Checkpoint: added performExchange

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

@@ -47,6 +47,11 @@ public class User {
         return this.studentRegisteredGrups;
     }
 
+    public void removeGroup(Long id) {
+	final Groups groupToDelete = this.studentRegisteredGrups.stream().filter(e -> e.getId().equals(id)).findFirst().get();
+	this.studentRegisteredGrups.remove(groupToDelete);
+    }
+
     public void claimGroup(Groups group) {
         if (this.studentRegisteredGrups == null) {
             this.studentRegisteredGrups = new HashSet<>();
@@ -58,7 +63,7 @@ public class User {
     }
 
     /**
-     * 
+     *
      * @param name    name given to the user
      * @param surname surname given to the user
      * @param mail    mail given to the user
@@ -72,7 +77,7 @@ public class User {
     }
 
     /**
-     * 
+     *
      * @param name    name given to the user
      * @param surname surname given to the user
      * @param mail    mail given to the user
@@ -85,7 +90,7 @@ public class User {
     }
 
     /**
-     * 
+     *
      * @param name    name given to the user
      * @param surname surname given to the user
      * @param mail    mail given to the user
@@ -101,7 +106,7 @@ public class User {
 
     /**
      * usos id getter
-     * 
+     *
      * @return usosid
      */
     public String getUsosId() {
@@ -110,7 +115,7 @@ public class User {
 
     /**
      * email getter
-     * 
+     *
      * @return mailof user
      */
     public String getEmail() {
@@ -119,7 +124,7 @@ public class User {
 
     /**
      * email setter
-     * 
+     *
      * @param email user email
      */
     public void setEmail(String email) {
@@ -128,7 +133,7 @@ public class User {
 
     /**
      * token usage getter
-     * 
+     *
      * @return Timestamp when token was used
      */
     public Timestamp getTokenUsageDate() {
@@ -137,7 +142,7 @@ public class User {
 
     /**
      * token getter
-     * 
+     *
      * @return user token
      */
     public String getToken() {
@@ -153,7 +158,7 @@ public class User {
 
     /**
      * token seter. Sets token and automaticly set time when was set
-     * 
+     *
      * @param token token to set
      */
     public void setToken(String token) {
@@ -164,7 +169,7 @@ public class User {
 
     /**
      * name setter
-     * 
+     *
      * @return String user name
      */
     public String getName() {
@@ -173,7 +178,7 @@ public class User {
 
     /**
      * user rolse getter
-     * 
+     *
      * @return UserRoles of user
      */
     public UserRoles getRole() {
@@ -182,7 +187,7 @@ public class User {
 
     /**
      * user role setter
-     * 
+     *
      * @param role to be set
      */
     public void setRole(UserRoles role) {
@@ -191,7 +196,7 @@ public class User {
 
     /**
      * surname getter
-     * 
+     *
      * @return string surname
      */
     public String getSurname() {
@@ -200,7 +205,7 @@ public class User {
 
     /**
      * surname setter
-     * 
+     *
      * @param surname string to be set as surnames
      */
     public void setSurname(String surname) {
@@ -209,7 +214,7 @@ public class User {
 
     /**
      * name stter
-     * 
+     *
      * @param name stirng to be set as name
      */
     public void setName(String name) {
@@ -218,7 +223,7 @@ public class User {
 
     /**
      * id getter
-     * 
+     *
      * @return id in database
      */
     public Long getId() {
@@ -227,7 +232,7 @@ public class User {
 
     /**
      * Ranking points are [100;500]. It's calculated by gradesAvg*100*studiesYear
-     * 
+     *
      * @return ranking points [100;500]
      */
     public Integer getRanking() {
@@ -237,7 +242,7 @@ public class User {
     /**
      * Ranking points setter. Ranking points are [100;500]. It's calculated by
      * gradesAvg*100*studiesYear
-     * 
+     *
      * @param ranking ranking points [100;500]
      */
     public void setRanking(Integer ranking) {
@@ -246,7 +251,7 @@ public class User {
 
     /**
      * updates user entity with data got by UsosApiService::getUserData
-     * 
+     *
      * @param usosData UserApiResponse model with needed data
      */
     public void updateWithUsosData(UserApiResponse usosData) {
@@ -257,7 +262,7 @@ public class User {
     /**
      * it checks if given ammount of time passed since last token usage. If not
      * retunr true and reset time otherwise return false and token won work anymore
-     * 
+     *
      * @return boolena if credentials (token) is expired or not
      */
     public boolean isCredentialsNonExpired() {