Add mode comments to the classes

[proteocache.git] / datadb / compbio / cassandra / readers / CassandraReader.java

diff --git a/datadb/compbio/cassandra/readers/CassandraReader.java b/datadb/compbio/cassandra/readers/CassandraReader.java
index f970659..a4561be 100644 (file)
--- a/datadb/compbio/cassandra/readers/CassandraReader.java
+++ b/datadb/compbio/cassandra/readers/CassandraReader.java
@@ -9,11 +9,22 @@ import com.datastax.driver.core.exceptions.QueryValidationException;
 
 import compbio.cassandra.CassandraNativeConnector;
 
+/**
+ * basic reader of the ProteoCache database. It depends on open
+ * CassandraNativeConnector, which should provide an open session to the
+ * ProteoCache DB (in the default constructor)
+ * 
+ * @author as373024
+ *
+ */
 public class CassandraReader {
        protected static long earlestDate = 0;
        protected Session session;
        protected static Logger log = Logger.getLogger(CassandraNativeConnector.class);
 
+       /**
+        * default constructor.
+        */
        public CassandraReader() {
                Session inis = CassandraNativeConnector.getSession();
                setSession(inis);
@@ -24,6 +35,13 @@ public class CassandraReader {
                session = s;
        }
 
+       /**
+        * Basic query to the DB. The method throws exception if the input command
+        * is not valid or if there is a problem with execution of the command
+        * 
+        * @param command - reading CQL command
+        * @return resulting outout of the command
+        */
        protected ResultSet CassandraQuery(String command) {
                try {
                        ResultSet results = session.execute(command);
@@ -44,14 +62,16 @@ public class CassandraReader {
 
        }
 
-       /*
-        * find the earliest date in the database
+       /**
+        * finds the earliest date in the database
+        * 
+        * @return the earliest date (long)
         */
        public static long earliestDate() {
                earlestDate = CassandraNativeConnector.getEarliestDateInDB();
                return earlestDate;
        }
-       
+
        /**
         * prepares an example of either job id or IP for the DB
         *