ac27e4544b
This is a preparative change to bug#6313806 Change-Id: I1be9ec49b21005c1f45ce459fa93712bc74ef3f0
207 lines
8.3 KiB
Java
207 lines
8.3 KiB
Java
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.latin;
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import android.content.ContentProviderClient;
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import android.content.ContentResolver;
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import android.content.Context;
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import android.content.Intent;
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import android.database.ContentObserver;
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import android.database.Cursor;
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import android.provider.UserDictionary.Words;
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import android.text.TextUtils;
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import com.android.inputmethod.keyboard.ProximityInfo;
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import java.util.Arrays;
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public class UserDictionary extends ExpandableDictionary {
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private static final String[] PROJECTION_QUERY = {
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Words.WORD,
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Words.FREQUENCY,
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};
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// This is not exported by the framework so we pretty much have to write it here verbatim
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private static final String ACTION_USER_DICTIONARY_INSERT =
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"com.android.settings.USER_DICTIONARY_INSERT";
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private ContentObserver mObserver;
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final private String mLocale;
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final private boolean mAlsoUseMoreRestrictiveLocales;
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public UserDictionary(final Context context, final String locale) {
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this(context, locale, false);
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}
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public UserDictionary(final Context context, final String locale,
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final boolean alsoUseMoreRestrictiveLocales) {
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super(context, Suggest.DIC_USER);
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if (null == locale) throw new NullPointerException(); // Catch the error earlier
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mLocale = locale;
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mAlsoUseMoreRestrictiveLocales = alsoUseMoreRestrictiveLocales;
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// Perform a managed query. The Activity will handle closing and re-querying the cursor
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// when needed.
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ContentResolver cres = context.getContentResolver();
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mObserver = new ContentObserver(null) {
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@Override
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public void onChange(boolean self) {
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setRequiresReload(true);
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}
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};
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cres.registerContentObserver(Words.CONTENT_URI, true, mObserver);
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loadDictionary();
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}
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@Override
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public synchronized void close() {
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if (mObserver != null) {
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getContext().getContentResolver().unregisterContentObserver(mObserver);
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mObserver = null;
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}
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super.close();
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}
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@Override
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public void loadDictionaryAsync() {
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// Split the locale. For example "en" => ["en"], "de_DE" => ["de", "DE"],
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// "en_US_foo_bar_qux" => ["en", "US", "foo_bar_qux"] because of the limit of 3.
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// This is correct for locale processing.
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// For this example, we'll look at the "en_US_POSIX" case.
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final String[] localeElements =
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TextUtils.isEmpty(mLocale) ? new String[] {} : mLocale.split("_", 3);
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final int length = localeElements.length;
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final StringBuilder request = new StringBuilder("(locale is NULL)");
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String localeSoFar = "";
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// At start, localeElements = ["en", "US", "POSIX"] ; localeSoFar = "" ;
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// and request = "(locale is NULL)"
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for (int i = 0; i < length; ++i) {
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// i | localeSoFar | localeElements
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// 0 | "" | ["en", "US", "POSIX"]
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// 1 | "en_" | ["en", "US", "POSIX"]
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// 2 | "en_US_" | ["en", "en_US", "POSIX"]
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localeElements[i] = localeSoFar + localeElements[i];
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localeSoFar = localeElements[i] + "_";
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// i | request
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// 0 | "(locale is NULL)"
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// 1 | "(locale is NULL) or (locale=?)"
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// 2 | "(locale is NULL) or (locale=?) or (locale=?)"
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request.append(" or (locale=?)");
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}
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// At the end, localeElements = ["en", "en_US", "en_US_POSIX"]; localeSoFar = en_US_POSIX_"
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// and request = "(locale is NULL) or (locale=?) or (locale=?) or (locale=?)"
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final String[] requestArguments;
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// If length == 3, we already have all the arguments we need (common prefix is meaningless
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// inside variants
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if (mAlsoUseMoreRestrictiveLocales && length < 3) {
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request.append(" or (locale like ?)");
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// The following creates an array with one more (null) position
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final String[] localeElementsWithMoreRestrictiveLocalesIncluded =
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Arrays.copyOf(localeElements, length + 1);
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localeElementsWithMoreRestrictiveLocalesIncluded[length] =
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localeElements[length - 1] + "_%";
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requestArguments = localeElementsWithMoreRestrictiveLocalesIncluded;
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// If for example localeElements = ["en"]
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// then requestArguments = ["en", "en_%"]
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// and request = (locale is NULL) or (locale=?) or (locale like ?)
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// If localeElements = ["en", "en_US"]
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// then requestArguments = ["en", "en_US", "en_US_%"]
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} else {
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requestArguments = localeElements;
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}
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final Cursor cursor = getContext().getContentResolver()
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.query(Words.CONTENT_URI, PROJECTION_QUERY, request.toString(),
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requestArguments, null);
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try {
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addWords(cursor);
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} finally {
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if (null != cursor) cursor.close();
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}
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}
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public boolean isEnabled() {
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final ContentResolver cr = getContext().getContentResolver();
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final ContentProviderClient client = cr.acquireContentProviderClient(Words.CONTENT_URI);
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if (client != null) {
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client.release();
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return true;
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} else {
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return false;
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}
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}
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/**
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* Adds a word to the dictionary and makes it persistent.
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* @param word the word to add. If the word is capitalized, then the dictionary will
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* recognize it as a capitalized word when searched.
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* @param frequency the frequency of occurrence of the word. A frequency of 255 is considered
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* the highest.
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* @TODO use a higher or float range for frequency
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*/
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@Override
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public synchronized void addWord(final String word, final int frequency) {
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// Force load the dictionary here synchronously
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if (getRequiresReload()) loadDictionaryAsync();
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// TODO: do something for the UI. With the following, any sufficiently long word will
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// look like it will go to the user dictionary but it won't.
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// Safeguard against adding long words. Can cause stack overflow.
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if (word.length() >= getMaxWordLength()) return;
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// TODO: Add an argument to the intent to specify the frequency.
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Intent intent = new Intent(ACTION_USER_DICTIONARY_INSERT);
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intent.putExtra(Words.WORD, word);
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intent.putExtra(Words.LOCALE, mLocale);
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intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
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getContext().startActivity(intent);
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}
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@Override
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public synchronized void getWords(final WordComposer codes,
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final CharSequence prevWordForBigrams, final WordCallback callback,
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final ProximityInfo proximityInfo) {
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super.getWords(codes, prevWordForBigrams, callback, proximityInfo);
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}
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@Override
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public synchronized boolean isValidWord(CharSequence word) {
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return super.isValidWord(word);
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}
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private void addWords(Cursor cursor) {
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clearDictionary();
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if (cursor == null) return;
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final int maxWordLength = getMaxWordLength();
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if (cursor.moveToFirst()) {
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final int indexWord = cursor.getColumnIndex(Words.WORD);
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final int indexFrequency = cursor.getColumnIndex(Words.FREQUENCY);
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while (!cursor.isAfterLast()) {
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String word = cursor.getString(indexWord);
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int frequency = cursor.getInt(indexFrequency);
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// Safeguard against adding really long words. Stack may overflow due
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// to recursion
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if (word.length() < maxWordLength) {
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super.addWord(word, frequency);
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}
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cursor.moveToNext();
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}
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}
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}
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}
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