Merge "Remove UserUnigramDictionary."

1 files changed, 0 insertions, 276 deletions

diff --git a/java/src/com/android/inputmethod/latin/UserUnigramDictionary.java b/java/src/com/android/inputmethod/latin/UserUnigramDictionary.java
deleted file mode 100644
index e278b2597..000000000
--- a/java/src/com/android/inputmethod/latin/UserUnigramDictionary.java
+++ /dev/null
@@ -1,276 +0,0 @@
-/*
- * Copyright (C) 2010 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 android.content.ContentValues;
-import android.content.Context;
-import android.database.Cursor;
-import android.database.sqlite.SQLiteDatabase;
-import android.database.sqlite.SQLiteOpenHelper;
-import android.database.sqlite.SQLiteQueryBuilder;
-import android.os.AsyncTask;
-import android.provider.BaseColumns;
-import android.util.Log;
-
-import java.util.HashMap;
-import java.util.Map.Entry;
-import java.util.Set;
-
-/**
- * This class (inherited from the old AutoDictionary) is used for user history
- * based dictionary. It stores words that the user typed to supply a provision
- * for suggesting and re-ordering of candidates.
- */
-class UserUnigramDictionary extends ExpandableDictionary {
-    static final boolean ENABLE_USER_UNIGRAM_DICTIONARY = false;
-
-    // Weight added to a user picking a new word from the suggestion strip
-    static final int FREQUENCY_FOR_PICKED = 3;
-    // Weight added to a user typing a new word that doesn't get corrected (or is reverted)
-    static final int FREQUENCY_FOR_TYPED = 1;
-    // If the user touches a typed word 2 times or more, it will become valid.
-    private static final int VALIDITY_THRESHOLD = 2 * FREQUENCY_FOR_PICKED;
-
-    private LatinIME mIme;
-    // Locale for which this user unigram dictionary is storing words
-    private String mLocale;
-
-    private HashMap<String,Integer> mPendingWrites = new HashMap<String,Integer>();
-    private final Object mPendingWritesLock = new Object();
-
-    // TODO: we should probably change the database name
-    private static final String DATABASE_NAME = "auto_dict.db";
-    private static final int DATABASE_VERSION = 1;
-
-    // These are the columns in the dictionary
-    // TODO: Consume less space by using a unique id for locale instead of the whole
-    // 2-5 character string.
-    private static final String COLUMN_ID = BaseColumns._ID;
-    private static final String COLUMN_WORD = "word";
-    private static final String COLUMN_FREQUENCY = "freq";
-    private static final String COLUMN_LOCALE = "locale";
-
-    /** Sort by descending order of frequency. */
-    public static final String DEFAULT_SORT_ORDER = COLUMN_FREQUENCY + " DESC";
-
-    /** Name of the words table in the database */
-    private static final String USER_UNIGRAM_DICT_TABLE_NAME = "words";
-
-    private static HashMap<String, String> sDictProjectionMap;
-
-    static {
-        if (ENABLE_USER_UNIGRAM_DICTIONARY) {
-            sDictProjectionMap = new HashMap<String, String>();
-            sDictProjectionMap.put(COLUMN_ID, COLUMN_ID);
-            sDictProjectionMap.put(COLUMN_WORD, COLUMN_WORD);
-            sDictProjectionMap.put(COLUMN_FREQUENCY, COLUMN_FREQUENCY);
-            sDictProjectionMap.put(COLUMN_LOCALE, COLUMN_LOCALE);
-        }
-    }
-
-    private static DatabaseHelper sOpenHelper = null;
-
-    public UserUnigramDictionary(Context context, LatinIME ime, String locale, int dicTypeId) {
-        super(context, dicTypeId);
-        // Super must be first statement of the constructor... I'd like not to do it if the
-        // user unigram dictionary is not enabled, but Java won't let me.
-        if (!ENABLE_USER_UNIGRAM_DICTIONARY) return;
-        mIme = ime;
-        mLocale = locale;
-        if (sOpenHelper == null) {
-            sOpenHelper = new DatabaseHelper(getContext());
-        }
-        if (mLocale != null && mLocale.length() > 1) {
-            loadDictionary();
-        }
-    }
-
-    @Override
-    public synchronized boolean isValidWord(CharSequence word) {
-        if (!ENABLE_USER_UNIGRAM_DICTIONARY) return false;
-        final int frequency = getWordFrequency(word);
-        return frequency >= VALIDITY_THRESHOLD;
-    }
-
-    @Override
-    public void close() {
-        super.close();
-        if (!ENABLE_USER_UNIGRAM_DICTIONARY) return;
-        flushPendingWrites();
-        // Don't close the database as locale changes will require it to be reopened anyway
-        // Also, the database is written to somewhat frequently, so it needs to be kept alive
-        // throughout the life of the process.
-        // mOpenHelper.close();
-    }
-
-    @Override
-    public void loadDictionaryAsync() {
-        if (!ENABLE_USER_UNIGRAM_DICTIONARY) return;
-        // Load the words that correspond to the current input locale
-        final Cursor cursor = query(COLUMN_LOCALE + "=?", new String[] { mLocale });
-        if (null == cursor) return;
-        try {
-            if (cursor.moveToFirst()) {
-                int wordIndex = cursor.getColumnIndex(COLUMN_WORD);
-                int frequencyIndex = cursor.getColumnIndex(COLUMN_FREQUENCY);
-                while (!cursor.isAfterLast()) {
-                    String word = cursor.getString(wordIndex);
-                    int frequency = cursor.getInt(frequencyIndex);
-                    // Safeguard against adding really long words. Stack may overflow due
-                    // to recursive lookup
-                    if (word.length() < getMaxWordLength()) {
-                        super.addWord(word, frequency);
-                    }
-                    cursor.moveToNext();
-                }
-            }
-        } finally {
-            cursor.close();
-        }
-    }
-
-    public void addUnigram(String newWord) {
-        if (!ENABLE_USER_UNIGRAM_DICTIONARY) return;
-        final int addFrequency = FREQUENCY_FOR_TYPED;
-        String word = newWord;
-        final int length = word.length();
-        // Don't add very short or very long words.
-        if (length < 2 || length > getMaxWordLength()) return;
-        if (mIme.isAutoCapitalized()) {
-            // Remove caps before adding
-            word = Character.toLowerCase(word.charAt(0)) + word.substring(1);
-        }
-        int freq = getWordFrequency(word);
-        freq = freq < 0 ? addFrequency : freq + addFrequency;
-        super.addWord(word, freq);
-
-        synchronized (mPendingWritesLock) {
-            // Write a null frequency if it is to be deleted from the db
-            mPendingWrites.put(word, freq == 0 ? null : new Integer(freq));
-        }
-    }
-
-    /**
-     * Schedules a background thread to write any pending words to the database.
-     */
-    public void flushPendingWrites() {
-        if (!ENABLE_USER_UNIGRAM_DICTIONARY) return;
-        synchronized (mPendingWritesLock) {
-            // Nothing pending? Return
-            if (mPendingWrites.isEmpty()) return;
-            // Create a background thread to write the pending entries
-            new UpdateDbTask(sOpenHelper, mPendingWrites, mLocale).execute();
-            // Create a new map for writing new entries into while the old one is written to db
-            mPendingWrites = new HashMap<String, Integer>();
-        }
-    }
-
-    /**
-     * This class helps open, create, and upgrade the database file.
-     */
-    private static class DatabaseHelper extends SQLiteOpenHelper {
-
-        DatabaseHelper(Context context) {
-            super(context, DATABASE_NAME, null, DATABASE_VERSION);
-        }
-
-        @Override
-        public void onCreate(SQLiteDatabase db) {
-            db.execSQL("CREATE TABLE " + USER_UNIGRAM_DICT_TABLE_NAME + " ("
-                    + COLUMN_ID + " INTEGER PRIMARY KEY,"
-                    + COLUMN_WORD + " TEXT,"
-                    + COLUMN_FREQUENCY + " INTEGER,"
-                    + COLUMN_LOCALE + " TEXT"
-                    + ");");
-        }
-
-        @Override
-        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
-            Log.w("UserUnigramDictionary", "Upgrading database from version " + oldVersion + " to "
-                    + newVersion + ", which will destroy all old data");
-            db.execSQL("DROP TABLE IF EXISTS " + USER_UNIGRAM_DICT_TABLE_NAME);
-            onCreate(db);
-        }
-    }
-
-    private static Cursor query(String selection, String[] selectionArgs) {
-        SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
-        qb.setTables(USER_UNIGRAM_DICT_TABLE_NAME);
-        qb.setProjectionMap(sDictProjectionMap);
-
-        // Get the database and run the query
-        try {
-            SQLiteDatabase db = sOpenHelper.getReadableDatabase();
-            Cursor c = qb.query(db, null, selection, selectionArgs, null, null,
-                    DEFAULT_SORT_ORDER);
-            return c;
-        } catch (android.database.sqlite.SQLiteCantOpenDatabaseException e) {
-            // Can't open the database : presumably we can't access storage. That may happen
-            // when the device is wedged; do a best effort to still start the keyboard.
-            return null;
-        }
-    }
-
-    /**
-     * Async task to write pending words to the database so that it stays in sync with
-     * the in-memory trie.
-     */
-    private static class UpdateDbTask extends AsyncTask<Void, Void, Void> {
-        private final HashMap<String, Integer> mMap;
-        private final DatabaseHelper mDbHelper;
-        private final String mLocale;
-
-        public UpdateDbTask(DatabaseHelper openHelper, HashMap<String, Integer> pendingWrites,
-                String locale) {
-            mMap = pendingWrites;
-            mLocale = locale;
-            mDbHelper = openHelper;
-        }
-
-        @Override
-        protected Void doInBackground(Void... v) {
-            SQLiteDatabase db = null;
-            try {
-                db = mDbHelper.getWritableDatabase();
-            } catch (android.database.sqlite.SQLiteCantOpenDatabaseException e) {
-                // With no access to the DB, this is moot. Do nothing: we'll exit through the
-                // test for null == db.
-            }
-            if (null == db) return null;
-            // Write all the entries to the db
-            Set<Entry<String,Integer>> mEntries = mMap.entrySet();
-            for (Entry<String,Integer> entry : mEntries) {
-                Integer freq = entry.getValue();
-                db.delete(USER_UNIGRAM_DICT_TABLE_NAME, COLUMN_WORD + "=? AND " + COLUMN_LOCALE
-                        + "=?", new String[] { entry.getKey(), mLocale });
-                if (freq != null) {
-                    db.insert(USER_UNIGRAM_DICT_TABLE_NAME, null,
-                            getContentValues(entry.getKey(), freq, mLocale));
-                }
-            }
-            return null;
-        }
-
-        private static ContentValues getContentValues(String word, int frequency, String locale) {
-            ContentValues values = new ContentValues(4);
-            values.put(COLUMN_WORD, word);
-            values.put(COLUMN_FREQUENCY, frequency);
-            values.put(COLUMN_LOCALE, locale);
-            return values;
-        }
-    }
-}