1.9.10/src/test/org/codehaus/jackson/map/jsontype/TestDefaultForArrays.java

package org.codehaus.jackson.map.jsontype;

import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.annotate.JsonTypeInfo;
import org.codehaus.jackson.map.*;
import org.codehaus.jackson.map.ObjectMapper.DefaultTyping;

public class TestDefaultForArrays extends BaseMapTest
{
    /*
    /**********************************************************
    /* Helper types
    /**********************************************************
     */

    static class ArrayBean {
        public Object[] values;

        public ArrayBean() { this(null); }
        public ArrayBean(Object[] v) { values = v; }
    }
    
    /*
    /**********************************************************
    /* Unit tests
    /**********************************************************
     */

    /**
     * Simple unit test for verifying that we get String array
     * back, even though declared type is Object array
     */
    public void testArrayTypingSimple() throws Exception
    {
        ObjectMapper m = new ObjectMapper();
        m.enableDefaultTyping(DefaultTyping.NON_CONCRETE_AND_ARRAYS);
        ArrayBean bean = new ArrayBean(new String[0]);
        String json = m.writeValueAsString(bean);
        ArrayBean result = m.readValue(json, ArrayBean.class);
        assertNotNull(result.values);
        assertEquals(String[].class, result.values.getClass());
    }

    // And let's try it with deeper array as well
    public void testArrayTypingNested() throws Exception
    {
        ObjectMapper m = new ObjectMapper();
        m.enableDefaultTyping(DefaultTyping.NON_CONCRETE_AND_ARRAYS);
        ArrayBean bean = new ArrayBean(new String[0][0]);
        String json = m.writeValueAsString(bean);
        ArrayBean result = m.readValue(json, ArrayBean.class);
        assertNotNull(result.values);
        assertEquals(String[][].class, result.values.getClass());
    }

    // @since 1.8
    public void testNodeInArray() throws Exception
    {
        JsonNode node = new ObjectMapper().readTree("{\"a\":3}");

        ObjectMapper m = new ObjectMapper();
        m.enableDefaultTyping(DefaultTyping.JAVA_LANG_OBJECT);
        Object[] obs = new Object[] { node };
        String json = m.writeValueAsString(obs);
        Object[] result = m.readValue(json, Object[].class);
        assertEquals(1, result.length);
        Object ob = result[0];
        assertTrue(ob instanceof JsonNode);
    }


    // test for [JACKSON-845]
    public void testArraysOfArrays() throws Exception
    {
        ObjectMapper mapper = new ObjectMapper();
        mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);

        Object value = new Object[][] { new Object[] {} };
        String json = mapper.writeValueAsString(value);

        // try with different (but valid) nominal types:
        _testArraysAs(mapper, json, Object[][].class);
        _testArraysAs(mapper, json, Object[].class);
        _testArraysAs(mapper, json, Object.class);
    }

    /*
    /**********************************************************
    /* Helper methods
    /**********************************************************
     */
    
    protected void _testArraysAs(ObjectMapper mapper, String json, Class<?> type)
        throws Exception
    {
        Object o = mapper.readValue(json, type);
        assertNotNull(o);
        assertTrue(o instanceof Object[]);
        Object[] main = (Object[]) o;
        assertEquals(1, main.length);
        Object element = main[0];
        assertNotNull(element);
        assertTrue(element instanceof Object[]);
        assertEquals(0, ((Object[]) element).length);
    }
}