Module io.helidon.config

Package io.helidon.config

Class ClasspathConfigSource

java.lang.Object

io.helidon.config.AbstractSource

io.helidon.config.AbstractConfigSource

io.helidon.config.ClasspathConfigSource

All Implemented Interfaces:

ConfigSource, ParsableSource, Source, Supplier<ConfigSource>

public class ClasspathConfigSource
extends AbstractConfigSource
implements ConfigSource, ParsableSource

ConfigSource implementation that loads configuration content from a resource on a classpath. Classpath config source does not support changes (neither through polling nor through change notifications).

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	ClasspathConfigSource.Builder	Classpath ConfigSource Builder.

Method Summary

Modifier and Type	Method	Description
static ClasspathConfigSource.Builder	builder()	Create a new fluent API builder for classpath config source.
static ClasspathConfigSource	create(Config metaConfig)	Initializes config source instance from configuration properties.
static ClasspathConfigSource	create(String resource)	Create a config source for the first resource on the classpath.
static List<ConfigSource>	createAll(Config metaConfig)	Create config source for each resource on the classpath.
static Collection<? super ClasspathConfigSource>	createAll(String resource)	Create config source for each resource on the classpath.
Optional<ConfigParser.Content>	load()	Loads the underlying source data.
Optional<String>	mediaType()	Media type if on eis configured for parsing content of ParsableSource.
Optional<ConfigParser>	parser()	Config parser if one is configured to use for parsing content of ParsableSource.
Function<String,Optional<InputStream>>	relativeResolver()	Resolve relative resource to the current resource.
String	toString()
protected String	uid()	Returns universal id of source to be used to construct AbstractSource.description().

Methods inherited from class io.helidon.config.AbstractSource

changeWatcher, description, optional, pollingStrategy, retryPolicy

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.helidon.config.spi.ConfigSource

get, init

Methods inherited from interface io.helidon.config.spi.Source

description, exists, optional, retryPolicy

Method Details

create

public static ClasspathConfigSource create(Config metaConfig)
                                    throws ConfigMappingException,
MissingValueException

Initializes config source instance from configuration properties.

Mandatory properties, see ConfigSources.classpath(String):

• resource - type String

Optional properties: see AbstractConfigSourceBuilder.config(io.helidon.config.Config).

Parameters:

metaConfig - meta-configuration used to initialize returned config source instance from.

Returns:

new instance of config source described by metaConfig

Throws:

MissingValueException - in case the configuration tree does not contain all expected sub-nodes required by the mapper implementation to provide instance of Java type.

ConfigMappingException - in case the mapper fails to map the (existing) configuration tree represented by the supplied configuration node to an instance of a given Java type.

See Also:

• ConfigSources.classpath(String)
• AbstractConfigSourceBuilder.config(Config)

create

public static ClasspathConfigSource create(String resource)

Create a config source for the first resource on the classpath.

Parameters:

resource - resource to find

Returns:

a config source based on the classpath resource

createAll

public static Collection<? super ClasspathConfigSource> createAll(String resource)

Create config source for each resource on the classpath.

Parameters:

resource - resource to find

Returns:

a collection of sources for each resource present on the classpath, always at least one

createAll

public static List<ConfigSource> createAll(Config metaConfig)

Create config source for each resource on the classpath.

Parameters:

metaConfig - meta configuration of the config source

Returns:

a collection of sources for each resource present on the classpath

builder

public static ClasspathConfigSource.Builder builder()

Create a new fluent API builder for classpath config source.

Returns:

a new builder instance

uid

protected String uid()

Description copied from class: AbstractSource

Returns universal id of source to be used to construct AbstractSource.description().

Overrides:

uid in class AbstractSource

Returns:

universal id of source

load

public Optional<ConfigParser.Content> load()
                                    throws ConfigException

Description copied from interface: ParsableSource

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. In case the underlying data is gone or does not exist, return an empty optional.

Specified by:

load in interface ParsableSource

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

relativeResolver

public Function<String,Optional<InputStream>> relativeResolver()

Description copied from interface: ParsableSource

Resolve relative resource to the current resource.

Specified by:

relativeResolver in interface ParsableSource

Returns:

a function to resolve resource name into an input stream

toString

public String toString()

Overrides:

toString in class AbstractConfigSource

mediaType

public Optional<String> mediaType()

Description copied from class: AbstractConfigSource

Media type if on eis configured for parsing content of ParsableSource. If there is none configured (default), a parser is chosen based on ConfigParser.Content.mediaType() - media type detected during load of data.

Specified by:

mediaType in interface ParsableSource

Overrides:

mediaType in class AbstractConfigSource

Returns:

configured media type or empty if none configured

parser

public Optional<ConfigParser> parser()

Description copied from class: AbstractConfigSource

Config parser if one is configured to use for parsing content of ParsableSource. If one is not configured on a source (default), a parser is chosen based on AbstractConfigSource.mediaType().

Specified by:

parser in interface ParsableSource

Overrides:

parser in class AbstractConfigSource

Returns:

a configured parser, or empty if one should be chosen from media type (or if this is not a parsable source)