com.fasterxml.jackson.databind.deser.std

Class JsonNodeDeserializer

    • Constructor Detail

      • JsonNodeDeserializer

        protected JsonNodeDeserializer()

    • Method Detail

      • getDeserializer

        public static JsonDeserializer<? extends JsonNode> getDeserializer(Class<?> nodeClass)
        Factory method for accessing deserializer for specific node type

      • getNullValue

        public JsonNode getNullValue()
        Description copied from class: JsonDeserializer
        Method that can be called to determine value to be used for representing null values (values deserialized when JSON token is JsonToken.VALUE_NULL). Usually this is simply Java null, but for some types (especially primitives) it may be necessary to use non-null values.

        Note that deserializers are allowed to call this just once and then reuse returned value; that is, method is not guaranteed to be called once for each conversion.

        Default implementation simply returns null.

        Overrides:
        getNullValue in class JsonDeserializer<JsonNode>

      • deserialize

        public JsonNode deserialize(com.fasterxml.jackson.core.JsonParser jp,
                   DeserializationContext ctxt)
                     throws IOException
        Implementation that will produce types of any JSON nodes; not just one deserializer is registered to handle (in case of more specialized handler). Overridden by typed sub-classes for more thorough checking
        Specified by:
        deserialize in class JsonDeserializer<JsonNode>
        Parameters:
        jp - Parsed used for reading JSON content
        ctxt - Context that can be used to access information about this deserialization activity.
        Returns:
        Deserialized value
        Throws:
        IOException

      • isCachable

        public boolean isCachable()
        Description copied from class: JsonDeserializer
        Method called to see if deserializer instance is cachable and usable for other properties of same type (type for which instance was created).

        Note that cached instances are still resolved on per-property basis, if instance implements ResolvableDeserializer: cached instance is just as the base. This means that in most cases it is safe to cache instances; however, it only makes sense to cache instances if instantiation is expensive, or if instances are heavy-weight.

        Default implementation returns false, to indicate that no caching is done.

        Overrides:
        isCachable in class JsonDeserializer<T extends JsonNode>

      • _handleDuplicateField

        @Deprecated
protected void _handleDuplicateField(String fieldName,
                                    ObjectNode objectNode,
                                    JsonNode oldValue,
                                    JsonNode newValue)
                              throws com.fasterxml.jackson.core.JsonProcessingException
        Deprecated. Since 2.3, use the overloaded variant
        Throws:
        com.fasterxml.jackson.core.JsonProcessingException

      • _handleDuplicateField

        protected void _handleDuplicateField(com.fasterxml.jackson.core.JsonParser jp,
                         DeserializationContext ctxt,
                         JsonNodeFactory nodeFactory,
                         String fieldName,
                         ObjectNode objectNode,
                         JsonNode oldValue,
                         JsonNode newValue)
                              throws com.fasterxml.jackson.core.JsonProcessingException
        Method called when there is a duplicate value for a field. By default we don't care, and the last value is used. Can be overridden to provide alternate handling, such as throwing an exception, or choosing different strategy for combining values or choosing which one to keep.
        Parameters:
        fieldName - Name of the field for which duplicate value was found
        objectNode - Object node that contains values
        oldValue - Value that existed for the object node before newValue was added
        newValue - Newly added value just added to the object node
        Throws:
        com.fasterxml.jackson.core.JsonProcessingException

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