Less Catalyst, more React

Summary:
Catalyst is the old project name. Rename a few files.

public

Reviewed By: bestander

Differential Revision: D2859553

fb-gh-sync-id: 65a87cc7bcc22f20326971becec02aa1c573e5b9

ReactAndroid/src/main/java/com/facebook/react/uimanager/ReactStylesDiffMap.java

@@ -0,0 +1,89 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.uimanager;
+
+import javax.annotation.Nullable;
+
+import android.view.View;
+
+import com.facebook.react.bridge.ReadableArray;
+import com.facebook.react.bridge.ReadableMap;
+
+/**
+ * Wrapper for {@link ReadableMap} which should be used for styles property map. It extends
+ * some of the accessor methods of {@link ReadableMap} by adding a default value property
+ * such that caller is enforced to provide a default value for a style property.
+ *
+ * Instances of this class are used to update {@link View} or {@link CSSNode} style properties.
+ * Since properties are generated by React framework based on what has been updated each value
+ * in this map should either be interpreted as a new value set for a style property or as a "reset
+ * this property to default" command in case when value is null (this is a way React communicates
+ * change in which the style key that was previously present in a map has been removed).
+ *
+ * NOTE: Accessor method with default value will throw an exception when the key is not present in
+ * the map. Style applicator logic should verify whether the key exists in the map using
+ * {@link #hasKey} before fetching the value. The motivation behind this is that in case when the
+ * updated style diff map doesn't contain a certain style key it means that the corresponding view
+ * property shouldn't be updated (whereas in all other cases it should be updated to the new value
+ * or the property should be reset).
+ */
+public class ReactStylesDiffMap {
+
+  /* package */ final ReadableMap mBackingMap;
+
+  public ReactStylesDiffMap(ReadableMap props) {
+    mBackingMap = props;
+  }
+
+  public boolean hasKey(String name) {
+    return mBackingMap.hasKey(name);
+  }
+
+  public boolean isNull(String name) {
+    return mBackingMap.isNull(name);
+  }
+
+  public boolean getBoolean(String name, boolean restoreNullToDefaultValue) {
+    return mBackingMap.isNull(name) ? restoreNullToDefaultValue : mBackingMap.getBoolean(name);
+  }
+
+  public double getDouble(String name, double restoreNullToDefaultValue) {
+    return mBackingMap.isNull(name) ? restoreNullToDefaultValue : mBackingMap.getDouble(name);
+  }
+
+  public float getFloat(String name, float restoreNullToDefaultValue) {
+    return mBackingMap.isNull(name) ?
+        restoreNullToDefaultValue : (float) mBackingMap.getDouble(name);
+  }
+
+  public int getInt(String name, int restoreNullToDefaultValue) {
+    return mBackingMap.isNull(name) ? restoreNullToDefaultValue : mBackingMap.getInt(name);
+  }
+
+  @Nullable
+  public String getString(String name) {
+    return mBackingMap.getString(name);
+  }
+
+  @Nullable
+  public ReadableArray getArray(String key) {
+    return mBackingMap.getArray(key);
+  }
+
+  @Nullable
+  public ReadableMap getMap(String key) {
+    return mBackingMap.getMap(key);
+  }
+
+  @Override
+  public String toString() {
+    return "{ " + getClass().getSimpleName() + ": " + mBackingMap.toString() + " }";
+  }
+}