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/*
* Copyright (C) 2011 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 com.android.inputmethod.keyboard.ProximityInfo;
import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
import android.util.Log;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* Class for a collection of dictionaries that behave like one dictionary.
*/
public class DictionaryCollection extends Dictionary {
private final String TAG = DictionaryCollection.class.getSimpleName();
protected final CopyOnWriteArrayList<Dictionary> mDictionaries;
public DictionaryCollection(final String dictType) {
super(dictType);
mDictionaries = new CopyOnWriteArrayList<Dictionary>();
}
public DictionaryCollection(final String dictType, Dictionary... dictionaries) {
super(dictType);
if (null == dictionaries) {
mDictionaries = new CopyOnWriteArrayList<Dictionary>();
} else {
mDictionaries = new CopyOnWriteArrayList<Dictionary>(dictionaries);
mDictionaries.removeAll(Collections.singleton(null));
}
}
public DictionaryCollection(final String dictType, Collection<Dictionary> dictionaries) {
super(dictType);
mDictionaries = new CopyOnWriteArrayList<Dictionary>(dictionaries);
mDictionaries.removeAll(Collections.singleton(null));
}
@Override
public ArrayList<SuggestedWordInfo> getWords(final WordComposer composer,
final CharSequence prevWordForBigrams, final ProximityInfo proximityInfo) {
final CopyOnWriteArrayList<Dictionary> dictionaries = mDictionaries;
if (dictionaries.isEmpty()) return null;
// To avoid creating unnecessary objects, we get the list out of the first
// dictionary and add the rest to it if not null, hence the get(0)
ArrayList<SuggestedWordInfo> suggestions = dictionaries.get(0).getWords(composer,
prevWordForBigrams, proximityInfo);
if (null == suggestions) suggestions = new ArrayList<SuggestedWordInfo>();
final int length = dictionaries.size();
for (int i = 0; i < length; ++ i) {
final ArrayList<SuggestedWordInfo> sugg = dictionaries.get(i).getWords(composer,
prevWordForBigrams, proximityInfo);
if (null != sugg) suggestions.addAll(sugg);
}
return suggestions;
}
@Override
public ArrayList<SuggestedWordInfo> getBigrams(final WordComposer composer,
final CharSequence previousWord) {
final CopyOnWriteArrayList<Dictionary> dictionaries = mDictionaries;
if (dictionaries.isEmpty()) return null;
// To avoid creating unnecessary objects, we get the list out of the first
// dictionary and add the rest to it if not null, hence the get(0)
ArrayList<SuggestedWordInfo> suggestions = dictionaries.get(0).getBigrams(composer,
previousWord);
if (null == suggestions) suggestions = new ArrayList<SuggestedWordInfo>();
final int length = dictionaries.size();
for (int i = 0; i < length; ++ i) {
final ArrayList<SuggestedWordInfo> sugg =
dictionaries.get(i).getBigrams(composer, previousWord);
if (null != sugg) suggestions.addAll(sugg);
}
return suggestions;
}
@Override
public boolean isValidWord(CharSequence word) {
for (int i = mDictionaries.size() - 1; i >= 0; --i)
if (mDictionaries.get(i).isValidWord(word)) return true;
return false;
}
@Override
public int getFrequency(CharSequence word) {
int maxFreq = -1;
for (int i = mDictionaries.size() - 1; i >= 0; --i) {
final int tempFreq = mDictionaries.get(i).getFrequency(word);
if (tempFreq >= maxFreq) {
maxFreq = tempFreq;
}
}
return maxFreq;
}
@Override
public boolean isInitialized() {
return !mDictionaries.isEmpty();
}
@Override
public void close() {
for (final Dictionary dict : mDictionaries)
dict.close();
}
// Warning: this is not thread-safe. Take necessary precaution when calling.
public void addDictionary(final Dictionary newDict) {
if (null == newDict) return;
if (mDictionaries.contains(newDict)) {
Log.w(TAG, "This collection already contains this dictionary: " + newDict);
}
mDictionaries.add(newDict);
}
// Warning: this is not thread-safe. Take necessary precaution when calling.
public void removeDictionary(final Dictionary dict) {
if (mDictionaries.contains(dict)) {
mDictionaries.remove(dict);
} else {
Log.w(TAG, "This collection does not contain this dictionary: " + dict);
}
}
}
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