public final class DeserializerCache extends java.lang.Object implements java.io.Serializable
DeserializationContext) and classes that construct deserializers (
|Constructor and Description|
|Modifier and Type||Method and Description|
Method that can be used to determine how many deserializers this provider is caching currently (if it does caching: default implementation does) Exact count depends on what kind of deserializers get cached; default implementation caches only dynamically constructed deserializers, but not eagerly constructed standard deserializers (which is different from how serializer provider works).
Method called to get hold of a deserializer to use for deserializing keys for
Method called to get hold of a deserializer for a value of given type; or if no such deserializer can be found, a default handler (which may do a best-effort generic serialization or just simply throw an exception when invoked).
Method that will drop all dynamically constructed deserializers (ones that are counted as result value for
Method called to find out whether provider would be able to find a deserializer for given type, using a root reference (i.e.
public int cachedDeserializersCount()
The main use case for this method is to allow conditional flushing of deserializer cache, if certain number of entries is reached.
public void flushCachedDeserializers()
cachedDeserializersCount()). This can be used to remove memory usage (in case some deserializers are only used once or so), or to force re-construction of deserializers after configuration changes for mapper than owns the provider.
public JsonDeserializer<java.lang.Object> findValueDeserializer(DeserializationContext ctxt, DeserializerFactory factory, JavaType propertyType) throws JsonMappingException
Note: this method is only called for value types; not for keys.
Key deserializers can be accessed using
findKeyDeserializer(com.fasterxml.jackson.databind.DeserializationContext, com.fasterxml.jackson.databind.deser.DeserializerFactory, com.fasterxml.jackson.databind.JavaType).
Note also that deserializer returned is guaranteed to be resolved
(if it is of type
not contextualized (wrt
has to handle latter if necessary.
ctxt- Deserialization context
propertyType- Declared type of the value to deserializer (obtained using 'setter' method signature and/or type annotations
JsonMappingException- if there are fatal problems with accessing suitable deserializer; including that of not finding any serializer
public KeyDeserializer findKeyDeserializer(DeserializationContext ctxt, DeserializerFactory factory, JavaType type) throws JsonMappingException
JsonMappingException- if there are fatal problems with accessing suitable key deserializer; including that of not finding any serializer
public boolean hasValueDeserializerFor(DeserializationContext ctxt, DeserializerFactory factory, JavaType type) throws JsonMappingException
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