add the RVec3Arg interface

src/main/java/com/github/stephengold/joltjni/BodyCreationSettings.java

@@ -40,7 +40,7 @@ public class BodyCreationSettings extends JoltPhysicsObject {
      * @param objLayer the ID of the desired object layer
      */
     public BodyCreationSettings(Shape shape,
-            RVec3 loc, Quat orient, EMotionType motionType, int objLayer) {
+            RVec3Arg loc, Quat orient, EMotionType motionType, int objLayer) {
         long shapeVa = shape.va();
         int motionTypeOrdinal = motionType.ordinal();
         long bodySettingsVa = createBodyCreationSettingsFromShape(
@@ -60,7 +60,7 @@ public BodyCreationSettings(Shape shape,
      * @param objLayer the ID of the desired object layer
      */
     public BodyCreationSettings(ShapeSettings shapeSettings,
-            RVec3 loc, Quat orient, EMotionType motionType, int objLayer) {
+            RVec3Arg loc, Quat orient, EMotionType motionType, int objLayer) {
         long shapeSettingsVa = shapeSettings.va();
         int motionTypeOrdinal = motionType.ordinal();
         long bodySettingsVa = createBodyCreationSettingsFromShapeSettings(

src/main/java/com/github/stephengold/joltjni/RVec3.java

@@ -27,7 +27,7 @@ of this software and associated documentation files (the "Software"), to deal
  *
  * @author Stephen Gold [email protected]
  */
-final public class RVec3 {
+final public class RVec3 implements RVec3Arg {
     // *************************************************************************
     // fields
 
@@ -70,12 +70,28 @@ public RVec3(double x, double y, double z) {
     // *************************************************************************
     // new methods exposed
 
+    /**
+     * Set all 3 components to specified values.
+     *
+     * @param x the desired X component
+     * @param y the desired Y component
+     * @param z the desired Z component
+     */
+    public void set(double x, double y, double z) {
+        this.xx = x;
+        this.yy = y;
+        this.zz = z;
+    }
+    // *************************************************************************
+    // RVec3Arg methods
+
     /**
      * Return the first (X) component at positional precision. The vector is
      * unaffected.
      *
      * @return the component value
      */
+    @Override
     public Object getX() {
         Object result;
         if (Jolt.isDoublePrecision()) {
@@ -93,6 +109,7 @@ public Object getX() {
      *
      * @return the component value
      */
+    @Override
     public Object getY() {
         Object result;
         if (Jolt.isDoublePrecision()) {
@@ -110,6 +127,7 @@ public Object getY() {
      *
      * @return the component value
      */
+    @Override
     public Object getZ() {
         Object result;
         if (Jolt.isDoublePrecision()) {
@@ -121,25 +139,13 @@ public Object getZ() {
         return result;
     }
 
-    /**
-     * Set all 3 components to specified values.
-     *
-     * @param x the desired X component
-     * @param y the desired Y component
-     * @param z the desired Z component
-     */
-    public void set(double x, double y, double z) {
-        this.xx = x;
-        this.yy = y;
-        this.zz = z;
-    }
-
     /**
      * Return the first (X) component in single precision. The vector is
      * unaffected.
      *
      * @return the component value
      */
+    @Override
     public float x() {
         return (float) xx;
     }
@@ -150,6 +156,7 @@ public float x() {
      *
      * @return the component value
      */
+    @Override
     public double xx() {
         return xx;
     }
@@ -160,6 +167,7 @@ public double xx() {
      *
      * @return the component value
      */
+    @Override
     public float y() {
         return (float) yy;
     }
@@ -170,6 +178,7 @@ public float y() {
      *
      * @return the component value
      */
+    @Override
     public double yy() {
         return yy;
     }
@@ -180,6 +189,7 @@ public double yy() {
      *
      * @return the component value
      */
+    @Override
     public float z() {
         return (float) zz;
     }
@@ -190,6 +200,7 @@ public float z() {
      *
      * @return the component value
      */
+    @Override
     public double zz() {
         return zz;
     }

src/main/java/com/github/stephengold/joltjni/RVec3Arg.java

@@ -0,0 +1,104 @@
+/*
+Copyright (c) 2024 Stephen Gold
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+ */
+package com.github.stephengold.joltjni;
+
+/**
+ * A read-only interface to {@code RVec3} instances.
+ *
+ * @author Stephen Gold [email protected]
+ */
+public interface RVec3Arg {
+    // *************************************************************************
+    // new methods exposed
+
+    /**
+     * Return the first (X) component at positional precision. The vector is
+     * unaffected.
+     *
+     * @return the component value
+     */
+    Object getX();
+
+    /**
+     * Return the 2nd (Y) component at positional precision. The vector is
+     * unaffected.
+     *
+     * @return the component value
+     */
+    Object getY();
+
+    /**
+     * Return the 3rd (Z) component at positional precision. The vector is
+     * unaffected.
+     *
+     * @return the component value
+     */
+    Object getZ();
+
+    /**
+     * Return the first (X) component in single precision. The vector is
+     * unaffected.
+     *
+     * @return the component value
+     */
+    float x();
+
+    /**
+     * Return the first (X) component in double precision. The vector is
+     * unaffected.
+     *
+     * @return the component value
+     */
+    double xx();
+
+    /**
+     * Return the 2nd (Y) component in single precision. The vector is
+     * unaffected.
+     *
+     * @return the component value
+     */
+    float y();
+
+    /**
+     * Return the 2nd (Y) component in double precision. The vector is
+     * unaffected.
+     *
+     * @return the component value
+     */
+    double yy();
+
+    /**
+     * Return the 3rd (Z) component in single precision. The vector is
+     * unaffected.
+     *
+     * @return the component value
+     */
+    float z();
+
+    /**
+     * Return the 3rd (Z) component in double precision. The vector is
+     * unaffected.
+     *
+     * @return the component value
+     */
+    double zz();
+}