30 lines
1.3 KiB
Kotlin
30 lines
1.3 KiB
Kotlin
package co.electriccoin.zcash.configuration.model.entry
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import co.electriccoin.zcash.configuration.model.map.Configuration
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/**
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* An entry represents a key and a default value for the configuration. By using an entry object,
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* multiple parts of the code can fetch the same configuration without duplication or accidental
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* variation in default value. Clients define the key and default value together, rather than just
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* the key.
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*/
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/*
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* API note: the default value is not available through the public interface in order to prevent
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* clients from accidentally using the default value instead of the configuration value.
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*
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* Implementation note: although primitives would be nice, Objects don't increase memory usage much.
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* The autoboxing cache solves Booleans, and Strings are already objects, so that just leaves Integers.
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* Overall the number of Integer configuration entries is expected to be low compared to Booleans,
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* and perhaps many Integer values will also fit within the autoboxing cache.
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*/
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interface DefaultEntry<T> {
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val key: ConfigKey
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/**
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* @param configuration Configuration mapping to check for the key given to this entry.
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* @return The value in the configuration, or the default value if no mapping exists.
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*/
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fun getValue(configuration: Configuration): T
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}
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