Added emial to exchanges

buisnesslogic/src/main/java/com/plannaplan/models/EmailExchangesData.java

@@ -0,0 +1,45 @@
+package com.plannaplan.models;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import com.plannaplan.entities.Exchange;
+import com.plannaplan.entities.User;
+
+/**
+ * Class to keepm data to be send after exchanges being accept
+ */
+public class EmailExchangesData {
+    private Map<Long, List<Exchange>> data;
+
+    public EmailExchangesData() {
+        this.data = new HashMap<>();
+    }
+
+    /**
+     * method to add user and his event to data to be send
+     * 
+     * @param user owner of exchange being performed
+     * @param data exchange that was executed
+     */
+    public void addExchange(User user, Exchange data) {
+        final Long id = user.getId();
+        if (this.data.get(id) == null) {
+            this.data.put(id, new ArrayList<>());
+        }
+        this.data.get(id).add(data);
+    }
+
+    /**
+     * get datas entry set
+     * 
+     * @return set with entries that contains Long that is user id and list of hiss
+     *         performed Exchanges
+     */
+    public Set<Map.Entry<Long, List<Exchange>>> getDataEntry() {
+        return this.data.entrySet();
+    }
+}