MoreMaps (Buck)

java.lang.Object
- com.facebook.buck.util.MoreMaps

```
public class MoreMaps
extends Object
```

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static <K extends Comparable<?>,V> com.google.common.collect.ImmutableSortedMap<K,com.google.common.collect.ImmutableList<V>>`	`convertMultimapToMapOfLists(com.google.common.collect.ImmutableMultimap<K,V> multimap)`
`static <K,V> com.google.common.collect.ImmutableMap<K,V>`	`filterValues(Map<K,V> unfiltered, com.google.common.base.Predicate<? super V> valuePredicate)` Version of `Maps.filterValues(Map, Predicate)` that collects the results in an immutable map.
`static <K,V> com.google.common.collect.ImmutableMap<K,V>`	`merge(Map<K,V> first, Map<K,V> second)`
`static <K,V> com.google.common.collect.ImmutableSortedMap<K,V>`	`mergeSorted(Map<K,V> first, Map<K,V> second)`
`static <K,V> Map<K,V>`	`putCheckEquals(Map<K,V> map, K key, V value)`
`static <K,V> Map<K,V>`	`putIfAbsentCheckEquals(ConcurrentMap<K,V> map, K key, V value)` Inserts the given value if nothing was already set for the key.
`static <K1,K2,V> com.google.common.collect.ImmutableMap<K2,V>`	`transformKeys(Map<K1,V> map, java.util.function.Function<? super K1,K2> transformer)` Transform a map to another immutable map by changing keys and keeping values
`static <K1,K2 extends Comparable<?>,V> com.google.common.collect.ImmutableSortedMap<K2,V>`	`transformKeysAndSort(Map<K1,V> map, java.util.function.Function<? super K1,K2> transformer)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

putCheckEquals

public static <K,V> Map<K,V> putCheckEquals(Map<K,V> map,
                                            K key,
                                            @Nullable
                                            V value)

putIfAbsentCheckEquals

public static <K,V> Map<K,V> putIfAbsentCheckEquals(ConcurrentMap<K,V> map,
                                                    K key,
                                                    @Nullable
                                                    V value)

Inserts the given value if nothing was already set for the key. If a value already existed for this key, ensures it is the same as the one being inserted, otherwise throws an IllegalStateException.

transformKeys

public static <K1,K2,V> com.google.common.collect.ImmutableMap<K2,V> transformKeys(Map<K1,V> map,
                                                                                   java.util.function.Function<? super K1,K2> transformer)

Transform a map to another immutable map by changing keys and keeping values

Parameters:: map - Source map to transform; transformer - Function to apply to source map key to infer resulting map key
Returns:: New immutable map with new keys and corresponding values

transformKeysAndSort

public static <K1,K2 extends Comparable<?>,V> com.google.common.collect.ImmutableSortedMap<K2,V> transformKeysAndSort(Map<K1,V> map,
                                                                                                                      java.util.function.Function<? super K1,K2> transformer)

merge

public static <K,V> com.google.common.collect.ImmutableMap<K,V> merge(Map<K,V> first,
                                                                      Map<K,V> second)

mergeSorted

public static <K,V> com.google.common.collect.ImmutableSortedMap<K,V> mergeSorted(Map<K,V> first,
                                                                                  Map<K,V> second)

convertMultimapToMapOfLists

public static <K extends Comparable<?>,V> com.google.common.collect.ImmutableSortedMap<K,com.google.common.collect.ImmutableList<V>> convertMultimapToMapOfLists(com.google.common.collect.ImmutableMultimap<K,V> multimap)

filterValues

public static <K,V> com.google.common.collect.ImmutableMap<K,V> filterValues(Map<K,V> unfiltered,
                                                                             com.google.common.base.Predicate<? super V> valuePredicate)

Version of Maps.filterValues(Map, Predicate) that collects the results in an immutable map.

See Also:: Maps.filterValues(Map, Predicate)

Class MoreMaps