Merge pull request #9 from jkff/cte-loglog

CountThenEstimate supports LogLog

Author: cburroughs

src/main/java/com/clearspring/analytics/stream/cardinality/CountThenEstimate.java

@@ -47,7 +47,8 @@ public class CountThenEstimate implements ICardinality, Externalizable
     protected final static byte LC = 1;
     protected final static byte AC = 2;
 	protected final static byte HLC = 3;
-    
+	protected final static byte LLC = 4;
+
     /**
      * Cardinality after which exact counting gives way to estimation
      */
@@ -224,6 +225,9 @@ public void readExternal(ObjectInput in) throws IOException, ClassNotFoundExcept
 			case HLC:
 				estimator = HyperLogLog.Builder.build(bytes);
 				break;
+            case LLC:
+                estimator = new LinearCounting(bytes);
+                break;
             default:
                 throw new IOException("Unrecognized estimator type: "+type);
             }
@@ -262,6 +266,10 @@ else if(estimator instanceof HyperLogLog)
 			{
 				out.writeByte(HLC);
 			}
+			else if(estimator instanceof LogLog)
+			{
+				out.writeByte(LLC);
+			}
             else throw new IOException("Estimator unsupported for serialization: "+estimator.getClass().getName());
 
             byte[] bytes = estimator.getBytes();