Java tutorial
/* * Copyright (c) 2016, Kasra Faghihi, All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 3.0 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library. */ package com.offbynull.coroutines.instrumenter; import java.util.List; import org.apache.commons.lang3.Validate; final class InternalUtils { private InternalUtils() { // do nothing } @SuppressWarnings("unchecked") static <T extends ContinuationPoint> T validateAndGetContinuationPoint(MethodAttributes attrs, int idx, Class<T> expectedType) { Validate.notNull(attrs); Validate.notNull(expectedType); Validate.isTrue(idx >= 0); List<ContinuationPoint> continuationPoints = attrs.getContinuationPoints(); Validate.isTrue(idx < continuationPoints.size()); ContinuationPoint continuationPoint = continuationPoints.get(idx); Validate.isTrue(expectedType.isAssignableFrom(continuationPoint.getClass())); return (T) continuationPoint; } }