// Generated by CoffeeScript 1.12.8
(function() {
  Turbolinks.SnapshotCache = (function() {
    var keyForLocation;

    function SnapshotCache(size) {
      this.size = size;
      this.keys = [];
      this.snapshots = {};
    }

    SnapshotCache.prototype.has = function(location) {
      var key;
      key = keyForLocation(location);
      return key in this.snapshots;
    };

    SnapshotCache.prototype.get = function(location) {
      var snapshot;
      if (!this.has(location)) {
        return;
      }
      snapshot = this.read(location);
      this.touch(location);
      return snapshot;
    };

    SnapshotCache.prototype.put = function(location, snapshot) {
      this.write(location, snapshot);
      this.touch(location);
      return snapshot;
    };

    SnapshotCache.prototype.read = function(location) {
      var key;
      key = keyForLocation(location);
      return this.snapshots[key];
    };

    SnapshotCache.prototype.write = function(location, snapshot) {
      var key;
      key = keyForLocation(location);
      return this.snapshots[key] = snapshot;
    };

    SnapshotCache.prototype.touch = function(location) {
      var index, key;
      key = keyForLocation(location);
      index = this.keys.indexOf(key);
      if (index > -1) {
        this.keys.splice(index, 1);
      }
      this.keys.unshift(key);
      return this.trim();
    };

    SnapshotCache.prototype.trim = function() {
      var i, key, len, ref, results;
      ref = this.keys.splice(this.size);
      results = [];
      for (i = 0, len = ref.length; i < len; i++) {
        key = ref[i];
        results.push(delete this.snapshots[key]);
      }
      return results;
    };

    keyForLocation = function(location) {
      return Turbolinks.Location.wrap(location).toCacheKey();
    };

    return SnapshotCache;

  })();

}).call(this);