ApplicationService.java

package org.odroid.server.services;

import static com.google.common.base.Preconditions.checkArgument;
import static org.odroid.server.fs.FileSystemUtils.createDir;
import static org.odroid.server.fs.FileSystemUtils.saveFile;
import static org.springframework.util.DigestUtils.md5DigestAsHex;
import static org.springframework.util.StringUtils.isEmpty;

import java.io.File;
import java.io.IOException;
import java.util.List;

import org.odroid.server.dao.ApplicationDAO;
import org.odroid.server.entities.Application;
import org.odroid.server.entities.ApplicationDataType;
import org.odroid.server.exception.ApplicationNotFoundException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
@Transactional
public class ApplicationService {

	// TODO checkIfExists guava, exception hierarchy

	@Autowired
	private ApplicationDAO applicationDAO;

	@Value("${os.filestore}")
	private String APP_FILESTORE;

	public Application createApp(Application app) {
		checkArgument(app.getHash() == null, "Hash mustn't be set!");// TODO
																		// resources
		checkArgument(!isEmpty(app.getName()), "Name must be set");// TODO
																	// resources

		app.setHash(uniqueHash());
		return applicationDAO.persistOrMerge(app);
	}

	private String uniqueHash() {
		String currenTime = String.valueOf(System.nanoTime());
		return new String(md5DigestAsHex(currenTime.getBytes()));
	}

	public Application getApplicationForHash(String hash) {
		Application a = applicationDAO.getApplicationForHash(hash);
		checkIfApplicationExists(a, hash);
		return a;
	}

	public Application lock(String hash) {

		return changeApplicationActiveStatus(hash, Boolean.FALSE);
	}

	public Application unlock(String hash) {
		return changeApplicationActiveStatus(hash, Boolean.TRUE);
	}

	private Application changeApplicationActiveStatus(String hash, Boolean active) {
		Application a = applicationDAO.getApplicationForHash(hash);
		checkIfApplicationExists(a, hash);
		a.setActive(active);
		a = applicationDAO.persistOrMerge(a);
		return a;
	}

	public List<Application> getAllApplications() {
		return applicationDAO.getAllApplications();
	}

	// TODO - co ma zwracać?
	// TODO - dodać walidację, zawartości pliku, może w ApplicationDataType??
	public String addData(String hash, ApplicationDataType type, byte[] data) throws IOException {
		Application a = getApplicationForHash(hash);
		checkIfApplicationExists(a, hash);
		File appDir = createDir(APP_FILESTORE, hash);
		saveFile(appDir.getAbsolutePath(), type.name().toLowerCase(), data);
		return new String(data);
	}

	// TODO Aspect??
	private void checkIfApplicationExists(Application a, String hash) {
		if (a == null) {
			throw new ApplicationNotFoundException("No application found for hash: " + hash);
		}
	}
}