package com.fasterxml.jackson.databind.module;
import java.util.*;
import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.databind.BaseMapTest;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
public class TestAbstractTypes extends BaseMapTest
{
/*
/**********************************************************
/* Helper classes; simple beans and their handlers
/**********************************************************
*/
static class MyString implements CharSequence
{
protected String value;
public MyString(String s) { value = s; }
@Override
public char charAt(int index) {
return value.charAt(index);
}
@Override
public int length() {
return value.length();
}
@Override
public CharSequence subSequence(int arg0, int arg1) { return this; }
}
/*
/**********************************************************
/* Unit tests
/**********************************************************
*/
public void testCollectionDefaulting() throws Exception
{
ObjectMapper mapper = new ObjectMapper();
SimpleModule mod = new SimpleModule("test", Version.unknownVersion());
// let's ensure we get hierarchic mapping
mod.addAbstractTypeMapping(Collection.class, List.class);
mod.addAbstractTypeMapping(List.class, LinkedList.class);
mapper.registerModule(mod);
Collection<?> result = mapper.readValue("[]", Collection.class);
assertEquals(LinkedList.class, result.getClass());
}
public void testMapDefaulting() throws Exception
{
ObjectMapper mapper = new ObjectMapper();
SimpleModule mod = new SimpleModule("test", Version.unknownVersion());
// default is HashMap, so:
mod.addAbstractTypeMapping(Map.class, TreeMap.class);
mapper.registerModule(mod);
Map<?,?> result = mapper.readValue("{}", Map.class);
assertEquals(TreeMap.class, result.getClass());
}
public void testInterfaceDefaulting() throws Exception
{
ObjectMapper mapper = new ObjectMapper();
SimpleModule mod = new SimpleModule("test", Version.unknownVersion());
// let's ensure we get hierarchic mapping
mod.addAbstractTypeMapping(CharSequence.class, MyString.class);
mapper.registerModule(mod);
Object result = mapper.readValue(quote("abc"), CharSequence.class);
assertEquals(MyString.class, result.getClass());
assertEquals("abc", ((MyString) result).value);
}
}