1 files changed, 138 insertions, 0 deletions
diff --git a/java/src/com/android/inputmethod/latin/UserDictionary.java b/java/src/com/android/inputmethod/latin/UserDictionary.java
new file mode 100644
index 000000000..4b98eacce
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/UserDictionary.java
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+import android.content.ContentResolver;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.ContentObserver;
+import android.database.Cursor;
+import android.net.Uri;
+import android.provider.UserDictionary.Words;
+
+public class UserDictionary extends ExpandableDictionary {
+    
+    private static final String[] PROJECTION = {
+        Words._ID,
+        Words.WORD,
+        Words.FREQUENCY
+    };
+    
+    private static final int INDEX_WORD = 1;
+    private static final int INDEX_FREQUENCY = 2;
+    
+    private ContentObserver mObserver;
+    
+    private boolean mRequiresReload;
+    private String mLocale;
+
+    public UserDictionary(Context context, String locale) {
+        super(context);
+        mLocale = locale;
+        // Perform a managed query. The Activity will handle closing and requerying the cursor
+        // when needed.
+        ContentResolver cres = context.getContentResolver();
+        
+        cres.registerContentObserver(Words.CONTENT_URI, true, mObserver = new ContentObserver(null) {
+            @Override
+            public void onChange(boolean self) {
+                mRequiresReload = true;
+            }
+        });
+
+        loadDictionary();
+    }
+    
+    public synchronized void close() {
+        if (mObserver != null) {
+            getContext().getContentResolver().unregisterContentObserver(mObserver);
+            mObserver = null;
+        }
+    }
+    
+    private synchronized void loadDictionary() {
+        Cursor cursor = getContext().getContentResolver()
+                .query(Words.CONTENT_URI, PROJECTION, "(locale IS NULL) or (locale=?)", 
+                        new String[] { mLocale }, null);
+        addWords(cursor);
+        mRequiresReload = false;
+    }
+
+    /**
+     * Adds a word to the dictionary and makes it persistent.
+     * @param word the word to add. If the word is capitalized, then the dictionary will
+     * recognize it as a capitalized word when searched.
+     * @param frequency the frequency of occurrence of the word. A frequency of 255 is considered
+     * the highest.
+     * @TODO use a higher or float range for frequency
+     */
+    @Override
+    public synchronized void addWord(String word, int frequency) {
+        if (mRequiresReload) loadDictionary();
+        // Safeguard against adding long words. Can cause stack overflow.
+        if (word.length() >= getMaxWordLength()) return;
+
+        super.addWord(word, frequency);
+
+        // Update the user dictionary provider
+        ContentValues values = new ContentValues(5);
+        values.put(Words.WORD, word);
+        values.put(Words.FREQUENCY, frequency);
+        values.put(Words.LOCALE, mLocale);
+        values.put(Words.APP_ID, 0);
+
+        getContext().getContentResolver().insert(Words.CONTENT_URI, values);
+        // In case the above does a synchronous callback of the change observer
+        mRequiresReload = false;
+    }
+
+    @Override
+    public synchronized void getWords(final WordComposer codes, final WordCallback callback,
+            int[] nextLettersFrequencies) {
+        if (mRequiresReload) loadDictionary();
+        super.getWords(codes, callback, nextLettersFrequencies);
+    }
+
+    @Override
+    public synchronized boolean isValidWord(CharSequence word) {
+        if (mRequiresReload) loadDictionary();
+        return super.isValidWord(word);
+    }
+
+    private void addWords(Cursor cursor) {
+        clearDictionary();
+
+        final int maxWordLength = getMaxWordLength();
+        if (cursor.moveToFirst()) {
+            while (!cursor.isAfterLast()) {
+                String word = cursor.getString(INDEX_WORD);
+                int frequency = cursor.getInt(INDEX_FREQUENCY);
+                // Safeguard against adding really long words. Stack may overflow due
+                // to recursion
+                if (word.length() < maxWordLength) {
+                    super.addWord(word, frequency);
+                }
+                cursor.moveToNext();
+            }
+        }
+        cursor.close();
+    }
+}