Example usage for java.util Collections emptySet

Introduction

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

Prototype

@SuppressWarnings("unchecked")
public static final <T> Set<T> emptySet() 

Source Link

Document

Returns an empty set (immutable).

Usage

From source file:edu.cornell.mannlib.vitro.webapp.controller.freemarker.NavigationController.java

protected Set<ValueFactory> getValueFactory(RDFNode valueNode, OntModel displayOntModel) {
    //maybe use jenabean or owl2java for this?
    if (valueNode.isResource()) {
        Resource res = (Resource) valueNode.as(Resource.class);
        Statement stmt = res.getProperty(DisplayVocabulary.JAVA_CLASS_NAME);
        if (stmt == null || !stmt.getObject().isLiteral()) {
            log.debug("Cannot build value factory: java class was " + stmt.getObject());
            return Collections.emptySet();
        }/*from   w  ww .  j  a  va2 s. c  om*/
        String javaClassName = ((Literal) stmt.getObject().as(Literal.class)).getLexicalForm();
        if (javaClassName == null || javaClassName.length() == 0) {
            log.debug("Cannot build value factory: no java class was set.");
            return Collections.emptySet();
        }
        Class<?> clazz;
        Object newObj;
        try {
            clazz = Class.forName(javaClassName);
        } catch (ClassNotFoundException e) {
            log.debug("Cannot build value factory: no class found for " + javaClassName);
            return Collections.emptySet();
        }
        try {
            newObj = clazz.newInstance();
        } catch (Exception e) {
            log.debug("Cannot build value factory: exception while creating object of java class "
                    + javaClassName + " " + e.getMessage());
            return Collections.emptySet();
        }
        if (newObj instanceof ValueFactory) {
            ValueFactory valueFactory = (ValueFactory) newObj;
            return Collections.singleton(valueFactory);
        } else {
            log.debug("Cannot build value factory: " + javaClassName + " does not implement "
                    + ValueFactory.class.getName());
            return Collections.emptySet();
        }
    } else {
        log.debug("Cannot build value factory for " + valueNode);
        return Collections.emptySet();
    }
}

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From source file:ru.org.linux.group.GroupController.java

private List<TopicsListItem> getTopics(Group group, int messagesInPage, boolean lastmod, Integer year,
        Integer month, int topics, int offset, boolean showDeleted, boolean showIgnored,
        @Nullable User currentUser) {/*w  w w  . j  a v  a 2  s.co  m*/
    Set<Integer> ignoreList;

    if (currentUser != null) {
        ignoreList = ignoreListDao.get(currentUser);
    } else {
        ignoreList = Collections.emptySet();
    }

    String delq = showDeleted ? "" : " AND NOT deleted ";

    String q = "SELECT topics.title as subj, lastmod, userid, topics.id as msgid, deleted, topics.stat1, topics.stat3, topics.stat4, topics.sticky, topics.resolved "
            + "FROM topics WHERE NOT sticky AND topics.groupid=" + group.getId() + delq;

    if (year != null) {
        q += " AND postdate>='" + year + '-' + month + "-01'::timestamp AND (postdate<'" + year + '-' + month
                + "-01'::timestamp+'1 month'::interval)";
    }

    String ignq = "";

    if (!showIgnored && currentUser != null) {
        int currentUserId = currentUser.getId();
        if (!ignoreList.isEmpty()) {
            ignq = " AND topics.userid NOT IN (SELECT ignored FROM ignore_list WHERE userid=" + currentUserId
                    + ')';
        }

        if (!currentUser.isModerator()) {
            ignq += " AND topics.id NOT IN (select distinct tags.msgid from tags, user_tags "
                    + "where tags.tagid=user_tags.tag_id and user_tags.is_favorite = false and user_id="
                    + currentUserId + ") ";
        }
    }

    SqlRowSet rs;

    if (!lastmod) {
        if (year == null) {
            if (offset == 0) {
                q += " AND postdate>CURRENT_TIMESTAMP-'3 month'::interval ";
            }

            rs = jdbcTemplate
                    .queryForRowSet(q + ignq + " ORDER BY msgid DESC LIMIT " + topics + " OFFSET " + offset);
        } else {
            rs = jdbcTemplate
                    .queryForRowSet(q + ignq + " ORDER BY msgid DESC LIMIT " + topics + " OFFSET " + offset);
        }
    } else {
        rs = jdbcTemplate
                .queryForRowSet(q + ignq + " ORDER BY lastmod DESC LIMIT " + topics + " OFFSET " + offset);
    }

    return prepareTopic(rs, messagesInPage);
}

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From source file:grakn.core.graql.analytics.MedianVertexProgram.java

@Override
public Set<MessageScope> getMessageScopes(final Memory memory) {
    switch (memory.getIteration()) {
    case 0://  ww w  .ja  v  a 2  s  .  c  o m
        return Sets.newHashSet(messageScopeShortcutIn, messageScopeResourceOut);
    case 1:
        return Collections.singleton(messageScopeShortcutOut);
    default:
        return Collections.emptySet();
    }
}

---

From source file:com.hortonworks.streamline.registries.dashboard.service.DashboardCatalogService.java

public Set<Long> getWidgetDatasourceMapping(Widget widget) {
    List<QueryParam> queryParams = Collections
            .singletonList(new QueryParam(WidgetDatasourceMapping.WIDGET_ID, widget.getId().toString()));
    Collection<WidgetDatasourceMapping> mappings = dao.find(WIDGET_DATASOURCE_MAPPING_NAMESPACE, queryParams);
    if (mappings != null) {
        return mappings.stream().map(WidgetDatasourceMapping::getWidgetId).collect(Collectors.toSet());
    }/*from  ww w  .j a v a  2s.c o m*/
    return Collections.emptySet();
}

---

From source file:com.boundlessgeo.wps.grass.GrassProcesses.java

@Override
public Set<Name> getNames() {
    if (EXEC == null) {
        // do not advertise grass processes if executable is not available
        return Collections.emptySet();
    }/*from  w  w w .  j  a v a 2s  .  c  o  m*/
    return super.getNames();
}

---

From source file:de.tudarmstadt.ukp.dkpro.lexsemresource.wikipedia.WikipediaArticleResource.java

public Set<Entity> getChildren(Entity entity) throws LexicalSemanticResourceException {
    if (!this.containsEntity(entity)) {
        return Collections.emptySet();
    }//from w  w  w.j a  v  a 2 s .c  o  m
    Page p = WikipediaArticleUtils.entityToPage(wiki, entity, isCaseSensitive);
    return WikipediaArticleUtils.pagesToEntities(wiki, p.getOutlinks(), isCaseSensitive);
}

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From source file:jp.co.tis.gsp.tools.dba.s2jdbc.gen.DbTableMetaReaderWithView.java

@Override
protected Set<String> getPrimaryKeySet(DatabaseMetaData metaData, DbTableMeta tableMeta) {
    Set<String> result = new HashSet<String>();
    Dialect gspDialect = DialectUtil.getDialect();
    try {//  w  ww  .j a v a 2  s  . c o  m
        String typeName = getObjectTypeName(metaData, tableMeta);
        String tableName = tableMeta.getName();
        ViewAnalyzer viewAnalyzer = null;
        if (StringUtils.equals(typeName, "VIEW")) {
            String sql = gspDialect.getViewDefinition(metaData.getConnection(), tableName, tableMeta);
            viewAnalyzer = new ViewAnalyzer();
            viewAnalyzer.parse(sql);
            if (viewAnalyzer.isSimple()) {
                tableName = viewAnalyzer.getTableName().toUpperCase();
            } else {
                return Collections.emptySet();
            }
        }
        ResultSet rs = metaData.getPrimaryKeys(tableMeta.getCatalogName(), tableMeta.getSchemaName(),
                tableName);

        try {
            while (rs.next()) {
                result.add(rs.getString("COLUMN_NAME"));
            }
        } finally {
            ResultSetUtil.close(rs);
        }

        if (viewAnalyzer != null && !result.isEmpty()) {
            Set<String> viewPKs = new TreeSet<String>();
            for (String pkColumn : result) {
                if (viewAnalyzer.getColumnNames().contains(pkColumn.toUpperCase())) {
                    String alias = viewAnalyzer.getAlias((pkColumn.toUpperCase()));
                    viewPKs.add(StringUtils.isEmpty(alias) ? pkColumn : alias);
                }
            }
            System.out.println("View Pks" + viewPKs);
            if (viewPKs.size() == result.size())
                return viewPKs;
            else
                return Collections.emptySet();
        }
        return result;
    } catch (SQLException ex) {
        throw new SQLRuntimeException(ex);
    }
}

---

From source file:org.jasig.portlet.blackboardvcportlet.service.impl.LdapUserServiceImpl.java

@Override
public Set<BasicUser> searchForUserByEmail(String email) {
    email = StringUtils.trimToNull(email);
    if (email == null) {
        return Collections.emptySet();
    }// w w w  .  j a  v a  2s . c o m

    final AndFilter andFilter = createBaseFilter();
    andFilter.and(new LikeFilter(mailAttributeName, email + "*"));

    final String searchFilter = andFilter.encode();
    @SuppressWarnings("unchecked")
    final List<BasicUser> results = ldapOperations.search("", searchFilter, basicUserAttributeMapper);

    return Collections.unmodifiableSet(new LinkedHashSet<BasicUser>(results));
}

---

From source file:net.big_oh.algorithms.graph.clique.BronKerboschMaximalCliqueFinder.java

private Set<Set<V>> bronKerbosch1(Set<V> r, Set<V> p, Set<V> x, Graph<V> g, int minCliqueSize,
        int searchDepth) {

    if (logger.isDebugEnabled()) {
        logger.debug("Depth:" + searchDepth + " - R:" + r.size() + " - P:" + p.size() + " - X:" + x.size());
    }/*from w ww. j a v  a 2s .c  om*/

    // base case ...
    // if P and X are both empty, then we're done
    if (p.isEmpty() && x.isEmpty()) {
        if (r.size() >= minCliqueSize) {
            // the maximal clique contained in r is big enough to report
            return Collections.singleton(r);
        } else {
            // the maximal clique contained in r is too small
            return Collections.emptySet();
        }
    }

    // recursive case ...
    Set<Set<V>> maximalCliques = new HashSet<Set<V>>();

    Set<V> pCopy = new HashSet<V>(p);
    for (V v : pCopy) {

        // rPrime = R  {v}
        Set<V> rPrime = new HashSet<V>(r);
        rPrime.add(v);

        // pPrime = P  N(v)
        Set<V> pPrime = new HashSet<V>(p);
        pPrime.retainAll(g.getAllNeighbors(v));

        // xPrime = X  N(v)
        Set<V> xPrime = new HashSet<V>(x);
        xPrime.retainAll(g.getAllNeighbors(v));

        maximalCliques.addAll(bronKerbosch1(rPrime, pPrime, xPrime, g, minCliqueSize, searchDepth + 1));

        // P := P \ {v}
        p.remove(v);

        // X := X  {v}
        x.add(v);

    }

    return maximalCliques;

}

---

From source file:com.netty.file.HttpUploadServerHandler.java

@Override
public void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
    if (msg instanceof HttpRequest) {
        HttpRequest request = this.request = (HttpRequest) msg;
        URI uri = new URI(request.uri());

        if (!uri.getPath().startsWith("/form")) {
            // Write Menu
            writeMenu(ctx);/*from   w ww  . j a  v  a 2s  .  com*/
            return;
        }
        responseContent.setLength(0);
        responseContent.append("WELCOME TO THE WILD WILD WEB SERVER\r\n");
        responseContent.append("===================================\r\n");

        responseContent.append("VERSION: " + request.protocolVersion().text() + "\r\n");

        responseContent.append("REQUEST_URI: " + request.uri() + "\r\n\r\n");
        responseContent.append("\r\n\r\n");

        // new getMethod
        for (Entry<String, String> entry : request.headers()) {
            responseContent.append("HEADER: " + entry.getKey() + '=' + entry.getValue() + "\r\n");
        }
        responseContent.append("\r\n\r\n");

        System.out.println("Helllllllllllllllllloooooooooooooo");

        // new getMethod
        Set<Cookie> cookies;
        String value = request.headers().get(HttpHeaderNames.COOKIE);
        if (value == null) {
            cookies = Collections.emptySet();
        } else {
            cookies = ServerCookieDecoder.STRICT.decode(value);
        }
        for (Cookie cookie : cookies) {
            responseContent.append("COOKIE: " + cookie + "\r\n");
        }
        responseContent.append("\r\n\r\n");

        QueryStringDecoder decoderQuery = new QueryStringDecoder(request.uri());
        Map<String, List<String>> uriAttributes = decoderQuery.parameters();
        for (Entry<String, List<String>> attr : uriAttributes.entrySet()) {
            for (String attrVal : attr.getValue()) {
                responseContent.append("URI: " + attr.getKey() + '=' + attrVal + "\r\n");
            }
        }
        responseContent.append("\r\n\r\n");

        // if GET Method: should not try to create a HttpPostRequestDecoder
        if (request.method().equals(HttpMethod.GET)) {
            // GET Method: should not try to create a HttpPostRequestDecoder
            // So stop here
            responseContent.append("\r\n\r\nEND OF GET CONTENT\r\n");
            // Not now: LastHttpContent will be sent writeResponse(ctx.channel());
            return;
        }
        try {
            decoder = new HttpPostRequestDecoder(factory, request);
        } catch (ErrorDataDecoderException e1) {
            e1.printStackTrace();
            responseContent.append(e1.getMessage());
            writeResponse(ctx.channel());
            ctx.channel().close();
            return;
        }

        readingChunks = HttpUtil.isTransferEncodingChunked(request);
        responseContent.append("Is Chunked: " + readingChunks + "\r\n");
        responseContent.append("IsMultipart: " + decoder.isMultipart() + "\r\n");
        if (readingChunks) {
            // Chunk version
            responseContent.append("Chunks: ");
            readingChunks = true;
        }
    }

    // check if the decoder was constructed before
    // if not it handles the form get
    if (decoder != null) {
        if (msg instanceof HttpContent) {
            // New chunk is received
            HttpContent chunk = (HttpContent) msg;
            try {
                decoder.offer(chunk);
            } catch (ErrorDataDecoderException e1) {
                e1.printStackTrace();
                responseContent.append(e1.getMessage());
                writeResponse(ctx.channel());
                ctx.channel().close();
                return;
            }
            responseContent.append('o');
            // example of reading chunk by chunk (minimize memory usage due to
            // Factory)
            readHttpDataChunkByChunk();
            // example of reading only if at the end
            if (chunk instanceof LastHttpContent) {
                writeResponse(ctx.channel());
                readingChunks = false;

                reset();
            }
        }
    } else {
        writeResponse(ctx.channel());
    }
}

---

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