Module io.helidon.config
Package io.helidon.config

Class PrefixedConfigSource

java.lang.Object
io.helidon.config.PrefixedConfigSource
All Implemented Interfaces:
ConfigSource, EventConfigSource, NodeConfigSource, Source, Supplier<ConfigSource>
public final class PrefixedConfigSource extends Object implements ConfigSource, NodeConfigSource, EventConfigSource
ConfigSource implementation wraps another config source and add key prefix to original one. Only supports "eager" config sources, such as ParsableSource and NodeConfigSource.
See Also:

  • Method Details

    • create

      public static PrefixedConfigSource create(Config metaConfig)
      Create a prefixed config source from meta configuration. The meta configuration must contain the configuration key "key" and meta configuration of another config source to be prefixed with the key.
      Parameters:
      metaConfig - meta configuration
      Returns:
      a new prefixed config source

    • create

      public static PrefixedConfigSource create(String key, ConfigSource source)
      Create a new prefixed config source.
      Parameters:
      key - prefix key
      source - wrapped source
      Returns:
      a new prefixed config source

    • init

      public void init(ConfigContext context)
      Description copied from interface: ConfigSource
      Initialize the config source with a ConfigContext.

      The method is executed during Config bootstrapping by Config.Builder.

      Specified by:
      init in interface ConfigSource
      Parameters:
      context - a config context

    • description

      public String description()
      Description copied from interface: Source
      Short, human-readable summary referring to the underlying source.

      For example, a file path or a URL or any other information that helps the user recognize the underlying origin of the data this Source provides.

      Default is the implementation class simple name with any "Source" suffix removed.

      Specified by:
      description in interface Source
      Returns:
      description of the source

    • load

      public Optional<ConfigContent.NodeContent> load() throws ConfigException
      Description copied from interface: NodeConfigSource
      Loads the underlying source data. This method is only called when the source Source.exists().

      The method can be invoked repeatedly, for example during retries.

      Specified by:
      load in interface NodeConfigSource
      Returns:
      An instance of T as read from the underlying origin of the data (if it exists)
      Throws:
      ConfigException - in case of errors loading from the underlying origin

    • onChange

      public void onChange(BiConsumer<String,ConfigNode> changedNode)
      Description copied from interface: EventConfigSource
      Register a change listener.
      Specified by:
      onChange in interface EventConfigSource
      Parameters:
      changedNode - the key and node of the configuration that changed. This may be the whole config tree, or a specific node depending on how fine grained the detection mechanism is. To notify of a whole node being changed, use empty string as a key

    • exists

      public boolean exists()
      Description copied from interface: Source
      If the underlying data exist at this time. This is to prevent us loading such a source if we know it does not exist.
      Specified by:
      exists in interface Source
      Returns:
      true if the source exists, false otherwise

    • retryPolicy

      public Optional<RetryPolicy> retryPolicy()
      Description copied from interface: Source
      Retry policy configured on this config source.
      Specified by:
      retryPolicy in interface Source
      Returns:
      configured retry policy

    • optional

      public boolean optional()
      Description copied from interface: Source
      Whether this source is optional.
      Specified by:
      optional in interface Source
      Returns:
      return true for optional source, returns false by default