XingFramework/Relayer

export default class MetaMap {
  constructor() {
    this._metadataMap = new Map();
  }

  _getOrCreateMetadata(target) {
    var metadata = this._metadataMap.get(target);
    if (!metadata) {
      metadata = new Map();
      this._metadataMap.set(target, metadata);
    }
    return metadata;
  }

  defineMetadata(key, value, target) {
    this._getOrCreateMetadata(target).set(key, value);
  }

  hasMetadata(key, target) {
    return this._getOrCreateMetadata(target).has(key)
  }

  getMetadata(key, target) {
    return this._getOrCreateMetadata(target).get(key);
  }

  deleteMetadata(key, target) {
    this._getOrCreateMetadata(target).delete(key);
  }
}