@@ -0,0 +1,1146 @@
+/*%0A * Copyright 2017 huangjinfu%0A *%0A * Licensed under the Apache License, Version 2.0 (the %22License%22);%0A * you may not use this file except in compliance with the License.%0A * You may obtain a copy of the License at%0A *%0A *     http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0A%0Apackage cn.hjf.downloader;%0A%0A/**%0A * A util to check parameters which be passed into methods whether valid.%0A *%0A * @author huangjinfu%0A */%0A%0Afinal class CheckUtil %7B%0A%0A    public static void checkNotNull(Object value, String errorMessage) %7B%0A        if (value == null) %7B%0A            throw new IllegalArgumentException(errorMessage);%0A        %7D%0A    %7D%0A%0A    public static void checkStringNotNullOrEmpty(String str, String errorMessage) %7B%0A        if (str == null %7C%7C %22%22.equals(str)) %7B%0A            throw new IllegalArgumentException(errorMessage);%0A        %7D%0A    %7D%0A%7D%0A

Add CheckUtil.