Package org.hsqldb_voltpatches

Source Code of org.hsqldb_voltpatches.SessionContext

/* Copyright (c) 2001-2009, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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package org.hsqldb_voltpatches;

import org.hsqldb_voltpatches.lib.ArrayUtil;
import org.hsqldb_voltpatches.lib.HashMappedList;
import org.hsqldb_voltpatches.lib.HashSet;
import org.hsqldb_voltpatches.lib.HsqlArrayList;
import org.hsqldb_voltpatches.lib.LongDeque;
import org.hsqldb_voltpatches.navigator.RangeIterator;
import org.hsqldb_voltpatches.store.ValuePool;

/*
* Session execution context and temporary data structures
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 1.9.0
* @since 1.9.0
*/
public class SessionContext {

    Session session;

    //
    HashMappedList  sessionVariables;
    RangeVariable[] sessionVariablesRange;

    //
    private HsqlArrayList stack;
    public Object[]       routineArguments = ValuePool.emptyObjectArray;
    public Object[]       routineVariables = ValuePool.emptyObjectArray;
    Object[]              dynamicArguments = ValuePool.emptyObjectArray;
    public int            depth;

    //
    HashMappedList savepoints;
    LongDeque      savepointTimestamps;

    // range variable data
    RangeIterator[] rangeIterators;

    /**
     * Reusable set of all FK constraints that have so far been enforced while
     * a cascading insert or delete is in progress. This is emptied and passed
     * with the first call to checkCascadeDelete or checkCascadeUpdate. During
     * recursion, if an FK constraint is encountered and is already present
     * in the set, the recursion stops.
     */
    HashSet constraintPath;

    /**
     * Current list of all cascading updates on all table. This is emptied once
     * a cascading operation is over.
     */
    HashMappedList tableUpdateList;

    //
    StatementResultUpdate rowUpdateStatement = new StatementResultUpdate();

    /**
     * Creates a new instance of CompiledStatementExecutor.
     *
     * @param session the context in which to perform the execution
     */
    SessionContext(Session session) {

        this.session             = session;
        rangeIterators           = new RangeIterator[4];
        savepoints               = new HashMappedList(4);
        savepointTimestamps      = new LongDeque();
        sessionVariables         = new HashMappedList();
        sessionVariablesRange    = new RangeVariable[1];
        sessionVariablesRange[0] = new RangeVariable(sessionVariables, true);
    }

    public void push() {

        if (stack == null) {
            stack = new HsqlArrayList(true);
        }

        stack.add(dynamicArguments);
        stack.add(routineArguments);
        stack.add(routineVariables);
        stack.add(rangeIterators);
        stack.add(savepoints);
        stack.add(savepointTimestamps);

        rangeIterators      = new RangeIterator[4];
        savepoints          = new HashMappedList(4);
        savepointTimestamps = new LongDeque();

        String name =
            HsqlNameManager.getAutoSavepointNameString(session.actionTimestamp,
                depth);

        session.savepoint(name);

        depth++;
    }

    public void pop() {

        savepointTimestamps = (LongDeque) stack.remove(stack.size() - 1);
        savepoints          = (HashMappedList) stack.remove(stack.size() - 1);
        rangeIterators      = (RangeIterator[]) stack.remove(stack.size() - 1);
        routineVariables    = (Object[]) stack.remove(stack.size() - 1);
        routineArguments    = (Object[]) stack.remove(stack.size() - 1);
        dynamicArguments    = (Object[]) stack.remove(stack.size() - 1);

        depth--;
    }

    public void pushDynamicArguments(Object[] args) {

        if (stack == null) {
            stack = new HsqlArrayList(true);
        }

        stack.add(dynamicArguments);

        dynamicArguments = args;
    }

    public void popDynamicArguments() {
        dynamicArguments = (Object[]) stack.remove(stack.size() - 1);
    }

    void clearStructures(StatementDMQL cs) {

        if (cs.type == StatementTypes.UPDATE_WHERE
                || cs.type == StatementTypes.DELETE_WHERE
                || cs.type == StatementTypes.MERGE) {
            if (constraintPath != null) {
                constraintPath.clear();
            }

            if (tableUpdateList != null) {
                for (int i = 0; i < tableUpdateList.size(); i++) {
                    HashMappedList updateList =
                        (HashMappedList) tableUpdateList.get(i);

                    updateList.clear();
                }
            }
        }

        if (cs.type == StatementTypes.INSERT) {

            //
        }

        int count = cs.rangeIteratorCount;

        if (count > rangeIterators.length) {
            count = rangeIterators.length;
        }

        for (int i = 0; i < count; i++) {
            if (rangeIterators[i] != null) {
                rangeIterators[i].reset();
                rangeIterators[i] = null;
            }
        }
    }

    public RangeIterator getCheckIterator() {
        return rangeIterators[1];
    }

    public void setCheckIterator(RangeIterator iterator) {
        rangeIterators[iterator.getRangePosition()] = iterator;
    }

    public void setRangeIterator(RangeIterator iterator) {

        int position = iterator.getRangePosition();

        if (position >= rangeIterators.length) {
            rangeIterators =
                (RangeIterator[]) ArrayUtil.resizeArray(rangeIterators,
                    position + 1);
        }

        rangeIterators[iterator.getRangePosition()] = iterator;
    }

    /**
     * For cascade operations
     */
    public HashMappedList getTableUpdateList() {

        if (tableUpdateList == null) {
            tableUpdateList = new HashMappedList();
        }

        return tableUpdateList;
    }

    /**
     * For cascade operations
     */
    public HashSet getConstraintPath() {

        if (constraintPath == null) {
            constraintPath = new HashSet();
        }

        return constraintPath;
    }

    public void addSessionVariable(ColumnSchema variable) {

        int index = sessionVariables.size();

        sessionVariables.add(variable.getName().name, variable);

        Object[] vars = new Object[sessionVariables.size()];

        ArrayUtil.copyArray(routineVariables, vars, routineVariables.length);

        routineVariables        = vars;
        routineVariables[index] = variable.getDefaultValue(session);
    }
}
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