Add a method to update contextual dictionary.

Bug: 14161647
Change-Id: I2111f841c94e31d62b670da4236fc738df03a708

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

@@ -351,6 +351,11 @@ public class DictionaryFacilitator {
         mDistracterFilter.close();
     }
 
+    @UsedForTesting
+    public ExpandableBinaryDictionary getSubDictForTesting(final String dictName) {
+        return mDictionaries.getSubDict(dictName);
+    }
+
     // The main dictionary could have been loaded asynchronously.  Don't cache the return value
     // of this method.
     public boolean hasInitializedMainDictionary() {
@@ -607,6 +612,41 @@ public class DictionaryFacilitator {
         personalizationDict.addMultipleDictionaryEntriesDynamically(languageModelParams, callback);
     }
 
+    public void addPhraseToContextualDictionary(final String[] phrase, final int probability,
+            final int bigramProbabilityForWords, final int bigramProbabilityForPhrases) {
+        final ExpandableBinaryDictionary contextualDict =
+                mDictionaries.getSubDict(Dictionary.TYPE_CONTEXTUAL);
+        if (contextualDict == null) {
+            return;
+        }
+        PrevWordsInfo prevWordsInfo = PrevWordsInfo.BEGINNING_OF_SENTENCE;
+        for (int i = 0; i < phrase.length; i++) {
+            if (i < phrase.length - 1) {
+                final String[] subPhrase =
+                        Arrays.copyOfRange(phrase, i /* start */, phrase.length);
+                final String subPhraseStr = TextUtils.join(Constants.WORD_SEPARATOR, subPhrase);
+                contextualDict.addUnigramEntryWithCheckingDistracter(
+                        subPhraseStr, probability, null /* shortcutTarget */,
+                        Dictionary.NOT_A_PROBABILITY /* shortcutFreq */,
+                        false /* isNotAWord */, false /* isBlacklisted */,
+                        BinaryDictionary.NOT_A_VALID_TIMESTAMP,
+                        DistracterFilter.EMPTY_DISTRACTER_FILTER);
+                contextualDict.addNgramEntry(prevWordsInfo, subPhraseStr,
+                        bigramProbabilityForPhrases, BinaryDictionary.NOT_A_VALID_TIMESTAMP);
+
+            }
+            contextualDict.addUnigramEntryWithCheckingDistracter(
+                    phrase[i], probability, null /* shortcutTarget */,
+                    Dictionary.NOT_A_PROBABILITY /* shortcutFreq */,
+                    false /* isNotAWord */, false /* isBlacklisted */,
+                    BinaryDictionary.NOT_A_VALID_TIMESTAMP,
+                    DistracterFilter.EMPTY_DISTRACTER_FILTER);
+            contextualDict.addNgramEntry(prevWordsInfo, phrase[i],
+                    bigramProbabilityForWords, BinaryDictionary.NOT_A_VALID_TIMESTAMP);
+            prevWordsInfo = new PrevWordsInfo(phrase[i]);
+        }
+    }
+
     public void dumpDictionaryForDebug(final String dictName) {
         final ExpandableBinaryDictionary dictToDump = mDictionaries.getSubDict(dictName);
         if (dictToDump == null) {

tests/src/com/android/inputmethod/latin/personalization/ContextualDictionaryTests.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2014 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.personalization;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+
+import com.android.inputmethod.latin.Dictionary;
+import com.android.inputmethod.latin.DictionaryFacilitator;
+import com.android.inputmethod.latin.ExpandableBinaryDictionary;
+
+import android.test.AndroidTestCase;
+import android.test.suitebuilder.annotation.LargeTest;
+
+/**
+ * Unit tests for contextual dictionary
+ */
+@LargeTest
+public class ContextualDictionaryTests extends AndroidTestCase {
+    private static final String TAG = ContextualDictionaryTests.class.getSimpleName();
+
+    private static final Locale LOCALE_EN_US = new Locale("en", "US");
+
+    private DictionaryFacilitator getDictionaryFacilitator() {
+        final ArrayList<String> dictTypes = new ArrayList<>();
+        dictTypes.add(Dictionary.TYPE_CONTEXTUAL);
+        final DictionaryFacilitator dictionaryFacilitator = new DictionaryFacilitator();
+        dictionaryFacilitator.resetDictionariesForTesting(getContext(), LOCALE_EN_US, dictTypes,
+                new HashMap<String, File>(), new HashMap<String, Map<String, String>>());
+        return dictionaryFacilitator;
+    }
+
+    public void testAddPhrase() {
+        final DictionaryFacilitator dictionaryFacilitator = getDictionaryFacilitator();
+        final String[] phrase = new String[] {"a", "b", "c", "d"};
+        final int probability = 100;
+        final int bigramProbabilityForWords = 150;
+        final int bigramProbabilityForPhrases = 200;
+        dictionaryFacilitator.addPhraseToContextualDictionary(
+                phrase, probability, bigramProbabilityForWords, bigramProbabilityForPhrases);
+        final ExpandableBinaryDictionary contextualDictionary =
+                dictionaryFacilitator.getSubDictForTesting(Dictionary.TYPE_CONTEXTUAL);
+        contextualDictionary.waitAllTasksForTests();
+        // Word
+        assertTrue(contextualDictionary.isInDictionary("a"));
+        assertTrue(contextualDictionary.isInDictionary("b"));
+        assertTrue(contextualDictionary.isInDictionary("c"));
+        assertTrue(contextualDictionary.isInDictionary("d"));
+        // Phrase
+        assertTrue(contextualDictionary.isInDictionary("a b c d"));
+        assertTrue(contextualDictionary.isInDictionary("b c d"));
+        assertTrue(contextualDictionary.isInDictionary("c d"));
+        assertFalse(contextualDictionary.isInDictionary("a b c"));
+        assertFalse(contextualDictionary.isInDictionary("abcd"));
+        // TODO: Add tests for probability.
+        // TODO: Add tests for n-grams.
+    }
+}