Bug 4391: Added DataMiningQuerySerializer which (de-)serializes a

StatisticQueryDefinitionDTO to a base64 string

java/com.sap.sse.datamining.shared/src/com/sap/sse/datamining/shared/DataMiningQuerySerializer.java

@@ -0,0 +1,47 @@
+package com.sap.sse.datamining.shared;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.Base64;
+
+import com.sap.sse.datamining.shared.dto.StatisticQueryDefinitionDTO;
+
+public final class DataMiningQuerySerializer {
+
+    private DataMiningQuerySerializer() {
+    }
+
+    public static String toBase64String(StatisticQueryDefinitionDTO dto) {
+        ByteArrayOutputStream stream = new ByteArrayOutputStream();
+        try {
+            ObjectOutputStream out = new ObjectOutputStream(stream);
+            out.writeObject(dto);
+            out.close();
+            stream.close();
+            byte[] bytes = stream.toByteArray();
+            return new String(Base64.getEncoder().encode(bytes), "UTF-8");
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return "";
+    }
+
+    public static StatisticQueryDefinitionDTO fromBase64String(String string) {
+        try {
+            byte[] bytes = Base64.getDecoder().decode(string);
+            ByteArrayInputStream stream = new ByteArrayInputStream(bytes);
+            ObjectInputStream in;
+            in = new ObjectInputStream(stream);
+            Object o = in.readObject();
+            if (o instanceof StatisticQueryDefinitionDTO) {
+                return (StatisticQueryDefinitionDTO) o;
+            }
+        } catch (IOException | ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+}