#include "CLucene/StdHeader.h"
#include "TokenList.h"

#include "CLucene/util/VoidMap.h"
#include "CLucene/util/VoidList.h"
#include "QueryToken.h"

namespace lucene{ namespace queryParser{
    TokenList::TokenList()
    {
    }
    TokenList::~TokenList(){
    tokens.setDoDelete(DELETE_TYPE_DELETE);
      tokens.clear();
    }

    void TokenList::Add(QueryToken* token)
    {
      tokens.push_front(token);
    }

    void TokenList::Push(QueryToken* token)
    {
      tokens.push_back(token);
    }

    QueryToken& TokenList::Peek()
    {
      /* DSR:CL_BUG: Sometimes code internal to CLucene 0.8.11 called Peek()
      ** when this->tokens was empty, resulting in an invalid memory operation
      ** (i.e., accessing tokens[-1]).  For example,
      ** QueryParser::parse("!", ..., ...) triggered this bug. */
      if (Count() == 0) {
        _THROWC("TokenList::Peek called when Count() == 0");
      }
      return *tokens[tokens.size()-1];
    }

    QueryToken& TokenList::Extract()
    {
      QueryToken& token = Peek();
      tokens.pop_back();
      return token;
    }

    int_t TokenList::Count()
    {
      return tokens.size();
    }
}}