OverrideSource (Helidon Project 2.6.9 API)

All Superinterfaces:

Source, Supplier<OverrideSource>

All Known Implementing Classes:

ClasspathOverrideSource, FileOverrideSource, InMemoryOverrideSource, UrlOverrideSource
```
public interface OverrideSource
extends Source, Supplier<OverrideSource>
```
Source of config override settings.
A config override setting provides an alternate, or overriding, value for a config element based on the element's key. Implementations of this interface furnish override settings as OverrideSource.OverrideData objects.
The OverrideSource.OverrideData.data method returns a List of pairs, each of which contains a Predicate which evaluates the config key and a String which is the overriding value to be used if the predicate is true. The config system applies overrides before it applies filters, and it applies only the first matching override it finds.
The config override mechanism affects existing Config nodes that come from a ConfigSource. The override mechanism cannot create additional Config nodes, only modify existing ones.

See Also:

OverrideSource.OverrideData

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static class OverrideSource.OverrideData
Group of config override settings.
- Nested classes/interfaces inherited from interface io.helidon.config.spi.Source
  Source.Builder<B extends Source.Builder<B>>

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default OverrideSource`	`get()`
`Optional<ConfigContent.OverrideContent>`	`load()`	Load override data from the underlying source.

Methods inherited from interface io.helidon.config.spi.Source
description, exists, optional, retryPolicy

- Method Detail
  - get
```
default OverrideSource get()
```
    Specified by:
    
    get in interface Supplier<OverrideSource>
  - load
```
Optional<ConfigContent.OverrideContent> load()
                                      throws ConfigException
```
    Load override data from the underlying source.
    
    Returns:
    
    override data if present, empty otherwise
    
    Throws:
    
    ConfigException - in case the loading of data failed