Package org.apache.commons.collections4

Interface Trie<K,V>

Type Parameters:

K - the type of the keys in this map

V - the type of the values in this map

All Superinterfaces:

Get<K,V>, IterableGet<K,V>, IterableMap<K,V>, IterableSortedMap<K,V>, Map<K,V>, OrderedMap<K,V>, Put<K,V>, SortedMap<K,V>

All Known Implementing Classes:

AbstractBitwiseTrie, AbstractPatriciaTrie, PatriciaTrie, UnmodifiableTrie

public interface Trie<K,V>
extends IterableSortedMap<K,V>

Defines the interface for a prefix tree, an ordered tree data structure. For more information, see Tries.

Since:

4.0

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Method Summary

Modifier and Type	Method	Description
SortedMap<K,V>	prefixMap(K key)	Returns a view of this Trie of all elements that are prefixed by the given key.

Methods inherited from interface org.apache.commons.collections4.Get

containsKey, containsValue, entrySet, get, isEmpty, keySet, remove, size, values

Methods inherited from interface java.util.Map

clear, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, equals, forEach, get, getOrDefault, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size

Methods inherited from interface org.apache.commons.collections4.OrderedMap

firstKey, lastKey, mapIterator, nextKey, previousKey

Methods inherited from interface org.apache.commons.collections4.Put

clear, put, putAll

Methods inherited from interface java.util.SortedMap

comparator, entrySet, firstKey, headMap, keySet, lastKey, subMap, tailMap, values

Method Details

prefixMap

SortedMap<K,V> prefixMap(K key)

Returns a view of this Trie of all elements that are prefixed by the given key.

In a Trie with fixed size keys, this is essentially a Map.get(Object) operation.

For example, if the Trie contains 'Anna', 'Anael', 'Analu', 'Andreas', 'Andrea', 'Andres', and 'Anatole', then a lookup of 'And' would return 'Andreas', 'Andrea', and 'Andres'.

Parameters:

key - the key used in the search

Returns:

a SortedMap view of this Trie with all elements whose key is prefixed by the search key