Package com.google.common.collect
Interface Maps.EntryTransformer<K extends @Nullable java.lang.Object,V1 extends @Nullable java.lang.Object,V2 extends @Nullable java.lang.Object>
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- Type Parameters:
K
- the key type of the input and output entriesV1
- the value type of the input entryV2
- the value type of the output entry
- Enclosing class:
- Maps
public static interface Maps.EntryTransformer<K extends @Nullable java.lang.Object,V1 extends @Nullable java.lang.Object,V2 extends @Nullable java.lang.Object>
A transformation of the value of a key-value pair, using both key and value as inputs. To apply the transformation to a map, useMaps.transformEntries(Map, EntryTransformer)
.- Since:
- 7.0
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description V2
transformEntry(K key, V1 value)
Determines an output value based on a key-value pair.
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Method Detail
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transformEntry
V2 transformEntry(K key, V1 value)
Determines an output value based on a key-value pair. This method is generally expected, but not absolutely required, to have the following properties:- Its execution does not cause any observable side effects.
- The computation is consistent with equals; that is,
Objects.equal
(k1, k2) &&
Objects.equal(java.lang.Object, java.lang.Object)
(v1, v2)
implies thatObjects.equal(transformer.transform(k1, v1), transformer.transform(k2, v2))
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- Throws:
java.lang.NullPointerException
- if the key or value is null and this transformer does not accept null arguments
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