Split YogaConfig into interface and actual implementation

Summary:
Split YogaConfig into the same way YogaNode is split today.

Into an abstract class defining the interface, and actual JNI implementation

Reviewed By: SidharthGuglani

Differential Revision: D17266404

fbshipit-source-id: 3d5d6aa65c55cfa61d47c662d140cdce6dcb0ea1

java/com/facebook/yoga/YogaConfig.java

@@ -6,78 +6,35 @@
  */
 package com.facebook.yoga;
 
-import com.facebook.soloader.SoLoader;
-
-public class YogaConfig {
+public abstract class YogaConfig {
 
   public static int SPACING_TYPE = 1;
 
-  private long mNativePointer;
-  private YogaLogger mLogger;
-  private YogaNodeCloneFunction mYogaNodeCloneFunction;
+  public abstract void setExperimentalFeatureEnabled(YogaExperimentalFeature feature, boolean enabled);
 
-  public YogaConfig() {
-    mNativePointer = YogaNative.jni_YGConfigNew();
-    if (mNativePointer == 0) {
-      throw new IllegalStateException("Failed to allocate native memory");
-    }
-  }
+  public abstract void setUseWebDefaults(boolean useWebDefaults);
 
-  @Override
-  protected void finalize() throws Throwable {
-    try {
-      YogaNative.jni_YGConfigFree(mNativePointer);
-    } finally {
-      super.finalize();
-    }
-  }
-
-  public void setExperimentalFeatureEnabled(YogaExperimentalFeature feature, boolean enabled) {
-    YogaNative.jni_YGConfigSetExperimentalFeatureEnabled(mNativePointer, feature.intValue(), enabled);
-  }
-
-  public void setUseWebDefaults(boolean useWebDefaults) {
-    YogaNative.jni_YGConfigSetUseWebDefaults(mNativePointer, useWebDefaults);
-  }
-
-  public void setPrintTreeFlag(boolean enable) {
-    YogaNative.jni_YGConfigSetPrintTreeFlag(mNativePointer, enable);
-  }
-
-  public void setPointScaleFactor(float pixelsInPoint) {
-    YogaNative.jni_YGConfigSetPointScaleFactor(mNativePointer, pixelsInPoint);
-  }
+  public abstract void setPrintTreeFlag(boolean enable);
 
+  public abstract void setPointScaleFactor(float pixelsInPoint);
   /**
    * Yoga previously had an error where containers would take the maximum space possible instead of the minimum
    * like they are supposed to. In practice this resulted in implicit behaviour similar to align-self: stretch;
    * Because this was such a long-standing bug we must allow legacy users to switch back to this behaviour.
    */
-  public void setUseLegacyStretchBehaviour(boolean useLegacyStretchBehaviour) {
-    YogaNative.jni_YGConfigSetUseLegacyStretchBehaviour(mNativePointer, useLegacyStretchBehaviour);
-  }
+  public abstract void setUseLegacyStretchBehaviour(boolean useLegacyStretchBehaviour);
 
   /**
    * If this flag is set then yoga would diff the layout without legacy flag and would set a bool in
    * YogaNode(mDoesLegacyStretchFlagAffectsLayout) with true if the layouts were different and false
    * if not
    */
-  public void setShouldDiffLayoutWithoutLegacyStretchBehaviour(
-      boolean shouldDiffLayoutWithoutLegacyStretchBehaviour) {
-    YogaNative.jni_YGConfigSetShouldDiffLayoutWithoutLegacyStretchBehaviour(
-        mNativePointer, shouldDiffLayoutWithoutLegacyStretchBehaviour);
-  }
+  public abstract void setShouldDiffLayoutWithoutLegacyStretchBehaviour(
+      boolean shouldDiffLayoutWithoutLegacyStretchBehaviour);
 
-  public void setLogger(YogaLogger logger) {
-    mLogger = logger;
-    YogaNative.jni_YGConfigSetLogger(mNativePointer, logger);
-  }
+  public abstract void setLogger(YogaLogger logger);
 
-  public YogaLogger getLogger() {
-    return mLogger;
-  }
+  public abstract YogaLogger getLogger();
 
-  long getNativePointer() {
-    return mNativePointer;
-  }
+  abstract long getNativePointer();
 }

java/com/facebook/yoga/YogaConfigFactory.java

@@ -2,6 +2,6 @@ package com.facebook.yoga;
 
 public abstract class YogaConfigFactory {
   public static YogaConfig create() {
-    return new YogaConfig();
+    return new YogaConfigJNIFinalizer();
   }
 }

java/com/facebook/yoga/YogaConfigJNIBase.java

@@ -0,0 +1,76 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ */
+package com.facebook.yoga;
+
+import com.facebook.soloader.SoLoader;
+
+public abstract class YogaConfigJNIBase extends YogaConfig {
+
+  protected long mNativePointer;
+  private YogaLogger mLogger;
+  private YogaNodeCloneFunction mYogaNodeCloneFunction;
+
+  private YogaConfigJNIBase(long nativePointer) {
+    if (nativePointer == 0) {
+      throw new IllegalStateException("Failed to allocate native memory");
+    }
+    mNativePointer = nativePointer;
+  }
+
+  YogaConfigJNIBase() {
+    this(YogaNative.jni_YGConfigNew());
+  }
+
+  public void setExperimentalFeatureEnabled(YogaExperimentalFeature feature, boolean enabled) {
+    YogaNative.jni_YGConfigSetExperimentalFeatureEnabled(mNativePointer, feature.intValue(), enabled);
+  }
+
+  public void setUseWebDefaults(boolean useWebDefaults) {
+    YogaNative.jni_YGConfigSetUseWebDefaults(mNativePointer, useWebDefaults);
+  }
+
+  public void setPrintTreeFlag(boolean enable) {
+    YogaNative.jni_YGConfigSetPrintTreeFlag(mNativePointer, enable);
+  }
+
+  public void setPointScaleFactor(float pixelsInPoint) {
+    YogaNative.jni_YGConfigSetPointScaleFactor(mNativePointer, pixelsInPoint);
+  }
+
+  /**
+   * Yoga previously had an error where containers would take the maximum space possible instead of the minimum
+   * like they are supposed to. In practice this resulted in implicit behaviour similar to align-self: stretch;
+   * Because this was such a long-standing bug we must allow legacy users to switch back to this behaviour.
+   */
+  public void setUseLegacyStretchBehaviour(boolean useLegacyStretchBehaviour) {
+    YogaNative.jni_YGConfigSetUseLegacyStretchBehaviour(mNativePointer, useLegacyStretchBehaviour);
+  }
+
+  /**
+   * If this flag is set then yoga would diff the layout without legacy flag and would set a bool in
+   * YogaNode(mDoesLegacyStretchFlagAffectsLayout) with true if the layouts were different and false
+   * if not
+   */
+  public void setShouldDiffLayoutWithoutLegacyStretchBehaviour(
+      boolean shouldDiffLayoutWithoutLegacyStretchBehaviour) {
+    YogaNative.jni_YGConfigSetShouldDiffLayoutWithoutLegacyStretchBehaviour(
+        mNativePointer, shouldDiffLayoutWithoutLegacyStretchBehaviour);
+  }
+
+  public void setLogger(YogaLogger logger) {
+    mLogger = logger;
+    YogaNative.jni_YGConfigSetLogger(mNativePointer, logger);
+  }
+
+  public YogaLogger getLogger() {
+    return mLogger;
+  }
+
+  long getNativePointer() {
+    return mNativePointer;
+  }
+}

java/com/facebook/yoga/YogaConfigJNIFinalizer.java

@@ -0,0 +1,30 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ */
+package com.facebook.yoga;
+
+public class YogaConfigJNIFinalizer extends YogaConfigJNIBase {
+  public YogaConfigJNIFinalizer() {
+    super();
+  }
+
+  @Override
+  protected void finalize() throws Throwable {
+    try {
+      freeNatives();
+    } finally {
+      super.finalize();
+    }
+   }
+
+  public void freeNatives() {
+    if (mNativePointer != 0) {
+      long nativePointer = mNativePointer;
+      mNativePointer = 0;
+      YogaNative.jni_YGConfigFree(nativePointer);
+    }
+  }
+}