Examples of org.hsqldb.lib.HashSet

org.hsqldb.lib.HashSet
This class does not store null keys. @author Fred Toussi (fredt@users dot sourceforge.net) @version 1.9.0 @since 1.7.2


        //
        PersistentStore store = session.sessionData.getRowStore(t);
        DataFileCache   cache = null;
        Object[]        row;
        HashSet         cacheSet;
        Iterator        caches;
        Iterator        tables;
        Table           table;
        int             iFreeBytes;
        int             iLargestFreeItem;
        long            lSmallestFreeItem;


        // Initialization
        cacheSet = new HashSet();


        // dynamic system tables are never cached
        tables =
            database.schemaManager.databaseObjectIterator(SchemaObject.TABLE);


        while (tables.hasNext()) {
            table = (Table) tables.next();


            PersistentStore currentStore = session.sessionData.getRowStore(t);


            if (session.getGrantee().isFullyAccessibleByRole(
                    table.getName())) {
                if (currentStore != null) {
                    cache = currentStore.getCache();
                }


                if (cache != null) {
                    cacheSet.add(cache);
                }
            }
        }


        caches = cacheSet.iterator();


        // Do it.
        while (caches.hasNext()) {
            cache = (DataFileCache) caches.next();
            row   = t.getEmptyRowData();

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                    if (rangeIndex == -1) {
                        throw Error.error(ErrorCode.X_42501, tablename);
                    }


                    RangeVariable range   = rangeVariables[rangeIndex];
                    HashSet       exclude = getAllNamedJoinColumns();


                    range.addTableColumns(e, exclude);
                }


                for (int i = 0; i < e.nodes.length; i++) {

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        return expression;
    }


    private HashSet getAllNamedJoinColumns() {


        HashSet set = null;


        for (int i = 0; i < rangeVariableList.size(); i++) {
            RangeVariable range = (RangeVariable) rangeVariableList.get(i);


            if (range.namedJoinColumns != null) {
                if (set == null) {
                    set = new HashSet();
                }


                set.addAll(range.namedJoinColumns);
            }
        }


        return set;
    }

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    }


    public Expression getEquiJoinExpressions(OrderedHashSet nameSet,
            RangeVariable rightRange, boolean fullList) {


        HashSet        set             = new HashSet();
        Expression     result          = null;
        OrderedHashSet joinColumnNames = new OrderedHashSet();


        for (int i = 0; i < rangeVariableList.size(); i++) {
            RangeVariable  range = (RangeVariable) rangeVariableList.get(i);
            HashMappedList columnList = range.rangeTable.columnList;


            for (int j = 0; j < columnList.size(); j++) {
                ColumnSchema column       = (ColumnSchema) columnList.get(j);
                String       name         = range.getColumnAlias(j);
                boolean      columnInList = nameSet.contains(name);
                boolean namedJoin = range.namedJoinColumns != null
                                    && range.namedJoinColumns.contains(name);
                boolean repeated = !namedJoin && !set.add(name);


                if (repeated && (!fullList || columnInList)) {
                    throw Error.error(ErrorCode.X_42578, name);
                }

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    private static void deRegisterServer(Server server, Database db) {


        Iterator it = serverMap.values().iterator();


        for (; it.hasNext(); ) {
            HashSet databases = (HashSet) it.next();


            databases.remove(db);


            if (databases.isEmpty()) {
                it.remove();
            }
        }
    }

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     * Registers a server as serving a given database.
     */
    private static void registerServer(Server server, Database db) {


        if (!serverMap.containsKey(server)) {
            serverMap.put(server, new HashSet());
        }


        HashSet databases = (HashSet) serverMap.get(server);


        databases.add(db);
    }

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        Iterator it = serverMap.keySet().iterator();


        for (; it.hasNext(); ) {
            Server  server    = (Server) it.next();
            HashSet databases = (HashSet) serverMap.get(server);


            if (databases.contains(db)) {
                server.notify(ServerConstants.SC_DATABASE_SHUTDOWN,
                              db.databaseID);
            }
        }
    }

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        Iterator it = serverMap.keySet().iterator();


        for (; it.hasNext(); ) {
            Server  server    = (Server) it.next();
            HashSet databases = (HashSet) serverMap.get(server);


            if (databases.contains(db)) {
                return true;
            }
        }


        return false;

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        if (handlers.length == 0) {
            return;
        }


        HashSet           statesSet = new HashSet();
        OrderedIntHashSet typesSet  = new OrderedIntHashSet();


        for (int i = 0; i < handlers.length; i++) {
            int[] types = handlers[i].getConditionTypes();


            for (int j = 0; j < types.length; j++) {
                if (!typesSet.add(types[j])) {
                    throw Error.error(ErrorCode.X_42601);
                }
            }


            String[] states = handlers[i].getConditionStates();


            for (int j = 0; j < states.length; j++) {
                if (!statesSet.add(states[j])) {
                    throw Error.error(ErrorCode.X_42601);
                }
            }
        }
    }

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        }
    }


    void materializeSubQueries(Session session) {


        HashSet subqueryPopFlags = new HashSet();


        for (int i = 0; i < subqueries.length; i++) {
            SubQuery sq = subqueries[i];


            // VIEW working tables may be reused in a single query but they are filled only once
            if (!subqueryPopFlags.add(sq)) {
                continue;
            }


            if (!sq.isCorrelated()) {
                sq.materialise(session);

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