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#ifndef _MATCHINGS_TRIE_
#define _MATCHINGS_TRIE_
#include <memory>
#include <unordered_map>
#include "phrase.h"
#include "phrase_location.h"
using namespace std;
namespace extractor {
/**
* Trie node containing all the occurrences of the corresponding phrase in the
* source data.
*/
struct TrieNode {
TrieNode(shared_ptr<TrieNode> suffix_link = shared_ptr<TrieNode>(),
Phrase phrase = Phrase(),
PhraseLocation matchings = PhraseLocation()) :
suffix_link(suffix_link), phrase(phrase), matchings(matchings) {}
// Adds a trie node as a child of the current node.
void AddChild(int key, shared_ptr<TrieNode> child_node) {
children[key] = child_node;
}
// Checks if a child exists for a given key.
bool HasChild(int key) {
return children.count(key);
}
// Gets the child corresponding to the given key.
shared_ptr<TrieNode> GetChild(int key) {
return children[key];
}
shared_ptr<TrieNode> suffix_link;
Phrase phrase;
PhraseLocation matchings;
unordered_map<int, shared_ptr<TrieNode>> children;
};
/**
* Trie containing all the phrases that can be obtained from a sentence.
*/
class MatchingsTrie {
public:
MatchingsTrie();
virtual ~MatchingsTrie();
// Returns the root of the trie.
shared_ptr<TrieNode> GetRoot() const;
private:
// Recursively deletes a subtree of the trie.
void DeleteTree(shared_ptr<TrieNode> root);
shared_ptr<TrieNode> root;
};
} // namespace extractor
#endif
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