+ login, but only tested for nonexistent users as there is no register yet

src/main/java/de/hsel/itech/db/PaymentDB.java

@@ -45,11 +45,20 @@ public class PaymentDB {
     @NotNull
     public List<Payment> get(@NotNull User user) {
         List<Payment> list = new ArrayList<>();
+        Map.Entry<ResultSet, Connection> entry = database.getResultSetByValue(database.tableUserPayment, "user", user.getId());
+        assert entry != null;
 
-        List<Long> ids = database.getIds(database.tableUserPayment);
-        for(long id : ids) {
-            list.add(get(id));
+        try {
+            ResultSet rs = entry.getKey();
+            while(rs.next()) {
+                list.add(get(rs.getLong("id")));
+            }
+
+            entry.getValue().close();
+        } catch (SQLException e) {
+            e.printStackTrace();
         }
+
         return list;
     }
 
@@ -58,20 +67,16 @@ public class PaymentDB {
         Map.Entry<User, PaymentType> metadata = getMetadata(id);
         assert metadata != null;
 
-        String typeName = metadata.getValue().getName();
-        if(typeName.equals("PayPal")) {
-            return getPayPal(id, metadata.getKey());
+        switch (metadata.getValue().getName()) {
+            case "PayPal":
+                return getPayPal(id, metadata.getKey());
+            case "CreditCard":
+                return getCreditCard(id, metadata.getKey());
+            case "DebitCard":
+                return getDebitCard(id, metadata.getKey());
+            case "Invoice":
+                return getInvoice(id, metadata.getKey());
         }
-        if(typeName.equals("CreditCard")) {
-            return getCreditCard(id, metadata.getKey());
-        }
-        if(typeName.equals("DebitCard")) {
-            return getDebitCard(id, metadata.getKey());
-        }
-        if(typeName.equals("Invoice")) {
-            return getInvoice(id, metadata.getKey());
-        }
-
         return null;
     }
 

src/main/java/de/hsel/itech/db/UserDB.java

@@ -33,13 +33,31 @@ public class UserDB {
 
         ResultSet rs = entry.getKey();
         try {
-            return new User(rs.getString("email"), rs.getString("name"), rs.getString("password"), rs.getShort("type"));
+            User user = null;
+            while(rs.next()) {
+                user =  new User(id, rs.getString("email"), rs.getString("name"), rs.getString("password"), rs.getShort("type"));
+            }
+            entry.getValue().close();
+            return user;
         } catch (SQLException e) {
             e.printStackTrace();
         }
+        return null;
+    }
+
+    @Nullable
+    public User get(String name) {
+        Map.Entry<ResultSet, Connection> entry = database.getResultSetsByValue(database.tableUser, "name", name);
+        assert entry != null;
 
         try {
+            ResultSet rs = entry.getKey();
+            User user = null;
+            while(rs.next()) {
+                user =  new User(rs.getLong("id"), rs.getString("email"), rs.getString("name"), rs.getString("password"), rs.getShort("type"));
+            }
             entry.getValue().close();
+            return user;
         } catch (SQLException e) {
             e.printStackTrace();
         }

src/main/java/de/hsel/itech/jsf/PaymentBean.java

@@ -0,0 +1,23 @@
+package de.hsel.itech.jsf;
+
+import de.hsel.itech.db.Database;
+import de.hsel.itech.db.pojo.Payment;
+import de.hsel.itech.db.pojo.User;
+
+import javax.faces.annotation.ManagedProperty;
+import javax.faces.bean.ManagedBean;
+import javax.faces.bean.SessionScoped;
+import java.util.List;
+
+@ManagedBean
+@SessionScoped
+public class PaymentBean {
+
+    @ManagedProperty("#{userBean.user}")
+    private User user;
+
+    public List<Payment> getMethods() {
+        return Database.getInstance().payment().get(user);
+    }
+
+}

src/main/java/de/hsel/itech/jsf/UserBean.java

@@ -0,0 +1,53 @@
+package de.hsel.itech.jsf;
+
+import de.hsel.itech.db.Database;
+import de.hsel.itech.db.pojo.User;
+import lombok.Getter;
+import lombok.Setter;
+
+import javax.faces.bean.ManagedBean;
+import javax.faces.bean.SessionScoped;
+
+@ManagedBean
+@SessionScoped
+public class UserBean {
+
+    @Getter
+    private User user;
+
+    @Getter
+    @Setter
+    private String username;
+
+    @Getter
+    @Setter
+    private String password;
+
+    @Getter
+    private boolean loggedIn = false;
+
+    @Getter
+    private boolean correctPassword = true;
+
+
+    public String login() {
+        Database db = Database.getInstance();
+        User user = db.user().get(username);
+
+        if (user == null) {
+            correctPassword = false;
+            return "";
+        }
+
+        if (db.user().verify(user, password)) {
+            loggedIn = true;
+            this.user = user;
+            return "index.xhtml";
+        }
+        correctPassword = false;
+        return "";
+
+
+    }
+
+}

src/main/webapp/login.xhtml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml"
+      xmlns:h="http://xmlns.jcp.org/jsf/html"
+      xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
+      xmlns:f="http://xmlns.jcp.org/jsf/core">
+<f:view>
+    <ui:composition template="template.xhtml">
+
+        <ui:define name="content">
+
+            <h:panelGroup layout="block" styleClass="row" rendered="#{not userBean.correctPassword}">
+                <aside class="m-col-s-3 m-push-l-4 m-note m-danger">
+                    <h3>Passwort oder Benutzername falsch</h3>
+                </aside>
+            </h:panelGroup>
+
+            <div class="m-row">
+                <div class="m-col-l-6 m-push-l-4">
+                    <h:form>
+                        <h:inputText id="username" value="#{userBean.username}">Nutzername</h:inputText>
+                        <br/>
+                        <h:inputSecret id="password" value="#{userBean.password}">Passwort</h:inputSecret>
+
+                        <h:commandButton action="#{userBean.login}">Login</h:commandButton>
+                    </h:form>
+                </div>
+            </div>
+
+
+        </ui:define>
+
+    </ui:composition>
+</f:view>
+</html>