com.fasterxml.jackson.databind.ser.std.ClassSerializer#com.fasterxml.jackson.databind.deser.Deserializers源码实例Demo

private static ObjectMapper createProtobufMapper() {
    ObjectMapper mapper = new ObjectMapper();

    // Serialization
    mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

    // Deserialization
    mapper.disable(SerializationFeature.INDENT_OUTPUT);

    SimpleDeserializers simpleDeserializers = new SimpleDeserializers();
    simpleDeserializers.addDeserializer(String.class, new TrimmingStringDeserializer());

    List<Deserializers> deserializersList = Arrays.asList(
            new AssignableFromDeserializers(Message.class, new ProtobufMessageDeserializer()),
            simpleDeserializers
    );
    CompositeDeserializers compositeDeserializers = new CompositeDeserializers(deserializersList);
    CustomDeserializerSimpleModule module = new CustomDeserializerSimpleModule(compositeDeserializers);
    module.addSerializer(Message.class, new ProtobufMessageSerializer());
    mapper.registerModule(module);

    return mapper;
}
 

private ObjectMapper getObjectMapper() {
    ObjectMapper mapper = new ObjectMapper();

    // Serialization
    mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

    // Deserialization
    mapper.disable(SerializationFeature.INDENT_OUTPUT);

    SimpleDeserializers simpleDeserializers = new SimpleDeserializers();
    simpleDeserializers.addDeserializer(String.class, new TrimmingStringDeserializer());

    List<Deserializers> deserializersList = Arrays.asList(
            new AssignableFromDeserializers(Message.class, new ProtobufMessageDeserializer()),
            simpleDeserializers
    );
    CompositeDeserializers compositeDeserializers = new CompositeDeserializers(deserializersList);
    CustomDeserializerSimpleModule module = new CustomDeserializerSimpleModule(compositeDeserializers);
    module.addSerializer(Message.class, new ProtobufMessageSerializer());
    mapper.registerModule(module);

    return mapper;
}
 

@Override
@SuppressWarnings("unchecked")
public JsonDeserializer<Object> createBeanDeserializer(DeserializationContext ctxt, JavaType type, BeanDescription beanDesc)
        throws JsonMappingException
{
    for (Deserializers d  : _factoryConfig.deserializers()) {
        JsonDeserializer<?> deser = d.findBeanDeserializer(type, ctxt.getConfig(), beanDesc);
        if (deser != null) {
            return (JsonDeserializer<Object>) deser;
        }
    }
    throw new IllegalArgumentException("No explicitly configured deserializer for " + type);
}
 

@Test
public void deserializerByType() throws JsonMappingException {
	JsonDeserializer<Date> deserializer = new DateDeserializers.DateDeserializer();
	ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json()
			.modules(new ArrayList<>())  // Disable well-known modules detection
			.deserializerByType(Date.class, deserializer)
			.build();
	assertTrue(getDeserializerFactoryConfig(objectMapper).hasDeserializers());
	Deserializers deserializers = getDeserializerFactoryConfig(objectMapper).deserializers().iterator().next();
	assertSame(deserializer, deserializers.findBeanDeserializer(SimpleType.construct(Date.class), null, null));
}
 

@Test
public void deserializerByType() throws JsonMappingException {
	JsonDeserializer<Date> deserializer = new DateDeserializers.DateDeserializer();
	ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json()
			.modules(new ArrayList<>())  // Disable well-known modules detection
			.deserializerByType(Date.class, deserializer)
			.build();
	assertTrue(getDeserializerFactoryConfig(objectMapper).hasDeserializers());
	Deserializers deserializers = getDeserializerFactoryConfig(objectMapper).deserializers().iterator().next();
	assertSame(deserializer, deserializers.findBeanDeserializer(SimpleType.construct(Date.class), null, null));
}
 

public JsonDeserializer<?> findDeserializer(JavaType type, DeserializationConfig config,
        BeanDescription beanDesc)
    throws JsonMappingException
{
    final Class<?> rawType = type.getRawClass();

    if (_jdk7Helper != null) {
        JsonDeserializer<?> deser = _jdk7Helper.getDeserializerForJavaNioFilePath(rawType);
        if (deser != null) {
            return deser;
        }
    }
    if ((CLASS_DOM_NODE != null) && CLASS_DOM_NODE.isAssignableFrom(rawType)) {
        return (JsonDeserializer<?>) instantiate(DESERIALIZER_FOR_DOM_NODE);
    }
    if ((CLASS_DOM_DOCUMENT != null) && CLASS_DOM_DOCUMENT.isAssignableFrom(rawType)) {
        return (JsonDeserializer<?>) instantiate(DESERIALIZER_FOR_DOM_DOCUMENT);
    }
    String className = rawType.getName();
    String factoryName;
    if (className.startsWith(PACKAGE_PREFIX_JAVAX_XML)
            || hasSuperClassStartingWith(rawType, PACKAGE_PREFIX_JAVAX_XML)) {
        factoryName = DESERIALIZERS_FOR_JAVAX_XML;
    } else {
        return null;
    }
    Object ob = instantiate(factoryName);
    if (ob == null) { // could warn, if we had logging system (j.u.l?)
        return null;
    }
    return ((Deserializers) ob).findBeanDeserializer(type, config, beanDesc);
}
 

@Override
public JsonDeserializer<?> findEnumDeserializer(Class<?> type, DeserializationConfig config, BeanDescription beanDesc)
        throws JsonMappingException {
    for (Deserializers deserializers : deserializersList) {
        JsonDeserializer<?> deserializer = deserializers.findEnumDeserializer(type, config, beanDesc);
        if (deserializer != null) {
            return deserializer;
        }
    }
    return null;
}
 

@Override
public JsonDeserializer<?> findTreeNodeDeserializer(Class<? extends JsonNode> nodeType, DeserializationConfig config,
                                                    BeanDescription beanDesc) throws JsonMappingException {
    for (Deserializers deserializers : deserializersList) {
        JsonDeserializer<?> deserializer = deserializers.findTreeNodeDeserializer(nodeType, config, beanDesc);
        if (deserializer != null) {
            return deserializer;
        }
    }
    return null;
}
 

@Override
public JsonDeserializer<?> findReferenceDeserializer(ReferenceType refType, DeserializationConfig config,
                                                     BeanDescription beanDesc, TypeDeserializer contentTypeDeserializer,
                                                     JsonDeserializer<?> contentDeserializer) throws JsonMappingException {
    for (Deserializers deserializers : deserializersList) {
        JsonDeserializer<?> deserializer = deserializers.findReferenceDeserializer(refType, config, beanDesc, contentTypeDeserializer, contentDeserializer);
        if (deserializer != null) {
            return deserializer;
        }
    }
    return null;
}
 

@Override
public JsonDeserializer<?> findBeanDeserializer(JavaType type, DeserializationConfig config, BeanDescription beanDesc)
        throws JsonMappingException {
    for (Deserializers deserializers : deserializersList) {
        JsonDeserializer<?> deserializer = deserializers.findBeanDeserializer(type, config, beanDesc);
        if (deserializer != null) {
            return deserializer;
        }
    }
    return null;
}
 

@Override
public JsonDeserializer<?> findArrayDeserializer(ArrayType type, DeserializationConfig config, BeanDescription beanDesc,
                                                 TypeDeserializer elementTypeDeserializer, JsonDeserializer<?> elementDeserializer)
        throws JsonMappingException {
    for (Deserializers deserializers : deserializersList) {
        JsonDeserializer<?> deserializer = deserializers.findArrayDeserializer(type, config, beanDesc, elementTypeDeserializer, elementDeserializer);
        if (deserializer != null) {
            return deserializer;
        }
    }
    return null;
}
 

@Override
public JsonDeserializer<?> findCollectionDeserializer(CollectionType type, DeserializationConfig config, BeanDescription beanDesc,
                                                      TypeDeserializer elementTypeDeserializer, JsonDeserializer<?> elementDeserializer)
        throws JsonMappingException {
    for (Deserializers deserializers : deserializersList) {
        JsonDeserializer<?> deserializer = deserializers.findCollectionDeserializer(type, config, beanDesc, elementTypeDeserializer, elementDeserializer);
        if (deserializer != null) {
            return deserializer;
        }
    }
    return null;
}
 

@Override
public JsonDeserializer<?> findCollectionLikeDeserializer(CollectionLikeType type, DeserializationConfig config,
                                                          BeanDescription beanDesc, TypeDeserializer elementTypeDeserializer,
                                                          JsonDeserializer<?> elementDeserializer) throws JsonMappingException {
    for (Deserializers deserializers : deserializersList) {
        JsonDeserializer<?> deserializer = deserializers.findCollectionLikeDeserializer(type, config, beanDesc, elementTypeDeserializer, elementDeserializer);
        if (deserializer != null) {
            return deserializer;
        }
    }
    return null;
}
 

@Override
public JsonDeserializer<?> findMapDeserializer(MapType type, DeserializationConfig config, BeanDescription beanDesc,
                                               KeyDeserializer keyDeserializer, TypeDeserializer elementTypeDeserializer,
                                               JsonDeserializer<?> elementDeserializer) throws JsonMappingException {
    for (Deserializers deserializers : deserializersList) {
        JsonDeserializer<?> deserializer = deserializers.findMapDeserializer(type, config, beanDesc, keyDeserializer, elementTypeDeserializer, elementDeserializer);
        if (deserializer != null) {
            return deserializer;
        }
    }
    return null;
}
 

@Override
public JsonDeserializer<?> findMapLikeDeserializer(MapLikeType type, DeserializationConfig config, BeanDescription beanDesc,
                                                   KeyDeserializer keyDeserializer, TypeDeserializer elementTypeDeserializer,
                                                   JsonDeserializer<?> elementDeserializer) throws JsonMappingException {
    for (Deserializers deserializers : deserializersList) {
        JsonDeserializer<?> deserializer = deserializers.findMapLikeDeserializer(type, config, beanDesc, keyDeserializer, elementTypeDeserializer, elementDeserializer);
        if (deserializer != null) {
            return deserializer;
        }
    }
    return null;
}
 

@Test
public void deserializerByType() throws JsonMappingException {
	JsonDeserializer<Date> deserializer = new DateDeserializers.DateDeserializer();
	ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json()
			.modules(new ArrayList<>())  // Disable well-known modules detection
			.deserializerByType(Date.class, deserializer).build();
	assertTrue(getDeserializerFactoryConfig(objectMapper).hasDeserializers());
	Deserializers deserializers = getDeserializerFactoryConfig(objectMapper).deserializers().iterator().next();
	assertSame(deserializer, deserializers.findBeanDeserializer(SimpleType.construct(Date.class), null, null));
}
 

public CompositeDeserializers(List<Deserializers> deserializers) {
    this.deserializersList = deserializers;
}
 

public CustomDeserializerSimpleModule(Deserializers deserializers) {
    this.deserializers = deserializers;
}
 

/**
 * Method that module can use to register additional deserializers to use for
 * handling types.
 * 
 * @param d Object that can be called to find deserializer for types supported
 *   by module (null returned for non-supported types)
 */
public void addDeserializers(Deserializers d);