How to use

exists

method

in

org.opensingular.form.SInstance

public static SInstanceViewState get(SInstance instance) {
  if (instance == null)
    return SInstanceViewState.HIDDEN;
  final boolean exists = instance.exists();
  final Boolean visible = SInstances.attributeValue(instance, SPackageBasic.ATR_VISIBLE, null);
  final Boolean enabled = SInstances.attributeValue(instance, SPackageBasic.ATR_ENABLED, null);
  if (exists) {
    if (visible != null && !visible) {
      return SInstanceViewState.HIDDEN;
    } else if (enabled != null && !enabled) {
      return SInstanceViewState.READONLY;
    } else {
      return SInstanceViewState.EDITABLE;
    }
  } else {
    if (visible != null && visible) {
      return SInstanceViewState.READONLY;
    } else {
      return SInstanceViewState.HIDDEN;
    }
  }
}

public void updateExists() {
  SInstances.updateBooleanAttribute(this, SPackageBasic.ATR_EXISTS, SPackageBasic.ATR_EXISTS_FUNCTION);
  if (!exists())
    SInstances.visitPostOrder(this, (i, v) -> i.clearInstance());
}

public static SInstanceViewState get(SInstance instance) {
  if (instance == null)
    return SInstanceViewState.HIDDEN;
  final boolean exists = instance.exists();
  final Boolean visible = SInstances.attributeValue(instance, SPackageBasic.ATR_VISIBLE, null);
  final Boolean enabled = SInstances.attributeValue(instance, SPackageBasic.ATR_ENABLED, null);
  if (exists) {
    if (visible != null && !visible) {
      return SInstanceViewState.HIDDEN;
    } else if (enabled != null && !enabled) {
      return SInstanceViewState.READONLY;
    } else {
      return SInstanceViewState.EDITABLE;
    }
  } else {
    if (visible != null && visible) {
      return SInstanceViewState.READONLY;
    } else {
      return SInstanceViewState.HIDDEN;
    }
  }
}

public void updateExists() {
  SInstances.updateBooleanAttribute(this, SPackageBasic.ATR_EXISTS, SPackageBasic.ATR_EXISTS_FUNCTION);
  if (!exists())
    SInstances.visitPostOrder(this, (i, v) -> i.clearInstance());
}