| package profiledb.storage; |
| |
| import com.google.gson.Gson; |
| import profiledb.ProfileDB; |
| import profiledb.model.Experiment; |
| |
| import java.io.*; |
| import java.net.URI; |
| import java.util.Collection; |
| import java.util.LinkedList; |
| |
| /** |
| * Controls how conducted experiments will be persisted and loaded |
| */ |
| public abstract class Storage { |
| |
| /** |
| * Object or URI where experiments are persisted |
| */ |
| private URI storageFile; |
| |
| /** |
| * To access profileDB general serialization functions |
| */ |
| private ProfileDB context; |
| |
| /** |
| * Creates a new instance. |
| * @param uri Object or URI where experiments are persisted |
| */ |
| public Storage(URI uri){ |
| this.storageFile = uri; |
| } |
| |
| /** |
| * Sets the ProfileDB for this instance that manages all the Measurement subclasses |
| * */ |
| public void setContext(ProfileDB context) { |
| this.context = context; |
| } |
| |
| /** |
| * Allows to change where future experiments will be persisted and loaded |
| * @param uri |
| */ |
| public void changeLocation(URI uri){ |
| this.storageFile = uri; |
| } |
| |
| public void save(Experiment... experiments) throws IOException {} |
| |
| public void save(Collection<Experiment> experiments) throws IOException {} |
| |
| public void append(Experiment... experiments) throws IOException {} |
| |
| public void append(Collection<Experiment> experiments) throws IOException {} |
| |
| public Collection<Experiment> load() throws IOException { return null; } |
| |
| /** |
| * Write {@link Experiment}s to an {@link OutputStream}. |
| * |
| * @param outputStream the {@link OutputStream} |
| */ |
| public void save(Collection<Experiment> experiments, OutputStream outputStream) throws IOException { |
| try { |
| BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8")); |
| this.save(experiments, writer); |
| } catch (UnsupportedEncodingException e) { |
| throw new RuntimeException("Unexpectedly, UTF-8 is not supported."); |
| } |
| } |
| |
| /** |
| * Write {@link Experiment}s to a {@link Writer}. |
| * |
| * @param writer the {@link Writer} |
| */ |
| public void save(Collection<Experiment> experiments, Writer writer) throws IOException { |
| try { |
| Gson gson = context.getGson(); |
| for (Experiment experiment : experiments) { |
| gson.toJson(experiment, writer); |
| writer.append('\n'); |
| } |
| writer.flush(); |
| } catch (UnsupportedEncodingException e) { |
| throw new RuntimeException("Unexpectedly, UTF-8 is not supported."); |
| } |
| } |
| |
| /** |
| * Load {@link Experiment}s from an {@link InputStream}. |
| * |
| * @param inputStream the {@link InputStream} |
| * @return the {@link Experiment}s |
| */ |
| public Collection<Experiment> load(InputStream inputStream) throws IOException { |
| try { |
| return load(new BufferedReader(new InputStreamReader(inputStream, "UTF-8"))); |
| } catch (UnsupportedEncodingException e) { |
| throw new RuntimeException("Unexpectedly, UTF-8 is not supported."); |
| } |
| } |
| |
| /** |
| * Load {@link Experiment}s from an {@link Reader}. |
| * |
| * @param reader the {@link Reader} |
| * @return the {@link Experiment}s |
| */ |
| public Collection<Experiment> load(BufferedReader reader) throws IOException { |
| Collection<Experiment> experiments = new LinkedList<>(); |
| Gson gson = context.getGson(); |
| String line; |
| while ((line = reader.readLine()) != null) { |
| Experiment experiment = gson.fromJson(line, Experiment.class); |
| experiments.add(experiment); |
| } |
| return experiments; |
| } |
| } |