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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 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
  12 package net.sourceforge.phpdt.internal.ui.preferences;
  13
  14 import org.eclipse.jface.preference.IPreferenceStore;
  15 import org.eclipse.jface.preference.PreferenceStore;
  16 import org.eclipse.jface.text.Assert;
  17 import org.eclipse.jface.util.IPropertyChangeListener;
  18 import org.eclipse.jface.util.PropertyChangeEvent;
  19
  20 /**
  21  * An overlaying preference store.
  22  */
  23 public class OverlayPreferenceStore implements IPreferenceStore {
  24
  25         public static final class TypeDescriptor {
  26                 private TypeDescriptor() {
  27                 }
  28         }
  29
  30         public static final TypeDescriptor BOOLEAN = new TypeDescriptor();
  31
  32         public static final TypeDescriptor DOUBLE = new TypeDescriptor();
  33
  34         public static final TypeDescriptor FLOAT = new TypeDescriptor();
  35
  36         public static final TypeDescriptor INT = new TypeDescriptor();
  37
  38         public static final TypeDescriptor LONG = new TypeDescriptor();
  39
  40         public static final TypeDescriptor STRING = new TypeDescriptor();
  41
  42         public static class OverlayKey {
  43
  44                 TypeDescriptor fDescriptor;
  45
  46                 String fKey;
  47
  48                 public OverlayKey(TypeDescriptor descriptor, String key) {
  49                         fDescriptor = descriptor;
  50                         fKey = key;
  51                 }
  52         }
  53
  54         private class PropertyListener implements IPropertyChangeListener {
  55
  56                 /*
  57                  * @see IPropertyChangeListener#propertyChange(PropertyChangeEvent)
  58                  */
  59                 public void propertyChange(PropertyChangeEvent event) {
  60                         OverlayKey key = findOverlayKey(event.getProperty());
  61                         if (key != null)
  62                                 propagateProperty(fParent, key, fStore);
  63                 }
  64         }
  65
  66         private IPreferenceStore fParent;
  67
  68         private IPreferenceStore fStore;
  69
  70         private OverlayKey[] fOverlayKeys;
  71
  72         private PropertyListener fPropertyListener;
  73
  74         private boolean fLoaded;
  75
  76         public OverlayPreferenceStore(IPreferenceStore parent,
  77                         OverlayKey[] overlayKeys) {
  78                 fParent = parent;
  79                 fOverlayKeys = overlayKeys;
  80                 fStore = new PreferenceStore();
  81         }
  82
  83         private OverlayKey findOverlayKey(String key) {
  84                 for (int i = 0; i < fOverlayKeys.length; i++) {
  85                         if (fOverlayKeys[i].fKey.equals(key))
  86                                 return fOverlayKeys[i];
  87                 }
  88                 return null;
  89         }
  90
  91         private boolean covers(String key) {
  92                 return (findOverlayKey(key) != null);
  93         }
  94
  95         private void propagateProperty(IPreferenceStore orgin, OverlayKey key,
  96                         IPreferenceStore target) {
  97
  98                 if (orgin.isDefault(key.fKey)) {
  99                         if (!target.isDefault(key.fKey))
 100                                 target.setToDefault(key.fKey);
 101                         return;
 102                 }
 103
 104                 TypeDescriptor d = key.fDescriptor;
 105                 if (BOOLEAN == d) {
 106
 107                         boolean originValue = orgin.getBoolean(key.fKey);
 108                         boolean targetValue = target.getBoolean(key.fKey);
 109                         if (targetValue != originValue)
 110                                 target.setValue(key.fKey, originValue);
 111
 112                 } else if (DOUBLE == d) {
 113
 114                         double originValue = orgin.getDouble(key.fKey);
 115                         double targetValue = target.getDouble(key.fKey);
 116                         if (targetValue != originValue)
 117                                 target.setValue(key.fKey, originValue);
 118
 119                 } else if (FLOAT == d) {
 120
 121                         float originValue = orgin.getFloat(key.fKey);
 122                         float targetValue = target.getFloat(key.fKey);
 123                         if (targetValue != originValue)
 124                                 target.setValue(key.fKey, originValue);
 125
 126                 } else if (INT == d) {
 127
 128                         int originValue = orgin.getInt(key.fKey);
 129                         int targetValue = target.getInt(key.fKey);
 130                         if (targetValue != originValue)
 131                                 target.setValue(key.fKey, originValue);
 132
 133                 } else if (LONG == d) {
 134
 135                         long originValue = orgin.getLong(key.fKey);
 136                         long targetValue = target.getLong(key.fKey);
 137                         if (targetValue != originValue)
 138                                 target.setValue(key.fKey, originValue);
 139
 140                 } else if (STRING == d) {
 141
 142                         String originValue = orgin.getString(key.fKey);
 143                         String targetValue = target.getString(key.fKey);
 144                         if (targetValue != null && originValue != null
 145                                         && !targetValue.equals(originValue))
 146                                 target.setValue(key.fKey, originValue);
 147
 148                 }
 149         }
 150
 151         public void propagate() {
 152                 for (int i = 0; i < fOverlayKeys.length; i++)
 153                         propagateProperty(fStore, fOverlayKeys[i], fParent);
 154         }
 155
 156         private void loadProperty(IPreferenceStore orgin, OverlayKey key,
 157                         IPreferenceStore target, boolean forceInitialization) {
 158                 TypeDescriptor d = key.fDescriptor;
 159                 if (BOOLEAN == d) {
 160
 161                         if (forceInitialization)
 162                                 target.setValue(key.fKey, true);
 163                         target.setValue(key.fKey, orgin.getBoolean(key.fKey));
 164                         target.setDefault(key.fKey, orgin.getDefaultBoolean(key.fKey));
 165
 166                 } else if (DOUBLE == d) {
 167
 168                         if (forceInitialization)
 169                                 target.setValue(key.fKey, 1.0D);
 170                         target.setValue(key.fKey, orgin.getDouble(key.fKey));
 171                         target.setDefault(key.fKey, orgin.getDefaultDouble(key.fKey));
 172
 173                 } else if (FLOAT == d) {
 174
 175                         if (forceInitialization)
 176                                 target.setValue(key.fKey, 1.0F);
 177                         target.setValue(key.fKey, orgin.getFloat(key.fKey));
 178                         target.setDefault(key.fKey, orgin.getDefaultFloat(key.fKey));
 179
 180                 } else if (INT == d) {
 181
 182                         if (forceInitialization)
 183                                 target.setValue(key.fKey, 1);
 184                         target.setValue(key.fKey, orgin.getInt(key.fKey));
 185                         target.setDefault(key.fKey, orgin.getDefaultInt(key.fKey));
 186
 187                 } else if (LONG == d) {
 188
 189                         if (forceInitialization)
 190                                 target.setValue(key.fKey, 1L);
 191                         target.setValue(key.fKey, orgin.getLong(key.fKey));
 192                         target.setDefault(key.fKey, orgin.getDefaultLong(key.fKey));
 193
 194                 } else if (STRING == d) {
 195
 196                         if (forceInitialization)
 197                                 target.setValue(key.fKey, "1"); //$NON-NLS-1$
 198                         target.setValue(key.fKey, orgin.getString(key.fKey));
 199                         target.setDefault(key.fKey, orgin.getDefaultString(key.fKey));
 200
 201                 }
 202         }
 203
 204         public void load() {
 205                 for (int i = 0; i < fOverlayKeys.length; i++)
 206                         loadProperty(fParent, fOverlayKeys[i], fStore, true);
 207
 208                 fLoaded = true;
 209
 210         }
 211
 212         public void loadDefaults() {
 213                 for (int i = 0; i < fOverlayKeys.length; i++)
 214                         setToDefault(fOverlayKeys[i].fKey);
 215         }
 216
 217         public void start() {
 218                 if (fPropertyListener == null) {
 219                         fPropertyListener = new PropertyListener();
 220                         fParent.addPropertyChangeListener(fPropertyListener);
 221                 }
 222         }
 223
 224         public void stop() {
 225                 if (fPropertyListener != null) {
 226                         fParent.removePropertyChangeListener(fPropertyListener);
 227                         fPropertyListener = null;
 228                 }
 229         }
 230
 231         /*
 232          * @see IPreferenceStore#addPropertyChangeListener(IPropertyChangeListener)
 233          */
 234         public void addPropertyChangeListener(IPropertyChangeListener listener) {
 235                 fStore.addPropertyChangeListener(listener);
 236         }
 237
 238         /*
 239          * @see IPreferenceStore#removePropertyChangeListener(IPropertyChangeListener)
 240          */
 241         public void removePropertyChangeListener(IPropertyChangeListener listener) {
 242                 fStore.removePropertyChangeListener(listener);
 243         }
 244
 245         /*
 246          * @see IPreferenceStore#firePropertyChangeEvent(String, Object, Object)
 247          */
 248         public void firePropertyChangeEvent(String name, Object oldValue,
 249                         Object newValue) {
 250                 fStore.firePropertyChangeEvent(name, oldValue, newValue);
 251         }
 252
 253         /*
 254          * @see IPreferenceStore#contains(String)
 255          */
 256         public boolean contains(String name) {
 257                 return fStore.contains(name);
 258         }
 259
 260         /*
 261          * @see IPreferenceStore#getBoolean(String)
 262          */
 263         public boolean getBoolean(String name) {
 264                 return fStore.getBoolean(name);
 265         }
 266
 267         /*
 268          * @see IPreferenceStore#getDefaultBoolean(String)
 269          */
 270         public boolean getDefaultBoolean(String name) {
 271                 return fStore.getDefaultBoolean(name);
 272         }
 273
 274         /*
 275          * @see IPreferenceStore#getDefaultDouble(String)
 276          */
 277         public double getDefaultDouble(String name) {
 278                 return fStore.getDefaultDouble(name);
 279         }
 280
 281         /*
 282          * @see IPreferenceStore#getDefaultFloat(String)
 283          */
 284         public float getDefaultFloat(String name) {
 285                 return fStore.getDefaultFloat(name);
 286         }
 287
 288         /*
 289          * @see IPreferenceStore#getDefaultInt(String)
 290          */
 291         public int getDefaultInt(String name) {
 292                 return fStore.getDefaultInt(name);
 293         }
 294
 295         /*
 296          * @see IPreferenceStore#getDefaultLong(String)
 297          */
 298         public long getDefaultLong(String name) {
 299                 return fStore.getDefaultLong(name);
 300         }
 301
 302         /*
 303          * @see IPreferenceStore#getDefaultString(String)
 304          */
 305         public String getDefaultString(String name) {
 306                 return fStore.getDefaultString(name);
 307         }
 308
 309         /*
 310          * @see IPreferenceStore#getDouble(String)
 311          */
 312         public double getDouble(String name) {
 313                 return fStore.getDouble(name);
 314         }
 315
 316         /*
 317          * @see IPreferenceStore#getFloat(String)
 318          */
 319         public float getFloat(String name) {
 320                 return fStore.getFloat(name);
 321         }
 322
 323         /*
 324          * @see IPreferenceStore#getInt(String)
 325          */
 326         public int getInt(String name) {
 327                 return fStore.getInt(name);
 328         }
 329
 330         /*
 331          * @see IPreferenceStore#getLong(String)
 332          */
 333         public long getLong(String name) {
 334                 return fStore.getLong(name);
 335         }
 336
 337         /*
 338          * @see IPreferenceStore#getString(String)
 339          */
 340         public String getString(String name) {
 341                 return fStore.getString(name);
 342         }
 343
 344         /*
 345          * @see IPreferenceStore#isDefault(String)
 346          */
 347         public boolean isDefault(String name) {
 348                 return fStore.isDefault(name);
 349         }
 350
 351         /*
 352          * @see IPreferenceStore#needsSaving()
 353          */
 354         public boolean needsSaving() {
 355                 return fStore.needsSaving();
 356         }
 357
 358         /*
 359          * @see IPreferenceStore#putValue(String, String)
 360          */
 361         public void putValue(String name, String value) {
 362                 if (covers(name))
 363                         fStore.putValue(name, value);
 364         }
 365
 366         /*
 367          * @see IPreferenceStore#setDefault(String, double)
 368          */
 369         public void setDefault(String name, double value) {
 370                 if (covers(name))
 371                         fStore.setDefault(name, value);
 372         }
 373
 374         /*
 375          * @see IPreferenceStore#setDefault(String, float)
 376          */
 377         public void setDefault(String name, float value) {
 378                 if (covers(name))
 379                         fStore.setDefault(name, value);
 380         }
 381
 382         /*
 383          * @see IPreferenceStore#setDefault(String, int)
 384          */
 385         public void setDefault(String name, int value) {
 386                 if (covers(name))
 387                         fStore.setDefault(name, value);
 388         }
 389
 390         /*
 391          * @see IPreferenceStore#setDefault(String, long)
 392          */
 393         public void setDefault(String name, long value) {
 394                 if (covers(name))
 395                         fStore.setDefault(name, value);
 396         }
 397
 398         /*
 399          * @see IPreferenceStore#setDefault(String, String)
 400          */
 401         public void setDefault(String name, String value) {
 402                 if (covers(name))
 403                         fStore.setDefault(name, value);
 404         }
 405
 406         /*
 407          * @see IPreferenceStore#setDefault(String, boolean)
 408          */
 409         public void setDefault(String name, boolean value) {
 410                 if (covers(name))
 411                         fStore.setDefault(name, value);
 412         }
 413
 414         /*
 415          * @see IPreferenceStore#setToDefault(String)
 416          */
 417         public void setToDefault(String name) {
 418                 fStore.setToDefault(name);
 419         }
 420
 421         /*
 422          * @see IPreferenceStore#setValue(String, double)
 423          */
 424         public void setValue(String name, double value) {
 425                 if (covers(name))
 426                         fStore.setValue(name, value);
 427         }
 428
 429         /*
 430          * @see IPreferenceStore#setValue(String, float)
 431          */
 432         public void setValue(String name, float value) {
 433                 if (covers(name))
 434                         fStore.setValue(name, value);
 435         }
 436
 437         /*
 438          * @see IPreferenceStore#setValue(String, int)
 439          */
 440         public void setValue(String name, int value) {
 441                 if (covers(name))
 442                         fStore.setValue(name, value);
 443         }
 444
 445         /*
 446          * @see IPreferenceStore#setValue(String, long)
 447          */
 448         public void setValue(String name, long value) {
 449                 if (covers(name))
 450                         fStore.setValue(name, value);
 451         }
 452
 453         /*
 454          * @see IPreferenceStore#setValue(String, String)
 455          */
 456         public void setValue(String name, String value) {
 457                 if (covers(name))
 458                         fStore.setValue(name, value);
 459         }
 460
 461         /*
 462          * @see IPreferenceStore#setValue(String, boolean)
 463          */
 464         public void setValue(String name, boolean value) {
 465                 if (covers(name))
 466                         fStore.setValue(name, value);
 467         }
 468
 469         /**
 470          * The keys to add to the list of overlay keys.
 471          * <p>
 472          * Note: This method must be called before {@link #load()} is called.
 473          * </p>
 474          *
 475          * @param keys
 476          * @since 3.0
 477          */
 478         public void addKeys(OverlayKey[] keys) {
 479                 Assert.isTrue(!fLoaded);
 480                 Assert.isNotNull(keys);
 481
 482                 int overlayKeysLength = fOverlayKeys.length;
 483                 OverlayKey[] result = new OverlayKey[keys.length + overlayKeysLength];
 484
 485                 for (int i = 0, length = overlayKeysLength; i < length; i++)
 486                         result[i] = fOverlayKeys[i];
 487
 488                 for (int i = 0, length = keys.length; i < length; i++)
 489                         result[overlayKeysLength + i] = keys[i];
 490
 491                 fOverlayKeys = result;
 492
 493                 if (fLoaded)
 494                         load();
 495         }
 496 }