code: public void addElementCollectionMetadata(CollectionColumnInfo elementCollectionMetadata)
      {
          if (this.elementCollectionMetadatas == null)
          {
              this.elementCollectionMetadatas = new ArrayList<CollectionColumnInfo>();
          }
  
          if (!elementCollectionMetadatas.contains(elementCollectionMetadata))
          {
              elementCollectionMetadatas.add(elementCollectionMetadata);
          }
      }
docs: Adds the element collection metadata.
  
  @param elementCollectionMetadata
  the element collection metadata