/**
* The property is a simple value list. If property is a list property, the method will check to
* see if the current element has the local list value, if it has, the method returns, otherwise,
* a copy of the list value inherited from container or parent will be set locally on the element
* itself.
*
* <p>This method is supposed to be used when we need to change the value of a composite property(
* a simple list property ). These kind of property is inherited as a whole, so when the value
* changed from a child element. This method will be called to ensure that a local copy will be
* made, so change to the child won't affect the original value in the parent.
*
* @param ref a reference to a list property or member.
*/
private DesignElement makeLocalCompositeValue(
DesignElement topElement, ElementPropertyDefn prop, DesignElement content) {
// Top level property is a list.
Object localValue = topElement.getLocalProperty(module, prop);
if (localValue != null) return content;
// Make a local copy of the inherited list value.
Object inherited = topElement.getProperty(module, prop);
// if the action is add, the inherited can be null.
if (inherited == null) return null;
int index = -1;
if (content != null && inherited instanceof List) index = ((List) inherited).indexOf(content);
Object newValue = ModelUtil.copyValue(prop, inherited);
ActivityStack activityStack = module.getActivityStack();
ContainerContext context = new ContainerContext(topElement, prop.getName());
if (newValue instanceof List) {
List list = new ArrayList();
PropertyRecord propRecord = new PropertyRecord(topElement, prop, list);
activityStack.execute(propRecord);
list = (List) newValue;
for (int i = 0; i < list.size(); i++) {
DesignElement tmpContent = (DesignElement) list.get(i);
ContentRecord addRecord = new ContentRecord(module, context, tmpContent, i);
activityStack.execute(addRecord);
}
} else {
PropertyRecord propRecord = new PropertyRecord(topElement, prop, newValue);
activityStack.execute(propRecord);
}
if (index != -1) return (DesignElement) ((List) newValue).get(index);
return content;
}
private DesignElement matchElement(DesignElement topElement) {
List<Step> steps = eventTarget.stepIterator();
DesignElement tmpElement = topElement;
for (int i = steps.size() - 1; i >= 0; i--) {
Step step = steps.get(i);
PropertyDefn stepPropDefn = step.stepPropDefn;
int index = step.index;
Object stepValue = tmpElement.getLocalProperty(module, (ElementPropertyDefn) stepPropDefn);
if (stepPropDefn.isListType()) {
tmpElement = (DesignElement) ((List) stepValue).get(index);
} else tmpElement = (DesignElement) stepValue;
}
return tmpElement;
}