Created @Interpolate annotation for Interpolators to know which fields to interpolate (instead of all public fields)

src/main/java/eu/crushedpixel/replaymod/holders/Point.java

@@ -1,5 +1,6 @@
 package eu.crushedpixel.replaymod.holders;
 
+import eu.crushedpixel.replaymod.interpolation.Interpolate;
 import eu.crushedpixel.replaymod.interpolation.KeyframeValue;
 import lombok.AllArgsConstructor;
 import lombok.NoArgsConstructor;
@@ -8,6 +9,7 @@ import lombok.NoArgsConstructor;
 @NoArgsConstructor
 public class Point extends KeyframeValue {
 
+    @Interpolate
     public double x, y;
 
 }

src/main/java/eu/crushedpixel/replaymod/holders/Position.java

@@ -1,5 +1,6 @@
 package eu.crushedpixel.replaymod.holders;
 
+import eu.crushedpixel.replaymod.interpolation.Interpolate;
 import eu.crushedpixel.replaymod.interpolation.KeyframeValue;
 import lombok.AllArgsConstructor;
 import lombok.Data;
@@ -14,7 +15,9 @@ import net.minecraft.entity.Entity;
 @EqualsAndHashCode(callSuper=true)
 public class Position extends KeyframeValue {
 
+    @Interpolate
     public double x, y, z;
+    @Interpolate
     public double pitch, yaw, roll;
 
     private Integer spectatedEntityID;

src/main/java/eu/crushedpixel/replaymod/holders/TimestampValue.java

@@ -1,5 +1,6 @@
 package eu.crushedpixel.replaymod.holders;
 
+import eu.crushedpixel.replaymod.interpolation.Interpolate;
 import eu.crushedpixel.replaymod.interpolation.KeyframeValue;
 import lombok.AllArgsConstructor;
 import lombok.NoArgsConstructor;
@@ -8,6 +9,7 @@ import lombok.NoArgsConstructor;
 @NoArgsConstructor
 public class TimestampValue extends KeyframeValue {
 
+    @Interpolate
     public double value;
 
 }

src/main/java/eu/crushedpixel/replaymod/interpolation/GenericLinearInterpolation.java

@@ -1,7 +1,6 @@
 package eu.crushedpixel.replaymod.interpolation;
 
 import java.lang.reflect.Field;
-import java.lang.reflect.Modifier;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -23,7 +22,7 @@ public class GenericLinearInterpolation<T extends KeyframeValue> implements Inte
 
         List<Field> fields = new ArrayList<Field>();
         for(Field f : point.getClass().getDeclaredFields()) {
-            if(Modifier.isPublic(f.getModifiers())) {
+            if(f.isAnnotationPresent(Interpolate.class)) {
                 fields.add(f);
             }
         }

src/main/java/eu/crushedpixel/replaymod/interpolation/GenericSplineInterpolation.java

@@ -1,7 +1,6 @@
 package eu.crushedpixel.replaymod.interpolation;
 
 import java.lang.reflect.Field;
-import java.lang.reflect.Modifier;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Vector;
@@ -22,7 +21,7 @@ public class GenericSplineInterpolation<T extends KeyframeValue> extends BasicSp
 
         List<Field> fields = new ArrayList<Field>();
         for(Field f : point.getClass().getDeclaredFields()) {
-            if(Modifier.isPublic(f.getModifiers())) {
+            if(f.isAnnotationPresent(Interpolate.class)) {
                 fields.add(f);
             }
         }

src/main/java/eu/crushedpixel/replaymod/interpolation/Interpolate.java

@@ -0,0 +1,13 @@
+package eu.crushedpixel.replaymod.interpolation;
+
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.FIELD)
+public @interface Interpolate {
+
+}

src/main/java/eu/crushedpixel/replaymod/interpolation/KeyframeValue.java

@@ -2,7 +2,7 @@ package eu.crushedpixel.replaymod.interpolation;
 
 /**
  * An abstract class that GenericSplineInterpolation can process.
- * Subclasses simply have to declare at least one <b>public</b> double field,
+ * Subclasses simply have to annotate at least one field with @Interpolate,
  * and the GenericSplineInterpolation will interpolate these.
  * <br><br>
  * It is recommended for KeyframeValue subclasses to have a @NoArgsConstructor annotation.