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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "symbol.h"
#include <vespa/vespalib/data/memory.h>
#include <vespa/vespalib/util/stash.h>
#include <vespa/vespalib/stllike/hash_map.h>
namespace vespalib::slime {
/**
* Maps between strings and symbols.
**/
class SymbolTable
{
private:
struct hasher {
size_t operator () (const Memory & lcm) const {
return hashValue(lcm.data, lcm.size);
}
};
using SymbolMap = hash_map<Memory, Symbol, hasher>;
using SymbolVector = std::vector<Memory>;
Stash _stash;
SymbolMap _symbols;
SymbolVector _names;
public:
using UP = std::unique_ptr<SymbolTable>;
SymbolTable() : SymbolTable(16) {}
explicit SymbolTable(size_t expectedNumSymbols);
SymbolTable(SymbolTable &&) noexcept = default;
SymbolTable & operator=(SymbolTable &&) noexcept = default;
~SymbolTable();
size_t symbols() const noexcept { return _names.size(); }
Memory inspect(const Symbol &symbol) const {
if (symbol.getValue() > _names.size()) {
return Memory();
}
return _names[symbol.getValue()];
}
Symbol insert(const Memory &name);
Symbol lookup(const Memory &name) const;
void clear();
};
}
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