Added Android App

[iotcloud.git] / version2 / src / Control / app / src / main / java / iotcloud / SlotIndexer.java

diff --git a/version2/src/Control/app/src/main/java/iotcloud/SlotIndexer.java b/version2/src/Control/app/src/main/java/iotcloud/SlotIndexer.java
new file mode 100644 (file)
index 0000000..cecdf2d
--- /dev/null
+++ b/version2/src/Control/app/src/main/java/iotcloud/SlotIndexer.java
@@ -0,0 +1,31 @@
+package iotcloud;
+
+/**
+ * Slot indexer allows slots in both the slot buffer and the new
+ * server response to looked up in a consistent fashion.
+ * @author Brian Demsky
+ * @version 1.0
+ */
+
+class SlotIndexer {
+       private Slot[] updates;
+       private SlotBuffer buffer;
+       private long firstslotseqnum;
+
+       SlotIndexer(Slot[] _updates, SlotBuffer _buffer) {
+               buffer = _buffer;
+               updates = _updates;
+               firstslotseqnum = updates[0].getSequenceNumber();
+       }
+
+       Slot getSlot(long seqnum) {
+               if (seqnum >= firstslotseqnum) {
+                       int offset = (int) (seqnum - firstslotseqnum);
+                       if (offset >= updates.length)
+                               throw new Error("Invalid Slot Sequence Number Reference");
+                       else
+                               return updates[offset];
+               } else
+                       return buffer.getSlot(seqnum);
+       }
+}