Examples of com.fasterxml.jackson.databind.cfg.HandlerInstantiator

Package com.fasterxml.jackson.databind.cfg

Examples of com.fasterxml.jackson.databind.cfg.HandlerInstantiator

com.fasterxml.jackson.databind.cfg.HandlerInstantiator
Helper class used for handling details of creating handler instances (things like {@link JsonSerializer}s, {@link JsonDeserializer}s, various type handlers) of specific types. Actual handler type has been resolved at this point, so instantiator is strictly responsible for providing a configured instance by constructing and configuring a new instance, or possibly by recycling a shared instance. One use case is that of allowing dependency injection, which would otherwise be difficult to do.
Custom instances are allowed to return null to indicate that caller should use the default instantiation handling (which just means calling no-argument constructor via reflection).
Care has to be taken to ensure that if instance returned is shared, it will be thread-safe; caller will not synchronize access to returned instances.

        Class<?> namingClass = (Class<?>)namingDef;
        if (!PropertyNamingStrategy.class.isAssignableFrom(namingClass)) {
            throw new IllegalStateException("AnnotationIntrospector returned Class "
                    +namingClass.getName()+"; expected Class<PropertyNamingStrategy>");
        }
        HandlerInstantiator hi = _config.getHandlerInstantiator();
        if (hi != null) {
            PropertyNamingStrategy pns = hi.namingStrategyInstance(_config, _classDef, namingClass);
            if (pns != null) {
                return pns;
            }
        }
        return (PropertyNamingStrategy) ClassUtil.createInstance(namingClass,

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        }
        if (!ValueInstantiator.class.isAssignableFrom(instClass)) {
            throw new IllegalStateException("AnnotationIntrospector returned Class "+instClass.getName()
                    +"; expected Class<ValueInstantiator>");
        }
        HandlerInstantiator hi = config.getHandlerInstantiator();
        if (hi != null) {
            inst = hi.valueInstantiatorInstance(config, annotated, instClass);
            if (inst != null) {
                return inst;
            }
        }
        return (ValueInstantiator) ClassUtil.createInstance(instClass,

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                .disable(SerializationFeature.EAGER_SERIALIZER_FETCH);


        Set<com.fasterxml.jackson.databind.Module> modules = factory.getComponents(com.fasterxml.jackson.databind.Module.class);
        mapper.registerModules(modules);


        mapper.setHandlerInstantiator(new HandlerInstantiator() {
            @Override
            public JsonDeserializer<?> deserializerInstance(DeserializationConfig config, Annotated annotated, Class<?> deserClass) {
                return (JsonDeserializer<?>) factory.queryByClass(deserClass).optional().findOneAsComponent().orNull();
            }

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com.fasterxml.jackson.databind.deser.DefaultDeserializationContext

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