}
            if (!directory.canRead()) {
                throw new IllegalArgumentException(String.format("Cache directory %s must be readable", directory));
            }
            if (!directory.canWrite()) {
                throw new IllegalArgumentException(String.format("Cache directory %s must be writable", directory));
            }
        } else {
            if (!directory.mkdirs()) {

            throw ResourceExceptions.getFailed(getURI(), e);
        }
    }

    @Override
    public ExternalResourceWriteResult put(ReadableContent location) {
        try {
            if (!localFile.canWrite()) {
                localFile.delete();
            }
            Files.createParentDirs(localFile);

            try (InputStream input = location.open()) {

            }
            if (!project.getProjectDir().exists() || !project.getProjectDir().isDirectory() || !project.getProjectDir().canWrite()) {
                emitProjectDirectoryMissingWarning(project.getPath(), project.getProjectDir().toString());
            }
        });
    }