/**
 * BladeX Commercial License Agreement
 * Copyright (c) 2018-2099, https://bladex.cn. All rights reserved.
 * <p>
 * Use of this software is governed by the Commercial License Agreement
 * obtained after purchasing a license from BladeX.
 * <p>
 * 1. This software is for development use only under a valid license
 * from BladeX.
 * <p>
 * 2. Redistribution of this software's source code to any third party
 * without a commercial license is strictly prohibited.
 * <p>
 * 3. Licensees may copyright their own code but cannot use segments
 * from this software for such purposes. Copyright of this software
 * remains with BladeX.
 * <p>
 * Using this software signifies agreement to this License, and the software
 * must not be used for illegal purposes.
 * <p>
 * THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY. The author is
 * not liable for any claims arising from secondary or illegal development.
 * <p>
 * Author: DreamLu (596392912@qq.com)
 */
package org.springblade.core.tool.utils;

import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.UrlResource;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.util.Assert;

import java.io.IOException;

/**
 * 资源工具类
 *
 * @author L.cm
 */
public class ResourceUtil extends org.springframework.util.ResourceUtils {
	public static final String HTTP_REGEX = "^https?:.+$";
	public static final String FTP_URL_PREFIX = "ftp:";

	/**
	 * 获取资源
	 * <p>
	 * 支持一下协议：
	 * <p>
	 * 1. classpath:
	 * 2. file:
	 * 3. ftp:
	 * 4. http: and https:
	 * 5. classpath*:
	 * 6. C:/dir1/ and /Users/lcm
	 * </p>
	 *
	 * @param resourceLocation 资源路径
	 * @return {Resource}
	 * @throws IOException IOException
	 */
	public static Resource getResource(String resourceLocation) throws IOException {
		Assert.notNull(resourceLocation, "Resource location must not be null");
		if (resourceLocation.startsWith(CLASSPATH_URL_PREFIX)) {
			String path = resourceLocation.substring(CLASSPATH_URL_PREFIX.length());
			return new ClassPathResource(path);
		}
		if (resourceLocation.startsWith(FTP_URL_PREFIX)) {
			return new UrlResource(resourceLocation);
		}
		if (resourceLocation.matches(HTTP_REGEX)) {
			return new UrlResource(resourceLocation);
		}
		if (resourceLocation.startsWith(ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX)) {
			return SpringUtil.getContext().getResource(resourceLocation);
		}
		return new FileSystemResource(resourceLocation);
	}

}
