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package org.hsqldb;

import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.navigator.RowIterator;
import org.hsqldb.types.DateTimeType;
import org.hsqldb.types.TimestampData;

The methods in this class perform alterations to the structure of an
existing table which may result in a new Table object.
Author:
Fred Toussi (fredt@users dot sourceforge.net)
Version:
2.5.0
Since:
2.5.0/**
 * The methods in this class perform alterations to the structure of an
 * existing table which may result in a new Table object.
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.5.0
 * @since 2.5.0
 */
class TablePeriodWorks {

    private Table    table;
    private Session  session;

    public TablePeriodWorks(Session session, Table table) {

        this.table    = table;
        this.session  = session;
    }

    void addSystemPeriod(PeriodDefinition period) {

        if (table.systemPeriod != null) {
            throw Error.error(ErrorCode.X_42517);
        }

        TableWorks tw = new TableWorks(session, table);

        tw.addSystemPeriod(period);
    }

    void addApplicationPeriod(PeriodDefinition period) {
        throw Error.error(ErrorCode.X_0A501);
    }

    void addSystemVersioning() {

        if (table.isSystemVersioned) {
            throw Error.error(ErrorCode.X_42518);
        }

        if (table.systemPeriod == null) {
            throw Error.error(ErrorCode.X_42518);
        }

        table.isSystemVersioned = true;
    }

    void dropSystemPeriod(boolean cascade) {

        if (table.isSystemVersioned) {
            throw Error.error(ErrorCode.X_42518);
        }

        if (table.systemPeriod == null) {
            throw Error.error(ErrorCode.X_42517);
        }

        TableWorks tw = new TableWorks(session, table);

        tw.dropSystemPeriod(cascade);
    }

    void dropApplicationPeriod(boolean cascade) {
        throw Error.error(ErrorCode.X_0A501);
    }

    void dropSystemVersioning(boolean cascade) {

        if (!table.isSystemVersioned()) {
            throw Error.error(ErrorCode.X_42518);
        }

        TableWorks tw = new TableWorks(session, table);

        tw.dropSystemVersioning(cascade);

        long timestampLimit = DateTimeType.epochLimitTimestamp.getSeconds();

        removeOldRows(timestampLimit);

        table.isSystemVersioned = false;
    }

    long removeOldRows(long timestampLimit) {

        int         colIndex = table.systemPeriodEndColumn;
        long        count    = 0;
        RowIterator it       = table.rowIterator(session);

        while (it.next()) {
            TimestampData value = (TimestampData) it.getField(colIndex);

            if (value.getSeconds() < timestampLimit) {
                it.removeCurrent();
            }
        }

        return count;
    }
}