Package io.helidon.config

Class ConfigSources

java.lang.Object

io.helidon.config.ConfigSources

public final class ConfigSources
extends Object

Provides access to built-in ConfigSource implementations.

See Also:

ConfigSource

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ConfigSources.CompositeBuilder Builder of a ConfigSource that encapsulates multiple separate ConfigSources.
static class	ConfigSources.MapBuilder Builder of a ConfigSource based on a Map containing config entries.
static interface	ConfigSources.MergingStrategy An algorithm for combining multiple ConfigNode.ObjectNode root nodes into a single ConfigNode.ObjectNode root node.

Method Summary

Modifier and Type	Method and Description
static AbstractParsableConfigSource.Builder<? extends AbstractParsableConfigSource.Builder<?,Path>,Path>	classpath(String resource) Provides a Builder for creating a ConfigSource from the specified resource located on the classpath of the current thread's context classloader.
static ConfigSource	create(Config config) Returns a ConfigSource that contains the same configuration model as the provided config.
static ConfigSource	create(ConfigNode.ObjectNode objectNode) Returns a ConfigSource that wraps the specified objectNode and returns it when Source.load() is invoked.
static ConfigSources.CompositeBuilder	create(List<Supplier<ConfigSource>> configSources) Provides a ConfigSources.CompositeBuilder for creating a composite ConfigSource based on the ConfigSources and their order in the specified list.
static ConfigSources.MapBuilder	create(Map<String,String> map) Provides a ConfigSources.MapBuilder for creating a ConfigSource for a Map.
static ConfigSources.MapBuilder	create(Properties properties) Provides a ConfigSources.MapBuilder for creating a ConfigSource for a Map from a Properties object.
static ConfigSource	create(Readable readable, String mediaType) Provides a ConfigSource from the provided readable content and with the specified mediaType.
static ConfigSource	create(String content, String mediaType) Provides a ConfigSource from the provided String content and with the specified mediaType.
static ConfigSources.CompositeBuilder	create(Supplier<ConfigSource>... configSources) Provides a ConfigSources.CompositeBuilder for creating a composite ConfigSource based on the specified ConfigSources, used in the order in which they are passed as arguments.
static AbstractConfigSource.Builder<? extends AbstractConfigSource.Builder<?,Path>,Path>	directory(String path) Provides a Builder for creating a ConfigSource from the specified directory path.
static ConfigSource	empty() Provides an empty config source.
static ConfigSource	environmentVariables() Provides a @{code ConfigSource} for creating a Config from environment variables.
static AbstractParsableConfigSource.Builder<? extends AbstractParsableConfigSource.Builder<?,Path>,Path>	file(String path) Provides a Builder for creating a ConfigSource from the specified file path.
static ConfigSources.CompositeBuilder	load(Config metaConfig) Provides a ConfigSources.CompositeBuilder for creating a composite ConfigSource based on the ConfigSources returned by the provided meta-configuration.
static ConfigSources.CompositeBuilder	load(Supplier<ConfigSource>... metaSources) Provides a ConfigSources.CompositeBuilder for creating a composite ConfigSource based on the ConfigSources returned by the provided meta-sources.
static ConfigSource	prefixed(String key, Supplier<ConfigSource> sourceSupplier) Provides a ConfigSource from a sourceSupplier, adding the specified prefix to the keys in the source.
static ConfigSource	systemProperties() Provides a ConfigSource for creating a Config derived from system properties.
static AbstractParsableConfigSource.Builder<? extends AbstractParsableConfigSource.Builder<?,URL>,URL>	url(URL url) Provides a Builder for creating a ConfigSource from the specified URL.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

empty

public static ConfigSource empty()

Provides an empty config source.

Returns:

empty config source

create

public static ConfigSource create(Config config)

Returns a ConfigSource that contains the same configuration model as the provided config.

Parameters:

config - the original Config

Returns:

ConfigSource for the same Config as the original

create

public static ConfigSource create(ConfigNode.ObjectNode objectNode)

Returns a ConfigSource that wraps the specified objectNode and returns it when Source.load() is invoked.

Parameters:

objectNode - hierarchical configuration representation that will be returned by Source.load()

Returns:

new instance of ConfigSource

See Also:

ConfigNode.ObjectNode, ConfigNode.ListNode, ConfigNode.ValueNode, ConfigNode.ObjectNode.Builder, ConfigNode.ListNode.Builder

create

public static ConfigSource create(Readable readable,
                                  String mediaType)

Provides a ConfigSource from the provided readable content and with the specified mediaType.

Instant.now() is the content timestamp.

Parameters:

readable - a Readable providing the configuration content

mediaType - a configuration media type

Returns:

a config source

create

public static ConfigSource create(String content,
                                  String mediaType)

Provides a ConfigSource from the provided String content and with the specified mediaType.

Instant.now() is the content timestamp.

Parameters:

content - a configuration content

mediaType - a configuration media type

Returns:

a config source

create

public static ConfigSources.MapBuilder create(Map<String,String> map)

Provides a ConfigSources.MapBuilder for creating a ConfigSource for a Map.

Parameters:

map - a map

Returns:

new Builder instance

See Also:

create(Properties)

create

public static ConfigSources.MapBuilder create(Properties properties)

Provides a ConfigSources.MapBuilder for creating a ConfigSource for a Map from a Properties object.

Parameters:

properties - properties

Returns:

new Builder instance

See Also:

create(Map)

prefixed

public static ConfigSource prefixed(String key,
                                    Supplier<ConfigSource> sourceSupplier)

Provides a ConfigSource from a sourceSupplier, adding the specified prefix to the keys in the source.

Parameters:

key - key prefix to be added to all keys

sourceSupplier - a config source supplier

Returns:

new @{code ConfigSource} for the newly-prefixed content

systemProperties

public static ConfigSource systemProperties()

Provides a ConfigSource for creating a Config derived from system properties.

Returns:

ConfigSource for config derived from system properties

environmentVariables

public static ConfigSource environmentVariables()

Provides a @{code ConfigSource} for creating a Config from environment variables.

Returns:

ConfigSource for config derived from environment variables

classpath

public static AbstractParsableConfigSource.Builder<? extends AbstractParsableConfigSource.Builder<?,Path>,Path> classpath(String resource)

Provides a Builder for creating a ConfigSource from the specified resource located on the classpath of the current thread's context classloader.

The name of a resource is a '/'-separated full path name that identifies the resource. If the resource name has a leading slash then it is dropped before lookup.

Parameters:

resource - a name of the resource

Returns:

builder for a ConfigSource for the classpath-based resource

file

public static AbstractParsableConfigSource.Builder<? extends AbstractParsableConfigSource.Builder<?,Path>,Path> file(String path)

Provides a Builder for creating a ConfigSource from the specified file path.

Parameters:

path - a file path

Returns:

builder for the file-based ConfigSource

directory

public static AbstractConfigSource.Builder<? extends AbstractConfigSource.Builder<?,Path>,Path> directory(String path)

Provides a Builder for creating a ConfigSource from the specified directory path.

Parameters:

path - a directory path

Returns:

new Builder instance

url

public static AbstractParsableConfigSource.Builder<? extends AbstractParsableConfigSource.Builder<?,URL>,URL> url(URL url)

Provides a Builder for creating a ConfigSource from the specified URL.

Parameters:

url - a URL with configuration

Returns:

new Builder instance

See Also:

url(URL)

create

@SafeVarargs
public static ConfigSources.CompositeBuilder create(Supplier<ConfigSource>... configSources)

Provides a ConfigSources.CompositeBuilder for creating a composite ConfigSource based on the specified ConfigSources, used in the order in which they are passed as arguments.

By default the resulting ConfigSource combines the various ConfigSources using the system-provided fallback merging strategy. The application can invoke ConfigSources.CompositeBuilder.mergingStrategy to change how the sources are combined.

Parameters:

configSources - original config sources to be treated as one

Returns:

new composite config source builder instance initialized from config sources.

See Also:

ConfigSources.CompositeBuilder, ConfigSources.MergingStrategy, create(Supplier[]), create(List), load(Supplier[]), load(Config), Config.create(Supplier[]), Config.builder(Supplier[])

create

public static ConfigSources.CompositeBuilder create(List<Supplier<ConfigSource>> configSources)

Provides a ConfigSources.CompositeBuilder for creating a composite ConfigSource based on the ConfigSources and their order in the specified list.

By default the resulting ConfigSource combines the various ConfigSources using the system-provided fallback merging strategy. The application can invoke ConfigSources.CompositeBuilder.mergingStrategy to change how the sources are combined.

Parameters:

configSources - original config sources to be treated as one

Returns:

new composite config source builder instance initialized from config sources.

See Also:

ConfigSources.CompositeBuilder, ConfigSources.MergingStrategy, create(Supplier[]), create(List), load(Supplier[]), load(Config), Config.create(Supplier[]), Config.builder(Supplier[])

load

@SafeVarargs
public static ConfigSources.CompositeBuilder load(Supplier<ConfigSource>... metaSources)

Provides a ConfigSources.CompositeBuilder for creating a composite ConfigSource based on the ConfigSources returned by the provided meta-sources.

Each meta-source must contain the sources property which is an array of config sources. See ConfigSource.create(Config) for more information about the format of meta-configuration.

The returned builder is a CompositeBuilder that combines the config from all config sources derived from the meta-configuration in the meta-sources. By default the composite builder uses the fallback merging strategy.

Parameters:

metaSources - ordered list of meta-sources from which the builder will read meta-configuration indicating the config sources

Returns:

new composite config source builder initialized from the specified meta-sources.

See Also:

ConfigSources.CompositeBuilder, ConfigSources.MergingStrategy, create(Supplier[]), create(List), load(Supplier[]), load(Config), Config.builderLoadSourcesFrom(Supplier[]), Config.loadSourcesFrom(Supplier[])

load

public static ConfigSources.CompositeBuilder load(Config metaConfig)

Provides a ConfigSources.CompositeBuilder for creating a composite ConfigSource based on the ConfigSources returned by the provided meta-configuration.

The meta-configuration must contain the sources property which is an array of config sources. See ConfigSource.create(Config) for more information about the format of meta-configuration.

The returned builder is a CompositeBuilder that combines the config from all config sources derived from the meta-configuration. By default the composite builder uses the fallback merging strategy.

Parameters:

metaConfig - meta-configuration from which the builder will derive config sources

Returns:

new composite config source builder initialized from the specified meta-config

See Also:

ConfigSources.CompositeBuilder, ConfigSources.MergingStrategy, create(Supplier[]), create(List), load(Supplier[]), load(Config), Config.builderLoadSourcesFrom(Supplier[]), Config.loadSourcesFrom(Supplier[])