throw e;
                }

                logger.debug("  Artifact " + artifact.getId() + " resolved to " + artifact.getFile());

                artifact.setResolved(true);
            } else if (!artifact.getFile().exists()) {
                String error = updateCheckManager.getError(artifact, repository);
                if (error != null) {

    private static final String TOUCHFILE_NAME = "resolver-status.properties";

    public boolean isUpdateRequired(Artifact artifact, ArtifactRepository repository) {
        File file = artifact.getFile();

        ArtifactRepositoryPolicy policy = artifact.isSnapshot() ? repository.getSnapshots() : repository.getReleases();

        if (!policy.isEnabled()) {
            if (getLogger().isDebugEnabled()) {

            ArtifactRepository repository) {
        if (metadata != null && metadata.getFile() != null && metadata.getFile().isFile()) {
            try {
                Map<String, ?> options = Collections.singletonMap(MetadataReader.IS_STRICT, Boolean.FALSE);

                Metadata repoMetadata = metadataReader.read(metadata.getFile(), options);

                mergeMetadata(versions, repoMetadata, repository);

            if (conflictingProject != null) {
                throw new DuplicateProjectException(
                        projectId,
                        conflictingProject.getFile(),
                        project.getFile(),
                        "Project '" + projectId + "' is duplicated in the reactor");
            }

        assertArgumentNotNull("url", url);

        final String s = url.getFile();
        return URLUtil.decode(s, "UTF8");
    }

    /**
     * リソースのファイルを返します。
     *
     * @param url
     *            リソースのURL。{@literal null}であってはいけません
     * @return ファイル
     */
    public static File getFile(final URL url) {
        assertArgumentNotNull("url", url);

        return pomRepositories;
    }

    private boolean hasFile(Artifact artifact) {
        return artifact != null
                && artifact.getFile() != null
                && artifact.getFile().exists();
    }

    private List<ArtifactRepository> aggregateRepositories(
            List<ArtifactRepository> requestRepositories, List<ArtifactRepository> pomRepositories) {

        if (artifact == null) {
            return;
        }

        if (Artifact.SCOPE_SYSTEM.equals(artifact.getScope())) {
            File systemFile = artifact.getFile();

            if (systemFile == null) {
                throw new ArtifactNotFoundException("System artifact: " + artifact + " has no file attached", artifact);
            }

        if (artifacts != null && !artifacts.isEmpty()) {
            for (Artifact artifact : artifacts) {
                if (!isProvidedArtifact(artifact) && artifact.getFile() != null) {
                    constituents.add(new ArtifactClassRealmConstituent(artifact));
                } else if (logger.isDebugEnabled()) {
                    logger.debug("  Excluded: {}", getId(artifact));

                        .build();

                activation.os(os);
            }

            org.apache.maven.api.model.ActivationFile modelFile = modelActivation.getFile();

            if (modelFile != null) {
                org.apache.maven.api.settings.ActivationFile file =
                        org.apache.maven.api.settings.ActivationFile.newBuilder()

                if (pomFiles == null) {
                    pomFiles = new ArrayList<>(Arrays.asList(collision.getFile(), project.getFile()));
                    collisions.put(projectId, pomFiles);
                } else {
                    pomFiles.add(project.getFile());
                }
            }
        }

        if (!collisions.isEmpty()) {