private static PropertySheetRow buildProperty()

in application/org.openjdk.jmc.flightrecorder.ui/src/main/java/org/openjdk/jmc/flightrecorder/ui/JfrPropertySheet.java [604:693]
81 lines of code
21 McCabe index (conditional complexity)

	private static <M> PropertySheetRow buildProperty(
		IAttribute<M> attribute, Iterator<? extends IItemIterable> iterables, int maxDistinct) {
		ContentType<M> contentType = attribute.getContentType();
		if (contentType instanceof KindOfQuantity) {
			@SuppressWarnings("unchecked")
			IAttribute<IQuantity> qAttribute = (IAttribute<IQuantity>) attribute;
			IQuantity minValue = null;
			IQuantity maxValue = null;
			while (iterables.hasNext()) {
				IItemIterable ii = iterables.next();
				IMemberAccessor<IQuantity, IItem> accessor = qAttribute.getAccessor(ii.getType());
				Iterator<? extends IItem> items = ii.iterator();
				while (items.hasNext()) {
					IQuantity val = accessor.getMember(items.next());
					if (val == null) {
						// FIXME: Should null values be expected/accepted?
//						FlightRecorderUI.getDefault().getLogger().warning("Null value in " + qAttribute.getIdentifier() + " field"); //$NON-NLS-1$ //$NON-NLS-2$
					} else if (minValue == null) {
						minValue = maxValue = val;
					} else {
						minValue = QuantitiesToolkit.min(val, minValue);
						maxValue = QuantitiesToolkit.max(val, maxValue);
					}
				}
			}

			if (minValue != null) {
				if (minValue == maxValue) {
					return new PropertySheetRow(qAttribute, minValue);
				} else {
					return new PropertySheetRow(qAttribute, QuantityRange.createWithEnd(minValue, maxValue));
				}
			}
		} else if (contentType instanceof RangeContentType) {
			if (((RangeContentType<?>) contentType).getEndPointContentType() instanceof KindOfQuantity) {
				@SuppressWarnings("unchecked")
				IAttribute<IRange<IQuantity>> rangeAttribute = (IAttribute<IRange<IQuantity>>) attribute;
				IQuantity minValue = null;
				IQuantity maxValue = null;
				while (iterables.hasNext()) {
					IItemIterable ii = iterables.next();
					IMemberAccessor<IRange<IQuantity>, IItem> accessor = rangeAttribute.getAccessor(ii.getType());
					Iterator<? extends IItem> items = ii.iterator();
					while (items.hasNext()) {
						IRange<IQuantity> range = accessor.getMember(items.next());
						if (range == null) {
							// FIXME: Should null values be expected/accepted?
//							FlightRecorderUI.getDefault().getLogger().warning("Null value in " + rangeAttribute.getIdentifier() + " field"); //$NON-NLS-1$ //$NON-NLS-2$
						} else if (minValue == null) {
							minValue = range.getStart();
							maxValue = range.getEnd();
						} else {
							minValue = QuantitiesToolkit.min(range.getStart(), minValue);
							maxValue = QuantitiesToolkit.max(range.getEnd(), maxValue);
						}
					}
				}

				if (minValue != null) {
					if (minValue == maxValue) {
						return new PropertySheetRow(rangeAttribute, minValue);
					} else {
						return new PropertySheetRow(rangeAttribute, QuantityRange.createWithEnd(minValue, maxValue));
					}
				}
			}
		}

		Set<M> keys = new HashSet<>();
		while (iterables.hasNext()) {
			IItemIterable ii = iterables.next();
			IMemberAccessor<M, IItem> accessor = attribute.getAccessor(ii.getType());
			Iterator<? extends IItem> items = ii.iterator();
			while (items.hasNext()) {
				if (keys.size() > maxDistinct) {
					return new PropertySheetRow(attribute, TOO_MANY_VALUES);
				}
				// FIXME: Add more limitations if there are a lot of items?
				keys.add(accessor.getMember(items.next()));
			}
		}
		if (keys.size() == 0) {
			return null;
		} else if (keys.size() == 1) {
			return new PropertySheetRow(attribute, keys.iterator().next());
		} else {
			return new PropertySheetRow(attribute, keys);
		}

	}