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package org.hsqldb.navigator;

import org.hsqldb.HsqlException;
import org.hsqldb.QueryExpression;
import org.hsqldb.QuerySpecification;
import org.hsqldb.Row;
import org.hsqldb.Session;
import org.hsqldb.SortAndSlice;
import org.hsqldb.Table;
import org.hsqldb.TableBase;
import org.hsqldb.lib.ArrayUtil;
import org.hsqldb.persist.PersistentStore;
import org.hsqldb.result.ResultMetaData;
import org.hsqldb.rowio.RowInputInterface;
import org.hsqldb.rowio.RowOutputInterface;

/**
 * Implementation of RowSetNavigator using a table as the data store.
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.7.4
 * @since 1.9.0
 */
public class RowSetNavigatorDataTable extends RowSetNavigatorData {

    public TableBase       table;
    public PersistentStore store;
    RowIterator            iterator;
    int                    iteratorPos = -1;
    Object[]               tempRowData;

    public RowSetNavigatorDataTable(
            Session session,
            QuerySpecification select) {

        super(session, select.sortAndSlice);

        rangePosition      = select.resultRangePosition;
        visibleColumnCount = select.indexLimitVisible;
        table              = select.resultTable.duplicate();
        store = session.sessionData.getNewResultRowStore(
            table,
            !select.isAggregated);
        table.store        = store;
        isAggregate        = select.isAggregated;
        isSimpleAggregate  = select.isAggregated && !select.isGrouped;
        reindexTable       = select.isGrouped;
        mainIndex          = select.mainIndex;
        fullIndex          = select.fullIndex;
        orderIndex         = select.orderIndex;
        groupIndex         = select.groupIndex;
        idIndex            = select.idIndex;
        rowNumIndex        = select.rowNumIndex;
        tempRowData        = new Object[1];
    }

    public RowSetNavigatorDataTable(
            Session session,
            QuerySpecification select,
            RowSetNavigatorData navigator) {

        this(session, select);

        navigator.reset();

        while (navigator.next()) {
            add(navigator.getCurrent());
        }
    }

    public RowSetNavigatorDataTable(
            Session session,
            QueryExpression queryExpression) {

        super(session, queryExpression.sortAndSlice);

        table              = queryExpression.resultTable.duplicate();
        visibleColumnCount = table.getColumnCount();
        store = session.sessionData.getNewResultRowStore(table, true);
        table.store        = store;
        mainIndex          = queryExpression.mainIndex;
        fullIndex          = queryExpression.fullIndex;
    }

    public RowSetNavigatorDataTable(Session session, Table table) {

        super(session, SortAndSlice.noSort);

        this.table         = table;
        visibleColumnCount = table.getColumnCount();
        mainIndex          = table.getPrimaryIndex();
        fullIndex          = table.getFullIndex(session);
        store              = table.getRowStore(session);
        size               = (int) store.elementCount();

        reset();
    }

    public void sortFull() {

        if (reindexTable) {
            store.indexRows((Session) session);
        }

        mainIndex = fullIndex;

        reset();
    }

    public void sortOrder() {

        if (orderIndex != null) {
            if (reindexTable) {
                store.indexRows((Session) session);
            }

            mainIndex = orderIndex;

            reset();
        }
    }

    public void sortOrderUnion(SortAndSlice sortAndSlice) {

        if (sortAndSlice.index != null) {
            mainIndex = sortAndSlice.index;

            reset();
        }
    }

    public void add(Object[] data) {

        try {
            if (table.getDataColumnCount() > data.length) {
                Object[] d = table.getEmptyRowData();

                ArrayUtil.copyArray(data, d, data.length);

                data = d;
            }

            Row row = (Row) store.getNewCachedObject(
                (Session) session,
                data,
                false);

            store.indexRow((Session) session, row);

            size++;
        } catch (HsqlException e) {}
    }

    void addAdjusted(Object[] data, int[] columnMap) {

        try {
            if (columnMap == null) {
                data = (Object[]) ArrayUtil.resizeArrayIfDifferent(
                    data,
                    visibleColumnCount);
            } else {
                Object[] newData = new Object[visibleColumnCount];

                ArrayUtil.projectRow(data, columnMap, newData);

                data = newData;
            }

            add(data);
        } catch (HsqlException e) {}
    }

    /**
     * Used when updating results via JDBC ResultSet methods.
     * The instance iterator is reset as it may become invalid after a row is
     * removed.
     */
    public void updateData(long oldRowId, Object[] newData) {

        tempRowData[0] = oldRowId;

        RowIterator it = idIndex.findFirstRow(
            (Session) session,
            store,
            tempRowData,
            idIndex.getDefaultColumnMap());

        if (it.next()) {
            it.removeCurrent();
            it.release();

            size--;

            add(newData);
        }

        resetIterator();
    }

    /**
     * Used while building grouped results.
     */
    public void updateData(Object[] oldData, Object[] newData) {

        if (isSimpleAggregate) {
            return;
        }

        RowIterator it = groupIndex.findFirstRow(
            (Session) session,
            store,
            oldData);

        if (it.next()) {
            it.removeCurrent();
            it.release();

            size--;

            add(newData);
        }
    }

    public boolean absolute(int position) {

        if (position < 0) {
            position += size;
        }

        if (position < 0) {
            beforeFirst();

            return false;
        }

        if (position >= size) {
            afterLast();

            return false;
        }

        if (size == 0) {
            return false;
        }

        currentPos = position;

        return true;
    }

    private boolean toCurrentRow() {

        if (rowNumIndex == mainIndex) {
            tempRowData[0] = (long) currentPos;
            iterator = rowNumIndex.findFirstRow(
                (Session) session,
                store,
                tempRowData,
                rowNumIndex.getDefaultColumnMap());

            iterator.next();

            iteratorPos = currentPos;
        } else {
            if (iteratorPos > currentPos) {
                resetIterator();
            }

            while (iteratorPos < currentPos) {
                iterator.next();

                iteratorPos++;
            }
        }

        return true;
    }

    public Object[] getCurrent() {

        if (currentPos < 0 || currentPos >= size) {
            return null;
        }

        if (currentPos != iteratorPos) {
            toCurrentRow();
        }

        return iterator.getCurrent();
    }

    public Row getCurrentRow() {

        if (currentPos < 0 || currentPos >= size) {
            return null;
        }

        if (currentPos != iteratorPos) {
            toCurrentRow();
        }

        return iterator.getCurrentRow();
    }

    public boolean next() {
        return super.next();
    }

    public void removeCurrent() {

        Row currentRow = getCurrentRow();

        if (currentRow != null) {
            iterator.removeCurrent();
            iterator.next();

            currentPos--;
            size--;
        }
    }

    public void reset() {
        super.reset();
        resetIterator();
    }

    void resetIterator() {

        if (iterator != null) {
            iterator.release();
        }

        iterator = mainIndex.firstRow((Session) session, store, null, 0, null);
        iteratorPos = -1;
    }

    public void release() {

        if (isClosed) {
            return;
        }

        iterator.release();
        store.release();

        isClosed = true;
    }

    public void clear() {

        store.removeAll();

        size = 0;

        reset();
    }

    public boolean isMemory() {
        return store.isMemory();
    }

    public void read(RowInputInterface in, ResultMetaData meta) {}

    public void write(RowOutputInterface out, ResultMetaData meta) {

        reset();
        out.writeLong(id);
        out.writeInt(size);
        out.writeInt(0);    // offset
        out.writeInt(size);

        while (next()) {
            Object[] data = getCurrent();

            out.writeData(
                meta.getExtendedColumnCount(),
                meta.columnTypes,
                data,
                null,
                null);
        }

        reset();
    }

    public Object[] getData(long rowId) {

        tempRowData[0] = rowId;

        RowIterator it = idIndex.findFirstRow(
            (Session) session,
            store,
            tempRowData,
            idIndex.getDefaultColumnMap());

        it.next();

        return it.getCurrent();
    }

    public void copy(RowSetNavigatorData other, int[] rightColumnIndexes) {

        while (other.next()) {
            Object[] currentData = other.getCurrent();

            addAdjusted(currentData, rightColumnIndexes);
        }
    }

    public void union(RowSetNavigatorData other) {

        Object[] currentData;
        int      colCount = table.getColumnTypes().length;

        removeDuplicates();
        other.reset();

        while (other.next()) {
            currentData = other.getCurrent();

            RowIterator it = findFirstRow(currentData);

            if (!it.next()) {
                currentData = (Object[]) ArrayUtil.resizeArrayIfDifferent(
                    currentData,
                    colCount);

                add(currentData);
            }

            it.release();
        }

        reset();
    }

    public void intersect(RowSetNavigatorData other) {

        removeDuplicates();
        other.sortFull();

        while (next()) {
            Object[] currentData = getCurrent();
            boolean  hasRow      = other.containsRow(currentData);

            if (!hasRow) {
                removeCurrent();
            }
        }

        reset();
    }

    public void intersectAll(RowSetNavigatorData other) {

        Object[]    compareData = null;
        RowIterator it;
        Row         otherRow  = null;
        Object[]    otherData = null;

        sortFull();
        other.sortFull();

        it = RowIterator.emptyRowIterator;

        while (next()) {
            Object[] currentData = getCurrent();
            boolean newGroup = compareData == null
                               || fullIndex.compareRowNonUnique(
                                   (Session) session,
                                   currentData,
                                   compareData,
                                   fullIndex.getColumnCount()) != 0;

            if (newGroup) {
                compareData = currentData;
                it          = other.findFirstRow(currentData);
            }

            if (it.next()) {
                otherData = it.getCurrent();

                if (fullIndex.compareRowNonUnique((Session) session,
                                                  currentData,
                                                  otherData,
                                                  fullIndex.getColumnCount()) == 0) {
                    continue;
                }
            }

            removeCurrent();
        }

        reset();
    }

    public void except(RowSetNavigatorData other) {

        removeDuplicates();
        other.sortFull();

        while (next()) {
            Object[] currentData = getCurrent();
            boolean  hasRow      = other.containsRow(currentData);

            if (hasRow) {
                removeCurrent();
            }
        }

        reset();
    }

    public void exceptNoDedup(RowSetNavigatorData other) {

        other.sortFull();
        reset();

        while (next()) {
            Object[] currentData = getCurrent();
            boolean  hasRow      = other.containsRow(currentData);

            if (hasRow) {
                removeCurrent();
            }
        }

        reset();
    }

    public void exceptAll(RowSetNavigatorData other) {

        Object[]    compareData = null;
        RowIterator it;
        Object[]    otherData = null;

        sortFull();
        other.sortFull();

        it = RowIterator.emptyRowIterator;

        while (next()) {
            Object[] currentData = getCurrent();
            boolean newGroup = compareData == null
                               || fullIndex.compareRowNonUnique(
                                   (Session) session,
                                   currentData,
                                   compareData,
                                   fullIndex.getColumnCount()) != 0;

            if (newGroup) {
                compareData = currentData;
                it          = other.findFirstRow(currentData);
            }

            if (it.next()) {
                otherData = it.getCurrent();

                if (fullIndex.compareRowNonUnique((Session) session,
                                                  currentData,
                                                  otherData,
                                                  fullIndex.getColumnCount()) == 0) {
                    removeCurrent();
                }
            }
        }

        reset();
    }

    public boolean hasUniqueNotNullRows() {

        sortFull();

        Object[] lastRowData = null;

        while (next()) {
            Object[] currentData = getCurrent();

            if (hasNull(currentData)) {
                continue;
            }

            if (lastRowData != null
                    && fullIndex.compareRow((Session) session,
                                            lastRowData,
                                            currentData) == 0) {
                return false;
            } else {
                lastRowData = currentData;
            }
        }

        return true;
    }

    public void removeDuplicates() {

        sortFull();

        Object[] lastRowData = null;

        while (next()) {
            Object[] currentData = getCurrent();

            if (lastRowData != null
                    && fullIndex.compareRow((Session) session,
                                            lastRowData,
                                            currentData) == 0) {
                removeCurrent();
            } else {
                lastRowData = currentData;
            }
        }

        reset();
    }

    public void trim(int limitstart, int limitcount) {

        if (size == 0) {
            return;
        }

        if (limitstart >= size) {
            clear();

            return;
        }

        if (limitstart != 0) {
            reset();

            for (int i = 0; i < limitstart; i++) {
                next();
                removeCurrent();
            }
        }

        if (limitcount == 0 || limitcount >= size) {
            return;
        }

        reset();

        for (int i = 0; i < limitcount; i++) {
            next();
        }

        while (next()) {
            removeCurrent();
        }

        reset();
    }

    boolean hasNull(Object[] data) {

        for (int i = 0; i < visibleColumnCount; i++) {
            if (data[i] == null) {
                return true;
            }
        }

        return false;
    }

    /**
     * Special case for isSimpleAggregate cannot use index lookup.
     */
    public Object[] getGroupData(Object[] data) {

        if (isSimpleAggregate) {
            if (simpleAggregateData == null) {
                simpleAggregateData = data;

                return null;
            }

            return simpleAggregateData;
        }

        RowIterator it = groupIndex.findFirstRow(
            (Session) session,
            store,
            data);

        if (it.next()) {
            Row row = it.getCurrentRow();

            if (isAggregate) {
                row.setChanged(true);
            }

            return row.getData();
        }

        return null;
    }

    boolean containsRow(Object[] data) {

        RowIterator it = mainIndex.findFirstRow((Session) session, store, data);
        boolean     result = it.next();

        it.release();

        return result;
    }

    RowIterator findFirstRow(Object[] data) {
        return mainIndex.findFirstRow((Session) session, store, data);
    }
}
