generic errors

service/src/main/java/com/telephoners/krakyournet/ctf/exceptions/ElementAlreadyExistsException.java

 package com.telephoners.krakyournet.ctf.exceptions;
 
-import com.telephoners.krakyournet.ctf.beans.User;
+import org.ektorp.support.CouchDbDocument;
 
 import javax.ws.rs.WebApplicationException;
 import javax.ws.rs.core.Response;
 
 public class ElementAlreadyExistsException extends WebApplicationException
 {
-    public ElementAlreadyExistsException(final Class<User> elementName)
+    public ElementAlreadyExistsException(final Class<? extends CouchDbDocument> elementName)
     {
         super(Response.status(Response.Status.BAD_REQUEST)
                 .entity(String.format("Element %s already exists", elementName.getSimpleName()))

service/src/main/java/com/telephoners/krakyournet/ctf/exceptions/ElementDoesNotExistException.java

 package com.telephoners.krakyournet.ctf.exceptions;
 
-import com.telephoners.krakyournet.ctf.beans.Team;
+import org.ektorp.support.CouchDbDocument;
 
 import javax.ws.rs.WebApplicationException;
 import javax.ws.rs.core.Response;
 
 public class ElementDoesNotExistException extends WebApplicationException
 {
-    public ElementDoesNotExistException(final Class<Team> elementName)
+    public ElementDoesNotExistException(final Class<? extends CouchDbDocument> elementName)
     {
         super(Response.status(Response.Status.NOT_FOUND)
                 .entity(String.format("Element %s does not exist", elementName.getSimpleName()))

service/src/main/java/com/telephoners/krakyournet/ctf/repositories/TeamRepository.java

+package com.telephoners.krakyournet.ctf.repositories;
+
+import com.google.inject.Inject;
+import com.telephoners.krakyournet.ctf.beans.Team;
+import com.telephoners.krakyournet.ctf.core.DataConnector;
+
+public class TeamRepository extends Repository<Team>
+{
+    @Inject
+    public TeamRepository(final Class<Team> type, final DataConnector<Team> connector)
+    {
+        super(type, connector);
+    }
+
+    //todo: this should be handled by driver itself
+    //todo: merge with User
+    public boolean exists(final String teamName)
+    {
+        return getAll()
+                .stream()
+                .anyMatch(team -> team.getName().equals(teamName));
+    }
+}

service/src/main/java/com/telephoners/krakyournet/ctf/resources/RegistrationResource.java

@@ -4,7 +4,7 @@ import com.telephoners.krakyournet.ctf.beans.Team;
 import com.telephoners.krakyournet.ctf.beans.User;
 import com.telephoners.krakyournet.ctf.exceptions.ElementAlreadyExistsException;
 import com.telephoners.krakyournet.ctf.exceptions.ElementDoesNotExistException;
-import com.telephoners.krakyournet.ctf.repositories.Repository;
+import com.telephoners.krakyournet.ctf.repositories.TeamRepository;
 import com.telephoners.krakyournet.ctf.repositories.UserRepository;
 
 import javax.inject.Inject;
@@ -20,12 +20,12 @@ import javax.ws.rs.core.MediaType;
 @Produces(MediaType.APPLICATION_JSON)
 public class RegistrationResource
 {
-    private final Repository<Team> teamsRepository;
+    private final TeamRepository teamsRepository;
     private final UserRepository userRepository;
 
     @Inject
     public RegistrationResource(final UserRepository userRepository,
-                                final Repository<Team> teamsRepository)
+                                final TeamRepository teamsRepository)
     {
         //todo: checkNotNUll
         this.teamsRepository = teamsRepository;
@@ -36,7 +36,8 @@ public class RegistrationResource
     @Path("/team")
     public String registerTeam(@QueryParam("teamName") final String teamName)
     {
-        //todo: check if exists
+        validateTeamName(teamName);
+
         Team team = new Team();
         team.setName(teamName);
         team.setDescription("descr");
@@ -64,6 +65,11 @@ public class RegistrationResource
         return user.getId();
     }
 
+    private void validateTeamName(final String teamName)
+    {
+        if(teamsRepository.exists(teamName)) throw new ElementAlreadyExistsException(Team.class);
+    }
+
     private void validateTeam(final String teamId)
     {
         if(teamsRepository.contains(teamId)) throw new ElementDoesNotExistException(Team.class);