TestGenericMapDeser.java

package com.fasterxml.jackson.databind.deser;

import java.util.*;

import com.fasterxml.jackson.annotation.*;

import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.type.TypeFactory;

@SuppressWarnings("serial")
public class TestGenericMapDeser
    extends BaseMapTest
{
    /*
    /**********************************************************
    /* Test classes, enums
    /**********************************************************
     */

    static class BooleanWrapper {
        final Boolean b;
        @JsonCreator BooleanWrapper(Boolean value) { b = value; }
    }

    static class StringWrapper {
        final String str;
        @JsonCreator StringWrapper(String value) {
            str = value;
        }
    }

    static class MapSubClass extends HashMap<String,BooleanWrapper> { }

    /**
     * Map class that should behave like {@link MapSubClass}, but by
     * using annotations.
     */
    @JsonDeserialize(keyAs=StringWrapper.class, contentAs=BooleanWrapper.class)
        static class AnnotatedMap extends HashMap<Object,Object> { }

    interface MapWrapper<K,V> extends java.io.Serializable {
        public abstract Map<K,V> getEntries();
    }

    static class StringMap implements MapWrapper<String,Long>
    {
        private Map<String,Long> entries = new LinkedHashMap<String,Long>();

        public StringMap() { }

        @Override
        public Map<String,Long> getEntries() { return entries; }
    }

    static class StringWrapperValueMap<KEY> extends HashMap<KEY,StringWrapper> { }

    static class StringStringWrapperMap extends StringWrapperValueMap<String> { }

    static class KeyTypeCtor  {
        protected String value;
        public KeyTypeCtor(String v) { value = v; }
    }

    static class KeyTypeFactory  {
        protected String value;
        private KeyTypeFactory(String v, boolean foo) { value = v; }

        @JsonCreator
        public static KeyTypeFactory create(String str) {
            return new KeyTypeFactory(str, true);
        }
    }
    
    /*
    /**********************************************************
    /* Test methods for sub-classing
    /**********************************************************
     */

    /**
     * Verifying that sub-classing works ok wrt generics information
     */
    public void testMapSubClass() throws Exception
    {
        ObjectMapper mapper = new ObjectMapper();
        MapSubClass result = mapper.readValue
            ("{\"a\":true }", MapSubClass.class);
        assertEquals(1, result.size());
        Object value = result.get("a");
        assertEquals(BooleanWrapper.class, value.getClass());
        BooleanWrapper bw = (BooleanWrapper) value;
        assertEquals(Boolean.TRUE, bw.b);
    }

    public void testMapWrapper() throws Exception
    {
        StringMap value = new ObjectMapper().readValue
            ("{\"entries\":{\"a\":9} }", StringMap.class);
        assertNotNull(value.getEntries());
        assertEquals(1, value.getEntries().size());
        assertEquals(Long.valueOf(9), value.getEntries().get("a"));
    }

    public void testIntermediateTypes() throws Exception
    {
        StringStringWrapperMap result = new ObjectMapper().readValue
            ("{\"a\":\"b\"}", StringStringWrapperMap.class);
        assertEquals(1, result.size());
        Object value = result.get("a");
        assertNotNull(value);
        assertEquals(value.getClass(), StringWrapper.class);
        assertEquals("b", ((StringWrapper) value).str);
    }
    
    /*
    /**********************************************************
    /* Test methods for sub-classing for annotation handling
    /**********************************************************
     */

    /**
     * Verifying that sub-classing works ok wrt generics information
     */
    public void testAnnotatedMap() throws Exception
    {
        ObjectMapper mapper = new ObjectMapper();
        AnnotatedMap result = mapper.readValue
            ("{\"a\":true }", AnnotatedMap.class);
        assertEquals(1, result.size());
        Map.Entry<Object,Object> en = result.entrySet().iterator().next();
        assertEquals(StringWrapper.class, en.getKey().getClass());
        assertEquals(BooleanWrapper.class, en.getValue().getClass());
        assertEquals("a", ((StringWrapper) en.getKey()).str);
        assertEquals(Boolean.TRUE, ((BooleanWrapper) en.getValue()).b);
    }

    /*
    /**********************************************************
    /* Test methods for ensuring @JsonCreator works for keys
    /**********************************************************
     */

    public void testKeyViaCtor() throws Exception
    {
        ObjectMapper mapper = new ObjectMapper();
        Map<KeyTypeCtor,Integer> map = mapper.readValue("{\"a\":123}",
                TypeFactory.defaultInstance().constructMapType(HashMap.class, KeyTypeCtor.class, Integer.class));
        assertEquals(1, map.size());
        Map.Entry<?,?> entry = map.entrySet().iterator().next();
        assertEquals(Integer.valueOf(123), entry.getValue());
        Object key = entry.getKey();
        assertEquals(KeyTypeCtor.class, key.getClass());
        assertEquals("a", ((KeyTypeCtor) key).value);
    }

    public void testKeyViaFactory() throws Exception
    {
        ObjectMapper mapper = new ObjectMapper();
        Map<KeyTypeCtor,Integer> map = mapper.readValue("{\"a\":123}",
                TypeFactory.defaultInstance().constructMapType(HashMap.class, KeyTypeFactory.class, Integer.class));
        assertEquals(1, map.size());
        Map.Entry<?,?> entry = map.entrySet().iterator().next();
        assertEquals(Integer.valueOf(123), entry.getValue());
        Object key = entry.getKey();
        assertEquals(KeyTypeFactory.class, key.getClass());
        assertEquals("a", ((KeyTypeFactory) key).value);
    }

}