caprese/lib/query.js

Capped Log for Node.js

// Generated by CoffeeScript 1.7.1
(function() {
  var Query;

  Query = (function() {
    Query.prototype._limit = 0;

    Query.prototype._order = 'asc';

    Query.prototype._type = null;

    Query.prototype._date = null;

    function Query(log) {
      this.log = log;
    }

    Query.prototype.asc = function() {
      this._order = 'asc';
      return this;
    };

    Query.prototype.desc = function() {
      this._order = 'desc';
      return this;
    };

    Query.prototype.filter = function(condition) {
      if ((condition != null ? condition.type : void 0) != null) {
        this._type = condition.type;
      } else if ((condition != null ? condition.date : void 0) != null) {
        this._date = condition.date.$gt;
      }
      return this;
    };

    Query.prototype.go = function(callback) {
      var cb, cd, filter, index, item, re, _fn, _i, _len;
      filter = this.log.index.slice(0);
      if (this._type != null) {
        filter = filter.filter((function(_this) {
          return function(item) {
            return item.type === _this._type;
          };
        })(this));
      }
      if (this._date != null) {
        filter = filter.filter((function(_this) {
          return function(item) {
            return item.date > _this._date;
          };
        })(this));
      }
      if (this._order === 'desc') {
        filter.reverse();
      }
      if (this._limit > 0) {
        filter.splice(this._limit, filter.length - this._limit);
      }
      cd = filter.length;
      cb = false;
      re = [];
      if (cd === 0) {
        return callback(null, re);
      }
      _fn = (function(_this) {
        return function(item, index) {
          if (item.length === 0) {
            re[index] = {
              type: item.type,
              message: ''
            };
            if (--cd === 0) {
              cb = true;
              return callback(null, re);
            }
          } else {
            return _this.log.read(item.offset, item.length, function(err, buffer) {
              if (cb) {
                return;
              }
              if (err) {
                cb = true;
                return callback(err);
              }
              re[index] = {
                type: item.type,
                date: item.date,
                message: buffer.toString()
              };
              if (--cd === 0) {
                cb = true;
                return callback(null, re);
              }
            });
          }
        };
      })(this);
      for (index = _i = 0, _len = filter.length; _i < _len; index = ++_i) {
        item = filter[index];
        if (cb) {
          break;
        }
        _fn(item, index);
      }
      return this;
    };

    Query.prototype.limit = function(count) {
      this._limit = count;
      return this;
    };

    Query.prototype.newer = function(date) {
      return this.filter({
        date: {
          $gt: date
        }
      });
    };

    Query.prototype.top = function(count) {
      return this.limit(count);
    };

    Query.prototype.toArray = function(callback) {
      return this.go(callback);
    };

    Query.prototype.where = function(condition) {
      return this.filter(condition);
    };

    return Query;

  })();

  module.exports = Query;

}).call(this);