Recommendation out of the SDI context.

src/swarm/recommender/Recommender.java

@@ -0,0 +1,131 @@
+package swarm.recommender;
+
+
+import java.net.URISyntaxException;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.ArrayList;
+import java.util.List;
+
+import swarm.core.domain.Breakpoint;
+import swarm.recommender.Candidate;
+import swarm.recommender.CandidateList;
+
+public class Recommender {
+
+	// TODO: Should return the list of entities with their confidence
+	public void recommend() throws URISyntaxException, ClassNotFoundException, SQLException {
+
+		//DB parameters
+		String hostNamePort = "";
+		String dbName = "";
+		String user = "";
+		String pass = "";
+
+		// Connect to the DB
+    	Connection conn = null;
+
+        Class.forName("org.postgresql.Driver");
+
+        String url = "jdbc:postgresql://" + hostNamePort + "/"+ dbName;
+        conn = DriverManager.getConnection(url, user, pass);
+        //  System.out.println("Connected!");
+
+          Statement st = conn.createStatement();
+
+
+          // The breakpoint #223 is used as the current breakpoint i.e., from which to recommend co-breakpoints          
+          int breakpointID = 223;
+          // Query the current task and the program element on which the breakpoint is toggled 
+        //TODO: This must be done when the breakpoint is toggled i.e., BreakpointListener ... when adding breakpoint
+          ResultSet rs = st.executeQuery("SELECT bp.id as bpID, t.id as typeID, t.name as name, tsk.id as taskID "
+          		+ "FROM breakpoint as bp, type as t, session as s, task as tsk "
+          		+ "WHERE bp.id = '" + breakpointID + "' and bp.type_id = t.id and t.session_id = s.id and s.task_id = tsk.id");
+
+          int taskID = 0;
+          int sourceTypeID = 0;
+          String entityName = "";
+
+          while ( rs.next() )
+          {
+        	  sourceTypeID = rs.getInt("typeID");
+              entityName = rs.getString("name");
+              taskID = rs.getInt("taskID");
+
+          }     
+
+      // Query all the tasks (maybe session?) that have breakpoints toggled on this type ID (entityName)
+      // TODO: Exclude the current task if already created in the database
+      ResultSet rsTask = st.executeQuery("SELECT distinct tsk.* FROM type as t, session as s, task as tsk "
+          		+ "WHERE t.name = '"+ entityName + "' and t.session_id = s.id and s.task_id = tsk.id");
+
+
+      List<Integer> tasks = tasksId(rsTask);
+
+
+      List<Breakpoint> breakpointCandidates = new ArrayList<Breakpoint>();
+
+      CandidateList candidates = new CandidateList();
+
+      int support = 0;
+
+      for (int tsk: tasks) {
+
+    	// Query all the breakpoints for these tasks
+          ResultSet rsCandidate = st.executeQuery("SELECT distinct bp.*, t.name FROM breakpoint as bp, type as t, session as s, task as tsk "
+            		+ "WHERE tsk.id = '"+ tsk + "' and tsk.id <>'" + taskID + "'and tsk.id = s.task_id and s.id = t.session_id and t.id = bp.type_id");
+
+
+          List<String> entities = new ArrayList<String>();
+
+          entities = mapCandidate(rsCandidate);
+       // TODO: we should remove the duplicates
+          for (String aCandidate : entities) {    
+
+        	  support++;
+        	  candidates.add(aCandidate);
+          }             
+
+      }
+
+      candidates.rank(support);
+
+      for (Candidate aCandidate : candidates.getCandidates()) {   
+    	  System.out.println(aCandidate.getName() + " : " + aCandidate.getConfidence());
+      }  
+
+      rs.close();
+      st.close();
+
+
+	}
+
+	// Use this only to have task ID
+	static List<Integer> tasksId(ResultSet rs) throws SQLException {
+		List<Integer> tasks = new ArrayList<Integer>();
+
+        while ( rs.next() )
+        {
+        	tasks.add(rs.getInt("id"));
+        }
+
+		return tasks;
+	}
+
+	static List<String> mapCandidate(ResultSet rs) throws SQLException {
+		List<String> entities = new ArrayList<String>();
+
+        while (rs.next() )
+        {
+        	entities.add(rs.getString("name"));
+        }
+
+		return entities;
+	}
+
+}
+