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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.text.spelling;
  13
  14 import java.io.IOException;
  15 import java.io.InputStream;
  16 import java.net.MalformedURLException;
  17 import java.net.URL;
  18 import java.util.HashMap;
  19 import java.util.HashSet;
  20 import java.util.Iterator;
  21 import java.util.Locale;
  22 import java.util.Map;
  23 import java.util.Set;
  24
  25 import net.sourceforge.phpdt.internal.ui.PHPUIMessages;
  26 import net.sourceforge.phpdt.internal.ui.text.spelling.engine.DefaultSpellChecker;
  27 import net.sourceforge.phpdt.internal.ui.text.spelling.engine.ISpellCheckEngine;
  28 import net.sourceforge.phpdt.internal.ui.text.spelling.engine.ISpellCheckPreferenceKeys;
  29 import net.sourceforge.phpdt.internal.ui.text.spelling.engine.ISpellChecker;
  30 import net.sourceforge.phpdt.internal.ui.text.spelling.engine.ISpellDictionary;
  31 import net.sourceforge.phpdt.internal.ui.text.spelling.engine.PersistentSpellDictionary;
  32 import net.sourceforge.phpeclipse.ui.WebUI;
  33 //import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  34
  35 import org.eclipse.jface.preference.IPreferenceStore;
  36 import org.eclipse.jface.util.IPropertyChangeListener;
  37 import org.eclipse.jface.util.PropertyChangeEvent;
  38
  39 /**
  40  * Spell check engine for Java source spell checking.
  41  *
  42  * @since 3.0
  43  */
  44 public class SpellCheckEngine implements ISpellCheckEngine,
  45                 IPropertyChangeListener {
  46
  47         /** The dictionary location */
  48         public static final String DICTIONARY_LOCATION = "dictionaries/"; //$NON-NLS-1$
  49
  50         /** The singleton spell checker instance */
  51         private static ISpellChecker fChecker = null;
  52
  53         /** The singleton engine instance */
  54         private static ISpellCheckEngine fEngine = null;
  55
  56         /**
  57          * Returns the available locales for this spell check engine.
  58          *
  59          * @return The available locales for this engine
  60          */
  61         public static Set getAvailableLocales() {
  62
  63                 URL url = null;
  64                 Locale locale = null;
  65                 InputStream stream = null;
  66
  67                 final Set result = new HashSet();
  68                 try {
  69
  70                         final URL location = getDictionaryLocation();
  71                         final Locale[] locales = Locale.getAvailableLocales();
  72
  73                         for (int index = 0; index < locales.length; index++) {
  74
  75                                 locale = locales[index];
  76                                 url = new URL(
  77                                                 location,
  78                                                 locale.toString().toLowerCase()
  79                                                                 + "." + PHPUIMessages.getString("Spelling.dictionary.file.extension")); //$NON-NLS-1$ //$NON-NLS-2$
  80
  81                                 try {
  82                                         stream = url.openStream();
  83                                         if (stream != null) {
  84                                                 try {
  85                                                         result.add(locale);
  86                                                 } finally {
  87                                                         stream.close();
  88                                                 }
  89                                         }
  90                                 } catch (IOException exception) {
  91                                         // Do nothing
  92                                 }
  93                         }
  94                 } catch (MalformedURLException exception) {
  95                         // Do nothing
  96                 }
  97                 result.add(getDefaultLocale());
  98
  99                 return result;
 100         }
 101
 102         /**
 103          * Returns the default locale for this engine.
 104          *
 105          * @return The default locale
 106          */
 107         public static Locale getDefaultLocale() {
 108                 return Locale.US;
 109         }
 110
 111         /**
 112          * Returns the dictionary location.
 113          *
 114          * @throws MalformedURLException
 115          *             if the URL could not be created
 116          * @return The dictionary location, or <code>null</code> iff the location
 117          *         is not known
 118          */
 119         public static URL getDictionaryLocation() throws MalformedURLException {
 120
 121                 final WebUI plugin = WebUI.getDefault();
 122                 if (plugin != null)
 123                         return plugin.getBundle().getEntry("/" + DICTIONARY_LOCATION); //$NON-NLS-1$
 124
 125                 return null;
 126         }
 127
 128         /**
 129          * Returns the singleton instance of the spell check engine.
 130          *
 131          * @return The singleton instance of the spell check engine
 132          */
 133         public static final synchronized ISpellCheckEngine getInstance() {
 134
 135                 if (fEngine == null)
 136                         fEngine = new SpellCheckEngine();
 137
 138                 return fEngine;
 139         }
 140
 141         /** The registered locale insenitive dictionaries */
 142         private final Set fGlobalDictionaries = new HashSet();
 143
 144         /** The current locale */
 145         private Locale fLocale = null;
 146
 147         /** The registered locale sensitive dictionaries */
 148         private final Map fLocaleDictionaries = new HashMap();
 149
 150         /** The preference store where to listen */
 151         private IPreferenceStore fPreferences = null;
 152
 153         /** The user dictionary */
 154         private ISpellDictionary fUserDictionary = null;
 155
 156         /**
 157          * Creates a new spell check manager.
 158          */
 159         private SpellCheckEngine() {
 160
 161                 fGlobalDictionaries.add(new TaskTagDictionary());
 162                 fGlobalDictionaries.add(new HtmlTagDictionary());
 163                 fGlobalDictionaries.add(new JavaDocTagDictionary());
 164
 165                 try {
 166
 167                         Locale locale = null;
 168                         final URL location = getDictionaryLocation();
 169
 170                         for (final Iterator iterator = getAvailableLocales().iterator(); iterator
 171                                         .hasNext();) {
 172
 173                                 locale = (Locale) iterator.next();
 174                                 fLocaleDictionaries.put(locale, new SpellReconcileDictionary(
 175                                                 locale, location));
 176                         }
 177
 178                 } catch (MalformedURLException exception) {
 179                         // Do nothing
 180                 }
 181         }
 182
 183         /*
 184          * @see net.sourceforge.phpdt.ui.text.spelling.engine.ISpellCheckEngine#createSpellChecker(java.util.Locale,org.eclipse.jface.preference.IPreferenceStore)
 185          */
 186         public final synchronized ISpellChecker createSpellChecker(
 187                         final Locale locale, final IPreferenceStore store) {
 188
 189                 if (fLocale != null && fLocale.equals(locale))
 190                         return fChecker;
 191
 192                 if (fChecker == null) {
 193
 194                         fChecker = new DefaultSpellChecker(store);
 195                         store.addPropertyChangeListener(this);
 196
 197                         fPreferences = store;
 198
 199                         ISpellDictionary dictionary = null;
 200                         for (Iterator iterator = fGlobalDictionaries.iterator(); iterator
 201                                         .hasNext();) {
 202
 203                                 dictionary = (ISpellDictionary) iterator.next();
 204                                 fChecker.addDictionary(dictionary);
 205                         }
 206                 }
 207
 208                 ISpellDictionary dictionary = null;
 209                 if (fLocale != null) {
 210
 211                         dictionary = (ISpellDictionary) fLocaleDictionaries.get(fLocale);
 212                         if (dictionary != null) {
 213
 214                                 fChecker.removeDictionary(dictionary);
 215                                 dictionary.unload();
 216                         }
 217                 }
 218                 fLocale = locale;
 219
 220                 dictionary = (ISpellDictionary) fLocaleDictionaries.get(locale);
 221                 if (dictionary == null) {
 222
 223                         if (!getDefaultLocale().equals(locale)) {
 224
 225                                 if (fPreferences != null)
 226                                         fPreferences.removePropertyChangeListener(this);
 227
 228                                 fChecker = null;
 229                                 fLocale = null;
 230                         }
 231
 232                 } else
 233                         fChecker.addDictionary(dictionary);
 234
 235                 if (fPreferences != null)
 236                         propertyChange(new PropertyChangeEvent(
 237                                         this,
 238                                         ISpellCheckPreferenceKeys.SPELLING_USER_DICTIONARY,
 239                                         null,
 240                                         fPreferences
 241                                                         .getString(ISpellCheckPreferenceKeys.SPELLING_USER_DICTIONARY)));
 242
 243                 return fChecker;
 244         }
 245
 246         /*
 247          * @see net.sourceforge.phpdt.ui.text.spelling.engine.ISpellCheckEngine#getLocale()
 248          */
 249         public final Locale getLocale() {
 250                 return fLocale;
 251         }
 252
 253         /*
 254          * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
 255          */
 256         public final void propertyChange(final PropertyChangeEvent event) {
 257
 258                 if (fChecker != null
 259                                 && event.getProperty().equals(
 260                                                 ISpellCheckPreferenceKeys.SPELLING_USER_DICTIONARY)) {
 261
 262                         if (fUserDictionary != null) {
 263
 264                                 fChecker.removeDictionary(fUserDictionary);
 265                                 fUserDictionary = null;
 266                         }
 267
 268                         final String file = (String) event.getNewValue();
 269                         if (file.length() > 0) {
 270
 271                                 try {
 272
 273                                         final URL url = new URL("file", null, file); //$NON-NLS-1$
 274                                         InputStream stream = url.openStream();
 275                                         if (stream != null) {
 276                                                 try {
 277                                                         fUserDictionary = new PersistentSpellDictionary(url);
 278                                                         fChecker.addDictionary(fUserDictionary);
 279                                                 } finally {
 280                                                         stream.close();
 281                                                 }
 282                                         }
 283                                 } catch (MalformedURLException exception) {
 284                                         // Do nothing
 285                                 } catch (IOException exception) {
 286                                         // Do nothing
 287                                 }
 288                         }
 289                 }
 290         }
 291
 292         /*
 293          * @see net.sourceforge.phpdt.ui.text.spelling.engine.ISpellCheckEngine#registerDictionary(net.sourceforge.phpdt.ui.text.spelling.engine.ISpellDictionary)
 294          */
 295         public synchronized final void registerDictionary(
 296                         final ISpellDictionary dictionary) {
 297
 298                 fGlobalDictionaries.add(dictionary);
 299
 300                 if (fChecker != null)
 301                         fChecker.addDictionary(dictionary);
 302         }
 303
 304         /*
 305          * @see net.sourceforge.phpdt.ui.text.spelling.engine.ISpellCheckEngine#registerDictionary(java.util.Locale,net.sourceforge.phpdt.ui.text.spelling.engine.ISpellDictionary)
 306          */
 307         public synchronized final void registerDictionary(final Locale locale,
 308                         final ISpellDictionary dictionary) {
 309
 310                 fLocaleDictionaries.put(locale, dictionary);
 311
 312                 if (fChecker != null && fLocale != null && fLocale.equals(locale))
 313                         fChecker.addDictionary(dictionary);
 314         }
 315
 316         /*
 317          * @see net.sourceforge.phpdt.ui.text.spelling.engine.ISpellCheckEngine#unload()
 318          */
 319         public synchronized final void unload() {
 320
 321                 ISpellDictionary dictionary = null;
 322                 for (final Iterator iterator = fGlobalDictionaries.iterator(); iterator
 323                                 .hasNext();) {
 324
 325                         dictionary = (ISpellDictionary) iterator.next();
 326                         dictionary.unload();
 327                 }
 328
 329                 for (final Iterator iterator = fLocaleDictionaries.values().iterator(); iterator
 330                                 .hasNext();) {
 331
 332                         dictionary = (ISpellDictionary) iterator.next();
 333                         dictionary.unload();
 334                 }
 335
 336                 if (fPreferences != null)
 337                         fPreferences.removePropertyChangeListener(this);
 338
 339                 fUserDictionary = null;
 340                 fChecker = null;
 341         }
 342
 343         /*
 344          * @see net.sourceforge.phpdt.ui.text.spelling.engine.ISpellCheckEngine#unregisterDictionary(net.sourceforge.phpdt.ui.text.spelling.engine.ISpellDictionary)
 345          */
 346         public synchronized final void unregisterDictionary(
 347                         final ISpellDictionary dictionary) {
 348
 349                 fGlobalDictionaries.remove(dictionary);
 350                 fLocaleDictionaries.values().remove(dictionary);
 351
 352                 if (fChecker != null)
 353                         fChecker.removeDictionary(dictionary);
 354
 355                 dictionary.unload();
 356         }
 357 }