/**
* Returns true if this element is empty meaning all their attributes have default values and it
* has no descendants.
*
* @return true if the element is empty, false otherwise
*/
private boolean isEmpty() {
Map<String, String> attributesToWrite = attributesToWrite();
if (!attributesToWrite.isEmpty()) {
return false;
}
// if we have children, we are not empty.
return children.isEmpty();
}
/**
* Updates the attribute value.
*
* <p>This would trigger the re-injection of the value.
*/
public void attribute(String name, String value) {
if (value == null) {
attributes.remove(name);
} else {
attributes.put(name, value);
// TODO:
// this re-injection has two problems. First, it forces an instantiation
// even if that hasn't happened yet. Second, if the component is scoped,
// this won't work correctly (but then, there's no way to make that work,
// since we can't enumerate all scope instances.)
getInjector().injectAttribute(this, name, get());
}
}
/**
* Returns the map of attributes names and values for attributes which value is neither null or
* the default value. These attributes are considered having a non default value and must be
* written out.
*
* @return map of attributes indexed by name that must be persisted
*/
private Map<String, String> attributesToWrite() {
Map<String, String> attributesToWrite = new HashMap<String, String>();
Map<String, String> localAttr = new HashMap<String, String>(attributes);
for (Map.Entry<String, String> a : localAttr.entrySet()) {
ConfigModel.AttributeLeaf am = model.attributes.get(a.getKey());
String dv = am.getDefaultValue();
if (dv == null || !dv.equals(a.getValue())) {
attributesToWrite.put(a.getKey(), a.getValue());
}
}
return attributesToWrite;
}
/**
* Obtians the attribute value without variable expansion.
*
* @return null if the attribute is not found.
*/
public String rawAttribute(String name) {
String value = attributes.get(name);
if (value == null && model.attributes.containsKey(name)) {
value = model.attributes.get(name).getDefaultValue();
}
return value;
}
/**
* Copy constructor, used to get a deep copy of the passed instance
*
* @param source the instance to copy
*/
public Dom(Dom source, Dom parent) {
this(source.getHabitat(), source.document, parent, source.model);
List<Child> newChildren = new ArrayList<Child>();
for (Child child : source.children) {
newChildren.add(child.deepCopy(this));
}
setChildren(newChildren);
attributes.putAll(source.attributes);
}
/*package*/ void fillAttributes(XMLStreamReader in) {
for (int i = in.getAttributeCount() - 1; i >= 0; i--) {
String n = in.getAttributeLocalName(i);
if (model.attributes.containsKey(n)) {
if (attributes == null) attributes = new HashMap<String, String>();
attributes.put(n, in.getAttributeValue(i));
}
}
if (attributes == null) attributes = Collections.emptyMap();
}
/**
* Returns the list of attributes with a value on this config instance. This is by definition a
* subset of the attributes names as known to the model {@see ConfigModel.getAttributeNames}.
*
* @return list of attributes names which have values on this config instance
*/
public Set<String> getAttributeNames() {
return Collections.unmodifiableSet(attributes.keySet());
}