package com.fasterxml.jackson.databind.ser;
import java.util.*;
import com.fasterxml.jackson.databind.BaseMapTest;
import com.fasterxml.jackson.databind.ObjectMapper;
public class TestGenericTypes extends BaseMapTest
{
/*
/**********************************************************
/* Helper types
/**********************************************************
*/
static class Account {
private Long id;
private String name;
public Account(String name, Long id) {
this.id = id;
this.name = name;
}
public String getName() { return name; }
public Long getId() { return id; }
}
static class Key<T> {
private final T id;
public Key(T id) { this.id = id; }
public T getId() { return id; }
public <V> Key<V> getParent() { return null; }
}
static class Person1 {
private Long id;
private String name;
private Key<Account> account;
public Person1(String name) { this.name = name; }
public String getName() {
return name;
}
public Key<Account> getAccount() {
return account;
}
public Long getId() {
return id;
}
public void setAccount(Key<Account> account) {
this.account = account;
}
}
static class Person2 {
private Long id;
private String name;
private List<Key<Account>> accounts;
public Person2(String name) {
this.name = name;
}
public String getName() { return name; }
public List<Key<Account>> getAccounts() { return accounts; }
public Long getId() { return id; }
public void setAccounts(List<Key<Account>> accounts) {
this.accounts = accounts;
}
}
static class GenericBogusWrapper<T> {
public Element wrapped;
public GenericBogusWrapper(T v) { wrapped = new Element(v); }
class Element {
public T value;
public Element(T v) { value = v; }
}
}
/*
/**********************************************************
/* Unit tests
/**********************************************************
*/
@SuppressWarnings("unchecked")
public void testIssue468a() throws Exception
{
Person1 p1 = new Person1("John");
p1.setAccount(new Key<Account>(new Account("something", 42L)));
// First: ensure we can serialize (pre 1.7 this failed)
ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsString(p1);
// and then verify that results make sense
Map<String,Object> map = mapper.readValue(json, Map.class);
assertEquals("John", map.get("name"));
Object ob = map.get("account");
assertNotNull(ob);
Map<String,Object> acct = (Map<String,Object>) ob;
Object idOb = acct.get("id");
assertNotNull(idOb);
Map<String,Object> key = (Map<String,Object>) idOb;
assertEquals("something", key.get("name"));
assertEquals(Integer.valueOf(42), key.get("id"));
}
@SuppressWarnings("unchecked")
public void testIssue468b() throws Exception
{
Person2 p2 = new Person2("John");
List<Key<Account>> accounts = new ArrayList<Key<Account>>();
accounts.add(new Key<Account>(new Account("a", 42L)));
accounts.add(new Key<Account>(new Account("b", 43L)));
accounts.add(new Key<Account>(new Account("c", 44L)));
p2.setAccounts(accounts);
// serialize without error:
ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsString(p2);
// then verify output
Map<String,Object> map = mapper.readValue(json, Map.class);
assertEquals("John", map.get("name"));
Object ob = map.get("accounts");
assertNotNull(ob);
List<?> acctList = (List<?>) ob;
assertEquals(3, acctList.size());
// ... might want to verify more, but for now that should suffice
}
/**
* Issue [JACKSON-572] is about unbound type variables, usually resulting
* from inner classes of generic classes (like Sets).
*/
public void testUnboundIssue572() throws Exception
{
GenericBogusWrapper<Integer> list = new GenericBogusWrapper<Integer>(Integer.valueOf(7));
String json = new ObjectMapper().writeValueAsString(list);
assertEquals("{\"wrapped\":{\"value\":7}}", json);
}
}