com.xiaoleilu.hutool.io.resource.ClassPathResource Maven / Gradle / Ivy

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package com.xiaoleilu.hutool.io.resource;

import java.net.URL;

import com.xiaoleilu.hutool.io.FileUtil;
import com.xiaoleilu.hutool.io.IORuntimeException;
import com.xiaoleilu.hutool.lang.Assert;
import com.xiaoleilu.hutool.util.ClassUtil;
import com.xiaoleilu.hutool.util.StrUtil;

/**
 * ClassPath资源访问类
 * 
 * @author Looly
 *
 */
public class ClassPathResource extends UrlResource {

	private String path;
	private ClassLoader classLoader;
	private Class clazz;

	// -------------------------------------------------------------------------------------- Constructor start
	/**
	 * 构造
	 * 
	 * @param path 相对于ClassPath的路径
	 */
	public ClassPathResource(String path) {
		this(path, null, null);
	}

	/**
	 * 构造
	 * 
	 * @param path 相对于ClassPath的路径
	 * @param classLoader {@link ClassLoader}
	 */
	public ClassPathResource(String path, ClassLoader classLoader) {
		this(path, classLoader, null);
	}

	/**
	 * 构造
	 * 
	 * @param path 相对于给定Class的路径
	 * @param clazz {@link Class} 用于定位路径
	 */
	public ClassPathResource(String path, Class clazz) {
		this(path, null, clazz);
	}

	/**
	 * 构造
	 * 
	 * @param path 相对路劲
	 * @param classLoader {@link ClassLoader}
	 * @param clazz {@link Class} 用于定位路径
	 */
	public ClassPathResource(String path, ClassLoader classLoader, Class clazz) {
		super((URL) null);
		Assert.notNull(path, "Path must not be null");
		this.path = normalizePath(path);
		this.classLoader = (classLoader != null) ? classLoader : ClassUtil.getClassLoader();
		this.clazz = clazz;
		initUrl();
	}
	// -------------------------------------------------------------------------------------- Constructor end

	/**
	 * 获得Path
	 * 
	 * @return path
	 */
	public final String getPath() {
		return this.path;
	}

	/**
	 * 获得绝对路径Path

	 * 对于不存在的资源，返回拼接后的绝对路径
	 * 
	 * @return 绝对路径path
	 */
	public final String getAbsolutePath() {
		if(FileUtil.isAbsolutePath(this.path)){
			return this.path;
		}
		
		String reultPath = (url != null) ? url.getPath() : ClassUtil.getClassPath() + this.path;
		// return StrUtil.removePrefix(reultPath, PATH_FILE_PRE);
		return reultPath;
	}

	/**
	 * 获得 {@link ClassLoader}
	 * 
	 * @return {@link ClassLoader}
	 */
	public final ClassLoader getClassLoader() {
		return this.classLoader;
	}

	/**
	 * 根据给定资源初始化URL
	 */
	private void initUrl() {
		if (null != this.clazz) {
			super.url = this.clazz.getResource(this.path);
		} else if (null != this.classLoader) {
			super.url = this.classLoader.getResource(this.path);
		} else {
			super.url = ClassLoader.getSystemResource(this.path);
		}
		if (null == super.url) {
			throw new IORuntimeException("Resource of path [{}] not exist!", this.path);
		}
	}

	@Override
	public String toString() {
		return (null == this.path) ? super.toString() : "classpath:" + this.path;
	}

	/**
	 * 标准化Path格式
	 * @param path Path
	 * @return 标准化后的path
	 */
	private String normalizePath(String path) {
		//标准化路径
		path = FileUtil.normalize(path);
		// 兼容Spring风格的ClassPath路径，去除前缀，不区分大小写
		path = StrUtil.removePrefixIgnoreCase(path, "classpath:");
		path = StrUtil.removePrefix(path, StrUtil.SLASH);
		return path;
	}
}