io.prestosql.jdbc.$internal.jackson.databind.util.AccessPattern Maven / Gradle / Ivy
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package io.prestosql.jdbc.$internal.jackson.databind.util;
/**
* Enumeration used to indicate required access pattern for providers:
* this can sometimes be used to optimize out dynamic calls.
* The main difference is between constant values (which can be resolved once)
* and dynamic ones (which must be resolved anew every time).
*/
public enum AccessPattern {
/**
* Value that indicates that provider never returns anything other than
* Java `null`.
*/
ALWAYS_NULL,
/**
* Value that indicates that provider will always return a constant
* value, regardless of when it is called; and also that it never
* uses `context` argument (which may then be passed as `null`)
*/
CONSTANT,
/**
* Value that indicates that provider may return different values
* at different times (often a freshly constructed empty container),
* and thus must be called every time "null replacement" value is
* needed.
*/
DYNAMIC
;
}