/**
* Gets the specified method from a query module.
*
* @param mod query module object
* @param path path of the module
* @param name method name
* @param arity number of arguments
* @param qc query context
* @param ii input info
* @return method if found, {@code null} otherwise
* @throws QueryException query exception
*/
private static Method getModMethod(
final Object mod,
final String path,
final String name,
final long arity,
final QueryContext qc,
final InputInfo ii)
throws QueryException {
// find method with identical name and arity
Method meth = null;
for (final Method m : mod.getClass().getMethods()) {
if (m.getName().equals(name) && m.getParameterTypes().length == arity) {
if (meth != null) throw JAVAAMBIG_X.get(ii, "Q{" + path + '}' + name + '#' + arity);
meth = m;
}
}
if (meth == null) throw FUNCJAVA_X.get(ii, path + ':' + name);
// check if user has sufficient permissions to call the function
Perm perm = Perm.ADMIN;
final QueryModule.Requires req = meth.getAnnotation(QueryModule.Requires.class);
if (req != null) perm = Perm.get(req.value().name());
if (!qc.context.user.has(perm)) return null;
// Add module locks to QueryContext.
final QueryModule.Lock lock = meth.getAnnotation(QueryModule.Lock.class);
if (lock != null) {
for (final String read : lock.read()) qc.readLocks.add(DBLocking.MODULE_PREFIX + read);
for (final String write : lock.write()) qc.writeLocks.add(DBLocking.MODULE_PREFIX + write);
}
return meth;
}
/**
* Returns the maximum permission from the specified commands.
*
* @param cmds commands to be checked
* @return permission
*/
private static Perm max(final ArrayList<Command> cmds) {
Perm p = Perm.NONE;
for (final Command c : cmds) p = p.max(c.perm);
return p;
}