kvstore.cc

// -*- mode: c++; c-file-style: "k&r"; c-basic-offset: 4 -*-
// vim: set ts=4 sw=4:
/***********************************************************************
 *
 * common/kvstore.cc:
 *   Simple versioned key-value store
 *
 **********************************************************************/

#include "kvstore.h"

using namespace std;

KVStore::KVStore() { }
    
KVStore::~KVStore() { }

bool
KVStore::get(const string &key, string &value)
{
    // check for existence of key in store
    if (store.find(key) == store.end() || store[key].empty()) {
        return false;
    } else {
        value = store[key].back();
	return true;
    }
}

bool
KVStore::put(const string &key, const string &value)
{
    store[key].push_back(value);
    return true;
}

/* Delete the latest version of this key. */
bool
KVStore::remove(const string &key, string &value)
{
    if (store.find(key) == store.end() || store[key].empty()) {
        return false;
    } 

    store[key].pop_back();
    return true;
}