2 files changed, 54 insertions, 4 deletions
diff --git a/java/src/com/android/inputmethod/latin/utils/CoordinateUtils.java b/java/src/com/android/inputmethod/latin/utils/CoordinateUtils.java
index 72f2cd2d9..91a63501a 100644
--- a/java/src/com/android/inputmethod/latin/utils/CoordinateUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/CoordinateUtils.java
@@ -16,17 +16,19 @@
 
 package com.android.inputmethod.latin.utils;
 
+import java.util.Arrays;
+
 public final class CoordinateUtils {
     private static final int INDEX_X = 0;
     private static final int INDEX_Y = 1;
-    private static final int ARRAY_SIZE = INDEX_Y + 1;
+    private static final int ELEMENT_SIZE = INDEX_Y + 1;
 
     private CoordinateUtils() {
         // This utility class is not publicly instantiable.
     }
 
     public static int[] newInstance() {
-        return new int[ARRAY_SIZE];
+        return new int[ELEMENT_SIZE];
     }
 
     public static int x(final int[] coords) {
@@ -46,4 +48,39 @@ public final class CoordinateUtils {
         destination[INDEX_X] = source[INDEX_X];
         destination[INDEX_Y] = source[INDEX_Y];
     }
+
+    public static int[] newCoordinateArray(final int arraySize) {
+        return new int[ELEMENT_SIZE * arraySize];
+    }
+
+    public static int xFromArray(final int[] coordsArray, final int index) {
+        return coordsArray[ELEMENT_SIZE * index + INDEX_X];
+    }
+
+    public static int yFromArray(final int[] coordsArray, final int index) {
+        return coordsArray[ELEMENT_SIZE * index + INDEX_Y];
+    }
+
+    public static int[] coordinateFromArray(final int[] coordsArray, final int index) {
+        final int baseIndex = ELEMENT_SIZE * index;
+        return Arrays.copyOfRange(coordsArray, baseIndex, baseIndex + ELEMENT_SIZE);
+    }
+
+    public static void setXYInArray(final int[] coordsArray, final int index,
+            final int x, final int y) {
+        final int baseIndex = ELEMENT_SIZE * index;
+        coordsArray[baseIndex + INDEX_X] = x;
+        coordsArray[baseIndex + INDEX_Y] = y;
+    }
+
+    public static void setCoordinateInArray(final int[] coordsArray, final int index,
+            final int[] coords) {
+        final int baseIndex = ELEMENT_SIZE * index;
+        coordsArray[baseIndex + INDEX_X] = coords[INDEX_X];
+        coordsArray[baseIndex + INDEX_Y] = coords[INDEX_Y];
+    }
+
+    public static void copyArray(final int[] destination, final int[] source) {
+        System.arraycopy(source, 0, destination, 0, source.length);
+    }
 }
diff --git a/java/src/com/android/inputmethod/latin/utils/StringUtils.java b/java/src/com/android/inputmethod/latin/utils/StringUtils.java
index 5920c68f1..6f15b11bf 100644
--- a/java/src/com/android/inputmethod/latin/utils/StringUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/StringUtils.java
@@ -171,13 +171,26 @@ public final class StringUtils {
     private static final int[] EMPTY_CODEPOINTS = {};
 
     public static int[] toCodePointArray(final String string) {
+        return toCodePointArray(string, 0, string.length());
+    }
+
+    /**
+     * Converts a range of a string to an array of code points.
+     * @param string the source string.
+     * @param startIndex the start index inside the string in java chars, inclusive.
+     * @param endIndex the end index inside the string in java chars, exclusive.
+     * @return a new array of code points. At most endIndex - startIndex, but possibly less.
+     */
+    public static int[] toCodePointArray(final String string,
+            final int startIndex, final int endIndex) {
         final int length = string.length();
         if (length <= 0) {
             return EMPTY_CODEPOINTS;
         }
-        final int[] codePoints = new int[string.codePointCount(0, length)];
+        final int[] codePoints = new int[string.codePointCount(startIndex, endIndex)];
         int destIndex = 0;
-        for (int index = 0; index < length; index = string.offsetByCodePoints(index, 1)) {
+        for (int index = startIndex; index < endIndex;
+                index = string.offsetByCodePoints(index, 1)) {
             codePoints[destIndex] = string.codePointAt(index);
             destIndex++;
         }