Removed unused imports and added javadocs.

Author: chrfrantz

src/main/java/org/nlogo/extensions/dbscan/DBSCANExtension.java

@@ -78,7 +78,7 @@ public Object report(Argument[] args, Context ctx)
 
 			// Convert input agentset to collection
 			Collection<Agent> inputCollection = new ArrayList<>();
-			Iterator it = inputValues.agents().iterator();
+			Iterator<?> it = inputValues.agents().iterator();
 			while (it.hasNext()) {
 				inputCollection.add((Agent) it.next());
 			}
@@ -147,7 +147,7 @@ public Object report(Argument[] args, Context ctx)
 
 			// Convert input agentset to collection
 			Collection<Turtle> inputCollection = new ArrayList<>();
-			Iterator it = inputValues.agents().iterator();
+			Iterator<?> it = inputValues.agents().iterator();
 			while (it.hasNext()) {
 				inputCollection.add((Turtle) it.next());
 			}

src/main/java/org/nlogo/extensions/dbscan/metrics/DistanceMetricNetLogoAgents.java

@@ -5,6 +5,12 @@
 import org.nlogo.agent.Agent;
 import org.nlogo.api.AgentException;
 
+/**
+ * Distance metric implementation for agent variables.
+ * 
+ * @author Christopher Frantz <[email protected]>
+ *
+ */
 public class DistanceMetricNetLogoAgents implements DistanceMetric<Agent>{
 
 	private String field = null;

src/main/java/org/nlogo/extensions/dbscan/metrics/DistanceMetricNetLogoLocation.java

@@ -2,10 +2,14 @@
 
 import org.christopherfrantz.dbscan.DBSCANClusteringException;
 import org.christopherfrantz.dbscan.DistanceMetric;
-import org.nlogo.agent.Agent;
 import org.nlogo.agent.Turtle;
-import org.nlogo.api.AgentException;
 
+/**
+ * Distance metric implementation for locations.
+ * 
+ * @author Christopher Frantz <[email protected]>
+ *
+ */
 public class DistanceMetricNetLogoLocation implements DistanceMetric<Turtle>{
 
 	private static final String X_COORDINATE = "XCOR";

src/main/java/org/nlogo/extensions/dbscan/metrics/DistanceMetricNetLogoTurtles.java

@@ -5,6 +5,13 @@
 import org.nlogo.agent.Turtle;
 import org.nlogo.api.AgentException;
 
+/**
+ * Distance metric implementation for agent variables for agents of type turtle.
+ * This extension is used for unit tests.
+ * 
+ * @author Christopher Frantz <[email protected]>
+ *
+ */
 public class DistanceMetricNetLogoTurtles implements DistanceMetric<Turtle>{
 
 	private String field = null;