ICU 4.8.1.1  4.8.1.1
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Public Member Functions | Static Public Member Functions | Protected Attributes
StringTrieBuilder::Node Class Reference

#include <stringtriebuilder.h>

Inheritance diagram for StringTrieBuilder::Node:
UObject UMemory StringTrieBuilder::BranchNode StringTrieBuilder::FinalValueNode StringTrieBuilder::ValueNode StringTrieBuilder::ListBranchNode StringTrieBuilder::SplitBranchNode StringTrieBuilder::BranchHeadNode StringTrieBuilder::IntermediateValueNode StringTrieBuilder::LinearMatchNode

Public Member Functions

 Node (int32_t initialHash)
int32_t hashCode () const
virtual UBool operator== (const Node &other) const
UBool operator!= (const Node &other) const
virtual int32_t markRightEdgesFirst (int32_t edgeNumber)
 Traverses the Node graph and numbers branch edges, with rightmost edges first.
virtual void write (StringTrieBuilder &builder)=0
void writeUnlessInsideRightEdge (int32_t firstRight, int32_t lastRight, StringTrieBuilder &builder)
int32_t getOffset () const

Static Public Member Functions

static int32_t hashCode (const Node *node)

Protected Attributes

int32_t hash
int32_t offset

Detailed Description

Internal:
Do not use.

This API is for internal use only.

Definition at line 173 of file stringtriebuilder.h.


Member Function Documentation

Traverses the Node graph and numbers branch edges, with rightmost edges first.

This is to avoid writing a duplicate node twice.

Branch nodes in this trie data structure are not symmetric. Most branch edges "jump" to other nodes but the rightmost branch edges just continue without a jump. Therefore, write() must write the rightmost branch edge last (trie units are written backwards), and must write it at that point even if it is a duplicate of a node previously written elsewhere.

This function visits and marks right branch edges first. Edges are numbered with increasingly negative values because we share the offset field which gets positive values when nodes are written. A branch edge also remembers the first number for any of its edges.

When a further-left branch edge has a number in the range of the rightmost edge's numbers, then it will be written as part of the required right edge and we can avoid writing it first.

After root.markRightEdgesFirst(-1) the offsets of all nodes are negative edge numbers.

Parameters:
edgeNumberThe first edge number for this node and its sub-nodes.
Returns:
An edge number that is at least the maximum-negative of the input edge number and the numbers of this node and all of its sub-nodes.

Reimplemented in StringTrieBuilder::BranchHeadNode, StringTrieBuilder::SplitBranchNode, StringTrieBuilder::ListBranchNode, StringTrieBuilder::LinearMatchNode, and StringTrieBuilder::IntermediateValueNode.


The documentation for this class was generated from the following file:
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