Examples with UnDefType org.eclipse.smarthome.core.types.UnDefType used on opensource projects

Example 1 with UnDefType

use of org.eclipse.smarthome.core.types.UnDefType in project smarthome by eclipse.

the class ItemUIRegistryImpl method getLabel.

@Override
public String getLabel(Widget w) {
    String label = getLabelFromWidget(w);
    String itemName = w.getItem();
    if (StringUtils.isBlank(itemName)) {
        return transform(label, null);
    }
    String labelMappedOption = null;
    State state = null;
    StateDescription stateDescription = null;
    String formatPattern = getFormatPattern(label);
    // (i.e. it contains at least a %)
    try {
        final Item item = getItem(itemName);
        // There is a known issue in the implementation of the method getStateDescription() of class Item
        // in the following case:
        // - the item provider returns as expected a state description without pattern but with for
        // example a min value because a min value is set in the item definition but no label with
        // pattern is set.
        // - the channel state description provider returns as expected a state description with a pattern
        // In this case, the result is no display of value by UIs because no pattern is set in the
        // returned StateDescription. What is expected is the display of a value using the pattern
        // provided by the channel state description provider.
        stateDescription = item.getStateDescription();
        if (formatPattern == null && stateDescription != null && stateDescription.getPattern() != null) {
            label = label + " [" + stateDescription.getPattern() + "]";
        }
        String updatedPattern = getFormatPattern(label);
        if (updatedPattern != null) {
            formatPattern = updatedPattern;
            // a number is requested, PercentType must not be converted to DecimalType:
            if (formatPattern.contains("%d") && !(item.getState() instanceof PercentType)) {
                state = item.getStateAs(DecimalType.class);
            } else {
                state = item.getState();
            }
        }
    } catch (ItemNotFoundException e) {
        logger.error("Cannot retrieve item for widget {}", w.eClass().getInstanceTypeName());
    }
    if (formatPattern != null) {
        if (formatPattern.isEmpty()) {
            label = label.substring(0, label.indexOf("[")).trim();
        } else {
            if (state == null || state instanceof UnDefType) {
                formatPattern = formatUndefined(formatPattern);
            } else if (state instanceof Type) {
                // if the channel contains options, we build a label with the mapped option value
                if (stateDescription != null && stateDescription.getOptions() != null) {
                    for (StateOption option : stateDescription.getOptions()) {
                        if (option.getValue().equals(state.toString()) && option.getLabel() != null) {
                            State stateOption = new StringType(option.getLabel());
                            try {
                                String formatPatternOption = stateOption.format(formatPattern);
                                labelMappedOption = label.trim();
                                labelMappedOption = labelMappedOption.substring(0, labelMappedOption.indexOf("[") + 1) + formatPatternOption + "]";
                            } catch (IllegalArgumentException e) {
                                logger.debug("Mapping option value '{}' for item {} using format '{}' failed ({}); mapping is ignored", stateOption, itemName, formatPattern, e.getMessage());
                                labelMappedOption = null;
                            }
                            break;
                        }
                    }
                }
                if (state instanceof QuantityType) {
                    QuantityType<?> quantityState = (QuantityType<?>) state;
                    // sanity convert current state to the item state description unit in case it was updated in the
                    // meantime. The item state is still in the "original" unit while the state description will
                    // display the new unit:
                    Unit<?> patternUnit = UnitUtils.parseUnit(formatPattern);
                    if (patternUnit != null && !quantityState.getUnit().equals(patternUnit)) {
                        quantityState = quantityState.toUnit(patternUnit);
                    }
                    // The widget may define its own unit in the widget label. Convert to this unit:
                    quantityState = convertStateToWidgetUnit(quantityState, w);
                    state = quantityState;
                }
                // This also handles IllegalFormatConversionException, which is a subclass of IllegalArgument.
                try {
                    formatPattern = fillFormatPattern(formatPattern, state);
                } catch (IllegalArgumentException e) {
                    logger.warn("Exception while formatting value '{}' of item {} with format '{}': {}", state, itemName, formatPattern, e.getMessage());
                    formatPattern = new String("Err");
                }
            }
            label = label.trim();
            label = label.substring(0, label.indexOf("[") + 1) + formatPattern + "]";
        }
    }
    return transform(label, labelMappedOption);
}