conversions between PipelineOps and RPC schema

runtime/src/main/java/org/capnproto/PipelineOp.java

@@ -22,4 +22,39 @@ final class PipelineOp {
     static PipelineOp PointerField(short pointerIndex) {
         return new PipelineOp(Type.GET_POINTER_FIELD, pointerIndex);
     }
+
+    static void FromPipelineOps(PipelineOp[] ops, RpcProtocol.PromisedAnswer.Builder builder) {
+        var transforms = builder.initTransform(ops.length);
+        for (int ii = 0; ii < ops.length; ++ii) {
+            switch (ops[ii].type) {
+                case NOOP:
+                    transforms.get(ii).setNoop(null);
+                    break;
+                case GET_POINTER_FIELD:
+                    transforms.get(ii).setGetPointerField(ops[ii].pointerIndex);
+                    break;
+            }
+        }
+    }
+
+    static PipelineOp[] ToPipelineOps(RpcProtocol.PromisedAnswer.Reader reader) {
+        var transforms = reader.getTransform();
+        var ops = new PipelineOp[transforms.size()];
+        for (int ii = 0; ii < ops.length; ++ii) {
+            var transform = transforms.get(ii);
+            switch (transform.which()) {
+                case NOOP:
+                    ops[ii] = Noop();
+                    break;
+                case GET_POINTER_FIELD:
+                    ops[ii] = PointerField(transform.getGetPointerField());
+                    break;
+                default:
+                    // TODO improve error handling here
+                    // Unsupported pipeline ops
+                    return null;
+            }
+        }
+        return ops;
+    }
 }