package org.codehaus.jackson.map.deser;
import javax.xml.bind.annotation.*;
import org.codehaus.jackson.map.BaseMapTest;
import org.codehaus.jackson.map.*;
import org.codehaus.jackson.xc.JaxbAnnotationIntrospector;
/**
* Simple unit tests to verify that it is possible to handle
* potentially cyclic structures, as long as object graph itself
* is not cyclic. This is the case for directed hierarchies like
* trees and DAGs.
*/
public class TestCyclicTypes
extends BaseMapTest
{
/*
/**********************************************************
/* Helper bean classes
/**********************************************************
*/
static class Bean
{
Bean _next;
String _name;
public Bean() { }
public void setNext(Bean b) { _next = b; }
public void setName(String n) { _name = n; }
}
// Also another one to ensure JAXB annotation introspector has no problems
@XmlAccessorType(XmlAccessType.FIELD)
static class JaxbBean
{
@XmlElement(required = true)
protected int id;
@XmlElement(required = false)
protected JaxbBean circular;
}
static class LinkA {
public LinkB next;
}
static class LinkB {
private LinkA a;
public void setA(LinkA a) { this.a = a; }
public LinkA getA() { return a; }
}
static class GenericLink<T> {
public GenericLink<T> next;
}
static class StringLink extends GenericLink<String> {
}
/*
/**********************************************************
/* Unit tests
/**********************************************************
*/
public void testLinked() throws Exception
{
Bean first = new ObjectMapper().readValue
("{\"name\":\"first\", \"next\": { "
+" \"name\":\"last\", \"next\" : null }}",
Bean.class);
assertNotNull(first);
assertEquals("first", first._name);
Bean last = first._next;
assertNotNull(last);
assertEquals("last", last._name);
assertNull(last._next);
}
public void testLinkedGeneric() throws Exception
{
StringLink link = new ObjectMapper().readValue
("{\"next\":null}", StringLink.class);
assertNotNull(link);
assertNull(link.next);
}
// Added to check for [JACKSON-171]
public void testWithJAXB() throws Exception
{
String jsonData = "{\"id\":1}";
ObjectMapper mapper = new ObjectMapper();
mapper.setAnnotationIntrospector(new JaxbAnnotationIntrospector());
mapper.readValue(jsonData, JaxbBean.class);
}
public void testCycleWith2Classes() throws Exception
{
LinkA a = new ObjectMapper().readValue("{\"next\":{\"a\":null}}", LinkA.class);
assertNotNull(a.next);
LinkB b = a.next;
assertNull(b.a);
}
}