com.fasterxml.jackson.databind.deser.std

Class JsonNodeDeserializer

    • Field Detail

      • _supportsUpdates

        protected final Boolean _supportsUpdates

      • _mergeArrays

        protected final boolean _mergeArrays

      • _mergeObjects

        protected final boolean _mergeObjects

    • Constructor Detail

      • JsonNodeDeserializer

        protected JsonNodeDeserializer()

      • JsonNodeDeserializer

        protected JsonNodeDeserializer(JsonNodeDeserializer base,
                               boolean mergeArrays,
                               boolean mergeObjects)

    • Method Detail

      • _createWithMerge

        protected JsonDeserializer<?> _createWithMerge(boolean mergeArrays,
                                               boolean mergeObjects)

      • getDeserializer

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

      • deserialize

        public JsonNode deserialize(com.fasterxml.jackson.core.JsonParser p,
                            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:
        p - Parsed used for reading JSON content
        ctxt - Context that can be used to access information about this deserialization activity.
        Returns:
        Deserialized value
        Throws:
        IOException

      • supportsUpdate

        public 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 deserializer 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.

      • logicalType

        public LogicalType logicalType()
        Description copied from class: JsonDeserializer
        Method for accessing logical type of values this deserializer produces. Typically used for further configuring handling of values, for example, to find which coercions are legal.
        Overrides:
        logicalType in class JsonDeserializer<T extends JsonNode>
        Returns:
        Logical type of values this deserializer produces, if known; null if not

      • 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>

      • createContextual

        public JsonDeserializer<?> createContextual(DeserializationContext ctxt,
                                            BeanProperty property)
                                     throws JsonMappingException
        Description copied from interface: ContextualDeserializer
        Method called to see if a different (or differently configured) deserializer is needed to deserialize values of specified property. Note that instance that this method is called on is typically shared one and as a result method should NOT modify this instance but rather construct and return a new instance. This instance should only be returned as-is, in case it is already suitable for use.
        Specified by:
        createContextual in interface ContextualDeserializer
        Parameters:
        ctxt - Deserialization context to access configuration, additional deserializers that may be needed by this deserializer
        property - Method, field or constructor parameter that represents the property (and is used to assign deserialized value). Should be available; but there may be cases where caller cannot provide it and null is passed instead (in which case impls usually pass 'this' deserializer as is)
        Returns:
        Deserializer to use for deserializing values of specified property; may be this instance or a new instance.
        Throws:
        JsonMappingException

      • _handleDuplicateField

        protected void _handleDuplicateField(com.fasterxml.jackson.core.JsonParser p,
                                     DeserializationContext ctxt,
                                     JsonNodeFactory nodeFactory,
                                     String fieldName,
                                     ObjectNode objectNode,
                                     JsonNode oldValue,
                                     JsonNode newValue)
                              throws IOException
        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:
        IOException

      • _deserializeObjectAtName

        protected final ObjectNode _deserializeObjectAtName(com.fasterxml.jackson.core.JsonParser p,
                                                    DeserializationContext ctxt,
                                                    JsonNodeFactory nodeFactory,
                                                    com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.ContainerStack stack)
                                             throws IOException
        Alternate deserialization method used when parser already points to first FIELD_NAME and not START_OBJECT.
        Throws:
        IOException

      • updateObject

        protected final JsonNode updateObject(com.fasterxml.jackson.core.JsonParser p,
                                      DeserializationContext ctxt,
                                      ObjectNode node,
                                      com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.ContainerStack stack)
                               throws IOException
        Alternate deserialization method that is to update existing ObjectNode if possible.
        Throws:
        IOException
        Since:
        2.9

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