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Android-Download/Aria/src/main/java/com/arialyy/aria/util/CheckUtil.java

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/*
* Copyright (C) 2016 AriaLyy(https://github.com/AriaLyy/Aria)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.arialyy.aria.util;
import android.text.TextUtils;
import android.util.Log;
import com.arialyy.aria.core.DownloadEntity;
import com.arialyy.aria.exception.FileException;
import java.io.File;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Created by Lyy on 2016/9/23.
* 检查帮助类
*/
public class CheckUtil {
private static final String TAG = "CheckUtil";
public static void checkNull(Object obj) {
if (obj == null) throw new IllegalArgumentException("不能传入空对象");
}
/**
* 检查sql的expression是否合法
*/
public static void checkSqlExpression(String... expression) {
if (expression.length == 0) {
throw new IllegalArgumentException("sql语句表达式不能为null");
}
if (expression.length == 1) {
throw new IllegalArgumentException("表达式需要写入参数");
}
String where = expression[0];
if (!where.contains("?")) {
throw new IllegalArgumentException("请在where语句的'='后编写?");
}
Pattern pattern = Pattern.compile("\\?");
Matcher matcher = pattern.matcher(where);
int count = 0;
while (matcher.find()) {
count++;
}
if (count < expression.length - 1){
throw new IllegalArgumentException("条件语句的?个数不能小于参数个数");
}
if (count > expression.length - 1){
throw new IllegalArgumentException("条件语句的?个数不能大于参数个数");
}
}
/**
* 检测下载链接是否为null
*/
public static void checkDownloadUrl(String downloadUrl) {
if (TextUtils.isEmpty(downloadUrl)) throw new IllegalArgumentException("下载链接不能为null");
}
/**
* 检测下载实体是否合法
*
* @param entity 下载实体
* @return 合法(true)
*/
public static boolean checkDownloadEntity(DownloadEntity entity) {
if (entity == null) {
Log.w(TAG, "下载实体不能为空");
return false;
} else if (TextUtils.isEmpty(entity.getDownloadUrl())) {
Log.w(TAG, "下载链接不能为空");
return false;
} else if (TextUtils.isEmpty(entity.getFileName())) {
//Log.w(TAG, "文件名不能为空");
throw new FileException("文件名不能为null");
} else if (TextUtils.isEmpty(entity.getDownloadPath())) {
throw new FileException("文件保存路径不能为null");
}
String fileName = entity.getFileName();
if (fileName.contains(" ")) {
fileName = fileName.replace(" ", "_");
}
String dPath = entity.getDownloadPath();
File file = new File(dPath);
if (file.isDirectory()) {
dPath += fileName;
entity.setDownloadPath(dPath);
}
return true;
}
}