update hire method

java/com/aa/act/interview/org/Organization.java

@@ -4,36 +4,52 @@
 
 public abstract class Organization {
 
-	private Position root;
-
-	public Organization() {
-		root = createOrganization();
-	}
-
-	protected abstract Position createOrganization();
-
-	/**
-	 * hire the given person as an employee in the position that has that title
-	 * 
-	 * @param person
-	 * @param title
-	 * @return the newly filled position or empty if no position has that title
-	 */
-	public Optional<Position> hire(Name person, String title) {
-		//your code here
-		return Optional.empty();
-	}
-
-	@Override
-	public String toString() {
-		return printOrganization(root, "");
-	}
-
-	private String printOrganization(Position pos, String prefix) {
-		StringBuffer sb = new StringBuffer(prefix + "+-" + pos.toString() + "\n");
-		for(Position p : pos.getDirectReports()) {
-			sb.append(printOrganization(p, prefix + "\t"));
-		}
-		return sb.toString();
-	}
+    private Position root;
+
+    private static int id;
+
+    public Organization() {
+        root = createOrganization();
+    }
+
+    protected abstract Position createOrganization();
+
+    /**
+     * hire the given person as an employee in the position that has that title
+     *
+     * @param person
+     * @param title
+     * @return the newly filled position or empty if no position has that title
+     */
+    public Optional<Position> hire(Name person, String title) {
+        addNewHire(root, person, title);
+        displayDetails(root, person, title);
+        return Optional.of(root);
+    }
+
+    private void addNewHire(Position position, Name person, String title) {
+        if (position.getTitle().equals(title)) {
+            position.setEmployee(Optional.of(new Employee(++id, new Name(person.getFirst(), person.getLast()))));
+        }
+
+    }
+    private void displayDetails(Position pos, Name person, String title) {
+        for (Position p : pos.getDirectReports()) {
+            addNewHire(p, person, title);
+            displayDetails(p, person, title);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return printOrganization(root, "");
+    }
+
+    private String printOrganization(Position pos, String prefix) {
+        StringBuffer sb = new StringBuffer(prefix + "+-" + pos.toString() + "\n");
+        for (Position p : pos.getDirectReports()) {
+            sb.append(printOrganization(p, prefix + "\t"));
+        }
+        return sb.toString();
+    }
 }