AliasToBeanNestedResultTransformer

Support multi-level nested associations.

You can use this class as criteria trnsformer in Hibernate to bind associated beans to the target bean.

Usage Example:

class Person {
  private Long id;
  private String name;
  private Car car;
  // getters and setters
}

class Car {
  private Long id;
  private String color;
  private Part part;
  // getters and setters
}

class Part{
	private String name;
	private String type;
}

List<Person> getPeople() {
  ProjectionList projections = Projections.projectionList()
	.add(Projections.id().as("id"))
	.add(Projections.property("name").as("name"))
	.add(Projections.property("c.id").as("car.id"))
	.add(Projections.property("c.color").as("car.color"))
	.add(Projections.property("p.name").as("car.part.name"))
	.add(Projections.property("p.type").as("car.part.type"));

  Criteria criteria = getCurrentSession().createCriteria(Person.class)
    .createAlias("car", "c")
    .setProjection(projections)
    .setResultTransformer(new AliasToBeanNestedResultTransformer(Person.class));

  return (List<Person>) criteria.list();
}

// each car of Person will be populated

This is working for one-to-one and many-to-one associations (or beans).

Test case

@Test
public void testAliasToBeanNestedResultTransformer(){
    Object[] tuple = new Object[]{"Aid","c2id","bid","cid", "cvalue"};
    String[] aliases = new String[]{"id","c.id","b.id", "b.c.id", "b.c.c"};
    AliasToBeanNestedResultTransformer a2b = new AliasToBeanNestedResultTransformer(A.class);
    A a = (A)a2b.transformTuple(tuple, aliases);
    System.out.println(a);
}

public class A extends Base{
	private B b;
	private C c;
	
	public B getB() {
		return b;
	}

	public void setB(B b) {
		this.b = b;
	}

	

	@Override
	public String toString() {
		return String.format("A [b=%s, c=%s]", b, c);
	}

	public C getC() {
		return c;
	}

	public void setC(C c) {
		this.c = c;
	}
	
	
}

public class B extends Base{
	private C c;

	public C getC() {
		return c;
	}

	public void setC(C c) {
		this.c = c;
	}

	@Override
	public String toString() {
		return String.format("B [c=%s]", c);
	}
	
}

public class C extends Base{
	private String c;
	private A a;
	public String getC() {
		return c;
	}

	public void setC(String c) {
		this.c = c;
	}

	public A getA() {
		return a;
	}

	public void setA(A a) {
		this.a = a;
	}

	@Override
	public String toString() {
		return String.format("C [c=%s, a=%s]", c, a);
	}
	
	
}

public class Base{
	private String id;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	@Override
	public String toString() {
		return String.format("Base [id=%s]", id);
	}
	
}