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Rune Common is a java library that is utilised by Rosetta Code Generators and models expressed in the Rosetta DSL.
There is a newer version: 11.27.1
package com.regnosys.rosetta.common.util;

/*-
 * ==============
 * Rune Common
 * ==============
 * Copyright (C) 2018 - 2024 REGnosys
 * ==============
 * 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.
 * ==============
 */

import com.google.common.collect.ImmutableList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.UncheckedIOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.file.FileSystemNotFoundException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class ClassPathUtils {

    private static final Logger LOGGER = LoggerFactory.getLogger(ClassPathUtils.class);

    /**
     * Searches the class path for given directories and returns all files contained in the directory and sub directories filtered by the regexes.
     *
     * @param classPathDirectories List of all the directories to search for in the class path loader.
     * @param includeRegex         Regex file pattern to search files on.
     * @param excludeRegex         Regex file pattern to exclude files on.
     * @param classLoader          Classloader to search in.
     * @return
     */

    public static List findPathsFromClassPath(Collection classPathDirectories, String includeRegex, Optional excludeRegex, ClassLoader classLoader) {
        List modelPaths = classPathDirectories.stream().flatMap(path -> loadFromClasspath(path, classLoader))
                .collect(Collectors.toList());
        List expandedModelPaths = expandPaths(modelPaths, includeRegex, excludeRegex);
        LOGGER.debug("Using paths:" + expandedModelPaths);
        expandedModelPaths.forEach(x -> LOGGER.debug("   " + x));
        return expandedModelPaths;
    }

    public static List findRosettaFilePaths() {
        return findPathsFromClassPath(ImmutableList.of("model", "cdm/rosetta"), ".*\\.rosetta", Optional.empty(), ClassPathUtils.class.getClassLoader());
    }

    /**
     * Includes basictypes.rosetta and annotations.rosetta
     */
    public static List findStaticRosettaFilePaths() {
        return ClassPathUtils.findPathsFromClassPath(ImmutableList.of("model"), ".*\\.rosetta", Optional.empty(), ClassPathUtils.class.getClassLoader());
    }

    public static List expandPaths(Collection paths, String includeRegex, Optional excludeRegex) {
        return paths.stream().flatMap(ClassPathUtils::listFiles)
                .filter(p -> p.getFileName().toString().matches(includeRegex))
                .filter(p -> !excludeRegex.isPresent() || !p.getFileName().toString().matches(excludeRegex.get()))
                .collect(Collectors.toList());
    }

    public static URL getResource(Path path) {
        return getResource(path, ClassPathUtils.class.getClassLoader());
    }

    public static URL getResource(Path path, ClassLoader classLoader) {
        return classLoader.getResource(UrlUtils.toPortableString(path));
    }

    public static Stream loadFromClasspath(String path) {
        return loadFromClasspath(path, ClassPathUtils.class.getClassLoader());
    }

    public static Stream loadFromClasspath(String path, ClassLoader classLoader) {
        List paths = new ArrayList<>();
        try {
            for (URL resource : Collections.list(classLoader.getResources(path))) {
                if (resource.toURI().getScheme().equals("jar")) {
                    try {
                        FileSystems.getFileSystem(resource.toURI());
                    } catch (FileSystemNotFoundException e) {
                        FileSystems.newFileSystem(resource.toURI(), Collections.emptyMap());
                    }
                }
                paths.add(UrlUtils.toPath(resource));
            }
        } catch (URISyntaxException | IOException e) {
            throw new RuntimeException(e);
        }
        return paths.stream();
    }

    public static Path loadSingleFromClasspath(String path) {
        return loadSingleFromClasspath(path, ClassPathUtils.class.getClassLoader());
    }

    public static Path loadSingleFromClasspath(String path, ClassLoader classLoader) {
        try {
            URL resource = classLoader.getResource(path);
            if (resource.toURI().getScheme().equals("jar")) {
                try {
                    FileSystems.getFileSystem(resource.toURI());
                } catch (FileSystemNotFoundException e) {
                    FileSystems.newFileSystem(resource.toURI(), Collections.emptyMap());
                }
            }
            return UrlUtils.toPath(resource);
        } catch (URISyntaxException | IOException e) {
            throw new RuntimeException(e);
        }
    }

    private static List pathsExist(List modelPaths) {
        List nonExistentPaths = modelPaths.stream().filter(p -> !Files.exists(p)).collect(Collectors.toList());
        if (!nonExistentPaths.isEmpty()) {
            throw new IllegalArgumentException("Paths " + nonExistentPaths + " do not exist.");
        }
        return modelPaths;
    }

    private static Stream listFiles(Path path) {
        try {
            return Files.walk(path);
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }
}