Adjust the used frequency of the user dictionary words. (c79493a1) · Commits · e / os / android_packages_inputmethods_LatinIME

java/src/com/android/inputmethod/latin/UserBinaryDictionary.java

+20 −5

Original line number	Diff line number	Diff line
		@@ -31,14 +31,15 @@ import android.text.TextUtils;
		import java.util.Arrays;

		/**
		* An expandable dictionary that stores the words in the user unigram dictionary.
		*
		* Largely a copy of UserDictionary, will replace that class in the future.
		* An expandable dictionary that stores the words in the user dictionary provider into a binary
		* dictionary file to use it from native code.
		*/
		public class UserBinaryDictionary extends ExpandableBinaryDictionary {

		// The user dictionary provider uses an empty string to mean "all languages".
		private static final String USER_DICTIONARY_ALL_LANGUAGES = "";
		private static final int HISTORICAL_DEFAULT_USER_DICTIONARY_FREQUENCY = 250;
		private static final int LATINIME_DEFAULT_USER_DICTIONARY_FREQUENCY = 160;

		// TODO: use Words.SHORTCUT when we target JellyBean or above
		final static String SHORTCUT = "shortcut";
		@@ -233,6 +234,19 @@ public class UserBinaryDictionary extends ExpandableBinaryDictionary {
		mContext.startActivity(intent);
		}

		private int scaleFrequencyFromDefaultToLatinIme(final int defaultFrequency) {
		// The default frequency for the user dictionary is 250 for historical reasons.
		// Latin IME considers a good value for the default user dictionary frequency
		// is about 160 considering the scale we use. So we are scaling down the values.
		if (defaultFrequency > Integer.MAX_VALUE / LATINIME_DEFAULT_USER_DICTIONARY_FREQUENCY) {
		return (defaultFrequency / HISTORICAL_DEFAULT_USER_DICTIONARY_FREQUENCY)
		* LATINIME_DEFAULT_USER_DICTIONARY_FREQUENCY;
		} else {
		return (defaultFrequency * LATINIME_DEFAULT_USER_DICTIONARY_FREQUENCY)
		/ HISTORICAL_DEFAULT_USER_DICTIONARY_FREQUENCY;
		}
		}

		private void addWords(final Cursor cursor) {
		final boolean hasShortcutColumn = Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN;
		clearFusionDictionary();
		@@ -245,12 +259,13 @@ public class UserBinaryDictionary extends ExpandableBinaryDictionary {
		final String word = cursor.getString(indexWord);
		final String shortcut = hasShortcutColumn ? cursor.getString(indexShortcut) : null;
		final int frequency = cursor.getInt(indexFrequency);
		final int adjustedFrequency = scaleFrequencyFromDefaultToLatinIme(frequency);
		// Safeguard against adding really long words.
		if (word.length() < MAX_WORD_LENGTH) {
		super.addWord(word, null, frequency);
		super.addWord(word, null, adjustedFrequency);
		}
		if (null != shortcut && shortcut.length() < MAX_WORD_LENGTH) {
		super.addWord(shortcut, word, frequency);
		super.addWord(shortcut, word, adjustedFrequency);
		}
		cursor.moveToNext();
		}