ICU 62.1  62.1
Public Member Functions | Static Public Member Functions | Protected Attributes
icu::StringTrieBuilder::Node Class Referenceabstract

#include <stringtriebuilder.h>

Inheritance diagram for icu::StringTrieBuilder::Node:
icu::UObject icu::UMemory icu::StringTrieBuilder::BranchNode icu::StringTrieBuilder::FinalValueNode icu::StringTrieBuilder::ValueNode icu::StringTrieBuilder::ListBranchNode icu::StringTrieBuilder::SplitBranchNode icu::StringTrieBuilder::BranchHeadNode icu::StringTrieBuilder::IntermediateValueNode icu::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. More...
virtual void write (StringTrieBuilder &builder)=0
void writeUnlessInsideRightEdge (int32_t firstRight, int32_t lastRight, StringTrieBuilder &builder)
int32_t getOffset () const
- Public Member Functions inherited from icu::UObject
virtual ~UObject ()
 Destructor. More...
virtual UClassID getDynamicClassID () const
 ICU4C "poor man's RTTI", returns a UClassID for the actual ICU class. More...

Static Public Member Functions

static int32_t hashCode (const Node *node)

Protected Attributes

int32_t hash
int32_t offset

Detailed Description

Do not use.

This API is for internal use only.

Definition at line 192 of file stringtriebuilder.h.

Member Function Documentation

◆ markRightEdgesFirst()

virtual int32_t icu::StringTrieBuilder::Node::markRightEdgesFirst ( int32_t  edgeNumber)

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.

edgeNumberThe first edge number for this node and its sub-nodes.
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 icu::StringTrieBuilder::BranchHeadNode, icu::StringTrieBuilder::SplitBranchNode, icu::StringTrieBuilder::ListBranchNode, icu::StringTrieBuilder::LinearMatchNode, and icu::StringTrieBuilder::IntermediateValueNode.

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