Clean up KeyboardLayoutSet a bit

This CL moves getScriptId() from KeyboardLayoutSet.Builder to
KeyboardLayoutSet.

Change-Id: I13588467e3d03abb92120acb367f021ee3490a50

java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java

@@ -52,6 +52,9 @@ import java.io.IOException;
 import java.lang.ref.SoftReference;
 import java.util.HashMap;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
 /**
  * This class represents a set of keyboard layouts. Each of them represents a different keyboard
  * specific to a keyboard state, such as alphabet, symbols, and so on.  Layouts in the same
@@ -83,6 +86,8 @@ public final class KeyboardLayoutSet {
     private static final HashMap<KeyboardId, SoftReference<Keyboard>> sKeyboardCache =
             new HashMap<>();
     private static final KeysCache sKeysCache = new KeysCache();
+    private final static HashMap<InputMethodSubtype, Integer> sScriptIdsForSubtypes =
+            new HashMap<>();
 
     @SuppressWarnings("serial")
     public static final class KeyboardLayoutSetException extends RuntimeException {
@@ -141,6 +146,16 @@ public final class KeyboardLayoutSet {
         sKeysCache.clear();
     }
 
+    public static int getScriptId(final Resources resources, final InputMethodSubtype subtype) {
+        final Integer value = sScriptIdsForSubtypes.get(subtype);
+        if (null == value) {
+            final int scriptId = Builder.readScriptId(resources, subtype);
+            sScriptIdsForSubtypes.put(subtype, scriptId);
+            return scriptId;
+        }
+        return value;
+    }
+
     KeyboardLayoutSet(final Context context, final Params params) {
         mContext = context;
         mParams = params;
@@ -245,7 +260,7 @@ public final class KeyboardLayoutSet {
 
         private static final EditorInfo EMPTY_EDITOR_INFO = new EditorInfo();
 
-        public Builder(final Context context, final EditorInfo ei) {
+        public Builder(final Context context, @Nullable final EditorInfo ei) {
             mContext = context;
             mPackageName = context.getPackageName();
             mResources = context.getResources();
@@ -266,7 +281,7 @@ public final class KeyboardLayoutSet {
             return this;
         }
 
-        public Builder setSubtype(final RichInputMethodSubtype subtype) {
+        public Builder setSubtype(@Nonnull final RichInputMethodSubtype subtype) {
             final boolean asciiCapable = InputMethodSubtypeCompatUtils.isAsciiCapable(subtype);
             // TODO: Consolidate with {@link InputAttributes}.
             @SuppressWarnings("deprecation")
@@ -304,31 +319,13 @@ public final class KeyboardLayoutSet {
             return this;
         }
 
-        public Builder setScriptId(final int scriptId) {
-            mParams.mScriptId = scriptId;
-            return this;
-        }
-
         public Builder setSplitLayoutEnabledByUser(final boolean enabled) {
             mParams.mIsSplitLayoutEnabledByUser = enabled;
             return this;
         }
 
-        private final static HashMap<InputMethodSubtype, Integer> sScriptIdsForSubtypes =
-                new HashMap<>();
-        public static int getScriptId(final Resources resources, final InputMethodSubtype subtype) {
-            final Integer value = sScriptIdsForSubtypes.get(subtype);
-            if (null == value) {
-                final int scriptId = readScriptId(resources, subtype);
-                sScriptIdsForSubtypes.put(subtype, scriptId);
-                return scriptId;
-            }
-            return value;
-        }
-
         // Super redux version of reading the script ID for some subtype from Xml.
-        private static int readScriptId(final Resources resources,
-                final InputMethodSubtype subtype) {
+        static int readScriptId(final Resources resources, final InputMethodSubtype subtype) {
             final String layoutSetName = KEYBOARD_LAYOUT_SET_RESOURCE_PREFIX
                     + SubtypeLocaleUtils.getKeyboardLayoutSetName(subtype);
             final int xmlId = getXmlId(resources, layoutSetName);
@@ -415,7 +412,7 @@ public final class KeyboardLayoutSet {
                     if (TAG_ELEMENT.equals(tag)) {
                         parseKeyboardLayoutSetElement(parser);
                     } else if (TAG_FEATURE.equals(tag)) {
-                        parseKeyboardLayoutSetFeature(parser);
+                        mParams.mScriptId = readScriptIdFromTagFeature(mResources, parser);
                     } else {
                         throw new XmlParseUtils.IllegalStartTag(parser, tag, TAG_KEYBOARD_SET);
                     }
@@ -460,12 +457,6 @@ public final class KeyboardLayoutSet {
             }
         }
 
-        private void parseKeyboardLayoutSetFeature(final XmlPullParser parser)
-                throws XmlPullParserException, IOException {
-            final int scriptId = readScriptIdFromTagFeature(mResources, parser);
-            setScriptId(scriptId);
-        }
-
         private static int getKeyboardMode(final EditorInfo editorInfo) {
             final int inputType = editorInfo.inputType;
             final int variation = inputType & InputType.TYPE_MASK_VARIATION;