tesseract::SearchNodeHashTable Class Reference

#include <search_node.h>

Public Member Functions
	SearchNodeHashTable ()
	~SearchNodeHashTable ()
bool	Insert (LangModEdge *lang_mod_edge, SearchNode *srch_node)
SearchNode *	Lookup (LangModEdge *lang_mod_edge, SearchNode *parent_node)

Detailed Description

Definition at line 109 of file search_node.h.

Constructor & Destructor Documentation

tesseract::SearchNodeHashTable::SearchNodeHashTable ( )

inline

Definition at line 111 of file search_node.h.

                        {
    memset(bin_size_array_, 0, sizeof(bin_size_array_));
  }

tesseract::SearchNodeHashTable::~SearchNodeHashTable ( )

inline

Definition at line 115 of file search_node.h.

                         {
  }

Member Function Documentation

bool tesseract::SearchNodeHashTable::Insert ( LangModEdge *  lang_mod_edge, SearchNode *  srch_node  )

inline

Definition at line 119 of file search_node.h.

                                                                        {
    // compute hash based on the edge and its parent node edge
    unsigned int edge_hash = lang_mod_edge->Hash();
    unsigned int parent_hash = (srch_node->ParentNode() == NULL ?
        0 : srch_node->ParentNode()->LangModelEdge()->Hash());
    unsigned int hash_bin = (edge_hash + parent_hash) % kSearchNodeHashBins;

    // already maxed out, just fail
    if (bin_size_array_[hash_bin] >= kMaxSearchNodePerBin) {
      return false;
    }

    bin_array_[hash_bin][bin_size_array_[hash_bin]++] = srch_node;

    return true;
  }

SearchNode* tesseract::SearchNodeHashTable::Lookup ( LangModEdge *  lang_mod_edge, SearchNode *  parent_node  )

inline

Definition at line 137 of file search_node.h.

                                                     {
    // compute hash based on the edge and its parent node edge
    unsigned int edge_hash = lang_mod_edge->Hash();
    unsigned int parent_hash = (parent_node == NULL ?
        0 : parent_node->LangModelEdge()->Hash());
    unsigned int hash_bin = (edge_hash + parent_hash) % kSearchNodeHashBins;

    // lookup the entries in the hash bin
    for (int node_idx = 0; node_idx < bin_size_array_[hash_bin]; node_idx++) {
      if (lang_mod_edge->IsIdentical(
          bin_array_[hash_bin][node_idx]->LangModelEdge()) == true &&
          SearchNode::IdenticalPath(
          bin_array_[hash_bin][node_idx]->ParentNode(), parent_node) == true) {
        return bin_array_[hash_bin][node_idx];
      }
    }

    return NULL;
  }

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

• cube/search_node.h