preparing to update item base data

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

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

@@ -4,11 +4,14 @@ package de.srsoftware.umbrella.core.model;
 import static de.srsoftware.umbrella.core.Constants.*;
 
 import de.srsoftware.tools.Mappable;
+import org.json.JSONObject;
+
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 
 public class Item implements Mappable {
 	private long id;
@@ -16,6 +19,7 @@ public class Item implements Mappable {
 	private String code, name;
 	private Location location;
 	private Collection<Property> properties;
+	private Set<String> dirtyFields = new HashSet<>();
 
 	private Item(Mappable owner, long id, Location location, String code, String name) {
 		this.owner = owner;
@@ -26,6 +30,10 @@ public class Item implements Mappable {
 		this.properties = new HashSet<>();
 	}
 
+	public boolean isDirty(){
+		return !dirtyFields.isEmpty();
+	}
+
 	public long id(){
 		return id;
 	}
@@ -62,4 +70,19 @@ public class Item implements Mappable {
 	public String toString() {
 		return name;
 	}
+
+	public Item patch(JSONObject json) {
+		for (var field : json.keySet()){
+			var known = true;
+			switch (field) {
+				case NAME:
+					name = json.getString(field);
+					break;
+				default:
+					known = false;
+			}
+			if (known) dirtyFields.add(field);
+		}
+		return this;
+	}
 }