public IRedefinable getChild(String key) {
if (childrenByKey == null) {
childrenByKey = new HashMap<String, IRedefinable>();
for (IRedefinable child : children) {
childrenByKey.put(child.key(), child);
}
}
return childrenByKey.get(key);
}
/**
* Returns the ancestors of this {@link IRedefinable}, as a list. Lower index = closer ancestor.
*
* @return
*/
protected List<IRedefinable> getAncestors() {
ArrayList<IRedefinable> result = new ArrayList<IRedefinable>();
IRedefinable parent = this.parent;
while (parent != null) {
result.add(parent);
parent = parent.getParent();
}
return result;
}
public <T extends IRedefinable> T getParent(Class<T> parentType) {
IRedefinable parent = this.parent;
while (parent != null) {
if (parentType.isAssignableFrom(parent.getClass())) {
return (T) parent;
}
parent = parent.getParent();
}
return null;
}
/**
* The default implementation redefines all children as well, delegating to the {@link
* #redefineAdded(IRedefinable, IRedefiner)} method if the replacement has a child not present in
* this {@link IRedefinable}.
*/
@Override
public void redefine(IRedefinable replacement, IRedefiner redefiner) {
if (replacement != null && !Util.equals(replacement.key(), key())) {
throw new IllegalArgumentException("Internal error: key mismatch");
}
if (redefiner != null) {
redefiner.changed(this, replacement);
}
HashSet<String> redefined = new HashSet();
for (IRedefinable originalChild : getChildren()) {
String key = originalChild.key();
IRedefinable replacementChild = replacement.getChild(key);
if (replacementChild != null) {
replacementChild.redefine(originalChild, redefiner);
redefined.add(key);
} else {
redefiner.deleted(originalChild);
}
}
for (IRedefinable replaceChild : replacement.getChildren()) {
if (!redefined.contains(replaceChild.key())) {
redefiner.added(replaceChild);
}
}
}
protected AbstractRedefinable(IRedefinable parent, ISourceSupport source) {
this.parent = parent;
this.source = source;
if (parent != null) {
parent.addChild(this);
}
}
/**
* Replaces a child with another. This method uses the key of the replacement to find the child to
* replace. If no such child exists, the replacement is added.
*
* @param replacement
*/
public void replaceChild(IRedefinable replacement) {
if (replacement == null) {
return;
}
boolean wasReplaced = false;
for (int i = 0; i < children.size(); i++) {
IRedefinable child = children.get(i);
if (replacement.key().equals(child.key())) {
children.set(i, replacement);
wasReplaced = true;
}
}
if (!wasReplaced) {
addChild(replacement);
}
childrenByKey = null;
}
public String constructKey(String subkey) {
String parentKey = parent == null ? "" : parent.key();
return parentKey + "/" + subkey;
}
