/**
* Ensures a pattern is initialized and active. If the pattern doesn't already exist, one is
* created and (if the activity/fragment is currently started). Otherwise the last created pattern
* is re-used.
*
* <p>In either case, the given callback is associated with the pattern, and will be called as the
* pattern state changes.
*
* @param id A unique identifier for this pattern. Can be whatever you want. Identifiers are
* scoped to a particular PatternManager instance.
* @param args Optional arguments to supply to the pattern at construction. If a pattern already
* exists (a new one does not need to be created), this parameter will be ignored and the last
* arguments continue to be used.
* @param callback Interface the PatternManager will call to report about changes in the state of
* the pattern. Required.
* @return
*/
public Pattern initPattern(int id, Bundle args, PatternCallbacks callback) {
RetainedPatternArray patternArray = getRetainedPatternArray();
if (patternArray == null) {
patternArray = new RetainedPatternArray();
getRetainedFragment().getRetainedSystemInstanceMap().put(KEY, patternArray);
}
Pattern pattern = patternArray.get(id);
if (pattern == null) {
pattern = callback.onCreatePattern(id, args);
patternArray.put(id, pattern);
}
return pattern;
}
/**
* Return the Pattern with the given id or {@code null} if no matching Pattern is found.
*
* @param id A unique identifier for this pattern. Can be whatever you want. Identifiers are
* scoped to a particular PatternManager instance.
* @return The pattern with the given id or {@code null} if no matching Pattern is found.
*/
public Pattern getPattern(int id) {
RetainedPatternArray patternArray = getRetainedPatternArray();
return (patternArray == null ? null : patternArray.get(id));
}