compat/maven-compat/src/main/java/org/apache/maven/repository/legacy/LegacyRepositorySystem.java [334:388]:
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    public List<ArtifactRepository> getEffectiveRepositories(List<ArtifactRepository> repositories) {
        if (repositories == null) {
            return null;
        }

        Map<String, List<ArtifactRepository>> reposByKey = new LinkedHashMap<>();

        for (ArtifactRepository repository : repositories) {
            String key = repository.getId();

            List<ArtifactRepository> aliasedRepos = reposByKey.computeIfAbsent(key, k -> new ArrayList<>());

            aliasedRepos.add(repository);
        }

        List<ArtifactRepository> effectiveRepositories = new ArrayList<>();

        for (List<ArtifactRepository> aliasedRepos : reposByKey.values()) {
            List<ArtifactRepository> mirroredRepos = new ArrayList<>();

            List<ArtifactRepositoryPolicy> releasePolicies = new ArrayList<>(aliasedRepos.size());

            for (ArtifactRepository aliasedRepo : aliasedRepos) {
                releasePolicies.add(aliasedRepo.getReleases());
                mirroredRepos.addAll(aliasedRepo.getMirroredRepositories());
            }

            ArtifactRepositoryPolicy releasePolicy = getEffectivePolicy(releasePolicies);

            List<ArtifactRepositoryPolicy> snapshotPolicies = new ArrayList<>(aliasedRepos.size());

            for (ArtifactRepository aliasedRepo : aliasedRepos) {
                snapshotPolicies.add(aliasedRepo.getSnapshots());
            }

            ArtifactRepositoryPolicy snapshotPolicy = getEffectivePolicy(snapshotPolicies);

            ArtifactRepository aliasedRepo = aliasedRepos.get(0);

            ArtifactRepository effectiveRepository = createArtifactRepository(
                    aliasedRepo.getId(), aliasedRepo.getUrl(), aliasedRepo.getLayout(), snapshotPolicy, releasePolicy);

            effectiveRepository.setAuthentication(aliasedRepo.getAuthentication());

            effectiveRepository.setProxy(aliasedRepo.getProxy());

            effectiveRepository.setMirroredRepositories(mirroredRepos);

            effectiveRepository.setBlocked(aliasedRepo.isBlocked());

            effectiveRepositories.add(effectiveRepository);
        }

        return effectiveRepositories;
    }
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impl/maven-core/src/main/java/org/apache/maven/bridge/MavenRepositorySystem.java [603:657]:
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    public List<ArtifactRepository> getEffectiveRepositories(List<ArtifactRepository> repositories) {
        if (repositories == null) {
            return null;
        }

        Map<String, List<ArtifactRepository>> reposByKey = new LinkedHashMap<>();

        for (ArtifactRepository repository : repositories) {
            String key = repository.getId();

            List<ArtifactRepository> aliasedRepos = reposByKey.computeIfAbsent(key, k -> new ArrayList<>());

            aliasedRepos.add(repository);
        }

        List<ArtifactRepository> effectiveRepositories = new ArrayList<>();

        for (List<ArtifactRepository> aliasedRepos : reposByKey.values()) {
            List<ArtifactRepository> mirroredRepos = new ArrayList<>();

            List<ArtifactRepositoryPolicy> releasePolicies = new ArrayList<>(aliasedRepos.size());

            for (ArtifactRepository aliasedRepo : aliasedRepos) {
                releasePolicies.add(aliasedRepo.getReleases());
                mirroredRepos.addAll(aliasedRepo.getMirroredRepositories());
            }

            ArtifactRepositoryPolicy releasePolicy = getEffectivePolicy(releasePolicies);

            List<ArtifactRepositoryPolicy> snapshotPolicies = new ArrayList<>(aliasedRepos.size());

            for (ArtifactRepository aliasedRepo : aliasedRepos) {
                snapshotPolicies.add(aliasedRepo.getSnapshots());
            }

            ArtifactRepositoryPolicy snapshotPolicy = getEffectivePolicy(snapshotPolicies);

            ArtifactRepository aliasedRepo = aliasedRepos.get(0);

            ArtifactRepository effectiveRepository = createArtifactRepository(
                    aliasedRepo.getId(), aliasedRepo.getUrl(), aliasedRepo.getLayout(), snapshotPolicy, releasePolicy);

            effectiveRepository.setAuthentication(aliasedRepo.getAuthentication());

            effectiveRepository.setProxy(aliasedRepo.getProxy());

            effectiveRepository.setMirroredRepositories(mirroredRepos);

            effectiveRepository.setBlocked(aliasedRepo.isBlocked());

            effectiveRepositories.add(effectiveRepository);
        }

        return effectiveRepositories;
    }
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