org.eclipse.ui.preferences.WorkingCopyManager#org.eclipse.core.runtime.preferences.IScopeContext源码实例Demo

private static void addSettings(IProject project, String workspaceRoot, List<String> targets,
    List<String> buildFlags) throws BackingStoreException {
  IScopeContext projectScope = new ProjectScope(project);
  Preferences projectNode = projectScope.getNode(Activator.PLUGIN_ID);
  int i = 0;
  for (String target : targets) {
    projectNode.put("target" + i, target);
    i++;
  }
  projectNode.put("workspaceRoot", workspaceRoot);
  i = 0;
  for (String flag : buildFlags) {
    projectNode.put("buildFlag" + i, flag);
    i++;
  }
  projectNode.flush();
}
 

/**
 * Switches the search scope of the preference store to use [Project, Instance, Configuration] if values are project
 * specific, and [Instance, Configuration] otherwise. This implementation requires that the given preference store
 * is based on the Project preference store when the page is used as a Properties page. (This is done in
 * {@link #doGetPreferenceStore()}).
 */
@SuppressWarnings("deprecation")
private void handleUseProjectSettings() {
	// Note: uses the pre Eclipse 3.6 way of specifying search scopes (deprecated since 3.6)
	boolean isUseProjectSettings = useProjectSettingsButton.getSelection();
	link.setEnabled(!isUseProjectSettings);
	if (!isUseProjectSettings) {
		((FixedScopedPreferenceStore) getPreferenceStore()).setSearchContexts(new IScopeContext[] {
				new InstanceScope(), new ConfigurationScope() });
	} else {
		((FixedScopedPreferenceStore) getPreferenceStore()).setSearchContexts(new IScopeContext[] {
				new ProjectScope(currentProject()), new InstanceScope(), new ConfigurationScope() });
		setProjectSpecificValues();
	}
	updateFieldEditors(isUseProjectSettings);
}
 

@Override
@SuppressWarnings("deprecation")
public IPreferenceStore getWritablePreferenceStore(Object context) {
	lazyInitialize();
	IProject project = getProject(context);
	if (project == null) {
		return getWritablePreferenceStore();
	}
	ProjectScope projectScope = new ProjectScope(project);
	FixedScopedPreferenceStore result = new FixedScopedPreferenceStore(projectScope, getQualifier());
	result.setSearchContexts(new IScopeContext[] {
		projectScope,
		new InstanceScope(),
		new ConfigurationScope()
	});
	return result;
}
 

public boolean hasProjectSpecificOptions(IProject project)
{
	if (project != null)
	{
		IScopeContext projectContext = new ProjectScope(project);
		PreferenceKey[] allKeys = fAllKeys;
		for (int i = 0; i < allKeys.length; i++)
		{
			if (allKeys[i].getStoredValue(projectContext, fManager) != null)
			{
				return true;
			}
		}
	}
	return false;
}
 

/**
 * Updates project related fields, and saves to the preferences.
 */
private void updateProjectRelated() {
    IScopeContext context = new ProjectScope(project);
    IEclipsePreferences preferences = context.getNode(CodeCheckerNature.NATURE_ID);

    for (ConfigTypes ctp : ConfigTypes.PROJECT_TYPE){
        String value = null;
        switch (ctp) {
            case CHECKER_WORKSPACE:
                value = codeCheckerWorkspace.toString();
                break;
            case IS_GLOBAL:
                value = Boolean.toString(isGlobal);
                break;
            default:
                break;
        }
        preferences.put(ctp.toString(), value);
    }
    try {
        preferences.flush();
    } catch (BackingStoreException e) {
        Logger.log(IStatus.ERROR, "Preferences cannot be saved!");
        e.printStackTrace();
    }
}
 

@SuppressWarnings("all")
@Override
public IPreferenceStore getContextPreferenceStore(Object context) {
	IProject project = getProject(context);
	if (project == null) return getPreferenceStore();
	IPreferenceStore store = super.getContextPreferenceStore(context);
	ProjectScope projectScope = new ProjectScope(project);
	FixedScopedPreferenceStore jdtStore = new FixedScopedPreferenceStore(projectScope, JavaCore.PLUGIN_ID);
	jdtStore.setSearchContexts(new IScopeContext[] {
			projectScope,
			new InstanceScope(),
			new ConfigurationScope()
	});
	return new ChainedPreferenceStore(new IPreferenceStore[] {
		store,
		jdtStore,
		PreferenceConstants.getPreferenceStore()
	});
}
 

public AbstractFormatterSelectionBlock(IStatusChangeListener context, IProject project,
		IWorkbenchPreferenceContainer container)
{
	super(context, project, ProfileManager.collectPreferenceKeys(TEMP_LIST, true), container);
	Collections.sort(TEMP_LIST, new Comparator<IScriptFormatterFactory>()
	{
		public int compare(IScriptFormatterFactory s1, IScriptFormatterFactory s2)
		{
			return s1.getName().compareToIgnoreCase(s2.getName());
		}
	});
	factories = TEMP_LIST.toArray(new IScriptFormatterFactory[TEMP_LIST.size()]);
	TEMP_LIST = new ArrayList<IScriptFormatterFactory>();
	sourcePreviewViewers = new ArrayList<SourceViewer>();

	// Override the super preferences lookup order.
	// All the changes to the formatter settings should go to the instance scope (no project scope here). Only the
	// selected profile will be picked from the project scope and then the instance scope when requested.
	fLookupOrder = new IScopeContext[] { EclipseUtil.instanceScope(), EclipseUtil.defaultScope() };
}
 

@Override
protected void updateProfilesWithName(String oldName, Profile newProfile, boolean applySettings) {
	IProject[] projects = ResourcesPlugin.getWorkspace().getRoot().getProjects();
	for (int i = 0; i < projects.length; i++) {
		IScopeContext projectScope = fPreferencesAccess.getProjectScope(projects[i]);
		IEclipsePreferences node = projectScope.getNode(getNodeId());
		String profileId = node.get(fProfileKey, null);
		if (oldName.equals(profileId)) {
			if (newProfile == null) {
				node.remove(fProfileKey);
			} else {
				if (applySettings) {
					writeToPreferenceStore(newProfile, projectScope);
				} else {
					node.put(fProfileKey, newProfile.getID());
				}
			}
		}
	}

	IScopeContext instanceScope = fPreferencesAccess.getInstanceScope();
	final IEclipsePreferences uiPrefs = instanceScope.getNode(getNodeId());
	if (newProfile != null && oldName.equals(uiPrefs.get(fProfileKey, null))) {
		writeToPreferenceStore(newProfile, instanceScope);
	}
}
 

private boolean getChanges(IScopeContext currContext, List<Key> changedSettings) {
	boolean needsBuild = false;
	for (int i = 0; i < fAllKeys.length; i++) {
		Key key = fAllKeys[i];
		String oldVal = key.getStoredValue(currContext, null);
		String val = key.getStoredValue(currContext, fManager);
		if (val == null) {
			if (oldVal != null) {
				changedSettings.add(key);
				needsBuild |= !oldVal.equals(key.getStoredValue(fLookupOrder, true, fManager));
			}
		} else if (!val.equals(oldVal)) {
			changedSettings.add(key);
			needsBuild |= oldVal != null || !val.equals(key.getStoredValue(fLookupOrder, true, fManager));
		}
	}
	return needsBuild;
}
 

public static TimeZone getTimeZone ()
{
    final IScopeContext[] scopeContext = new IScopeContext[] { ConfigurationScope.INSTANCE };
    final String tzId = Platform.getPreferencesService ().getString ( PLUGIN_ID, TIME_ZONE_KEY, TimeZone.getDefault ().getID (), scopeContext );
    if ( Arrays.asList ( TimeZone.getAvailableIDs () ).contains ( tzId ) )
    {
        return TimeZone.getTimeZone ( tzId );
    }
    return TimeZone.getDefault ();
}
 

/**
 * List targets configure for <code>project</code>. Each project configured for Bazel is
 * configured to track certain targets and this function fetch this list from the project
 * preferences.
 */
public static List<String> getTargets(IProject project) throws BackingStoreException {
  // Get the list of targets from the preferences
  IScopeContext projectScope = new ProjectScope(project);
  Preferences projectNode = projectScope.getNode(Activator.PLUGIN_ID);
  ImmutableList.Builder<String> builder = ImmutableList.builder();
  for (String s : projectNode.keys()) {
    if (s.startsWith("target")) {
      builder.add(projectNode.get(s, ""));
    }
  }
  return builder.build();
}
 

/**
 * List of build flags for <code>project</code>, taken from the project configuration
 */
public static List<String> getBuildFlags(IProject project) throws BackingStoreException {
  // Get the list of targets from the preferences
  IScopeContext projectScope = new ProjectScope(project);
  Preferences projectNode = projectScope.getNode(Activator.PLUGIN_ID);
  ImmutableList.Builder<String> builder = ImmutableList.builder();
  for (String s : projectNode.keys()) {
    if (s.startsWith("buildArgs")) {
      builder.add(projectNode.get(s, ""));
    }
  }
  return builder.build();
}
 

/**
 * Return the {@link BazelInstance} corresponding to the given <code>project</code>. It looks for
 * the instance that runs for the workspace root configured for that project.
 *
 * @throws BazelNotFoundException
 */
public static BazelCommand.BazelInstance getBazelCommandInstance(IProject project)
    throws BackingStoreException, IOException, InterruptedException, BazelNotFoundException {
  IScopeContext projectScope = new ProjectScope(project.getProject());
  Preferences projectNode = projectScope.getNode(Activator.PLUGIN_ID);
  File workspaceRoot =
      new File(projectNode.get("workspaceRoot", project.getLocation().toFile().toString()));
  return Activator.getDefault().getCommand().getInstance(workspaceRoot);
}
 

/**
 * Convert an Eclipse JDT project into an IntelliJ project view
 */
public static ProjectView getProjectView(IProject project)
    throws BackingStoreException, JavaModelException {
  com.google.devtools.bazel.e4b.projectviews.Builder builder = ProjectView.builder();
  IScopeContext projectScope = new ProjectScope(project);
  Preferences projectNode = projectScope.getNode(Activator.PLUGIN_ID);
  for (String s : projectNode.keys()) {
    if (s.startsWith("buildArgs")) {
      builder.addBuildFlag(projectNode.get(s, ""));
    } else if (s.startsWith("target")) {
      builder.addTarget(projectNode.get(s, ""));
    }
  }

  IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
  for (IClasspathEntry entry : ((IJavaProject) project).getRawClasspath()) {
    switch (entry.getEntryKind()) {
      case IClasspathEntry.CPE_SOURCE:
        IResource res = root.findMember(entry.getPath());
        if (res != null) {
          builder.addDirectory(res.getProjectRelativePath().removeFirstSegments(1).toOSString());
        }
        break;
      case IClasspathEntry.CPE_CONTAINER:
        String path = entry.getPath().toOSString();
        if (path.startsWith(STANDARD_VM_CONTAINER_PREFIX)) {
          builder.setJavaLanguageLevel(
              Integer.parseInt(path.substring(STANDARD_VM_CONTAINER_PREFIX.length())));
        }
        break;
    }
  }
  return builder.build();
}
 

/**
 * Resolve a path like <code>instance://org.example.bundle/path/to/boolean</code> to an
 * {@link IPreferenceStore}.
 * 
 * @param preferenceUri the preference path
 * @return the corresponding store
 * @throws IllegalArgumentException if unable to resolve the URI
 */
public static IPreferenceStore resolve(URI preferenceUri) throws IllegalArgumentException {
  IScopeContext context = resolveScopeContext(preferenceUri.getScheme());
  String path = preferenceUri.getHost();
  if (preferenceUri.getPath() != null) {
    path += preferenceUri.getPath();
  }
  return new ScopedPreferenceStore(context, path);
}
 

@Override
public int open()
{
	String saveDirty = Platform.getPreferencesService().getString(IDebugUIConstants.PLUGIN_ID,
			IInternalDebugUIConstants.PREF_SAVE_DIRTY_EDITORS_BEFORE_LAUNCH, StringUtil.EMPTY,
			new IScopeContext[] { EclipseUtil.instanceScope(), EclipseUtil.defaultScope() });
	if (saveDirty.equals(MessageDialogWithToggle.ALWAYS))
	{
		setResult(dirtyResources);
		return Window.OK;
	}
	return super.open();
}
 

@Override
@SuppressWarnings("deprecation")
public IPreferenceStore getWritablePreferenceStore() {
	lazyInitialize();
	FixedScopedPreferenceStore result = new FixedScopedPreferenceStore(new InstanceScope(), getQualifier());
	result.setSearchContexts(new IScopeContext[] {
		new InstanceScope(),
		new ConfigurationScope()
	});
	return result;
}
 

public PreferenceStoreWrapper providePreferenceStore() {
    IPreferenceStore[] preferenceStores = new IPreferenceStore[2];
    preferenceStores[0] = Activator.getDefault().getPreferenceStore();

    ScopedPreferenceStore jdtCorePreferenceStore = new ScopedPreferenceStore(InstanceScope.INSTANCE, "org.eclipse.jdt.core");
    if (currentJavaProject.isPresent()) { // if we are in a project add to search scope
        jdtCorePreferenceStore.setSearchContexts(new IScopeContext[] { new ProjectScope(currentJavaProject.get().getProject()), InstanceScope.INSTANCE });
    }
    preferenceStores[1] = jdtCorePreferenceStore;

    return new PreferenceStoreWrapper(new ChainedPreferenceStore(preferenceStores));
}
 

protected boolean isAutoBuildEnabled()
{
	IPreferencesService service = Platform.getPreferencesService();
	String qualifier = ResourcesPlugin.getPlugin().getBundle().getSymbolicName();
	String key = "description.autobuilding";
	IScopeContext[] contexts = { InstanceScope.INSTANCE, ConfigurationScope.INSTANCE };
	return service.getBoolean(qualifier, key, false, contexts);
}
 

protected boolean isAutoBuildEnabled()
{
	IPreferencesService service = Platform.getPreferencesService();
	String qualifier = ResourcesPlugin.getPlugin().getBundle().getSymbolicName();
	String key = "description.autobuilding";
	IScopeContext[] contexts = { InstanceScope.INSTANCE, ConfigurationScope.INSTANCE};
	return service.getBoolean( qualifier, key, false, contexts );
}
 

private IScopeContext[] getLookupScopes(IProject project)
{
	List<IScopeContext> list = new ArrayList<IScopeContext>(3);
	list.add(EclipseUtil.instanceScope());
	list.add(EclipseUtil.defaultScope());

	if (project != null)
	{
		list.add(0, new ProjectScope(project));
	}

	return list.toArray(new IScopeContext[list.size()]);
}
 

public String getStoredValue(IScopeContext[] lookupOrder, boolean ignoreTopScope, IWorkingCopyManager manager) {
	for (int i= ignoreTopScope ? 1 : 0; i < lookupOrder.length; i++) {
		String value= getStoredValue(lookupOrder[i], manager);
		if (value != null) {
			return value;
		}
	}
	return null;
}
 

public void setStoredValue(IScopeContext context, String value, IWorkingCopyManager manager) {
	if (value != null) {
		getNode(context, manager).put(fKey, value);
	} else {
		getNode(context, manager).remove(fKey);
	}
}
 

public void setStoredBoolean(IScopeContext context, Boolean value, IWorkingCopyManager manager) {
	if (value != null) {
		getNode(context, manager).putBoolean(fKey, value);
	} else {
		getNode(context, manager).remove(fKey);
	}
}
 

public void setStoredInt(IScopeContext context, Integer value, IWorkingCopyManager manager) {
    if (value != null) {
        getNode(context, manager).putInt(fKey, value);
    } else {
        getNode(context, manager).remove(fKey);
    }
}
 

public static void addChangeListener(IScopeContext context, IWorkingCopyManager manager, 
                                     String qualifier, IPreferenceChangeListener listener) 
{
    IEclipsePreferences node= context.getNode(qualifier);
    if (manager != null) {
        node =  manager.getWorkingCopy(node);
    }
    node.addPreferenceChangeListener(listener);
}
 

public static void removeChangeListener(IScopeContext context, IWorkingCopyManager manager, 
                                        String qualifier, IPreferenceChangeListener listener) 
{
    IEclipsePreferences node= context.getNode(qualifier);
    if (manager != null) {
        node =  manager.getWorkingCopy(node);
    }
    node.removePreferenceChangeListener(listener);
}
 

/**
 * Checks the common editor plugin to see if the user has enabled hovers on content assist
 * 
 * @return <code>true</code>, if hover is enabled; <code>false</code>, otherwise.
 */
public Boolean isHoverEnabled()
{
	IScopeContext[] scopes = new IScopeContext[] { EclipseUtil.instanceScope(), EclipseUtil.defaultScope() };
	return Platform.getPreferencesService().getBoolean(CommonEditorPlugin.PLUGIN_ID,
			IPreferenceConstants.CONTENT_ASSIST_HOVER, true, scopes);
}
 

/**
 * TODO : implement better architecture for storing preferences.
 * 
 * @param scope
 * @param qualifier
 * @see org.osgi.service.prefs.Preferences#flush
 */
public static void flush(IScopeContext scope, String qualifier) {
	try {
           IEclipsePreferences node = scope.getNode(qualifier);
           node.flush();
       } catch (BackingStoreException e) {
           LogHelper.logError(e);
       }
}
 

public static String ofWorkspace() {
	IPreferencesService prefs = Platform.getPreferencesService();
	IScopeContext[] scopeContext = new IScopeContext[] { InstanceScope.INSTANCE };
	String lineSeparator = prefs.getString(Platform.PI_RUNTIME, Platform.PREF_LINE_SEPARATOR, null, scopeContext);
	if (lineSeparator == null) {
		lineSeparator = System.getProperty("line.separator");
	}
	return toLabel(lineSeparator);
}