2009-03-13 22:11:42 +00:00
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/*
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2010-03-26 22:07:10 +00:00
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* Copyright (C) 2008 The Android Open Source Project
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2009-03-13 22:11:42 +00:00
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.android.inputmethod.latin;
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/**
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* Abstract base class for a dictionary that can do a fuzzy search for words based on a set of key
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* strokes.
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*/
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2010-12-10 06:24:28 +00:00
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public abstract class Dictionary {
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2009-03-13 22:11:42 +00:00
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/**
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* Whether or not to replicate the typed word in the suggested list, even if it's valid.
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*/
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protected static final boolean INCLUDE_TYPED_WORD_IF_VALID = false;
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/**
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* The weight to give to a word if it's length is the same as the number of typed characters.
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*/
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2011-03-15 18:46:32 +00:00
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protected static final int FULL_WORD_SCORE_MULTIPLIER = 2;
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2010-07-01 03:28:04 +00:00
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public static enum DataType {
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UNIGRAM, BIGRAM
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}
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2009-03-13 22:11:42 +00:00
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/**
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* Interface to be implemented by classes requesting words to be fetched from the dictionary.
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* @see #getWords(WordComposer, WordCallback)
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*/
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public interface WordCallback {
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/**
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* Adds a word to a list of suggestions. The word is expected to be ordered based on
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2011-03-15 18:46:32 +00:00
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* the provided score.
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2009-03-13 22:11:42 +00:00
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* @param word the character array containing the word
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* @param wordOffset starting offset of the word in the character array
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* @param wordLength length of valid characters in the character array
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2011-03-15 18:46:32 +00:00
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* @param score the score of occurrence. This is normalized between 1 and 255, but
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2009-03-13 22:11:42 +00:00
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* can exceed those limits
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2010-06-02 09:30:27 +00:00
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* @param dicTypeId of the dictionary where word was from
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2010-07-01 03:28:04 +00:00
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* @param dataType tells type of this data
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2009-03-13 22:11:42 +00:00
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* @return true if the word was added, false if no more words are required
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*/
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2011-03-15 18:46:32 +00:00
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boolean addWord(char[] word, int wordOffset, int wordLength, int score, int dicTypeId,
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2010-07-01 03:28:04 +00:00
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DataType dataType);
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2009-03-13 22:11:42 +00:00
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}
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/**
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* Searches for words in the dictionary that match the characters in the composer. Matched
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* words are added through the callback object.
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* @param composer the key sequence to match
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* @param callback the callback object to send matched words to as possible candidates
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2011-04-26 07:28:56 +00:00
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* @see WordCallback#addWord(char[], int, int, int, int, DataType)
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2009-03-13 22:11:42 +00:00
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*/
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2011-02-10 11:53:58 +00:00
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abstract public void getWords(final WordComposer composer, final WordCallback callback);
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2009-03-13 22:11:42 +00:00
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2010-07-01 03:28:04 +00:00
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/**
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* Searches for pairs in the bigram dictionary that matches the previous word and all the
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* possible words following are added through the callback object.
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* @param composer the key sequence to match
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2010-12-10 06:24:28 +00:00
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* @param previousWord the word before
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2010-07-01 03:28:04 +00:00
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* @param callback the callback object to send possible word following previous word
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*/
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public void getBigrams(final WordComposer composer, final CharSequence previousWord,
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2011-02-10 11:53:58 +00:00
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final WordCallback callback) {
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2010-07-01 03:28:04 +00:00
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// empty base implementation
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}
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2009-03-13 22:11:42 +00:00
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/**
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* Checks if the given word occurs in the dictionary
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* @param word the word to search for. The search should be case-insensitive.
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* @return true if the word exists, false otherwise
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*/
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abstract public boolean isValidWord(CharSequence word);
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/**
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* Compares the contents of the character array with the typed word and returns true if they
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* are the same.
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* @param word the array of characters that make up the word
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* @param length the number of valid characters in the character array
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* @param typedWord the word to compare with
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* @return true if they are the same, false otherwise.
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*/
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protected boolean same(final char[] word, final int length, final CharSequence typedWord) {
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if (typedWord.length() != length) {
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return false;
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}
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for (int i = 0; i < length; i++) {
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if (word[i] != typedWord.charAt(i)) {
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return false;
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}
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}
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return true;
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}
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2009-10-12 20:48:35 +00:00
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/**
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* Override to clean up any resources.
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*/
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public void close() {
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2010-12-10 06:24:28 +00:00
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// empty base implementation
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2009-10-12 20:48:35 +00:00
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}
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2009-03-13 22:11:42 +00:00
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}
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