export almost working

4 files changed, 87 insertions, 0 deletions

diff --git a/src/main/java/design/persistence/importexport/DataHandler.java b/src/main/java/design/persistence/importexport/DataHandler.java
new file mode 100644
index 0000000..59df9be
--- /dev/null
+++ b/src/main/java/design/persistence/importexport/DataHandler.java
@@ -0,0 +1,11 @@
+package design.persistence.importexport;
+
+import java.io.File;
+import java.io.IOException;
+
+public interface DataHandler {
+
+    void importData(File file) throws IOException;
+
+    void exportData(File file) throws IOException;
+}
diff --git a/src/main/java/design/persistence/importexport/DataSource.java b/src/main/java/design/persistence/importexport/DataSource.java
new file mode 100644
index 0000000..5290e33
--- /dev/null
+++ b/src/main/java/design/persistence/importexport/DataSource.java
@@ -0,0 +1,12 @@
+package design.persistence.importexport;
+
+import com.fasterxml.jackson.databind.JsonNode;
+
+import java.io.IOException;
+
+public interface DataSource {
+
+    void importData(JsonNode tree) throws IOException;
+
+    JsonNode exportData() throws IOException;
+}
\ No newline at end of file
diff --git a/src/main/java/design/persistence/importexport/JSONHandler.java b/src/main/java/design/persistence/importexport/JSONHandler.java
new file mode 100644
index 0000000..239eb6b
--- /dev/null
+++ b/src/main/java/design/persistence/importexport/JSONHandler.java
@@ -0,0 +1,30 @@
+package design.persistence.importexport;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.json.JsonMapper;
+
+import java.io.File;
+import java.io.IOException;
+
+public class JSONHandler implements DataHandler {
+
+    private final DataSource dataSource;
+    private final JsonMapper jsonMapper = new JsonMapper();
+
+    public JSONHandler(DataSource dataSource) {
+        this.dataSource = dataSource;
+    }
+
+    @Override
+    public void importData(File file) throws IOException {
+        JsonNode tree = jsonMapper.readTree(file);
+        dataSource.importData(tree);
+    }
+
+    @Override
+    public void exportData(File file) throws IOException{
+        JsonNode tree = dataSource.exportData();
+        jsonMapper.writerWithDefaultPrettyPrinter().writeValue(file, tree);
+    }
+}
+
+
diff --git a/src/main/java/design/persistence/importexport/XMLHandler.java b/src/main/java/design/persistence/importexport/XMLHandler.java
new file mode 100644
index 0000000..1a16b90
--- /dev/null
+++ b/src/main/java/design/persistence/importexport/XMLHandler.java
@@ -0,0 +1,34 @@
+package design.persistence.importexport;
+import java.io.File;
+import java.io.IOException;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.fasterxml.jackson.dataformat.xml.XmlMapper;
+
+public class XMLHandler implements DataHandler {
+
+    private final DataSource dataSource;
+    private final XmlMapper xmlMapper = new XmlMapper();
+
+    public XMLHandler(DataSource dataSource) {
+        this.dataSource = dataSource;
+    }
+
+    @Override
+    public void importData(File file) throws IOException {
+        JsonNode tree = xmlMapper.readTree(file);
+        JsonNode unwrapped = tree.get("items");
+        dataSource.importData(unwrapped);
+    }
+
+    @Override
+    public void exportData(File file) throws IOException {
+        JsonNode tree = dataSource.exportData();
+        ObjectNode wrapper = xmlMapper.createObjectNode();
+        wrapper.set("items", tree);
+        xmlMapper.writerWithDefaultPrettyPrinter().withRootName("export").writeValue(file, wrapper);
+    }
+}
+
+