Example usage for java.util Optional get

Introduction

In this page you can find the example usage for java.util Optional get.

Prototype

public T get() 

Source Link

Document

If a value is present, returns the value, otherwise throws NoSuchElementException .

Usage

From source file:com.ikanow.aleph2.aleph2_rest_utils.RestCrudFunctions.java

private static <T> Response handleQueryRequest(final Optional<String> query_json,
        final Optional<String> query_id, final ICrudService<T> crud_service, final Class<T> clazz,
        Optional<Long> limit) {
    //get id or a query object that was posted
    //TODO switch to query_id.map().orElse() ... just making a quick swap for the moment
    if (query_id.isPresent()) {
        //ID query
        try {//  www .j a  v a  2  s .  c  o m
            final String id = query_id.get();
            _logger.debug("id: " + id);
            return Response.ok(RestUtils.convertObjectToJson(crud_service.getObjectById(id).get()).toString())
                    .build();
        } catch (JsonProcessingException | InterruptedException | ExecutionException e) {
            return Response.status(Status.BAD_REQUEST)
                    .entity(ErrorUtils.getLongForm("Error converting input stream to string: {0}", e)).build();
        }
    } else if (query_json.isPresent()) {
        //Body Query
        try {
            final String json = query_json.get();
            _logger.debug("query: " + json);
            final QueryComponent<T> query = RestUtils.convertStringToQueryComponent(json, clazz, limit);
            return Response
                    .ok(RestUtils.convertCursorToJson(crud_service.getObjectsBySpec(query).get()).toString())
                    .build();
        } catch (Exception e) {
            return Response.status(Status.BAD_REQUEST)
                    .entity(ErrorUtils.getLongForm("Error converting input stream to string: {0}", e)).build();
        }
    } else {
        //empty query, does a getall using limit (or 10)
        try {
            _logger.debug("empty query, get all");
            final SingleQueryComponent<T> query = JsonNode.class.isAssignableFrom(clazz)
                    ? (SingleQueryComponent<T>) CrudUtils.allOf()
                    : CrudUtils.allOf(clazz);
            final Cursor<T> cursor = crud_service.getObjectsBySpec(query.limit(limit.orElse(10L))).get();
            return Response.ok(RestUtils.convertCursorToJson(cursor).toString()).build();
        } catch (JsonProcessingException | InterruptedException | ExecutionException e) {
            return Response.status(Status.BAD_REQUEST)
                    .entity(ErrorUtils.getLongForm("Error converting input stream to string: {0}", e)).build();
        }
    }
}

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From source file:net.sf.jabref.model.database.BibDatabase.java

/**
 * Returns the text stored in the given field of the given bibtex entry
 * which belongs to the given database./*w w w . jav a 2s.  com*/
 * <p>
 * If a database is given, this function will try to resolve any string
 * references in the field-value.
 * Also, if a database is given, this function will try to find values for
 * unset fields in the entry linked by the "crossref" field, if any.
 *
 * @param field    The field to return the value of.
 * @param entry    maybenull
 *                 The bibtex entry which contains the field.
 * @param database maybenull
 *                 The database of the bibtex entry.
 * @return The resolved field value or null if not found.
 */
public static String getResolvedField(String field, BibEntry entry, BibDatabase database) {
    if ("bibtextype".equals(field)) {
        return EntryUtil.capitalizeFirst(entry.getType());
    }

    // TODO: Changed this to also consider alias fields, which is the expected
    // behavior for the preview layout and for the check whatever all fields are present.
    // But there might be unwanted side-effects?!
    Optional<String> result = entry.getFieldOrAlias(field);

    // If this field is not set, and the entry has a crossref, try to look up the
    // field in the referred entry: Do not do this for the bibtex key.
    if (!result.isPresent() && (database != null) && !field.equals(BibEntry.KEY_FIELD)) {
        Optional<String> crossrefKey = entry.getFieldOptional(FieldName.CROSSREF);
        if (crossrefKey.isPresent()) {
            Optional<BibEntry> referred = database.getEntryByKey(crossrefKey.get());
            if (referred.isPresent()) {
                // Ok, we found the referred entry. Get the field value from that
                // entry. If it is unset there, too, stop looking:
                result = referred.get().getFieldOptional(field);
            }
        }
    }

    return BibDatabase.getText(result.orElse(null), database);
}

---

From source file:io.github.retz.web.JobRequestHandler.java

static String getFile(spark.Request req, spark.Response res) throws IOException {
    Optional<Job> job = getJobAndVerify(req);

    String file = req.queryParams("path");
    long offset = Long.parseLong(req.queryParams("offset"));
    long length = Long.parseLong(req.queryParams("length"));

    LOG.debug("get-file: path={}, offset={}, length={}", file, offset, length);
    res.type("application/json");

    Optional<FileContent> fileContent;
    if (job.isPresent() && job.get().url() != null // If url() is null, the job hasn't yet been started at Mesos
            && MesosHTTPFetcher.statHTTPFile(job.get().url(), file)) {
        Pair<Integer, String> payload = MesosHTTPFetcher.fetchHTTPFile(job.get().url(), file, offset, length);
        LOG.debug("Payload length={}, offset={}", payload.right().length(), offset);
        // TODO: what the heck happens when a file is not UTF-8 encodable???? How Mesos works?
        if (payload.left() == 200) {
            fileContent = Optional.ofNullable(MAPPER.readValue(payload.right(), FileContent.class));
        } else {/*from www .j a  v a  2s . c o  m*/
            return MAPPER.writeValueAsString(new ErrorResponse(payload.right()));
        }
    } else {
        fileContent = Optional.empty();
    }
    GetFileResponse getFileResponse = new GetFileResponse(job, fileContent);
    getFileResponse.ok();
    res.status(200);

    return MAPPER.writeValueAsString(getFileResponse);
}

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From source file:io.pravega.controller.store.stream.tables.TableHelper.java

/**
 * Current active segments correspond to last entry in the history table.
 * Until segment number is written to the history table it is not exposed to outside world
 * (e.g. callers - producers and consumers)
 *
 * @param historyTable history table/*  www.jav a2  s .c  om*/
 * @return
 */
public static List<Integer> getActiveSegments(final byte[] historyTable) {
    final Optional<HistoryRecord> record = HistoryRecord.readLatestRecord(historyTable, true);

    return record.isPresent() ? record.get().getSegments() : new ArrayList<>();
}

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From source file:com.android.tools.idea.templates.RepositoryUrlManager.java

private static String findExistingExplicitVersion(@NotNull Collection<GradleCoordinate> dependencies) {
    Optional<GradleCoordinate> highest = dependencies.stream()
            .filter(coordinate -> ImportModule.SUPPORT_GROUP_ID.equals(coordinate.getGroupId()))
            .max(COMPARE_PLUS_LOWER);// w w w.jav  a  2s.co  m
    if (!highest.isPresent()) {
        return null;
    }
    String version = highest.get().getRevision();
    if (version.endsWith("+")) {
        return version.length() > 1 ? version.substring(0, version.length() - 1) : null;
    }
    return version;
}

---

From source file:io.pravega.controller.store.stream.tables.TableHelper.java

/**
 * Add a new row to the history table. This row is only partial as it only contains list of segments.
 * Timestamp is added using completeHistoryRecord method.
 *
 * @param historyTable      history table
 * @param newActiveSegments new active segments
 * @return/*from   ww w . jav  a2s  .c om*/
 */
public static byte[] addPartialRecordToHistoryTable(final byte[] historyTable,
        final List<Integer> newActiveSegments) {
    final ByteArrayOutputStream historyStream = new ByteArrayOutputStream();
    Optional<HistoryRecord> last = HistoryRecord.readLatestRecord(historyTable, false);
    assert last.isPresent() && !(last.get().isPartial());

    try {
        historyStream.write(historyTable);
        historyStream.write(new HistoryRecord(last.get().getEpoch() + 1, newActiveSegments, historyTable.length)
                .toBytePartial());
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
    return historyStream.toByteArray();
}

---

From source file:io.pravega.controller.store.stream.tables.TableHelper.java

/**
 * Return segments in the epoch.// ww w . ja  v a 2 s.  c om
 * @param historyTableData history table
 * @param epoch            epoch
 *
 * @return segments in the epoch
 */
public static List<Integer> getSegmentsInEpoch(byte[] historyTableData, int epoch) {
    Optional<HistoryRecord> record = HistoryRecord.readLatestRecord(historyTableData, false);

    while (record.isPresent() && record.get().getEpoch() > epoch) {
        record = HistoryRecord.fetchPrevious(record.get(), historyTableData);
    }

    return record.orElseThrow(() -> StoreException.create(StoreException.Type.DATA_NOT_FOUND,
            "Epoch: " + epoch + " not found in history table")).getSegments();
}

---

From source file:io.pravega.controller.store.stream.tables.TableHelper.java

/**
 * Get active segments at given timestamp.
 * Perform binary search on index table to find the record corresponding to timestamp.
 * Note: index table may be stale or not reflect lastest state of history table.
 * So we may need to fall through in the history table from the record being pointed to by index
 * until we find the correct record./* ww  w  . ja va 2s. c  om*/
 *
 * @param timestamp    timestamp
 * @param indexTable   indextable
 * @param historyTable history table
 * @return
 */
public static List<Integer> getActiveSegments(final long timestamp, final byte[] indexTable,
        final byte[] historyTable) {
    Optional<HistoryRecord> record = HistoryRecord.readRecord(historyTable, 0, true);
    if (record.isPresent() && timestamp > record.get().getScaleTime()) {
        final Optional<IndexRecord> recordOpt = IndexRecord.search(timestamp, indexTable).getValue();
        final int startingOffset = recordOpt.isPresent() ? recordOpt.get().getHistoryOffset() : 0;

        record = findRecordInHistoryTable(startingOffset, timestamp, historyTable, true);
    }
    return record.map(HistoryRecord::getSegments).orElse(new ArrayList<>());
}

---

From source file:io.pravega.controller.store.stream.tables.TableHelper.java

/**
 * Adds timestamp to the last record in the history table.
 *
 * @param historyTable         history table
 * @param partialHistoryRecord partial history record
 * @param timestamp            scale timestamp
 * @return// ww w. j a  va 2s . c om
 */
public static byte[] completePartialRecordInHistoryTable(final byte[] historyTable,
        final HistoryRecord partialHistoryRecord, final long timestamp) {
    Optional<HistoryRecord> record = HistoryRecord.readLatestRecord(historyTable, false);
    assert record.isPresent() && record.get().isPartial()
            && record.get().getEpoch() == partialHistoryRecord.getEpoch();
    final ByteArrayOutputStream historyStream = new ByteArrayOutputStream();

    try {
        historyStream.write(historyTable);

        historyStream
                .write(new HistoryRecord(partialHistoryRecord.getSegments(), partialHistoryRecord.getEpoch(),
                        timestamp, partialHistoryRecord.getOffset()).remainingByteArray());
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
    return historyStream.toByteArray();
}

---

From source file:io.pravega.controller.store.stream.tables.TableHelper.java

/**
 * Segment Table records are of fixed size.
 * So O(constant) operation to get segment given segmentTable Chunk.
 * <p>//from   www.ja  va 2s  .com
 * Note: this method assumes you have supplied the correct chunk
 *
 * @param number       segment number
 * @param segmentTable segment table
 * @return
 */
public static Segment getSegment(final int number, final byte[] segmentTable) {

    Optional<SegmentRecord> recordOpt = SegmentRecord.readRecord(segmentTable, number);
    if (recordOpt.isPresent()) {
        SegmentRecord record = recordOpt.get();
        return new Segment(record.getSegmentNumber(), record.getStartTime(), record.getRoutingKeyStart(),
                record.getRoutingKeyEnd());
    } else {
        throw StoreException.create(StoreException.Type.DATA_NOT_FOUND,
                "Segment number: " + String.valueOf(number));
    }
}

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