implemented Methods to sort and filter PlantList

src/main/java/ch/zhaw/gartenverwaltung/plantList/PlantListModel.java

@@ -0,0 +1,45 @@
+package ch.zhaw.gartenverwaltung.plantList;
+
+import ch.zhaw.gartenverwaltung.types.Plant;
+
+import java.util.Comparator;
+import java.util.List;
+import java.util.function.Function;
+import java.util.function.Predicate;
+
+public class PlantListModel {
+    private List<Plant> plantList;
+
+    /**
+     * Comparators to create sorted Plant List
+     */
+    public final Comparator<Plant> sortByName = (Plant o1, Plant o2) -> o1.name().compareTo(o2.name());
+    public final Comparator<Plant> getSortById = (Plant o1, Plant o2) -> Long.compare(o1.id(), o2.id());
+    public final Comparator<Plant> sortBySpacing = (Plant o1, Plant o2) -> o1.spacing() - o2.spacing();
+
+    /**
+     * Functions to get Plant Attribute as String
+     */
+    public final Function<Plant, String> filterByName = Plant::name;
+    public final Function<Plant, String> filterById = plant -> Long.toString(plant.id());
+
+    public PlantListModel(List<Plant> plantList) {
+        setPlantList(plantList);
+    }
+
+    public void setPlantList(List<Plant> plantList) {
+        this.plantList = plantList;
+    }
+
+    public List<Plant> getPlantList() {
+        return getSortedPlantList(sortByName);
+    }
+
+    public List<Plant> getSortedPlantList(Comparator<Plant> comparator) {
+        return plantList.stream().sorted(comparator).toList();
+    }
+
+    public List<Plant> getFilteredList(String filterString, Function<Plant, String> filterFunction) {
+        return plantList.stream().filter(plant -> filterFunction.apply(plant).contains(filterString)).toList();
+    }
+}