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/*
* 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();
}
}
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