net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/ui/actions/CustomFiltersActionGroup.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.ui.actions;
  12
  13 import java.util.ArrayList;
  14 import java.util.Arrays;
  15 import java.util.HashMap;
  16 import java.util.HashSet;
  17 import java.util.Iterator;
  18 import java.util.List;
  19 import java.util.Map;
  20 import java.util.Set;
  21 import java.util.SortedSet;
  22 import java.util.Stack;
  23 import java.util.StringTokenizer;
  24 import java.util.TreeSet;
  25
  26 //import net.sourceforge.phpdt.core.IJavaModel;
  27 import net.sourceforge.phpdt.internal.ui.PHPUiImages;
  28 import net.sourceforge.phpdt.internal.ui.filters.CustomFiltersDialog;
  29 import net.sourceforge.phpdt.internal.ui.filters.FilterDescriptor;
  30 import net.sourceforge.phpdt.internal.ui.filters.FilterMessages;
  31 import net.sourceforge.phpdt.internal.ui.filters.NamePatternFilter;
  32 //import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  33 import net.sourceforge.phpeclipse.ui.WebUI;
  34
  35 import org.eclipse.jface.action.Action;
  36 import org.eclipse.jface.action.ContributionItem;
  37 import org.eclipse.jface.action.GroupMarker;
  38 import org.eclipse.jface.action.IContributionItem;
  39 import org.eclipse.jface.action.IMenuListener;
  40 import org.eclipse.jface.action.IMenuManager;
  41 import org.eclipse.jface.action.IToolBarManager;
  42 import org.eclipse.jface.action.Separator;
  43 import org.eclipse.jface.preference.IPreferenceStore;
  44 //incastrix
  45 //import org.eclipse.jface.text.Assert;
  46 import org.eclipse.core.runtime.Assert;
  47 //import org.eclipse.jface.viewers.IContentProvider;
  48 //import org.eclipse.jface.viewers.ITreeContentProvider;
  49 import org.eclipse.jface.viewers.StructuredViewer;
  50 import org.eclipse.jface.viewers.ViewerFilter;
  51 import org.eclipse.jface.window.Window;
  52 import org.eclipse.swt.SWT;
  53 import org.eclipse.swt.events.SelectionAdapter;
  54 import org.eclipse.swt.events.SelectionEvent;
  55 import org.eclipse.swt.widgets.Menu;
  56 import org.eclipse.swt.widgets.MenuItem;
  57 import org.eclipse.ui.IActionBars;
  58 import org.eclipse.ui.IMemento;
  59 //import org.eclipse.ui.IViewPart;
  60 import org.eclipse.ui.actions.ActionGroup;
  61
  62 /**
  63  * Action group to add the filter action to a view part's tool bar menu.
  64  * <p>
  65  * This class may be instantiated; it is not intended to be subclassed.
  66  * </p>
  67  *
  68  * @since 2.0
  69  */
  70 public class CustomFiltersActionGroup extends ActionGroup {
  71
  72         class ShowFilterDialogAction extends Action {
  73                 ShowFilterDialogAction() {
  74                         setText(FilterMessages
  75                                         .getString("OpenCustomFiltersDialogAction.text")); //$NON-NLS-1$
  76                         setImageDescriptor(PHPUiImages.DESC_ELCL_FILTER);
  77                         setDisabledImageDescriptor(PHPUiImages.DESC_DLCL_FILTER);
  78                 }
  79
  80                 public void run() {
  81                         openDialog();
  82                 }
  83         }
  84
  85         /**
  86          * Menu contribution item which shows and lets check and uncheck filters.
  87          *
  88          * @since 3.0
  89          */
  90         class FilterActionMenuContributionItem extends ContributionItem {
  91
  92                 private int fItemNumber;
  93
  94                 private boolean fState;
  95
  96                 private String fFilterId;
  97
  98                 private String fFilterName;
  99
 100                 private CustomFiltersActionGroup fActionGroup;
 101
 102                 /**
 103                  * Constructor for FilterActionMenuContributionItem.
 104                  *
 105                  * @param actionGroup
 106                  *            the action group
 107                  * @param filterId
 108                  *            the id of the filter
 109                  * @param filterName
 110                  *            the name of the filter
 111                  * @param state
 112                  *            the initial state of the filter
 113                  * @param itemNumber
 114                  *            the menu item index
 115                  */
 116                 public FilterActionMenuContributionItem(
 117                                 CustomFiltersActionGroup actionGroup, String filterId,
 118                                 String filterName, boolean state, int itemNumber) {
 119                         super(filterId);
 120                         Assert.isNotNull(actionGroup);
 121                         Assert.isNotNull(filterId);
 122                         Assert.isNotNull(filterName);
 123                         fActionGroup = actionGroup;
 124                         fFilterId = filterId;
 125                         fFilterName = filterName;
 126                         fState = state;
 127                         fItemNumber = itemNumber;
 128                 }
 129
 130                 /*
 131                  * Overrides method from ContributionItem.
 132                  */
 133                 public void fill(Menu menu, int index) {
 134                         MenuItem mi = new MenuItem(menu, SWT.CHECK, index);
 135                         mi.setText("&" + fItemNumber + " " + fFilterName); //$NON-NLS-1$  //$NON-NLS-2$
 136                         /*
 137                          * XXX: Don't set the image - would look bad because other menu
 138                          * items don't provide image XXX: Get working set specific image
 139                          * name from XML - would need to cache icons
 140                          */
 141                         // mi.setImage(JavaPluginImages.get(JavaPluginImages.IMG_OBJS_JAVA_WORKING_SET));
 142                         mi.setSelection(fState);
 143                         mi.addSelectionListener(new SelectionAdapter() {
 144                                 public void widgetSelected(SelectionEvent e) {
 145                                         fState = !fState;
 146                                         fActionGroup.setFilter(fFilterId, fState);
 147                                 }
 148                         });
 149                 }
 150
 151                 /*
 152                  * @see org.eclipse.jface.action.IContributionItem#isDynamic()
 153                  */
 154                 public boolean isDynamic() {
 155                         return true;
 156                 }
 157         }
 158
 159         private static final String TAG_CUSTOM_FILTERS = "customFilters"; //$NON-NLS-1$
 160
 161         private static final String TAG_USER_DEFINED_PATTERNS_ENABLED = "userDefinedPatternsEnabled"; //$NON-NLS-1$
 162
 163         private static final String TAG_USER_DEFINED_PATTERNS = "userDefinedPatterns"; //$NON-NLS-1$
 164
 165         private static final String TAG_XML_DEFINED_FILTERS = "xmlDefinedFilters"; //$NON-NLS-1$
 166
 167         private static final String TAG_LRU_FILTERS = "lastRecentlyUsedFilters"; //$NON-NLS-1$
 168
 169         private static final String TAG_CHILD = "child"; //$NON-NLS-1$
 170
 171         private static final String TAG_PATTERN = "pattern"; //$NON-NLS-1$
 172
 173         private static final String TAG_FILTER_ID = "filterId"; //$NON-NLS-1$
 174
 175         private static final String TAG_IS_ENABLED = "isEnabled"; //$NON-NLS-1$
 176
 177         private static final String SEPARATOR = ","; //$NON-NLS-1$
 178
 179         private static final int MAX_FILTER_MENU_ENTRIES = 3;
 180
 181         private static final String RECENT_FILTERS_GROUP_NAME = "recentFiltersGroup"; //$NON-NLS-1$
 182
 183         private StructuredViewer fViewer;
 184
 185         private NamePatternFilter fPatternFilter;
 186
 187         private Map fInstalledBuiltInFilters;
 188
 189         private Map fEnabledFilterIds;
 190
 191         private boolean fUserDefinedPatternsEnabled;
 192
 193         private String[] fUserDefinedPatterns;
 194
 195         /**
 196          * Recently changed filter Ids stack with oldest on top (i.e. at the end).
 197          *
 198          * @since 3.0
 199          */
 200         private Stack fLRUFilterIdsStack;
 201
 202         /**
 203          * Handle to menu manager to dynamically update the last recently used
 204          * filters.
 205          *
 206          * @since 3.0
 207          */
 208         private IMenuManager fMenuManager;
 209
 210         /**
 211          * The menu listener which dynamically updates the last recently used
 212          * filters.
 213          *
 214          * @since 3.0
 215          */
 216         private IMenuListener fMenuListener;
 217
 218         /**
 219          * Filter Ids used in the last view menu invocation.
 220          *
 221          * @since 3.0
 222          */
 223         private String[] fFilterIdsUsedInLastViewMenu;
 224
 225         private HashMap fFilterDescriptorMap;
 226
 227         private String fTargetId;
 228
 229         /**
 230          * Creates a new <code>CustomFiltersActionGroup</code>.
 231          *
 232          * @param part
 233          *            the view part that owns this action group
 234          * @param viewer
 235          *            the viewer to be filtered
 236          */
 237 //      public CustomFiltersActionGroup(IViewPart part, StructuredViewer viewer) {
 238 //              this(part.getViewSite().getId(), viewer);
 239 //      }
 240
 241         /**
 242          * Creates a new <code>CustomFiltersActionGroup</code>.
 243          *
 244          * @param ownerId
 245          *            the id of this action group's owner
 246          * @param viewer
 247          *            the viewer to be filtered
 248          */
 249         public CustomFiltersActionGroup(String ownerId, StructuredViewer viewer) {
 250                 Assert.isNotNull(ownerId);
 251                 Assert.isNotNull(viewer);
 252                 fTargetId = ownerId;
 253                 fViewer = viewer;
 254
 255                 fLRUFilterIdsStack = new Stack();
 256
 257                 initializeWithPluginContributions();
 258                 initializeWithViewDefaults();
 259
 260                 installFilters();
 261         }
 262
 263         /*
 264          * Method declared on ActionGroup.
 265          */
 266         public void fillActionBars(IActionBars actionBars) {
 267                 fillToolBar(actionBars.getToolBarManager());
 268                 fillViewMenu(actionBars.getMenuManager());
 269         }
 270
 271 //      public String[] removeFiltersFor(Object parent, Object element,
 272 //                      IContentProvider contentProvider) {
 273 //              String[] enabledFilters = getEnabledFilterIds();
 274 //              Set newFilters = new HashSet();
 275 //              for (int i = 0; i < enabledFilters.length; i++) {
 276 //                      String filterName = enabledFilters[i];
 277 //                      ViewerFilter filter = (ViewerFilter) fInstalledBuiltInFilters
 278 //                                      .get(filterName);
 279 //                      if (filter == null)
 280 //                              newFilters.add(filterName);
 281 //                      else if (isSelected(parent, element, contentProvider, filter))
 282 //                              newFilters.add(filterName);
 283 //              }
 284 //              if (newFilters.size() == enabledFilters.length)
 285 //                      return new String[0];
 286 //              return (String[]) newFilters.toArray(new String[newFilters.size()]);
 287 //      }
 288
 289         public void setFilters(String[] newFilters) {
 290                 setEnabledFilterIds(newFilters);
 291                 updateViewerFilters(true);
 292         }
 293
 294 //      private boolean isSelected(Object parent, Object element,
 295 //                      IContentProvider contentProvider, ViewerFilter filter) {
 296 //              if (contentProvider instanceof ITreeContentProvider) {
 297 //                      // the element and all its parents have to be selected
 298 //                      ITreeContentProvider provider = (ITreeContentProvider) contentProvider;
 299 //                      while (element != null && !(element instanceof IJavaModel)) {
 300 //                              if (!filter.select(fViewer, parent, element))
 301 //                                      return false;
 302 //                              element = provider.getParent(element);
 303 //                      }
 304 //                      return true;
 305 //              }
 306 //              return filter.select(fViewer, parent, element);
 307 //      }
 308
 309         /**
 310          * Sets the enable state of the given filter.
 311          *
 312          * @param filterId
 313          *            the id of the filter
 314          * @param state
 315          *            the filter state
 316          */
 317         private void setFilter(String filterId, boolean state) {
 318                 // Renew filter id in LRU stack
 319                 fLRUFilterIdsStack.remove(filterId);
 320                 fLRUFilterIdsStack.add(0, filterId);
 321
 322                 fEnabledFilterIds.put(filterId, new Boolean(state));
 323                 storeViewDefaults();
 324
 325                 updateViewerFilters(true);
 326         }
 327
 328         private String[] getEnabledFilterIds() {
 329                 Set enabledFilterIds = new HashSet(fEnabledFilterIds.size());
 330                 Iterator iter = fEnabledFilterIds.entrySet().iterator();
 331                 while (iter.hasNext()) {
 332                         Map.Entry entry = (Map.Entry) iter.next();
 333                         String id = (String) entry.getKey();
 334                         boolean isEnabled = ((Boolean) entry.getValue()).booleanValue();
 335                         if (isEnabled)
 336                                 enabledFilterIds.add(id);
 337                 }
 338                 return (String[]) enabledFilterIds.toArray(new String[enabledFilterIds
 339                                 .size()]);
 340         }
 341
 342         private void setEnabledFilterIds(String[] enabledIds) {
 343                 Iterator iter = fEnabledFilterIds.keySet().iterator();
 344                 while (iter.hasNext()) {
 345                         String id = (String) iter.next();
 346                         fEnabledFilterIds.put(id, Boolean.FALSE);
 347                 }
 348                 for (int i = 0; i < enabledIds.length; i++)
 349                         fEnabledFilterIds.put(enabledIds[i], Boolean.TRUE);
 350         }
 351
 352         private void setUserDefinedPatterns(String[] patterns) {
 353                 fUserDefinedPatterns = patterns;
 354                 cleanUpPatternDuplicates();
 355         }
 356
 357         /**
 358          * Sets the recently changed filters.
 359          *
 360          * @param changeHistory
 361          *            the change history
 362          * @since 3.0
 363          */
 364         private void setRecentlyChangedFilters(Stack changeHistory) {
 365                 Stack oldestFirstStack = new Stack();
 366
 367                 int length = Math.min(changeHistory.size(), MAX_FILTER_MENU_ENTRIES);
 368                 for (int i = 0; i < length; i++)
 369                         oldestFirstStack.push(((FilterDescriptor) changeHistory.pop())
 370                                         .getId());
 371
 372                 length = Math.min(fLRUFilterIdsStack.size(), MAX_FILTER_MENU_ENTRIES
 373                                 - oldestFirstStack.size());
 374                 int NEWEST = 0;
 375                 for (int i = 0; i < length; i++) {
 376                         Object filter = fLRUFilterIdsStack.remove(NEWEST);
 377                         if (!oldestFirstStack.contains(filter))
 378                                 oldestFirstStack.push(filter);
 379                 }
 380                 fLRUFilterIdsStack = oldestFirstStack;
 381         }
 382
 383         private boolean areUserDefinedPatternsEnabled() {
 384                 return fUserDefinedPatternsEnabled;
 385         }
 386
 387         private void setUserDefinedPatternsEnabled(boolean state) {
 388                 fUserDefinedPatternsEnabled = state;
 389         }
 390
 391         private void fillToolBar(IToolBarManager tooBar) {
 392         }
 393
 394         /**
 395          * Fills the given view menu with the entries managed by the group.
 396          *
 397          * @param viewMenu
 398          *            the menu to fill
 399          */
 400         public void fillViewMenu(IMenuManager viewMenu) {
 401                 /*
 402                  * Don't change the separator group name. Using this name ensures that
 403                  * other filters get contributed to the same group.
 404                  */
 405                 viewMenu.add(new Separator("filters")); //$NON-NLS-1$
 406                 viewMenu.add(new GroupMarker(RECENT_FILTERS_GROUP_NAME));
 407                 viewMenu.add(new ShowFilterDialogAction());
 408
 409                 fMenuManager = viewMenu;
 410                 fMenuListener = new IMenuListener() {
 411                         public void menuAboutToShow(IMenuManager manager) {
 412                                 removePreviousLRUFilterActions(manager);
 413                                 addLRUFilterActions(manager);
 414                         }
 415                 };
 416                 fMenuManager.addMenuListener(fMenuListener);
 417         }
 418
 419         private void removePreviousLRUFilterActions(IMenuManager mm) {
 420                 if (fFilterIdsUsedInLastViewMenu == null)
 421                         return;
 422
 423                 for (int i = 0; i < fFilterIdsUsedInLastViewMenu.length; i++)
 424                         mm.remove(fFilterIdsUsedInLastViewMenu[i]);
 425         }
 426
 427         private void addLRUFilterActions(IMenuManager mm) {
 428                 if (fLRUFilterIdsStack.isEmpty()) {
 429                         fFilterIdsUsedInLastViewMenu = null;
 430                         return;
 431                 }
 432
 433                 SortedSet sortedFilters = new TreeSet(fLRUFilterIdsStack);
 434                 String[] recentlyChangedFilterIds = (String[]) sortedFilters
 435                                 .toArray(new String[sortedFilters.size()]);
 436
 437                 fFilterIdsUsedInLastViewMenu = new String[recentlyChangedFilterIds.length];
 438                 for (int i = 0; i < recentlyChangedFilterIds.length; i++) {
 439                         String id = recentlyChangedFilterIds[i];
 440                         fFilterIdsUsedInLastViewMenu[i] = id;
 441                         boolean state = fEnabledFilterIds.containsKey(id)
 442                                         && ((Boolean) fEnabledFilterIds.get(id)).booleanValue();
 443                         FilterDescriptor filterDesc = (FilterDescriptor) fFilterDescriptorMap
 444                                         .get(id);
 445                         if (filterDesc != null) {
 446                                 IContributionItem item = new FilterActionMenuContributionItem(
 447                                                 this, id, filterDesc.getName(), state, i + 1);
 448                                 mm.insertBefore(RECENT_FILTERS_GROUP_NAME, item);
 449                         }
 450                 }
 451         }
 452
 453         /*
 454          * Method declared on ActionGroup.
 455          */
 456         public void dispose() {
 457                 if (fMenuManager != null)
 458                         fMenuManager.removeMenuListener(fMenuListener);
 459                 super.dispose();
 460         }
 461
 462         private void initializeWithPluginContributions() {
 463                 fUserDefinedPatterns = new String[0];
 464                 fUserDefinedPatternsEnabled = false;
 465
 466                 FilterDescriptor[] filterDescs = FilterDescriptor
 467                                 .getFilterDescriptors(fTargetId);
 468                 fFilterDescriptorMap = new HashMap(filterDescs.length);
 469                 fEnabledFilterIds = new HashMap(filterDescs.length);
 470                 for (int i = 0; i < filterDescs.length; i++) {
 471                         String id = filterDescs[i].getId();
 472                         Boolean isEnabled = new Boolean(filterDescs[i].isEnabled());
 473                         if (fEnabledFilterIds.containsKey(id))
 474                                 WebUI
 475                                                 .logErrorMessage("WARNING: Duplicate id for extension-point \"net.sourceforge.phpdt.ui.javaElementFilters\""); //$NON-NLS-1$
 476                         fEnabledFilterIds.put(id, isEnabled);
 477                         fFilterDescriptorMap.put(id, filterDescs[i]);
 478                 }
 479         }
 480
 481         // ---------- viewer filter handling ----------
 482
 483         private void installFilters() {
 484                 fInstalledBuiltInFilters = new HashMap(fEnabledFilterIds.size());
 485                 fPatternFilter = new NamePatternFilter();
 486                 fPatternFilter.setPatterns(getUserAndBuiltInPatterns());
 487                 fViewer.addFilter(fPatternFilter);
 488                 updateBuiltInFilters();
 489         }
 490
 491         private void updateViewerFilters(boolean refresh) {
 492                 String[] patterns = getUserAndBuiltInPatterns();
 493                 fPatternFilter.setPatterns(patterns);
 494                 fViewer.getControl().setRedraw(false);
 495                 updateBuiltInFilters();
 496                 if (refresh)
 497                         fViewer.refresh();
 498                 fViewer.getControl().setRedraw(true);
 499         }
 500
 501         private void updateBuiltInFilters() {
 502                 Set installedFilters = fInstalledBuiltInFilters.keySet();
 503                 Set filtersToAdd = new HashSet(fEnabledFilterIds.size());
 504                 Set filtersToRemove = new HashSet(fEnabledFilterIds.size());
 505                 Iterator iter = fEnabledFilterIds.entrySet().iterator();
 506                 while (iter.hasNext()) {
 507                         Map.Entry entry = (Map.Entry) iter.next();
 508                         String id = (String) entry.getKey();
 509                         boolean isEnabled = ((Boolean) entry.getValue()).booleanValue();
 510                         if (isEnabled && !installedFilters.contains(id))
 511                                 filtersToAdd.add(id);
 512                         else if (!isEnabled && installedFilters.contains(id))
 513                                 filtersToRemove.add(id);
 514                 }
 515
 516                 // Install the filters
 517                 FilterDescriptor[] filterDescs = FilterDescriptor
 518                                 .getFilterDescriptors(fTargetId);
 519                 for (int i = 0; i < filterDescs.length; i++) {
 520                         String id = filterDescs[i].getId();
 521                         // just to double check - id should denote a custom filter anyway
 522                         boolean isCustomFilter = filterDescs[i].isCustomFilter();
 523                         if (isCustomFilter) {
 524                                 if (filtersToAdd.contains(id)) {
 525                                         ViewerFilter filter = filterDescs[i].createViewerFilter();
 526                                         if (filter != null) {
 527                                                 fViewer.addFilter(filter);
 528                                                 fInstalledBuiltInFilters.put(id, filter);
 529                                         }
 530                                 }
 531                                 if (filtersToRemove.contains(id)) {
 532                                         fViewer
 533                                                         .removeFilter((ViewerFilter) fInstalledBuiltInFilters
 534                                                                         .get(id));
 535                                         fInstalledBuiltInFilters.remove(id);
 536                                 }
 537                         }
 538                 }
 539         }
 540
 541         private String[] getUserAndBuiltInPatterns() {
 542                 List patterns = new ArrayList(fUserDefinedPatterns.length);
 543                 if (areUserDefinedPatternsEnabled())
 544                         patterns.addAll(Arrays.asList(fUserDefinedPatterns));
 545                 FilterDescriptor[] filterDescs = FilterDescriptor
 546                                 .getFilterDescriptors(fTargetId);
 547                 for (int i = 0; i < filterDescs.length; i++) {
 548                         String id = filterDescs[i].getId();
 549                         boolean isPatternFilter = filterDescs[i].isPatternFilter();
 550                         Object isEnabled = fEnabledFilterIds.get(id);
 551                         if (isEnabled != null && isPatternFilter
 552                                         && ((Boolean) isEnabled).booleanValue())
 553                                 patterns.add(filterDescs[i].getPattern());
 554                 }
 555                 return (String[]) patterns.toArray(new String[patterns.size()]);
 556         }
 557
 558         // ---------- view kind/defaults persistency ----------
 559
 560         private void initializeWithViewDefaults() {
 561                 // get default values for view
 562                 IPreferenceStore store = WebUI.getDefault()
 563                                 .getPreferenceStore();
 564
 565                 // XXX: can be removed once bug 22533 is fixed.
 566                 if (!store.contains(getPreferenceKey("TAG_DUMMY_TO_TEST_EXISTENCE")))//$NON-NLS-1$
 567                         return;
 568
 569                 // XXX: Uncomment once bug 22533 is fixed.
 570                 // if
 571                 // (!store.contains(getPreferenceKey(TAG_USER_DEFINED_PATTERNS_ENABLED)))
 572                 // return;
 573
 574                 fUserDefinedPatternsEnabled = store
 575                                 .getBoolean(getPreferenceKey(TAG_USER_DEFINED_PATTERNS_ENABLED));
 576                 setUserDefinedPatterns(CustomFiltersDialog.convertFromString(store
 577                                 .getString(getPreferenceKey(TAG_USER_DEFINED_PATTERNS)),
 578                                 SEPARATOR));
 579
 580                 Iterator iter = fEnabledFilterIds.keySet().iterator();
 581                 while (iter.hasNext()) {
 582                         String id = (String) iter.next();
 583                         Boolean isEnabled = new Boolean(store.getBoolean(id));
 584                         fEnabledFilterIds.put(id, isEnabled);
 585                 }
 586
 587                 fLRUFilterIdsStack.clear();
 588                 String lruFilterIds = store.getString(TAG_LRU_FILTERS);
 589                 StringTokenizer tokenizer = new StringTokenizer(lruFilterIds, SEPARATOR);
 590                 while (tokenizer.hasMoreTokens()) {
 591                         String id = tokenizer.nextToken();
 592                         if (fFilterDescriptorMap.containsKey(id)
 593                                         && !fLRUFilterIdsStack.contains(id))
 594                                 fLRUFilterIdsStack.push(id);
 595                 }
 596         }
 597
 598         private void storeViewDefaults() {
 599                 // get default values for view
 600                 IPreferenceStore store = WebUI.getDefault()
 601                                 .getPreferenceStore();
 602
 603                 // XXX: can be removed once bug 22533 is fixed.
 604                 store
 605                                 .setValue(
 606                                                 getPreferenceKey("TAG_DUMMY_TO_TEST_EXISTENCE"), "storedViewPreferences");//$NON-NLS-1$//$NON-NLS-2$
 607
 608                 store.setValue(getPreferenceKey(TAG_USER_DEFINED_PATTERNS_ENABLED),
 609                                 fUserDefinedPatternsEnabled);
 610                 store.setValue(getPreferenceKey(TAG_USER_DEFINED_PATTERNS),
 611                                 CustomFiltersDialog.convertToString(fUserDefinedPatterns,
 612                                                 SEPARATOR));
 613
 614                 Iterator iter = fEnabledFilterIds.entrySet().iterator();
 615                 while (iter.hasNext()) {
 616                         Map.Entry entry = (Map.Entry) iter.next();
 617                         String id = (String) entry.getKey();
 618                         boolean isEnabled = ((Boolean) entry.getValue()).booleanValue();
 619                         store.setValue(id, isEnabled);
 620                 }
 621
 622                 StringBuffer buf = new StringBuffer(fLRUFilterIdsStack.size() * 20);
 623                 iter = fLRUFilterIdsStack.iterator();
 624                 while (iter.hasNext()) {
 625                         buf.append((String) iter.next());
 626                         buf.append(SEPARATOR);
 627                 }
 628                 store.setValue(TAG_LRU_FILTERS, buf.toString());
 629         }
 630
 631         private String getPreferenceKey(String tag) {
 632                 return "CustomFiltersActionGroup." + fTargetId + '.' + tag; //$NON-NLS-1$
 633         }
 634
 635         // ---------- view instance persistency ----------
 636
 637         /**
 638          * Saves the state of the custom filters in a memento.
 639          *
 640          * @param memento
 641          *            the memento into which the state is saved
 642          */
 643         public void saveState(IMemento memento) {
 644                 IMemento customFilters = memento.createChild(TAG_CUSTOM_FILTERS);
 645                 customFilters.putString(TAG_USER_DEFINED_PATTERNS_ENABLED, new Boolean(
 646                                 fUserDefinedPatternsEnabled).toString());
 647                 saveUserDefinedPatterns(customFilters);
 648                 saveXmlDefinedFilters(customFilters);
 649                 saveLRUFilters(customFilters);
 650         }
 651
 652         private void saveXmlDefinedFilters(IMemento memento) {
 653                 if (fEnabledFilterIds != null && !fEnabledFilterIds.isEmpty()) {
 654                         IMemento xmlDefinedFilters = memento
 655                                         .createChild(TAG_XML_DEFINED_FILTERS);
 656                         Iterator iter = fEnabledFilterIds.entrySet().iterator();
 657                         while (iter.hasNext()) {
 658                                 Map.Entry entry = (Map.Entry) iter.next();
 659                                 String id = (String) entry.getKey();
 660                                 Boolean isEnabled = (Boolean) entry.getValue();
 661                                 IMemento child = xmlDefinedFilters.createChild(TAG_CHILD);
 662                                 child.putString(TAG_FILTER_ID, id);
 663                                 child.putString(TAG_IS_ENABLED, isEnabled.toString());
 664                         }
 665                 }
 666         }
 667
 668         /**
 669          * Stores the last recently used filter Ids into the given memento
 670          *
 671          * @param memento
 672          *            the memento into which to store the LRU filter Ids
 673          * @since 3.0
 674          */
 675         private void saveLRUFilters(IMemento memento) {
 676                 if (fLRUFilterIdsStack != null && !fLRUFilterIdsStack.isEmpty()) {
 677                         IMemento lruFilters = memento.createChild(TAG_LRU_FILTERS);
 678                         Iterator iter = fLRUFilterIdsStack.iterator();
 679                         while (iter.hasNext()) {
 680                                 String id = (String) iter.next();
 681                                 IMemento child = lruFilters.createChild(TAG_CHILD);
 682                                 child.putString(TAG_FILTER_ID, id);
 683                         }
 684                 }
 685         }
 686
 687         private void saveUserDefinedPatterns(IMemento memento) {
 688                 if (fUserDefinedPatterns != null && fUserDefinedPatterns.length > 0) {
 689                         IMemento userDefinedPatterns = memento
 690                                         .createChild(TAG_USER_DEFINED_PATTERNS);
 691                         for (int i = 0; i < fUserDefinedPatterns.length; i++) {
 692                                 IMemento child = userDefinedPatterns.createChild(TAG_CHILD);
 693                                 child.putString(TAG_PATTERN, fUserDefinedPatterns[i]);
 694                         }
 695                 }
 696         }
 697
 698         /**
 699          * Restores the state of the filter actions from a memento.
 700          * <p>
 701          * Note: This method does not refresh the viewer.
 702          * </p>
 703          *
 704          * @param memento
 705          *            the memento from which the state is restored
 706          */
 707         public void restoreState(IMemento memento) {
 708                 if (memento == null)
 709                         return;
 710                 IMemento customFilters = memento.getChild(TAG_CUSTOM_FILTERS);
 711                 if (customFilters == null)
 712                         return;
 713                 String userDefinedPatternsEnabled = customFilters
 714                                 .getString(TAG_USER_DEFINED_PATTERNS_ENABLED);
 715                 if (userDefinedPatternsEnabled == null)
 716                         return;
 717
 718                 fUserDefinedPatternsEnabled = Boolean.valueOf(
 719                                 userDefinedPatternsEnabled).booleanValue();
 720                 restoreUserDefinedPatterns(customFilters);
 721                 restoreXmlDefinedFilters(customFilters);
 722                 restoreLRUFilters(customFilters);
 723
 724                 updateViewerFilters(false);
 725         }
 726
 727         private void restoreUserDefinedPatterns(IMemento memento) {
 728                 IMemento userDefinedPatterns = memento
 729                                 .getChild(TAG_USER_DEFINED_PATTERNS);
 730                 if (userDefinedPatterns != null) {
 731                         IMemento children[] = userDefinedPatterns.getChildren(TAG_CHILD);
 732                         String[] patterns = new String[children.length];
 733                         for (int i = 0; i < children.length; i++)
 734                                 patterns[i] = children[i].getString(TAG_PATTERN);
 735
 736                         setUserDefinedPatterns(patterns);
 737                 } else
 738                         setUserDefinedPatterns(new String[0]);
 739         }
 740
 741         private void restoreXmlDefinedFilters(IMemento memento) {
 742                 IMemento xmlDefinedFilters = memento.getChild(TAG_XML_DEFINED_FILTERS);
 743                 if (xmlDefinedFilters != null) {
 744                         IMemento[] children = xmlDefinedFilters.getChildren(TAG_CHILD);
 745                         for (int i = 0; i < children.length; i++) {
 746                                 String id = children[i].getString(TAG_FILTER_ID);
 747                                 Boolean isEnabled = new Boolean(children[i]
 748                                                 .getString(TAG_IS_ENABLED));
 749                                 fEnabledFilterIds.put(id, isEnabled);
 750                         }
 751                 }
 752         }
 753
 754         private void restoreLRUFilters(IMemento memento) {
 755                 IMemento lruFilters = memento.getChild(TAG_LRU_FILTERS);
 756                 fLRUFilterIdsStack.clear();
 757                 if (lruFilters != null) {
 758                         IMemento[] children = lruFilters.getChildren(TAG_CHILD);
 759                         for (int i = 0; i < children.length; i++) {
 760                                 String id = children[i].getString(TAG_FILTER_ID);
 761                                 if (fFilterDescriptorMap.containsKey(id)
 762                                                 && !fLRUFilterIdsStack.contains(id))
 763                                         fLRUFilterIdsStack.push(id);
 764                         }
 765                 }
 766         }
 767
 768         private void cleanUpPatternDuplicates() {
 769                 if (!areUserDefinedPatternsEnabled())
 770                         return;
 771                 List userDefinedPatterns = new ArrayList(Arrays
 772                                 .asList(fUserDefinedPatterns));
 773                 FilterDescriptor[] filters = FilterDescriptor
 774                                 .getFilterDescriptors(fTargetId);
 775
 776                 for (int i = 0; i < filters.length; i++) {
 777                         if (filters[i].isPatternFilter()) {
 778                                 String pattern = filters[i].getPattern();
 779                                 if (userDefinedPatterns.contains(pattern)) {
 780                                         fEnabledFilterIds.put(filters[i].getId(), Boolean.TRUE);
 781                                         boolean hasMore = true;
 782                                         while (hasMore)
 783                                                 hasMore = userDefinedPatterns.remove(pattern);
 784                                 }
 785                         }
 786                 }
 787                 fUserDefinedPatterns = (String[]) userDefinedPatterns
 788                                 .toArray(new String[userDefinedPatterns.size()]);
 789                 setUserDefinedPatternsEnabled(fUserDefinedPatternsEnabled
 790                                 && fUserDefinedPatterns.length > 0);
 791         }
 792
 793         // ---------- dialog related code ----------
 794
 795         private void openDialog() {
 796                 CustomFiltersDialog dialog = new CustomFiltersDialog(fViewer
 797                                 .getControl().getShell(), fTargetId,
 798                                 areUserDefinedPatternsEnabled(), fUserDefinedPatterns,
 799                                 getEnabledFilterIds());
 800
 801                 if (dialog.open() == Window.OK) {
 802                         setEnabledFilterIds(dialog.getEnabledFilterIds());
 803                         setUserDefinedPatternsEnabled(dialog
 804                                         .areUserDefinedPatternsEnabled());
 805                         setUserDefinedPatterns(dialog.getUserDefinedPatterns());
 806                         setRecentlyChangedFilters(dialog.getFilterDescriptorChangeHistory());
 807
 808                         storeViewDefaults();
 809
 810                         updateViewerFilters(true);
 811                 }
 812         }
 813 }