Ecologylab.BigSemantics.MetadataNS.MetadataFieldDescriptor.GetNestedMetadata C# (CSharp) Method

        public IMetadata GetNestedMetadata(IMetadata context)
        {
            return IsScalar ? null : GetNested(context) as IMetadata;
        }

        public int NumberOfVisibleFields(bool considerAlwaysShow = true)
        {
            int size = 0;

            MetaMetadataOneLevelNestingEnumerator fullEnumerator = FullNonRecursiveMetaMetadataIterator();

            // iterate over all fields in this & then in each mixin of this
            while (fullEnumerator.MoveNext())
            {
                MetaMetadataField metaMetadataField = fullEnumerator.Current;
                MetaMetadataField metaMetadata      = fullEnumerator.CurrentObject();        // stays the same for until we
                // iterate over all mfd's for
                // it
                Metadata currentMetadata = fullEnumerator.CurrentMetadata;

                // When the iterator enters the metadata in the mixins "this" in getValueString has to be
                // the corresponding metadata in mixin.
                bool hasVisibleNonNullField = false;
                MetadataFieldDescriptor mfd = metaMetadataField.MetadataFieldDescriptor;

                if (metaMetadata.IsChildFieldDisplayed(metaMetadataField.Name))
                {
                    if (mfd.IsScalar && !mfd.IsCollection)
                    {
                        hasVisibleNonNullField = MetadataString.IsNotNullAndEmptyValue(mfd.GetValueString(currentMetadata));
                    }
                    else if (mfd.IsComposite)
                    {
                        Metadata nestedMetadata = (Metadata)mfd.GetNestedMetadata(currentMetadata);
                        hasVisibleNonNullField = (nestedMetadata != null) ? (nestedMetadata.NumberOfVisibleFields() > 0) : false;
                    }
                    else if (mfd.IsCollection)
                    {
                        ICollection collection = mfd.GetCollection(currentMetadata);
                        hasVisibleNonNullField = (collection != null) ? (collection.Count > 0) : false;
                    }
                }

                // "null" happens with mixins fieldAccessor b'coz getValueString() returns "null".

                // TODO use MetaMetadataField.numNonDisplayedFields()
                bool isVisibleField = !metaMetadataField.Hide &&
                                      ((considerAlwaysShow && metaMetadataField.AlwaysShow) || hasVisibleNonNullField);

                if (isVisibleField)
                {
                    size++;
                }
            }

            return(size);
        }