Package com.typesafe.config
Interface ConfigResolver
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public interface ConfigResolver
Implement this interface and provide an instance toConfigResolveOptions.appendResolver()
to provide custom behavior when unresolved substitutions are encountered during resolution.- Since:
- 1.3.2
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description ConfigValue
lookup(java.lang.String path)
Returns the value to substitute for the given unresolved path.ConfigResolver
withFallback(ConfigResolver fallback)
Returns a new resolver that falls back to the given resolver if this one doesn't provide a substitution itself.
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Method Detail
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lookup
ConfigValue lookup(java.lang.String path)
Returns the value to substitute for the given unresolved path. To get the components of the path useConfigUtil.splitPath(String)
. If a non-null value is returned that value will be substituted, otherwise resolution will continue to consider the substitution as still unresolved.- Parameters:
path
- the unresolved path- Returns:
- the value to use as a substitution or null
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withFallback
ConfigResolver withFallback(ConfigResolver fallback)
Returns a new resolver that falls back to the given resolver if this one doesn't provide a substitution itself. It's important to handle the case where you already have the fallback with a "return this", i.e. this method should not create a new object if the fallback is the same one you already have. The same fallback may be added repeatedly.- Parameters:
fallback
- the previous includer for chaining- Returns:
- a new resolver
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