Example usage for java.util Collections emptyMap

List of usage examples for java.util Collections emptyMap

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Introduction

In this page you can find the example usage for java.util Collections emptyMap.

Prototype

@SuppressWarnings("unchecked")
public static final <K, V> Map<K, V> emptyMap()

Source Link

Document

Returns an empty map (immutable).

Usage

From source file:com.pactera.edg.am.metamanager.extractor.dao.impl.DBDictionaryDaoImpl.java

public Map<String, List<Map<String, String>>> getColInfoFromMM(List<String> sqlTables) {
    // ?,/*from   ww  w. jav a  2s.  co  m*/
    if (sqlTables == null || sqlTables.size() == 0) {
        return Collections.emptyMap();
    }

    if (!modelHasCheck) {
        // ?
        hasColumnId = checkModel();
        modelHasCheck = true;
    }
    if (!hasColumnId) {
        // columnId,???,!!
        return Collections.emptyMap();
    }

    columnSql = GenSqlUtil.getSql("QUERY_DICTIONARY_COLUMN");
    columnSql = columnSql.replaceAll("#COLUMNPOSITION#", columnPosition);
    // ??
    Collections.sort(sqlTables, new Comparator<String>() {

        public int compare(String o1, String o2) {
            return o1.compareTo(o2);
        }
    });

    // ????,???:schema.table <schema,Set<table>>
    Set<String> schemaTables = verifyTables(sqlTables);
    if (schemaTables.size() == 0) {
        return Collections.emptyMap();
    }

    // ??
    Map<String, List<Map<String, String>>> returnColumns = new HashMap<String, List<Map<String, String>>>();

    // ?SCHEMACODE???

    for (Iterator<String> schemaTableNames = schemaTables.iterator(); schemaTableNames.hasNext();) {
        String schemaTableName = schemaTableNames.next();
        if (schemaTablesCache.containsKey(schemaTableName)) {
            // ,?
            if (schemaTablesCache.get(schemaTableName) == null) {
                // null,?,?
                continue;
            }
            returnColumns.put(schemaTableName, schemaTablesCache.get(schemaTableName));
        } else {
            getTable(schemaTableName, returnColumns);
        }

    }

    if (returnColumns.size() > 0) {
        log.info("???:");
    }
    for (Iterator<String> iter = returnColumns.keySet().iterator(); iter.hasNext();) {
        log.info(iter.next());
    }
    return returnColumns;
}

From source file:com.aiven.seafox.controller.http.volley.toolbox.BasicNetwork.java

@Override
public NetworkResponse performRequest(Request<?> request) throws VolleyError {
    long requestStart = SystemClock.elapsedRealtime();
    while (true) {
        HttpResponse httpResponse = null;
        byte[] responseContents = null;
        Map<String, String> responseHeaders = Collections.emptyMap();
        try {/*w  w w.j a va 2s  . com*/
            // Gather headers.
            Map<String, String> headers = new HashMap<String, String>();
            addCacheHeaders(headers, request.getCacheEntry());
            httpResponse = mHttpStack.performRequest(request, headers);
            StatusLine statusLine = httpResponse.getStatusLine();
            int statusCode = statusLine.getStatusCode();

            responseHeaders = convertHeaders(httpResponse.getAllHeaders());
            // Handle cache validation.
            if (statusCode == HttpStatus.SC_NOT_MODIFIED) {

                Cache.Entry entry = request.getCacheEntry();
                if (entry == null) {
                    return new NetworkResponse(HttpStatus.SC_NOT_MODIFIED, null, responseHeaders, true,
                            SystemClock.elapsedRealtime() - requestStart);
                }

                // A HTTP 304 response does not have all header fields. We
                // have to use the header fields from the cache entry plus
                // the new ones from the response.
                // http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5
                entry.responseHeaders.putAll(responseHeaders);
                return new NetworkResponse(HttpStatus.SC_NOT_MODIFIED, entry.data, entry.responseHeaders, true,
                        SystemClock.elapsedRealtime() - requestStart);
            }

            // Handle moved resources
            if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY
                    || statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {
                String newUrl = responseHeaders.get("Location");
                request.setRedirectUrl(newUrl);
            }

            // Some responses such as 204s do not have content.  We must check.
            if (httpResponse.getEntity() != null) {
                responseContents = entityToBytes(httpResponse.getEntity());
            } else {
                // Add 0 byte response as a way of honestly representing a
                // no-content request.
                responseContents = new byte[0];
            }

            // if the request is slow, log it.
            long requestLifetime = SystemClock.elapsedRealtime() - requestStart;
            logSlowRequests(requestLifetime, request, responseContents, statusLine);

            if (statusCode < 200 || statusCode > 299) {
                throw new IOException();
            }
            return new NetworkResponse(statusCode, responseContents, responseHeaders, false,
                    SystemClock.elapsedRealtime() - requestStart);
        } catch (SocketTimeoutException e) {
            attemptRetryOnException("socket", request, new TimeoutError());
        } catch (ConnectTimeoutException e) {
            attemptRetryOnException("connection", request, new TimeoutError());
        } catch (MalformedURLException e) {
            throw new RuntimeException("Bad URL " + request.getUrl(), e);
        } catch (IOException e) {
            int statusCode = 0;
            NetworkResponse networkResponse = null;
            if (httpResponse != null) {
                statusCode = httpResponse.getStatusLine().getStatusCode();
            } else {
                throw new NoConnectionError(e);
            }
            if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY
                    || statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {
                VolleyLog.e("Request at %s has been redirected to %s", request.getOriginUrl(),
                        request.getUrl());
            } else {
                VolleyLog.e("Unexpected response code %d for %s", statusCode, request.getUrl());
            }
            if (responseContents != null) {
                networkResponse = new NetworkResponse(statusCode, responseContents, responseHeaders, false,
                        SystemClock.elapsedRealtime() - requestStart);
                if (statusCode == HttpStatus.SC_UNAUTHORIZED || statusCode == HttpStatus.SC_FORBIDDEN) {
                    attemptRetryOnException("auth", request, new AuthFailureError(networkResponse));
                } else if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY
                        || statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {
                    attemptRetryOnException("redirect", request, new AuthFailureError(networkResponse));
                } else {
                    // TODO: Only throw ServerError for 5xx status codes.
                    throw new ServerError(networkResponse);
                }
            } else {
                throw new NetworkError(networkResponse);
            }
        }
    }
}

From source file:se.uu.it.cs.recsys.constraint.builder.LevelDomainBuilder.java

public Map<CourseLevel, Set<Integer>> getLevelAndIdMappingFor(Set<Integer> idSet) {
    if (idSet == null || idSet.isEmpty()) {
        LOGGER.warn("Does not make sense to put null or empty set, right?");
        return Collections.emptyMap();
    }/*from w w w.j  a  v a 2  s .c  o m*/

    Map<CourseLevel, Set<Integer>> levelAndIds = new HashMap<>();

    this.courseRepository.findByAutoGenIds(idSet).stream()
            .forEach(course -> checkCourseLevelAndPutToMap(course, levelAndIds));

    return levelAndIds;
}

From source file:edu.cornell.mannlib.vitro.webapp.utils.dataGetter.BrowseDataGetter.java

@Override
public Map<String, Object> getData(Map<String, Object> pageData) {
    try {//from ww w .j  a  v a 2 s .  c o m
        Map params = vreq.getParameterMap();

        Mode mode = getMode(vreq, params);
        switch (mode) {
        case VCLASS_ALPHA:
            return doClassAlphaDisplay(params, vreq, context);
        case CLASS_GROUP:
            return doClassGroupDisplay(params, vreq, context);
        case VCLASS:
            return doClassDisplay(params, vreq, context);
        case ALL_CLASS_GROUPS:
            return doAllClassGroupsDisplay(params, vreq, context);
        default:
            return doAllClassGroupsDisplay(params, vreq, context);
        }
    } catch (Throwable th) {
        log.error(th, th);
        return Collections.emptyMap();
    }
}

From source file:com.zyl.androidvolleyutils.MyBasicNetworkVolley.java

@Override
public NetworkResponse performRequest(Request<?> request) throws VolleyError {
    long requestStart = SystemClock.elapsedRealtime();
    while (true) {
        HttpResponse httpResponse = null;
        byte[] responseContents = null;
        Map<String, String> responseHeaders = Collections.emptyMap();
        try {/*from   w  w  w .j av  a  2  s.c  o  m*/
            // Gather headers.
            Map<String, String> headers = new HashMap<>();
            addCacheHeaders(headers, request.getCacheEntry());

            // Accept-Encoding: gzip
            //            headers.put("Accept-Encoding", "gzip");
            if (headerMap != null) {
                for (Map.Entry<String, String> entry : headerMap.entrySet()) {
                    headers.put(entry.getKey(), entry.getValue());
                }
            }
            // ?
            //headers.put(MyVolley.APP_VERSION_KEY, getVersionCode() + "");
            //??
            //            headers.put(MyVolley.APP_CHANNEL_KEY, MyApp.getInstance().getChannelId());
            //APPID ?
            //            headers.put(MyVolley.APP_JPUSH_ID, Constant.APP_PUSH_TYPE);
            //?platform
            //            headers.put(MyVolley.APP_PLATFORM_KEY, Constant.APP_PLATFORM);
            //osVersion
            //            headers.put(MyVolley.APP_OS_VERSION_KEY, AppUtils.getSystemRelease());
            //?deviceModel
            //            headers.put(MyVolley.APP_DEVICE_MODEL,AppUtils.getModel());
            // MD5?imei
            //            headers.put(MyVolley.APP_DEVICE_ID,AppUtils.getDeviceIdMd5(MyApp.context));
            //??clientVersion
            //            headers.put(MyVolley.APP_CLIENT_VERSION_KEY,AppUtils.getAppVersionName(MyApp.context));

            httpResponse = mHttpStack.performRequest(request, headers);
            StatusLine statusLine = httpResponse.getStatusLine();
            int statusCode = statusLine.getStatusCode();

            responseHeaders = convertHeaders(httpResponse.getAllHeaders());
            // Handle cache validation.
            if (statusCode == HttpStatus.SC_NOT_MODIFIED) {

                Entry entry = request.getCacheEntry();
                if (entry == null) {
                    return new NetworkResponse(HttpStatus.SC_NOT_MODIFIED, null, responseHeaders, true,
                            SystemClock.elapsedRealtime() - requestStart);
                }

                // A HTTP 304 response does not have all header fields. We
                // have to use the header fields from the cache entry plus
                // the new ones from the response.
                // http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5
                entry.responseHeaders.putAll(responseHeaders);
                return new NetworkResponse(HttpStatus.SC_NOT_MODIFIED, entry.data, entry.responseHeaders, true,
                        SystemClock.elapsedRealtime() - requestStart);
            }

            // Some responses such as 204s do not have content.  We must check.
            if (httpResponse.getEntity() != null) {
                responseContents = entityToBytes(httpResponse.getEntity());
            } else {
                // Add 0 byte response as a way of honestly representing a
                // no-content request.
                responseContents = new byte[0];
            }

            // if the request is slow, log it.
            long requestLifetime = SystemClock.elapsedRealtime() - requestStart;
            logSlowRequests(requestLifetime, request, responseContents, statusLine);

            if (statusCode < 200 || statusCode > 299) {
                throw new IOException();
            }
            return new NetworkResponse(statusCode, responseContents, responseHeaders, false,
                    SystemClock.elapsedRealtime() - requestStart);
        } catch (SocketTimeoutException e) {
            attemptRetryOnException("socket", request, new TimeoutError());
        } catch (ConnectTimeoutException e) {
            attemptRetryOnException("connection", request, new TimeoutError());
        } catch (MalformedURLException e) {
            throw new RuntimeException("Bad URL " + request.getUrl(), e);
        } catch (IOException e) {
            int statusCode;
            NetworkResponse networkResponse = null;
            if (httpResponse != null) {
                statusCode = httpResponse.getStatusLine().getStatusCode();
            } else {
                throw new NoConnectionError(e);
            }
            VolleyLog.e("Unexpected response code %d for %s", statusCode, request.getUrl());
            if (responseContents != null) {
                networkResponse = new NetworkResponse(statusCode, responseContents, responseHeaders, false,
                        SystemClock.elapsedRealtime() - requestStart);
                if (statusCode == HttpStatus.SC_UNAUTHORIZED || statusCode == HttpStatus.SC_FORBIDDEN) {
                    attemptRetryOnException("auth", request, new AuthFailureError(networkResponse));
                } else {
                    // TODO: Only throw ServerError for 5xx status codes.
                    throw new ServerError(networkResponse);
                }
            } else {
                throw new NetworkError(networkResponse);
            }
        }
    }
}

From source file:com.ikanow.aleph2.example.flume_harvester.services.FlumeHarvestTechnology.java

@Override
public void onInit(IHarvestContext context) {
    _globals = BeanTemplateUtils.from(Optional.ofNullable(context.getTechnologyLibraryConfig().library_config())
            .orElse(Collections.emptyMap()), FlumeGlobalConfigBean.class).get();
}

From source file:com.ikanow.aleph2.analytics.storm.assets.PassthroughTopology.java

@Override
public Tuple2<Object, Map<String, String>> getTopologyAndConfiguration(final DataBucketBean bucket,
        final IEnrichmentModuleContext context) {
    final TopologyBuilder builder = new TopologyBuilder();

    final Collection<Tuple2<BaseRichSpout, String>> entry_points = context
            .getTopologyEntryPoints(BaseRichSpout.class, Optional.of(bucket));

    //DEBUG//  w  ww. j  ava  2 s .  c o m
    _logger.debug("Passthrough topology: loaded: "
            + entry_points.stream().map(x -> x.toString()).collect(Collectors.joining(":")));

    entry_points.forEach(spout_name -> builder.setSpout(spout_name._2(), spout_name._1()));
    entry_points.stream()
            .reduce(builder.setBolt(BOLT_NAME,
                    context.getTopologyStorageEndpoint(BaseRichBolt.class, Optional.of(bucket))),
                    (acc, v) -> acc.localOrShuffleGrouping(v._2()), (acc1, acc2) -> acc1 // (not possible in practice)
    );

    return Tuples._2T(builder.createTopology(), Collections.emptyMap());
}

From source file:org.elasticsearch.test.NativeRealmIntegTestCase.java

public void setupReservedPasswords(RestClient restClient) throws IOException {
    logger.info("setting up reserved passwords for test");
    {//w ww  .  j  a va2s  .c o m
        String payload = "{\"password\": \"" + new String(reservedPassword.getChars()) + "\"}";
        HttpEntity entity = new NStringEntity(payload, ContentType.APPLICATION_JSON);
        BasicHeader authHeader = new BasicHeader(UsernamePasswordToken.BASIC_AUTH_HEADER,
                UsernamePasswordToken.basicAuthHeaderValue(ElasticUser.NAME, BOOTSTRAP_PASSWORD));
        String route = "/_xpack/security/user/elastic/_password";
        Response response = restClient.performRequest("PUT", route, Collections.emptyMap(), entity, authHeader);
        assertEquals(response.getStatusLine().getReasonPhrase(), 200, response.getStatusLine().getStatusCode());
    }

    for (String username : Arrays.asList(KibanaUser.NAME, LogstashSystemUser.NAME, BeatsSystemUser.NAME)) {
        String payload = "{\"password\": \"" + new String(reservedPassword.getChars()) + "\"}";
        HttpEntity entity = new NStringEntity(payload, ContentType.APPLICATION_JSON);
        BasicHeader authHeader = new BasicHeader(UsernamePasswordToken.BASIC_AUTH_HEADER,
                UsernamePasswordToken.basicAuthHeaderValue(ElasticUser.NAME, reservedPassword));
        String route = "/_xpack/security/user/" + username + "/_password";
        Response response = restClient.performRequest("PUT", route, Collections.emptyMap(), entity, authHeader);
        assertEquals(response.getStatusLine().getReasonPhrase(), 200, response.getStatusLine().getStatusCode());
    }
    logger.info("setting up reserved passwords finished");
}

From source file:com.spotworld.spotapp.widget.utils.volley.toolbox.BasicNetwork.java

@Override
public NetworkResponse performRequest(Request<?> request) throws VolleyError {
    long requestStart = SystemClock.elapsedRealtime();
    while (true) {
        HttpResponse httpResponse = null;
        byte[] responseContents = null;
        Map<String, String> responseHeaders = Collections.emptyMap();
        try {/*from  ww w. j a  va 2s . com*/
            // Gather headers.
            Map<String, String> headers = new HashMap<String, String>();
            addCacheHeaders(headers, request.getCacheEntry());
            httpResponse = mHttpStack.performRequest(request, headers);
            StatusLine statusLine = httpResponse.getStatusLine();
            int statusCode = statusLine.getStatusCode();

            responseHeaders = convertHeaders(httpResponse.getAllHeaders());
            // Handle cache validation.
            if (statusCode == HttpStatus.SC_NOT_MODIFIED) {

                Entry entry = request.getCacheEntry();
                if (entry == null) {
                    return new NetworkResponse(HttpStatus.SC_NOT_MODIFIED, null, responseHeaders, true,
                            SystemClock.elapsedRealtime() - requestStart);
                }

                // A HTTP 304 response does not have all header fields. We
                // have to use the header fields from the cache entry plus
                // the new ones from the response.
                // http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5
                entry.responseHeaders.putAll(responseHeaders);
                return new NetworkResponse(HttpStatus.SC_NOT_MODIFIED, entry.data, entry.responseHeaders, true,
                        SystemClock.elapsedRealtime() - requestStart);
            }

            // Some responses such as 204s do not have content. We must check.
            if (httpResponse.getEntity() != null) {
                responseContents = entityToBytes(httpResponse.getEntity());
            } else {
                // Add 0 byte response as a way of honestly representing a
                // no-content request.
                responseContents = new byte[0];
            }

            // if the request is slow, log it.
            long requestLifetime = SystemClock.elapsedRealtime() - requestStart;
            logSlowRequests(requestLifetime, request, responseContents, statusLine);

            if (statusCode < 200 || statusCode > 299) {
                throw new IOException();
            }
            return new NetworkResponse(statusCode, responseContents, responseHeaders, false,
                    SystemClock.elapsedRealtime() - requestStart);
        } catch (SocketTimeoutException e) {
            attemptRetryOnException("socket", request, new TimeoutError());
        } catch (ConnectTimeoutException e) {
            attemptRetryOnException("connection", request, new TimeoutError());
        } catch (MalformedURLException e) {
            throw new RuntimeException("Bad URL " + request.getUrl(), e);
        } catch (IOException e) {
            int statusCode = 0;
            NetworkResponse networkResponse = null;
            if (httpResponse != null) {
                statusCode = httpResponse.getStatusLine().getStatusCode();
            } else {
                throw new NoConnectionError(e);
            }
            VolleyLog.e("Unexpected response code %d for %s", statusCode, request.getUrl());
            if (responseContents != null) {
                networkResponse = new NetworkResponse(statusCode, responseContents, responseHeaders, false,
                        SystemClock.elapsedRealtime() - requestStart);
                if (statusCode == HttpStatus.SC_UNAUTHORIZED || statusCode == HttpStatus.SC_FORBIDDEN) {
                    attemptRetryOnException("auth", request, new AuthFailureError(networkResponse));
                } else {
                    // TODO: Only throw ServerError for 5xx status codes.
                    throw new ServerError(networkResponse);
                }
            } else {
                throw new NetworkError(networkResponse);
            }
        }
    }
}

From source file:fr.pilato.elasticsearch.crawler.fs.client.ElasticsearchClient.java

public void createIndex(String index, boolean ignoreErrors) throws IOException {
    logger.debug("create index [{}]", index);
    try {/*w  w w .  j  a  va  2  s .  c o m*/
        Response response = client.performRequest("PUT", "/" + index, Collections.emptyMap());
        logger.trace("create index response: {}", response.getEntity().getContent());
    } catch (ResponseException e) {
        if (e.getResponse().getStatusLine().getStatusCode() == 400
                && (e.getMessage().contains("index_already_exists_exception")
                        || e.getMessage().contains("IndexAlreadyExistsException"))) {
            if (!ignoreErrors) {
                throw new RuntimeException("index already exists");
            }
            logger.trace("index already exists. Ignoring error...");
            return;
        }
        throw e;
    }
}