public String getSourceName() {
        return "SDKMAN!";
    }

    @Override
    public Set<InstallationLocation> get() {
        return findJavaCandidates(toolchainConfiguration.getSdkmanCandidatesDirectory());
    }

    private Set<InstallationLocation> findJavaCandidates(File candidatesDir) {
        final File root = new File(candidatesDir, "java");

    public String getSourceName() {
        return "asdf-vm";
    }

    @Override
    public Set<InstallationLocation> get() {
        return findJavaCandidates(toolchainConfiguration.getAsdfDataDirectory());
    }

    private Set<InstallationLocation> findJavaCandidates(File candidatesDir) {
        final File root = new File(candidatesDir, "installs/java");

    public String getSourceName() {
        return "Jabba";
    }

    @Override
    public Set<InstallationLocation> get() {
        return findJavaCandidates(toolchainConfiguration.getJabbaHomeDirectory());
    }

    private Set<InstallationLocation> findJavaCandidates(@Nullable File candidatesDir) {
        if (candidatesDir != null) {
            final File root = new File(candidatesDir, "jdk");