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DataCache - Simple storage wrapper

Allows JSON data to be persisted easily by user scripts

Ajankohdalta 15.6.2015. Katso uusin versio.

Tätä skriptiä ei tulisi asentaa suoraan. Se on kirjasto muita skriptejä varten sisällytettäväksi metadirektiivillä // @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));
  }
};