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package org.macrocloud.kernel.toolkit.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 macro
 */
public class ResourceUtil extends org.springframework.util.ResourceUtils {
	
	/** The Constant HTTP_REGEX. */
	public static final String HTTP_REGEX = "^https?:.+$";
	
	/** The Constant FTP_URL_PREFIX. */
	public static final String FTP_URL_PREFIX = "ftp:";

	/**
	 * 获取资源
	 * 
	 * 支持一下协议：
	 * 

	 * 1. classpath:
	 * 2. file:
	 * 3. ftp:
	 * 4. http: and https:
	 * 5. classpath*:
	 * 6. C:/dir1/ and /Users/lcm
	 * 
	 *
	 * @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)) {
			return new ClassPathResource(resourceLocation);
		}
		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);
	}

}