Initial commit

Libraries/StyleSheet/StyleSheetRegistry.js

@@ -0,0 +1,38 @@
+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @providesModule StyleSheetRegistry
+ */
+'use strict';
+
+var styles = {};
+var uniqueID = 1;
+var emptyStyle = {};
+
+class StyleSheetRegistry {
+  static registerStyle(style) {
+    var id = ++uniqueID;
+    if (__DEV__) {
+      Object.freeze(style);
+    }
+    styles[id] = style;
+    return id;
+  }
+
+  static getStyleByID(id) {
+    if (!id) {
+      // Used in the style={[condition && id]} pattern,
+      // we want it to be a no-op when the value is false or null
+      return emptyStyle;
+    }
+
+    var style = styles[id];
+    if (!style) {
+      console.warn('Invalid style with id `' + id + '`. Skipping ...');
+      return emptyStyle;
+    }
+    return style;
+  }
+}
+
+module.exports = StyleSheetRegistry;