implemented moving of locations

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

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

@@ -6,7 +6,9 @@ import static de.srsoftware.umbrella.core.Constants.*;
 import de.srsoftware.umbrella.core.api.Owner;
 import java.sql.ResultSet;
 import java.sql.SQLException;
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 
 public class DbLocation extends Location {
 	private Owner owner;
@@ -14,6 +16,7 @@ public class DbLocation extends Location {
 	private String name;
 	private String description;
 	private String relation; // when added to an item, this field describes the type of the relation
+	private Set<String> dirtyFields = new HashSet<>();
 
 	public DbLocation(long id, Owner owner, Long parentLocationId, String name, String description){
 		super(id);
@@ -23,10 +26,23 @@ public class DbLocation extends Location {
 		this.description = description;
 	}
 
+	public DbLocation clear(){
+		dirtyFields.clear();
+		return this;
+	}
+
 	public String description() {
 		return description;
 	}
 
+	public boolean isDirty() {
+		return !dirtyFields.isEmpty();
+	}
+
+	public boolean isDirty(String field){
+		return dirtyFields.contains(field);
+	}
+
 	public String name() {
 		return name;
 	}
@@ -45,6 +61,7 @@ public class DbLocation extends Location {
 
 	public DbLocation parent(DbLocation newParent) {
 		parentLocationId = newParent.id();
+		dirtyFields.add(PARENT_LOCATION_ID);
 		return this;
 	}