityManager(); |
| |
| boolean enabled = Boolean.parseBoolean(event.getNewValue().toString()); |
| // if we're turning an activity off we'll need to create its dependency tree to |
| // ensuure that all dependencies are also disabled. |
| Set<String> set = new HashSet<>(activityManager.getEnabledActivityIds()); |
| if (enabled == false) { |
| Set<String> dependencies = buildDependencies(activityManager, activityId); |
| set.removeAll(dependencies); |
| } else { |
| set.add(activityId); |
| } |
| support.setEnabledActivityIds(set); |
| } |
| }; |
| |
| /** |
| * Whether we are currently saving the state of activities to the preference |
| * store. |
| */ |
| protected boolean saving = false; |
| |
| /** |
| * Get the singleton instance of this class. |
| * |
| * @return the singleton instance of this class. |
| */ |
| public static ActivityPersistanceHelper getInstance() { |
| if (singleton == null) { |
| singleton = new ActivityPersistanceHelper(); |
| } |
| return singleton; |
| } |
| |
| /** |
| * Returns a set of activity IDs that depend on the provided ID in order to be |
| * enabled. |
| * |
| * @param activityManager the activity manager to query |
| * @param activityId the activity whos dependencies should be added |
| * @return a set of activity IDs |
| */ |
| protected Set<String> buildDependencies(IActivityManager activityManager, String activityId) { |
| Set<String> set = new HashSet<>(); |
| for (String id : activityManager.getDefinedActivityIds()) { |
| IActivity activity = activityManager.getActivity(id); |
| for (IActivityRequirementBinding binding : activity.getActivityRequirementBindings()) { |
| if (activityId.equals(binding.getRequiredActivityId())) { |
| set.addAll(buildDependencies(activityManager, activity.getId())); |
| } |
| } |
| } |
| set.add(activityId); |
| return set; |
| } |
| |
| /** |
| * Create a new <code>ActivityPersistanceHelper</code> which will restore |
| * previously enabled activity states. |
| */ |
| private ActivityPersistanceHelper() { |
| loadEnabledStates(); |
| hookListeners(); |
| } |
| |
| /** |
| * Hook the listener that will respond to any activity state changes. |
| */ |
| private void hookListeners() { |
| IWorkbenchActivitySupport support = PlatformUI.getWorkbench().getActivitySupport(); |
| |
| IActivityManager activityManager = support.getActivityManager(); |
| |
| activityManager.addActivityManagerListener(activityManagerListener); |
| |
| IPreferenceStore store = WorkbenchPlugin.getDefault().getPreferenceStore(); |
| |
| store.addPropertyChangeListener(propertyChangeListener); |
| } |
| |
| /** |
| * Hook the listener that will respond to any activity state changes. |
| */ |
| private void unhookListeners() { |
| IWorkbenchActivitySupport support = PlatformUI.getWorkbench().getActivitySupport(); |
| |
| IActivityManager activityManager = support.getActivityManager(); |
| |
| activityManager.removeActivityManagerListener(activityManagerListener); |
| |
| IPreferenceStore store = WorkbenchPlugin.getDefault().getPreferenceStore(); |
| |
| store.removePropertyChangeListener(propertyChangeListener); |
| } |
| |
| /** |
| * Create the preference key for the activity. |
| * |
| * @param activityId the activity id. |
| * @return String a preference key representing the activity. |
| */ |
| private String createPreferenceKey(String activityId) { |
| return PREFIX + activityId; |
| } |
| |
| /** |
| * Loads the enabled states from the preference store. |
| */ |
| void loadEnabledStates() { |
| loadEnabledStates(Collections.EMPTY_SET, |
| PlatformUI.getWorkbench().getActivitySupport().getActivityManager().getDefinedActivityIds()); |
| } |
| |
| /** |
| * Load the enabled states for the given activity IDs. |
| * |
| * @param previouslyEnabledActivities the activity states to maintain. This set |
| * must be writabe. |
| * @param activityIdsToProcess the activity ids to process |
| */ |
| protected void loadEnabledStates(Set<String> previouslyEnabledActivities, Set<String> activityIdsToProcess) { |
| if (activityIdsToProcess.isEmpty()) { |
| return; |
| } |
| |
| Set<String> enabledActivities = new HashSet<>(previouslyEnabledActivities); |
| IPreferenceStore store = WorkbenchPlugin.getDefault().getPreferenceStore(); |
| |
| IWorkbenchActivitySupport support = PlatformUI.getWorkbench().getActivitySupport(); |
| |
| IActivityManager activityManager = support.getActivityManager(); |
| |
| for (String activityId : activityIdsToProcess) { |
| String preferenceKey = createPreferenceKey(activityId); |
| try { |
| IActivity activity = activityManager.getActivity(activityId); |
| if (activity.getExpression() != null) { |
| continue; |
| } |
| if ("".equals(store.getDefaultString(preferenceKey))) { //$NON-NLS-1$ // no override has been provided |
| // in the customization file |
| store // the default should be whatever the XML specifies |
| .setDefault(preferenceKey, activity.isDefaultEnabled()); |
| |
| } |
| |
| } catch (NotDefinedException e) { |
| // can't happen - we're iterating over defined activities |
| } |
| |
| if (store.getBoolean(preferenceKey)) { |
| enabledActivities.add(activityId); |
| } else { |
| enabledActivities.remove(activityId); |
| } |
| } |
| |
| support.setEnabledActivityIds(enabledActivities); |
| } |
| |
| /** |
| * Save the enabled states in the preference store. |
| */ |
| protected void saveEnabledStates() { |
| try { |
| saving = true; |
| |
| IPreferenceStore store = WorkbenchPlugin.getDefault().getPreferenceStore(); |
| |
| IWorkbenchActivitySupport support = PlatformUI.getWorkbench().getActivitySupport(); |
| IActivityManager activityManager = support.getActivityManager(); |
| Iterator<String> values = activityManager.getDefinedActivityIds().iterator(); |
| while (values.hasNext()) { |
| IActivity activity = activityManager.getActivity(values.next()); |
| if (activity.getExpression() != null) { |
| continue; |
| } |
| |
| store.setValue(createPreferenceKey(activity.getId()), activity.isEnabled()); |
| } |
| WorkbenchPlugin.getDefault().savePluginPreferences(); |
| } finally { |
| saving = false; |
| } |
| } |
| |
| /** |
| * Save the enabled state of all activities. |
| */ |
| public void shutdown() { |
| unhookListeners(); |
| saveEnabledStates(); |
| } |
| } |