Object calculateImpl(final String newName) { // If the name does not match, disconnect and connect if (!Objects.equals(newName, previousName)) { if (currentExpressions != null) { for (DesiredRateExpression<?> desiredRateExpression : currentExpressions) { if (desiredRateExpression != null) { getDirector().disconnectReadExpression(desiredRateExpression); } } } List<DesiredRateExpression<?>> newExpressions = new ArrayList<>(); if (newName != null) { newExpressions.addAll(Collections.nCopies(3, (DesiredRateExpression<?>) null)); } // Connect new expressions if (newName != null) { DesiredRateExpression<?> newExpression = channel(newName, Object.class); getDirector().disconnectReadExpression(newExpression); newExpressions.set(0, newExpression); newExpression = channel(newName + ".LLIM", Object.class); getDirector().disconnectReadExpression(newExpression); newExpressions.set(1, newExpression); newExpression = channel(newName + ".ULIM", Object.class); getDirector().disconnectReadExpression(newExpression); newExpressions.set(2, newExpression); } previousName = newName; currentExpressions = newExpressions; } // No return value if (newName == null) { return null; } // Extract values VNumberArray array = (VNumberArray) currentExpressions.get(0).getFunction().readValue(); VNumber lowerRange = (VNumber) currentExpressions.get(1).getFunction().readValue(); VNumber upperRange = (VNumber) currentExpressions.get(2).getFunction().readValue(); if (array == null || lowerRange == null || upperRange == null) { return null; } return ValueFactory.newVNumberArray( array.getData(), array.getSizes(), Arrays.asList( ValueFactory.newDisplay( VTableFactory.range( lowerRange.getValue().doubleValue(), upperRange.getValue().doubleValue()) .createListNumber(array.getSizes().getInt(0) + 1), "")), array, array, array); }