version2/src/java/iotcloud/KeyValue.java

   1 package iotcloud;
   2 import java.nio.ByteBuffer;
   3
   4 /**
   5  * KeyValue entry for Slot.
   6  * @author Brian Demsky <bdemsky@uci.edu>
   7  * @version 1.0
   8  */
   9
  10 class KeyValue { /*extends Entry */
  11         private IoTString key;
  12         private IoTString value;
  13
  14         public KeyValue(IoTString _key, IoTString _value) {
  15                 key = _key;
  16                 value = _value;
  17         }
  18
  19         public IoTString getKey() {
  20                 return key;
  21         }
  22
  23         public IoTString getValue() {
  24                 return value;
  25         }
  26
  27         static KeyValue decode(ByteBuffer bb) {
  28                 int keylength = bb.getInt();
  29                 int valuelength = bb.getInt();
  30                 byte[] key = new byte[keylength];
  31                 bb.get(key);
  32
  33                 if (valuelength != 0) {
  34                         byte[] value = new byte[valuelength];
  35                         bb.get(value);
  36                         return new KeyValue(IoTString.shallow(key), IoTString.shallow(value));
  37                 }
  38
  39                 return new KeyValue(IoTString.shallow(key), null);
  40         }
  41
  42         public void encode(ByteBuffer bb) {
  43                 bb.putInt(key.length());
  44
  45                 if (value != null) {
  46                         bb.putInt(value.length());
  47                 } else {
  48                         bb.putInt(0);
  49                 }
  50
  51                 bb.put(key.internalBytes());
  52
  53                 if (value != null) {
  54                         bb.put(value.internalBytes());
  55                 }
  56         }
  57
  58         public int getSize() {
  59                 if (value != null) {
  60                         return 2 * Integer.BYTES + key.length() + value.length();
  61                 }
  62
  63                 return 2 * Integer.BYTES + key.length();
  64         }
  65
  66         public String toString() {
  67                 if (value == null) {
  68                         return "null";
  69                 }
  70                 return value.toString();
  71         }
  72
  73         public KeyValue getCopy() {
  74                 return new KeyValue(key, value);
  75         }
  76 }