EVOLUTION-MANAGER

Edit File: mem-db.js

"use strict";

var defer = require('../lib/defer.js');
var codec = require('../lib/object-codec.js');
var sha1 = require('git-sha1');

module.exports = mixin;
var isHash = /^[0-9a-f]{40}$/;

function mixin(repo) {
  var objects = {};
  var refs = {};

repo.saveAs = saveAs;
  repo.loadAs = loadAs;
  repo.saveRaw = saveRaw;
  repo.loadRaw = loadRaw;
  repo.hasHash = hasHash;
  repo.readRef = readRef;
  repo.updateRef = updateRef;
  repo.listRefs = listRefs;

function readRef(ref, callback) {
    return makeAsync(function () {
      return refs[ref];
    }, callback);
  }

function updateRef(ref, hash, callback) {
    return makeAsync(function () {
      return (refs[ref] = hash);
    }, callback);
  }

function hasHash(hash, callback) {
    return makeAsync(function () {
      if (!isHash.test(hash)) hash = refs[hash];
      return hash in objects;
    }, callback);
  }

function saveRaw(hash, buffer, callback) {
    return makeAsync(function () {
      objects[hash] = buffer;
    }, callback);
  }

function loadAs(type, hash, callback) {
    return makeAsync(function () {
      if (!isHash.test(hash)) hash = refs[hash];
      var buffer = objects[hash];
      if (!buffer) return [];
      var obj = codec.deframe(buffer, true);
      if (obj.type !== type) throw new TypeError("Type mismatch");
      return obj.body;
    }, callback);
  }

function loadRaw(hash, callback) {
    return makeAsync(function () {
      return objects[hash];
    }, callback);
  }
}