How 2 better build this Expression?

Question

As you can see in the code below a null means don't use this object in the criteria. Conditionally building an Expression like this is rather cumbersome. There has got to be a better way to do this!
ExpressionBuilder builder = new ExpressionBuilder();
Expression expression = null;
if (name != null) {
expression = builder.get("name").equal(name);
if (age != null) {
if (expression == null) {
expression = builder.get("age").equal(age);
else {
expression = expression.and(builder.get("age").equal(age));
Collection persons = null;
if (expression == null) {
session.readAllObjects(Person.class);
else {
session.readAllObjects(Person.class, expression);

Answer 1

One thing that may help is that expression.and will allow you to pass in null (just returns the expression).
So...>>
ExpressionBuilder builder = new ExpressionBuilder();
Expression expression = null;
if (name != null) {
expression = builder.get("name").equal(name);
if (age != null) {
expression = (builder.get("age").equal(age)).and(expression);
Collection persons = session.readAllObjects(Person.class, expression);
You can also use query by example, which makes simple queries much simpler.