working on update of transactions

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

core/src/main/java/de/srsoftware/umbrella/core/model/Transaction.java

@@ -21,6 +21,7 @@ public class Transaction implements Mappable {
 	private double amount;
 	private String purpose;
 	private Set<String> tags;
+	private HashSet<String> dirtyFields = new HashSet<>();
 
 	public Transaction(long id, long accountId, LocalDateTime date, IdOrString source, IdOrString destination, double amount, String purpose, Set<String> tags){
 		this.id          = id;
@@ -41,17 +42,23 @@ public class Transaction implements Mappable {
 		return amount;
 	}
 
+	public Transaction clearDirtyState(){
+		dirtyFields.clear();
+		return this;
+	}
+
 	public LocalDateTime date(){
 		return date;
 	}
 
 	public Transaction date(LocalDateTime newVal){
 		date = newVal;
+		dirtyFields.add(Field.DATE);
 		return this;
 	}
 
-	public void date(LocalDate date) {
-		this.date = this.date.withYear(date.getYear()).withMonth(date.getMonthValue()).withDayOfMonth(date.getDayOfMonth());
+	public Transaction date(LocalDate date) {
+		return date(this.date.withYear(date.getYear()).withMonth(date.getMonthValue()).withDayOfMonth(date.getDayOfMonth()));
 	}
 
 	public IdOrString destination(){
@@ -62,6 +69,10 @@ public class Transaction implements Mappable {
 		return id;
 	}
 
+	public boolean isDirty(){
+		return !dirtyFields.isEmpty();
+	}
+
 	public static Transaction of(ResultSet rs) throws SQLException {
 		var accountId   = rs.getLong(Field.ACCOUNT);
 		var timestamp   = rs.getLong(Field.TIMESTAMP);
@@ -78,6 +89,12 @@ public class Transaction implements Mappable {
 		return purpose;
 	}
 
+	public Transaction purpose(String newVal){
+		purpose = newVal;
+		dirtyFields.add(Field.PURPOSE);
+		return this;
+	}
+
 	public IdOrString source(){
 		return source;
 	}