#17 implementation JsonTaskDatabase.java, gradle import for jackson

build.gradle

@@ -37,6 +37,8 @@ dependencies {
 
     testImplementation("org.junit.jupiter:junit-jupiter-api:${junitVersion}")
     testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:${junitVersion}")
+    implementation group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.13.4'
+    implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.13.4'
 }
 
 test {

src/main/java/ch/zhaw/gartenverwaltung/io/JsonTaskDatabase.java

@@ -0,0 +1,67 @@
+package ch.zhaw.gartenverwaltung.io;
+
+import ch.zhaw.gartenverwaltung.types.Task;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
+import com.fasterxml.jackson.datatype.jsr310.deser.MonthDayDeserializer;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URL;
+import java.time.MonthDay;
+import java.time.format.DateTimeFormatter;
+import java.util.Collections;
+import java.util.Date;
+import java.util.List;
+import java.util.Optional;
+
+public class JsonTaskDatabase implements TaskDatabase{
+    private final URL dataSource = getClass().getResource("taskdb.json");
+
+    private final static JavaTimeModule timeModule = new JavaTimeModule();
+    static {
+        DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("MM-dd");
+        MonthDayDeserializer dateDeserializer = new MonthDayDeserializer(dateFormat);
+        timeModule.addDeserializer(MonthDay.class, dateDeserializer);
+    }
+
+    @Override
+    public List<Task> getTaskList(Date start, Date end) throws IOException{
+        List<Task> taskList = Collections.emptyList();
+
+        if (dataSource != null) {
+            ObjectMapper mapper = new ObjectMapper();
+            mapper.registerModule(timeModule);
+
+            taskList = mapper.readerForListOf(Task.class).readValue(dataSource);
+        }
+
+        return taskList;
+    }
+
+    @Override
+    public void saveTask(Task task) throws IOException {
+        ObjectMapper mapper = new ObjectMapper();
+        if(dataSource != null) {
+            mapper.writeValue(new File(dataSource.getFile()), task);
+        } else {
+            mapper.writeValue(new File("taskdb.json"),task);
+        }
+    }
+
+    @Override
+    public void removeTask(Task task) throws IOException {
+        List<Task> taskList;
+
+        if(dataSource != null) {
+            ObjectMapper mapper = new ObjectMapper();
+            taskList = mapper.readerForListOf(Task.class).readValue(dataSource);
+            for (int index = 0; index < taskList.size(); index++){
+                if(task.equals(taskList.get(index))){
+                    taskList.remove(task);
+                    break;
+                }
+            }
+        }
+    }
+}

src/main/java/ch/zhaw/gartenverwaltung/io/TaskDatabase.java

@@ -7,7 +7,7 @@ import java.util.Date;
 import java.util.List;
 
 public interface TaskDatabase {
-    List<Task> getTaskList(Date start, Date end);
+    List<Task> getTaskList(Date start, Date end) throws IOException;
     void saveTask(Task task) throws IOException;
     void removeTask(Task task) throws IOException;
 }

src/main/java/module-info.java

@@ -1,6 +1,8 @@
 module ch.zhaw.gartenverwaltung {
     requires javafx.controls;
     requires javafx.fxml;
+    requires com.fasterxml.jackson.databind;
+    requires com.fasterxml.jackson.datatype.jsr310;
 
 
     opens ch.zhaw.gartenverwaltung to javafx.fxml;