Checkpoints: Part 1 of Added docs

Signed-off-by: Marcin Woźniak <y0rune@aol.com>

buisnesslogic/src/main/java/com/plannaplan/entities/Assignment.java

@@ -47,6 +47,14 @@ public class Assignment {
         return this.group.getRegisteredStudents().contains(this.commision.getCommisionOwner());
     }
 
+    /** 
+     * Getter of commision
+     * @return Commision Commision of given assignments
+     */
+    public Commision getCommision(){
+        return this.commision;
+    }
+
     /**
      * Assignment
      * 

buisnesslogic/src/main/java/com/plannaplan/entities/Exchange.java

@@ -7,6 +7,9 @@ import javax.persistence.Id;
 import javax.persistence.JoinColumn;
 import javax.persistence.OneToOne;
 
+/**
+ *  Entity that keeps user exchange offer. 
+ */
 @Entity
 public class Exchange {
 
@@ -14,10 +17,6 @@ public class Exchange {
     @GeneratedValue(strategy = GenerationType.AUTO)
     private Long id;
 
-    @OneToOne
-    @JoinColumn(name = "trader_id")
-    private User trader;
-
     @OneToOne
     @JoinColumn(name = "owned_id")
     private Assignment ownedAssignment;
@@ -30,38 +29,48 @@ public class Exchange {
 
     }
 
-    public Exchange(User trader, Assignment ownedAssignment, Groups desiredAssignment){
-        this.trader = trader;
+    public Exchange(Assignment ownedAssignment, Groups desiredAssignment){
         this.ownedAssignment = ownedAssignment;
         this.desiredAssignment = desiredAssignment;
     }
 
+    
+    /** 
+     * @return Long ID in database
+     */
     public Long getId(){
         return this.id;
     }
 
+    
+    /** 
+     * @return Groups Target group
+     */
     public Groups getDesiredAssignment() {
         return desiredAssignment;
     }
 
+    
+    /** 
+     * @param desiredAssignment Target group
+     */
     public void setDesiredAssignment(Groups desiredAssignment) {
         this.desiredAssignment = desiredAssignment;
     }
 
+    
+    /** 
+     * @return Assignment Owned assignment
+     */
     public Assignment getOwnedAssignment() {
         return ownedAssignment;
     }
 
+    
+    /** 
+     * @param ownedAssignment Owned assignment
+     */
     public void setOwnedAssignment(Assignment ownedAssignment) {
         this.ownedAssignment = ownedAssignment;
     }
-
-    public User getTrader() {
-        return trader;
-    }
-
-    public void setTrader(User trader) {
-        this.trader = trader;
-    }
-
-}
+}

buisnesslogic/src/main/java/com/plannaplan/services/ExchangeService.java

@@ -12,6 +12,10 @@ public class ExchangeService {
     @Autowired
     private ExchangeRepository repo;
 
+    /** 
+     * @param exchange Instance to save in database
+     * @return Exchange Instance contains database id
+     */
     public Exchange save(Exchange exchange){
         return this.repo.save(exchange);
     }