Add YogaNode.cloneWithoutChildren

Summary: Adding flat clone method back to YogaNode for reconciliation.

Reviewed By: davidaurelio

Differential Revision: D14683019

fbshipit-source-id: 08ed2ffbb16052cb11aa464f67a7ba9a64297985

java/com/facebook/yoga/YogaNative.java

@@ -111,4 +111,5 @@ public class YogaNative {
   static native void jni_YGNodeSetHasBaselineFunc(long nativePointer, boolean hasMeasureFunc);
   static native void jni_YGNodePrint(long nativePointer);
   static native void jni_YGNodeSetStyleInputs(long nativePointer, float[] styleInputsArray, int size);
+  static native long jni_YGNodeClone(long nativePointer);
 }

java/com/facebook/yoga/YogaNode.java

@@ -221,4 +221,6 @@ public abstract class YogaNode {
   public abstract void print();
 
   public abstract void setStyleInputs(float[] styleInputs, int size);
+
+  public abstract YogaNode cloneWithoutChildren();
 }

java/com/facebook/yoga/YogaNodeJNIBase.java

@@ -12,7 +12,7 @@ import java.util.List;
 import javax.annotation.Nullable;
 
 @DoNotStrip
-public abstract class YogaNodeJNIBase extends YogaNode {
+public abstract class YogaNodeJNIBase extends YogaNode implements Cloneable {
 
   @Nullable private YogaNodeJNIBase mOwner;
   @Nullable private List<YogaNodeJNIBase> mChildren;
@@ -93,6 +93,21 @@ public abstract class YogaNodeJNIBase extends YogaNode {
     return YogaNative.jni_YGNodeIsReferenceBaseline(mNativePointer);
   }
 
+  @Override
+  public YogaNodeJNIBase cloneWithoutChildren() {
+    try {
+      YogaNodeJNIBase clonedYogaNode = (YogaNodeJNIBase) super.clone();
+      long clonedNativePointer = YogaNative.jni_YGNodeClone(mNativePointer);
+      clonedYogaNode.mOwner = null;
+      clonedYogaNode.mNativePointer = clonedNativePointer;
+      clonedYogaNode.clearChildren();
+      return clonedYogaNode;
+    } catch (CloneNotSupportedException ex) {
+      // This class implements Cloneable, this should not happen
+      throw new RuntimeException(ex);
+    }
+  }
+
   private void clearChildren() {
     mChildren = null;
     YogaNative.jni_YGNodeClearChildren(mNativePointer);