add SCAN, HSCAN, SSCAN and ZSCAN

src/main/java/redis/clients/jedis/ScanParams.java

@@ -0,0 +1,29 @@
+package redis.clients.jedis;
+
+import static redis.clients.jedis.Protocol.Keyword.COUNT;
+import static redis.clients.jedis.Protocol.Keyword.MATCH;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+import redis.clients.util.SafeEncoder;
+
+public class ScanParams {
+    private List<byte[]> params = new ArrayList<byte[]>();
+
+    public void match(final String pattern) {
+	params.add(MATCH.raw);
+	params.add(SafeEncoder.encode(pattern));
+    }
+
+    public void count(final int count) {
+	params.add(COUNT.raw);
+	params.add(Protocol.toByteArray(count));
+    }
+
+    public Collection<byte[]> getParams() {
+	return Collections.unmodifiableCollection(params);
+    }
+}