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import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import java.util.Arrays;
import java.util.List;

/**
 * 资源工具类
 *
 * @author tofuwine
 * @since 2022/06/24
 */
public final class ResourceUtils {

    private ResourceUtils() {

    }

    /**
     * 获取 CLASSPATH 路径下资源文件集合
     * <p>
     * 返回值 {@link Resource} 的 {@link Resource#isFile()} 方法将会返回 {@code false};
     * 对返回值的处理应使用 {@link Resource#getInputStream()}
     * <p>
     * 如果使用了第三方工具类或高版本 JDK 可以替换此方法中的集合转化的方法。 <br/>
     * 例如:
     * <ul>
     *     <li>JDK16+ 可使用 <pre>return Arrays.stream(rpr.getResources(locationPattern)).toList();</pre></li>
     *     <li>集成 Hutool 可使用 <pre>return CollUtil.toList(rpr.getResources(locationPattern));</pre></li>
     * </ul>
     *
     * @param locationPattern 资源文件 Pattern
     * @return 资源集合
     * @author tofuwine
     * @since 2022/06/24
     */
    public static List<Resource> listResources(String locationPattern) {
        try {
            ResourcePatternResolver rpr = new PathMatchingResourcePatternResolver(currentClassLoader());
            return Arrays.asList(rpr.getResources(locationPattern));
        } catch (Exception ex) {
            throw new RuntimeException(ex.getMessage(), ex);
        }
    }

    /**
     * 获取 CLASSPATH 路径下指定资源文件
     *
     * @param location 资源文件路径
     * @return 资源文件
     * @author tofuwine
     * @since 2022/06/24
     */
    public static Resource getResource(String location) {
        try {
            ResourcePatternResolver rpr = new PathMatchingResourcePatternResolver(currentClassLoader());
            return rpr.getResource(location);
        } catch (Exception ex) {
            throw new RuntimeException(ex.getMessage(), ex);
        }
    }

    /**
     * 获取 ClassLoader
     *
     * @author tofuwine
     * @since 2022/06/24
     */
    private static ClassLoader currentClassLoader() {
        return Thread.currentThread().getContextClassLoader();
    }
}