Package com.google.api.generator.util

Class Trie<T>

java.lang.Object

com.google.api.generator.util.Trie<T>

public class Trie<T>
extends Object

A common-prefix trie. T represents the type of each "char" in a word (which is a T-typed list).

Constructor Summary

Constructors

Constructor	Description
Trie()

Method Summary

Modifier and Type	Method	Description
<R> R	dfsTraverseAndReduce(Function<T,R> parentPreprocFn, TriFunction<T,R,R,R> parentPostprocFn, BiFunction<T,R,R> leafReduceFn, R baseValue)	Reduces the trie to a single value, via a DFS traversal.
boolean	hasPrefix(List<T> prefix)	Returns true if some word in the trie begins with the given prefix.
void	insert(List<T> word)
boolean	search(List<T> word)	Returns true if the word is in the trie.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Trie

public Trie()

Method Detail

insert

public void insert(List<T> word)

search

public boolean search(List<T> word)

Returns true if the word is in the trie.

hasPrefix

public boolean hasPrefix(List<T> prefix)

Returns true if some word in the trie begins with the given prefix.

dfsTraverseAndReduce

public <R> R dfsTraverseAndReduce(Function<T,R> parentPreprocFn,
                                  TriFunction<T,R,R,R> parentPostprocFn,
                                  BiFunction<T,R,R> leafReduceFn,
                                  R baseValue)

Reduces the trie to a single value, via a DFS traversal.

Parameters:

parentPreprocFn - Transforms a parent node into an R-typed base value for consumption by the child nodes. The rest of the children will compute their values using this as a base as well, so it accumulates computational results as the traversal progresses. Does not handle the root node (i.e. when chr is null).

leafReduceFn - Transforms a child node into an R-typed value using the value computed by the parent nodes' preprocessing functions.

parentPostprocFn - Transforms the post-traversal result (from the child nodes) into R-typed values, further building upon baseValue. Must handle the root node, i.e. when chr is null.

baseValue - The base value upon which subsequent reductions will be performed. Ensure this is a type that can accumulate values, such as StringBuilder. An immutable type such as String will not work here.