+ if (immutableModifications == null) {
+ immutableModifications = Collections.unmodifiableList(modifications);
+ }
+
+ return immutableModifications;
+ }
+
+ @Override
+ public void readExternal(final ObjectInput in) throws IOException, ClassNotFoundException {
+ super.readExternal(in);
+ final int size = in.readInt();
+ if (size > 0) {
+ if (getVersion() >= DataStoreVersions.PHOSPHORUS_VERSION) {
+ readExternalModern(NormalizedNodeDataInput.newDataInput(in), size);
+ } else {
+ readExternalLegacy(in, size);
+ }
+ }
+ }
+
+ @Override
+ public void writeExternal(final ObjectOutput out) throws IOException {
+ super.writeExternal(out);
+ final int size = modifications.size();
+ out.writeInt(size);
+ if (size > 0) {
+ if (getVersion() >= DataStoreVersions.PHOSPHORUS_VERSION) {
+ writeExternalModern(out);
+ } else {
+ writeExternalLegacy(out);
+ }
+ }
+ }
+
+ private void readExternalLegacy(final ObjectInput in, final int size) throws IOException {
+ final NormalizedNodeDataInput input = NormalizedNodeDataInput.newDataInputWithoutValidation(in);
+ final ReusableStreamReceiver receiver = ReusableImmutableNormalizedNodeStreamWriter.create();
+ for (int i = 0; i < size; i++) {
+ final byte type = in.readByte();
+ switch (type) {
+ case Modification.WRITE:
+ modifications.add(WriteModification.fromStream(input, getVersion(), receiver));
+ break;
+ case Modification.MERGE:
+ modifications.add(MergeModification.fromStream(input, getVersion(), receiver));
+ break;
+ case Modification.DELETE:
+ modifications.add(DeleteModification.fromStream(input, getVersion()));
+ break;
+ default:
+ break;
+ }
+ }
+ }
+
+ private void writeExternalLegacy(final ObjectOutput out) throws IOException {
+ try (NormalizedNodeDataOutput stream = getStreamVersion().newDataOutput(out)) {
+ for (Modification mod : modifications) {
+ out.writeByte(mod.getType());
+ mod.writeTo(stream);
+ }
+ }
+ }
+
+ private void readExternalModern(final NormalizedNodeDataInput in, final int size) throws IOException {
+ final ReusableStreamReceiver receiver = ReusableImmutableNormalizedNodeStreamWriter.create();
+ for (int i = 0; i < size; i++) {
+ final byte type = in.readByte();
+ switch (type) {
+ case Modification.WRITE:
+ modifications.add(WriteModification.fromStream(in, getVersion(), receiver));
+ break;
+ case Modification.MERGE:
+ modifications.add(MergeModification.fromStream(in, getVersion(), receiver));
+ break;
+ case Modification.DELETE:
+ modifications.add(DeleteModification.fromStream(in, getVersion()));
+ break;
+ default:
+ break;
+ }
+ }
+ }
+
+ private void writeExternalModern(final ObjectOutput out) throws IOException {
+ try (NormalizedNodeDataOutput stream = getStreamVersion().newDataOutput(out)) {
+ for (Modification mod : modifications) {
+ stream.writeByte(mod.getType());
+ mod.writeTo(stream);
+ }
+ }
+ }
+
+ public static MutableCompositeModification fromSerializable(final Object serializable) {
+ checkArgument(serializable instanceof MutableCompositeModification);
+ return (MutableCompositeModification)serializable;
+ }
+
+ @Override
+ public void writeTo(final NormalizedNodeDataOutput out) throws IOException {
+ throw new UnsupportedOperationException();