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DataCache - Simple storage wrapper

Allows JSON data to be persisted easily by user scripts

Fra og med 15.06.2015. Se den nyeste version.

Dette script bør ikke installeres direkte. Det er et bibliotek, som andre scripts kan inkludere med metadirektivet // @require https://update.greasyfork.org/scripts/10443/56961/DataCache%20-%20Simple%20storage%20wrapper.js 

function DataCache(key) {
  this._key = key;
  this._data = {};
  this.load();
}
 
DataCache.prototype = {
  getValue: function(k) {
    return this._data[k];
  },
  setValue: function(k, v) {
    this._data[k] = v;
    this.save();
  },
  deleteValue: function(k) {
    if (k in this._data) {
      delete this._data[k];
      this.save();
    }
  },
  hasValue: function(k) {
    return k in this._data;
  },
  listValues: function() {
    return Object.keys(this._data).sort();
  },
  clear: function() {
    this._data = {};
    this.save();
  },
  save: function() {
    var s = JSON.stringify(this._data);
    GM_setValue(this._key, s);
    console.info('Cache(' + this._key + ') saved: ' + s);
  },
  load: function(s) {
    try {
      this._data = JSON.parse(s || GM_getValue(this._key));
    }
    catch (ex) {
      this.clear();
    }
  },
  edit: function() {
    var res = window.prompt('Edit cached package URLs', JSON.stringify(this._data, null, 2));
    if (res !== null) {
      try {
        this._data = res ? JSON.parse(res) : {};
        this.save();
      }
      catch (ex) {
        console.warn('Failed to update cache data: %s %o', ex.toString(), ex);
      }
    }
  },
  toString: function() {
    return 'Cache(' + this._key + '): [' + this.listValues.join('\n') + ']';
  },
  dump: function() {
    console.log('Cache(' + this._key + '):\n' + JSON.stringify(this._data, null, 2));
  }
};