code: public void clear() {
          // TODO not currently used since EventImpl itself doesn't have a clear
          this.parentMap = null;
          if (null != this.values) {
              for (int i = 0; i < this.values.length; i++) {
                  this.values[i] = null;
              }
              this.values = null;
          }
      }
docs: Clear all content from this map. This will disconnect from any parent
  map as well.