indexfile.h

/***************************************************************
 *
 * Copyright (C) 1990-2007, Condor Team, Computer Sciences Department,
 * University of Wisconsin-Madison, WI.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ***************************************************************/

#ifndef __CLASSAD_INDEXFILE_H__
#define __CLASSAD_INDEXFILE_H__

#include <fcntl.h>
#include <stdio.h>
#include <string>
#include <map>
#include "classad/classad_stl.h"
#include <sys/types.h>

BEGIN_NAMESPACE( classad )

typedef struct{
    int offset;
} tag; 

struct eqstr
{
    bool operator()(const char* s1, const char* s2) const
    {
        return strcmp(s1, s2) == 0;
    }
};

class IndexFile {
 public:
    void Init(int file_handler);
    bool FindInFile(std::string key,tag &offset);
    bool UpdateIndex(std::string key);
    bool WriteBack(std::string key, std::string ad);  
    //should delete it from file and index
    bool DeleteFromStorageFile(std::string key);
    bool UpdateIndex(std::string key, int offset);
    int First(std::string &key);
    int Next(std::string &key);
    std::string GetClassadFromFile(std::string key, int offset);
    bool  TruncateStorageFile();
    int  dump_index();
 private:
    typedef classad_map<std::string,int> index_type;
    typedef classad_map<std::string,int>::iterator index_itr_type;
    index_type Index;
    index_itr_type index_itr;
    int filed;
};

END_NAMESPACE

#endif //__CLASSAD_INDEXFILE_H__