com.fasterxml.jackson.databind.deser.std

Class FromStringDeserializer<T>

java.lang.Object

com.fasterxml.jackson.databind.JsonDeserializer<T>

com.fasterxml.jackson.databind.deser.std.StdDeserializer<T>

com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer<T>

com.fasterxml.jackson.databind.deser.std.FromStringDeserializer<T>

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

CoreXMLDeserializers.Std, DOMDeserializer, FromStringDeserializer.Std, UUIDDeserializer

public abstract class FromStringDeserializer<T>
extends StdScalarDeserializer<T>

Base class for simple deserializers that only accept JSON String values as the source.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FromStringDeserializer.Std "Chameleon" deserializer that works on simple types that are deserialized from a simple String.

Nested classes/interfaces inherited from class com.fasterxml.jackson.databind.JsonDeserializer

JsonDeserializer.None

Field Summary

Fields inherited from class com.fasterxml.jackson.databind.deser.std.StdDeserializer

_valueClass

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	FromStringDeserializer(Class<?> vc)

Method Summary

Modifier and Type	Method and Description
protected abstract T	_deserialize(String value, DeserializationContext ctxt)
protected T	_deserializeEmbedded(Object ob, DeserializationContext ctxt)
protected T	_deserializeFromEmptyString()
T	deserialize(JsonParser jp, DeserializationContext ctxt) Method that can be called to ask implementation to deserialize JSON content into the value type this serializer handles.
static FromStringDeserializer.Std	findDeserializer(Class<?> rawType) Factory method for trying to find a deserializer for one of supported types that have simple from-String serialization.
static Class<?>[]	types()

Methods inherited from class com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer

deserializeWithType

Methods inherited from class com.fasterxml.jackson.databind.deser.std.StdDeserializer

_deserializeFromEmpty, _hasTextualNull, _isNaN, _isNegInf, _isPosInf, _parseBoolean, _parseBooleanFromNumber, _parseBooleanPrimitive, _parseByte, _parseDate, _parseDouble, _parseDoublePrimitive, _parseFloat, _parseFloatPrimitive, _parseInteger, _parseIntPrimitive, _parseLong, _parseLongPrimitive, _parseShort, _parseShortPrimitive, _parseString, findConvertingContentDeserializer, findDeserializer, getValueClass, getValueType, handledType, handleUnknownProperty, isDefaultDeserializer, isDefaultKeyDeserializer, parseDouble

Methods inherited from class com.fasterxml.jackson.databind.JsonDeserializer

deserialize, findBackReference, getDelegatee, getEmptyValue, getKnownPropertyNames, getNullValue, getObjectIdReader, isCachable, replaceDelegatee, unwrappingDeserializer

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FromStringDeserializer

protected FromStringDeserializer(Class<?> vc)

Method Detail

types

public static Class<?>[] types()

findDeserializer

public static FromStringDeserializer.Std findDeserializer(Class<?> rawType)

Factory method for trying to find a deserializer for one of supported types that have simple from-String serialization.

deserialize

public T deserialize(JsonParser jp,
                     DeserializationContext ctxt)
              throws IOException

Description copied from class: JsonDeserializer

Method that can be called to ask implementation to deserialize JSON content into the value type this serializer handles. Returned instance is to be constructed by method itself.

Pre-condition for this method is that the parser points to the first event that is part of value to deserializer (and which is never JSON 'null' literal, more on this below): for simple types it may be the only value; and for structured types the Object start marker or a FIELD_NAME.

The two possible input conditions for structured types result from polymorphism via fields. In the ordinary case, Jackson calls this method when it has encountered an OBJECT_START, and the method implementation must advance to the next token to see the first field name. If the application configures polymorphism via a field, then the object looks like the following.

      {
          "@class": "class name",
          ...
      }
  

Jackson consumes the two tokens (the @class field name and its value) in order to learn the class and select the deserializer. Thus, the stream is pointing to the FIELD_NAME for the first field after the @class. Thus, if you want your method to work correctly both with and without polymorphism, you must begin your method with:

       if (jp.getCurrentToken() == JsonToken.START_OBJECT) {
         jp.nextToken();
       }
  

This results in the stream pointing to the field name, so that the two conditions align.

Post-condition is that the parser will point to the last event that is part of deserialized value (or in case deserialization fails, event that was not recognized or usable, which may be the same event as the one it pointed to upon call).

Note that this method is never called for JSON null literal, and thus deserializers need (and should) not check for it.

Specified by:

deserialize in class JsonDeserializer<T>

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

_deserialize

protected abstract T _deserialize(String value,
                                  DeserializationContext ctxt)
                           throws IOException

Throws:

IOException

_deserializeEmbedded

protected T _deserializeEmbedded(Object ob,
                                 DeserializationContext ctxt)
                          throws IOException

Throws:

IOException

_deserializeFromEmptyString

protected T _deserializeFromEmptyString()
                                 throws IOException

Throws:

IOException