Module logstash.logback.encoder

Package net.logstash.logback.mask

Interface ValueMasker

All Known Implementing Classes:

RegexValueMasker

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface ValueMasker

Masks JSON string and number values within a JSON stream. Invoked by MaskingJsonGenerator before a number or string value is written to determine if the value should be masked.

Comparison with FieldMasker:

• FieldMaskers are more efficient than ValueMaskers, since FieldMaskers do not inspect values.
• FieldMaskers can mask any type of JSON field (string, number, boolean, array, object), whereas a ValueMasker can only mask string and number values.
• ValueMaskers can mask element values within an array. FieldMaskers can only mask field values.

Method Summary

Modifier and Type	Method	Description
Object	mask(JsonStreamContext context, Object value)	If the given value at the JSON stream context's current path should be masked, then returns the masked value to write as the value..

Method Details

mask

Object mask(JsonStreamContext context,
 Object value)

If the given value at the JSON stream context's current path should be masked, then returns the masked value to write as the value.. The MaskingJsonGenerator will write the returned masked value as the value (instead of the original value).

If the given value at the JSON stream context's current path should NOT be masked, returns null.

Parameters:

context - the current JSON stream context, which can be used to determine the path within the JSON output. (could be at a field value path or an array element value path)

value - the number or string scalar value to potentially mask (could be a field value or an array element value).

Returns:

A non-null masked value to write if given value at the JSON stream context's current path should be masked. Otherwise null if the given value at the JSON stream context's current path should NOT be masked. To write a JSON null value as the masked value, return NullNode.instance. To write "****", the return MaskingJsonGenerator.MASK