Class NumberDeserializers.LongDeserializer
- java.lang.Object
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- com.fasterxml.jackson.databind.JsonDeserializer<T>
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- com.fasterxml.jackson.databind.deser.std.StdDeserializer<T>
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- com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer<T>
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- com.fasterxml.jackson.databind.deser.std.NumberDeserializers.LongDeserializer
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- All Implemented Interfaces:
NullValueProvider
,ValueInstantiator.Gettable
,java.io.Serializable
- Enclosing class:
- NumberDeserializers
public static final class NumberDeserializers.LongDeserializer extends StdScalarDeserializer<T>
- See Also:
- Serialized Form
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Nested Class Summary
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Nested classes/interfaces inherited from class com.fasterxml.jackson.databind.JsonDeserializer
JsonDeserializer.None
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Constructor Summary
Constructors Constructor Description LongDeserializer(java.lang.Class<java.lang.Long> cls, java.lang.Long nvl)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Long
deserialize(JsonParser p, DeserializationContext ctxt)
Method that can be called to ask implementation to deserialize JSON content into the value type this serializer handles.boolean
isCachable()
Method called to see if deserializer instance is cachable and usable for other properties of same type (type for which instance was created).-
Methods inherited from class com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer
deserialize, deserializeWithType, getEmptyAccessPattern, supportsUpdate
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Methods inherited from class com.fasterxml.jackson.databind.deser.std.StdDeserializer
getValueClass, getValueInstantiator, getValueType, getValueType, handledType
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Methods inherited from class com.fasterxml.jackson.databind.JsonDeserializer
deserializeWithType, findBackReference, getAbsentValue, getDelegatee, getEmptyValue, getKnownPropertyNames, getNullValue, getObjectIdReader, replaceDelegatee, unwrappingDeserializer
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Method Detail
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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 classJsonDeserializer<java.lang.Long>
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deserialize
public java.lang.Long deserialize(JsonParser p, DeserializationContext ctxt) throws java.io.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 (p.currentToken() == JsonToken.START_OBJECT) { p.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 classJsonDeserializer<java.lang.Long>
- Parameters:
p
- Parsed used for reading JSON contentctxt
- Context that can be used to access information about this deserialization activity.- Returns:
- Deserialized value
- Throws:
java.io.IOException
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