Add jni method for removeUnigramEntry().

Bug: 15552347
Change-Id: Iadcdc73d3335d561a27b9314d3fcdab0b0c96e49

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

@@ -207,6 +207,7 @@ public final class BinaryDictionary extends Dictionary {
     private static native boolean addUnigramWordNative(long dict, int[] word, int probability,
             int[] shortcutTarget, int shortcutProbability, boolean isBeginningOfSentence,
             boolean isNotAWord, boolean isBlacklisted, int timestamp);
+    private static native boolean removeUnigramWordNative(long dict, int[] word);
     private static native boolean addBigramWordsNative(long dict, int[] word0,
             boolean isBeginningOfSentence, int[] word1, int probability, int timestamp);
     private static native boolean removeBigramWordsNative(long dict, int[] word0,
@@ -443,6 +444,19 @@ public final class BinaryDictionary extends Dictionary {
         return true;
     }
 
+    // Remove a unigram entry from the binary dictionary in native code.
+    public boolean removeUnigramEntry(final String word) {
+        if (TextUtils.isEmpty(word)) {
+            return false;
+        }
+        final int[] codePoints = StringUtils.toCodePointArray(word);
+        if (!removeUnigramWordNative(mNativeDict, codePoints)) {
+            return false;
+        }
+        mHasUpdated = true;
+        return true;
+    }
+
     // Add an n-gram entry to the binary dictionary with timestamp in native code.
     public boolean addNgramEntry(final PrevWordsInfo prevWordsInfo, final String word,
             final int probability, final int timestamp) {

native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp

@@ -357,6 +357,18 @@ static bool latinime_BinaryDictionary_addUnigramWord(JNIEnv *env, jclass clazz,
     return dictionary->addUnigramEntry(codePoints, codePointCount, &unigramProperty);
 }
 
+static bool latinime_BinaryDictionary_removeUnigramWord(JNIEnv *env, jclass clazz, jlong dict,
+        jintArray word) {
+    Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);
+    if (!dictionary) {
+        return false;
+    }
+    jsize codePointCount = env->GetArrayLength(word);
+    int codePoints[codePointCount];
+    env->GetIntArrayRegion(word, 0, codePointCount, codePoints);
+    return dictionary->removeUnigramEntry(codePoints, codePointCount);
+}
+
 static bool latinime_BinaryDictionary_addBigramWords(JNIEnv *env, jclass clazz, jlong dict,
         jintArray word0, jboolean isBeginningOfSentence, jintArray word1, jint probability,
         jint timestamp) {
@@ -669,6 +681,11 @@ static const JNINativeMethod sMethods[] = {
         const_cast<char *>("(J[II[IIZZZI)Z"),
         reinterpret_cast<void *>(latinime_BinaryDictionary_addUnigramWord)
     },
+    {
+        const_cast<char *>("removeUnigramWordNative"),
+        const_cast<char *>("(J[I)Z"),
+        reinterpret_cast<void *>(latinime_BinaryDictionary_removeUnigramWord)
+    },
     {
         const_cast<char *>("addBigramWordsNative"),
         const_cast<char *>("(J[IZ[III)Z"),