created Class TaskListModel

src/main/java/ch/zhaw/gartenverwaltung/taskList/TaskListModel.java

@@ -0,0 +1,64 @@
+package ch.zhaw.gartenverwaltung.taskList;
+
+import ch.zhaw.gartenverwaltung.io.JsonTaskDatabase;
+import ch.zhaw.gartenverwaltung.io.TaskDatabase;
+import ch.zhaw.gartenverwaltung.types.Task;
+
+import java.io.IOException;
+import java.time.LocalDate;
+import java.util.Comparator;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class TaskListModel {
+    private TaskDatabase taskDatabase;
+
+    static final Comparator<Task> sortByStartDate = Comparator.comparing(Task::getStartDate);
+
+
+
+    public TaskListModel(){
+        taskDatabase = new JsonTaskDatabase();
+    }
+
+    public TaskListModel(TaskDatabase taskDatabase) {
+        this.taskDatabase = taskDatabase;
+    }
+
+    public void addTask(Task task) throws IOException {
+        taskDatabase.saveTask(task);
+    }
+
+    public void removeTask(Task task) throws IOException {
+        taskDatabase.removeTask(task);
+    }
+
+    public List<Task> getTaskList() throws IOException {
+        return getFilteredTaskList(LocalDate.MIN, LocalDate.MAX);
+    }
+
+    public List<Task> getFutureTasks() throws IOException {
+        return getFilteredTaskList(LocalDate.now(), LocalDate.MAX);
+    }
+
+    public List<Task> getPastTasks() throws IOException {
+        return getFilteredTaskList(LocalDate.MIN, LocalDate.now());
+    }
+
+    public List<Task>[] getTasksUpcomingWeek() throws IOException {
+        List<Task>[] listArray = new List[7];
+        for(int i = 0; i < 7; i++) {
+            LocalDate date = LocalDate.now().plusDays(i);
+            listArray[i] = taskDatabase.getTaskList(date, date);
+        }
+        return listArray;
+    }
+
+    public List<Task> getFilteredTaskList(LocalDate start, LocalDate end) throws IOException {
+        return getSortedTaskList(taskDatabase.getTaskList(start, end), sortByStartDate);
+    }
+
+    private List<Task> getSortedTaskList(List<Task> taskList, Comparator<Task> comparator) {
+        return taskList.stream().sorted(comparator).collect(Collectors.toList());
+    }
+}