Interface ConfigValue
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- All Superinterfaces:
ConfigMergeable
- All Known Subinterfaces:
ConfigList
,ConfigObject
public interface ConfigValue extends ConfigMergeable
An immutable value, following the JSON type schema.Because this object is immutable, it is safe to use from multiple threads and there's no need for "defensive copies."
Do not implement interface
ConfigValue
; it should only be implemented by the config library. Arbitrary implementations will not work because the library internals assume a specific concrete implementation. Also, this interface is likely to grow new methods over time, so third-party implementations will break.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description Config
atKey(java.lang.String key)
Places the value inside aConfig
at the given key.Config
atPath(java.lang.String path)
Places the value inside aConfig
at the given path.ConfigOrigin
origin()
The origin of the value (file, line number, etc.), for debugging and error messages.java.lang.String
render()
Renders the config value as a HOCON string.java.lang.String
render(ConfigRenderOptions options)
Renders the config value to a string, using the provided options.java.lang.Object
unwrapped()
Returns the value as a plain Java boxed value, that is, aString
,Number
,Boolean
,Map<String,Object>
,List<Object>
, ornull
, matching thevalueType()
of thisConfigValue
.ConfigValueType
valueType()
TheConfigValueType
of the value; matches the JSON type schema.ConfigValue
withFallback(ConfigMergeable other)
Returns a new value computed by merging this value with another, with keys in this value "winning" over the other one.
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Method Detail
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origin
ConfigOrigin origin()
The origin of the value (file, line number, etc.), for debugging and error messages.- Returns:
- where the value came from
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valueType
ConfigValueType valueType()
TheConfigValueType
of the value; matches the JSON type schema.- Returns:
- value's type
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unwrapped
java.lang.Object unwrapped()
Returns the value as a plain Java boxed value, that is, aString
,Number
,Boolean
,Map<String,Object>
,List<Object>
, ornull
, matching thevalueType()
of thisConfigValue
. If the value is aConfigObject
orConfigList
, it is recursively unwrapped.
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render
java.lang.String render()
Renders the config value as a HOCON string. This method is primarily intended for debugging, so it tries to add helpful comments and whitespace.If the config value has not been resolved (see
Config.resolve()
), it's possible that it can't be rendered as valid HOCON. In that case the rendering should still be useful for debugging but you might not be able to parse it. If the value has been resolved, it will always be parseable.This method is equivalent to
render(ConfigRenderOptions.defaults())
.- Returns:
- the rendered value
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render
java.lang.String render(ConfigRenderOptions options)
Renders the config value to a string, using the provided options.If the config value has not been resolved (see
Config.resolve()
), it's possible that it can't be rendered as valid HOCON. In that case the rendering should still be useful for debugging but you might not be able to parse it. If the value has been resolved, it will always be parseable.If the config value has been resolved and the options disable all HOCON-specific features (such as comments), the rendering will be valid JSON. If you enable HOCON-only features such as comments, the rendering will not be valid JSON.
- Parameters:
options
- the rendering options- Returns:
- the rendered value
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withFallback
ConfigValue withFallback(ConfigMergeable other)
Description copied from interface:ConfigMergeable
Returns a new value computed by merging this value with another, with keys in this value "winning" over the other one.This associative operation may be used to combine configurations from multiple sources (such as multiple configuration files).
The semantics of merging are described in the spec for HOCON. Merging typically occurs when either the same object is created twice in the same file, or two config files are both loaded. For example:
foo = { a: 42 } foo = { b: 43 }
Here, the two objects are merged as if you had written:foo = { a: 42, b: 43 }
Only
ConfigObject
andConfig
instances do anything in this method (they need to merge the fallback keys into themselves). All other values just return the original value, since they automatically override any fallback. This means that objects do not merge "across" non-objects; if you writeobject.withFallback(nonObject).withFallback(otherObject)
, thenotherObject
will simply be ignored. This is an intentional part of how merging works, because non-objects such as strings and integers replace (rather than merging with) any prior value:foo = { a: 42 } foo = 10
Here, the number 10 "wins" and the value offoo
would be simply 10. Again, for details see the spec.- Specified by:
withFallback
in interfaceConfigMergeable
- Parameters:
other
- an object whose keys should be used as fallbacks, if the keys are not present in this one- Returns:
- a new object (or the original one, if the fallback doesn't get used)
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atPath
Config atPath(java.lang.String path)
Places the value inside aConfig
at the given path. See alsoatKey(String)
.- Parameters:
path
- path to store this value at.- Returns:
- a
Config
instance containing this value at the given path.
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atKey
Config atKey(java.lang.String key)
Places the value inside aConfig
at the given key. See alsoatPath(String)
.- Parameters:
key
- key to store this value at.- Returns:
- a
Config
instance containing this value at the given key.
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