X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=datadb%2Fcompbio%2Fcassandra%2Freaders%2FCassandraReader.java;h=a4561be889833600ef42cbbf2bfc194b538924df;hb=5aec34fb583587602104757aaadc13e7a32ca75c;hp=f9706595d479aa51e60342b4e7ec0c6cffa94d58;hpb=189cef1556fdfed2d73f16d197e7d590417cb881;p=proteocache.git

diff --git a/datadb/compbio/cassandra/readers/CassandraReader.java b/datadb/compbio/cassandra/readers/CassandraReader.java
index f970659..a4561be 100644
--- 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
 	 *