Package com.fasterxml.jackson.databind.deser.std

Class BaseNodeDeserializer<T extends JsonNode>

    • Field Detail

      • _supportsUpdates

        protected final java.lang.Boolean _supportsUpdates

    • Constructor Detail

      • BaseNodeDeserializer

        public BaseNodeDeserializer​(java.lang.Class<T> vc,
                            java.lang.Boolean supportsUpdates)

    • Method Detail

      • deserializeWithType

        public java.lang.Object deserializeWithType​(com.fasterxml.jackson.core.JsonParser p,
                                            DeserializationContext ctxt,
                                            TypeDeserializer typeDeserializer)
                                     throws java.io.IOException
        Description copied from class: StdDeserializer
        Base implementation that does not assume specific type inclusion mechanism. Sub-classes are expected to override this method if they are to handle type information.
        Overrides:
        deserializeWithType in class StdDeserializer<T extends JsonNode>
        typeDeserializer - Deserializer to use for handling type information
        Throws:
        java.io.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>

      • supportsUpdate

        public java.lang.Boolean supportsUpdate​(DeserializationConfig config)
        Description copied from class: JsonDeserializer
        Introspection method that may be called to see whether deserializer supports update of an existing value (aka "merging") or not. Return value should either be Boolean.FALSE if update is not supported at all (immutable values); Boolean.TRUE if update should usually work (regular POJOs, for example), or null if this is either not known, or may sometimes work.

        Information gathered is typically used to either prevent merging update for property (either by skipping, if based on global defaults; or by exception during deserialization construction if explicit attempt made) if Boolean.FALSE returned, or inclusion if Boolean.TRUE is specified. If "unknown" case (null returned) behavior is to exclude property if global defaults used; or to allow if explicit per-type or property merging is defined.

        Default implementation returns null to allow explicit per-type or per-property attempts.

        Overrides:
        supportsUpdate in class JsonDeserializer<T extends JsonNode>

      • _handleDuplicateField

        protected void _handleDuplicateField​(com.fasterxml.jackson.core.JsonParser p,
                                     DeserializationContext ctxt,
                                     JsonNodeFactory nodeFactory,
                                     java.lang.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

      • deserializeObject

        protected final ObjectNode deserializeObject​(com.fasterxml.jackson.core.JsonParser p,
                                             DeserializationContext ctxt,
                                             JsonNodeFactory nodeFactory)
                                      throws java.io.IOException
        Method called to deserialize Object node instance when there is no existing node to modify.
        Throws:
        java.io.IOException

      • deserializeObjectAtName

        protected final ObjectNode deserializeObjectAtName​(com.fasterxml.jackson.core.JsonParser p,
                                                   DeserializationContext ctxt,
                                                   JsonNodeFactory nodeFactory)
                                            throws java.io.IOException
        Alternate deserialization method used when parser already points to first FIELD_NAME and not START_OBJECT.
        Throws:
        java.io.IOException
        Since:
        2.9

      • updateObject

        protected final JsonNode updateObject​(com.fasterxml.jackson.core.JsonParser p,
                                      DeserializationContext ctxt,
                                      ObjectNode node)
                               throws java.io.IOException
        Alternate deserialization method that is to update existing ObjectNode if possible.
        Throws:
        java.io.IOException
        Since:
        2.9

      • updateArray

        protected final JsonNode updateArray​(com.fasterxml.jackson.core.JsonParser p,
                                     DeserializationContext ctxt,
                                     ArrayNode node)
                              throws java.io.IOException
        Alternate deserialization method that is to update existing ObjectNode if possible.
        Throws:
        java.io.IOException
        Since:
        2.9