Package org.hsqldb.persist

Source Code of org.hsqldb.persist.RowStoreAVL

/* Copyright (c) 2001-2010, The HSQL Development Group
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* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
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* list of conditions and the following disclaimer.
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* 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.
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* contributors may be used to endorse or promote products derived from this
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package org.hsqldb.persist;

import org.hsqldb.ColumnSchema;
import org.hsqldb.HsqlException;
import org.hsqldb.Row;
import org.hsqldb.RowAVL;
import org.hsqldb.Session;
import org.hsqldb.Table;
import org.hsqldb.TableBase;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.index.Index;
import org.hsqldb.index.IndexAVL;
import org.hsqldb.index.NodeAVL;
import org.hsqldb.lib.ArrayUtil;
import org.hsqldb.navigator.RowIterator;
import org.hsqldb.rowio.RowInputInterface;
import org.hsqldb.types.Type;

public abstract class RowStoreAVL implements PersistentStore {

    PersistentStoreCollection manager;
    Index[]                   indexList    = Index.emptyArray;
    CachedObject[]            accessorList = CachedObject.emptyArray;
    TableBase                 table;
    int                       elementCount;

    // for result tables
    // for INFORMATION SCHEMA tables
    long timestamp;

    public TableBase getTable() {
        return table;
    }

    public long getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(long timestamp) {
        this.timestamp = timestamp;
    }

    public boolean isMemory() {
        return false;
    }

    public abstract int getAccessCount();

    public abstract void set(CachedObject object);

    public abstract CachedObject get(int key, boolean keep);

    public abstract CachedObject get(CachedObject object, boolean keep);

    public abstract int getStorageSize(int key);

    public abstract void add(CachedObject object);

    public abstract CachedObject get(RowInputInterface in);

    public abstract CachedObject getNewInstance(int size);

    public abstract CachedObject getNewCachedObject(Session session,
            Object object);

    public abstract void removePersistence(int i);

    public abstract void removeAll();

    public abstract void remove(int i);

    public abstract void release(int i);

    public abstract void commitPersistence(CachedObject object);

    public abstract DataFileCache getCache();

    public abstract void setCache(DataFileCache cache);

    public abstract void release();

    public PersistentStore getAccessorStore(Index index) {
        return null;
    }

    public CachedObject getAccessor(Index key) {

        int position = key.getPosition();

        if (position >= accessorList.length) {
            throw Error.runtimeError(ErrorCode.U_S0500, "RowStoreAVL");
        }

        return accessorList[position];
    }

    /**
     * Basic delete with no logging or referential checks.
     */
    public void delete(Session session, Row row) {

        row = (Row) get(row, false);

        for (int i = indexList.length - 1; i >= 0; i--) {
            indexList[i].delete(session, this, row);
        }

        row.delete(this);
    }

    public void indexRow(Session session, Row row) {

        int i = 0;

        try {
            for (; i < indexList.length; i++) {
                indexList[i].insert(session, this, row);
            }
        } catch (HsqlException e) {

            // unique index violation - rollback insert
            for (--i; i >= 0; i--) {
                indexList[i].delete(session, this, row);
            }

            remove(row.getPos());

            throw e;
        }
    }

    //
    public final void indexRows() {

        RowIterator it = rowIterator();

        for (int i = 1; i < indexList.length; i++) {
            setAccessor(indexList[i], null);
        }

        while (it.hasNext()) {
            Row row = it.getNextRow();

            ((RowAVL) row).clearNonPrimaryNodes();

            for (int i = 1; i < indexList.length; i++) {
                indexList[i].insert(null, this, row);
            }
        }
    }

    public final RowIterator rowIterator() {

        if (indexList.length == 0 || indexList[0] == null) {
            throw Error.runtimeError(ErrorCode.U_S0500, "RowStoreAVL");
        }

        return indexList[0].firstRow(this);
    }

    public abstract void setAccessor(Index key, CachedObject accessor);

    public abstract void setAccessor(Index key, int accessor);

    public void resetAccessorKeys(Index[] keys) {

        if (indexList.length == 0 || indexList[0] == null
                || accessorList[0] == null) {
            indexList    = keys;
            accessorList = new CachedObject[indexList.length];

            return;
        }

        CachedObject[] oldAccessors = accessorList;
        Index[]        oldIndexList = indexList;
        int            limit        = indexList.length;
        int            diff         = 1;
        int            position     = 0;

        if (keys.length < indexList.length) {
            diff  = -1;
            limit = keys.length;
        }

        for (; position < limit; position++) {
            if (indexList[position] != keys[position]) {
                break;
            }
        }

        accessorList = (CachedObject[]) ArrayUtil.toAdjustedArray(accessorList,
                null, position, diff);
        indexList = keys;

        try {
            if (diff > 0) {
                insertIndexNodes(indexList[0], indexList[position]);
            } else {
                dropIndexFromRows(indexList[0], oldIndexList[position]);
            }
        } catch (HsqlException e) {
            accessorList = oldAccessors;
            indexList    = oldIndexList;

            throw e;
        }
    }

    public int elementCount(Session session) {

        if (elementCount < 0) {
            Index index = this.indexList[0];

            if (index == null) {
                elementCount = 0;
            } else {
                elementCount = ((IndexAVL) index).getNodeCount(session, this);
            }
        }

        return elementCount;
    }

    public int elementCountUnique(Index index) {
        return 0;
    }

    public void setElementCount(Index key, int size, int uniqueSize) {
        elementCount = size;
    }

    public void updateElementCount(Index key, int size, int uniqueSize) {

        if (key.getPosition() == 0 && elementCount > -1) {
            elementCount += size;
        }
    }

    /**
     * Moves the data from an old store to new after changes to table
     * The colindex argument is the index of the column that was
     * added or removed. The adjust argument is {-1 | 0 | +1}
     */
    public final void moveData(Session session, PersistentStore other,
                               int colindex, int adjust) {

        Type   oldtype  = null;
        Type   newtype  = null;
        Object colvalue = null;

        if (adjust >= 0 && colindex != -1) {
            ColumnSchema column = ((Table) table).getColumn(colindex);

            colvalue = column.getDefaultValue(session);
            newtype  = ((Table) table).getColumnTypes()[colindex];
        }

        if (adjust <= 0 && colindex != -1) {
            oldtype = ((Table) other.getTable()).getColumnTypes()[colindex];
        }

        RowIterator it    = other.rowIterator();
        Table       table = (Table) this.table;

        try {
            while (it.hasNext()) {
                Row      row      = it.getNextRow();
                Object[] olddata  = row.getData();
                Object[] data     = table.getEmptyRowData();
                Object   oldvalue = null;

                if (adjust == 0 && colindex != -1) {
                    oldvalue = olddata[colindex];
                    colvalue = newtype.convertToType(session, oldvalue,
                                                     oldtype);
                }

                if (colvalue != null && newtype.isLobType()) {
                    session.sessionData.adjustLobUsageCount(colvalue, +1);
                }

                if (oldvalue != null && oldtype != null
                        && oldtype.isLobType()) {
                    session.sessionData.adjustLobUsageCount(oldvalue, -1);
                }

                ArrayUtil.copyAdjustArray(olddata, data, colvalue, colindex,
                                          adjust);
                table.systemSetIdentityColumn(session, data);
                table.enforceTypeLimits(session, data);
                table.enforceRowConstraints(session, data);

                // get object without RowAction
                Row newrow = (Row) getNewCachedObject(null, data);

                indexRow(null, newrow);
            }
        } catch (java.lang.OutOfMemoryError e) {
            throw Error.error(ErrorCode.OUT_OF_MEMORY);
        }
    }

    public void lock() {}

    public void unlock() {}

    void dropIndexFromRows(Index primaryIndex, Index oldIndex) {

        RowIterator it       = primaryIndex.firstRow(this);
        int         position = oldIndex.getPosition() - 1;

        while (it.hasNext()) {
            Row     row      = it.getNextRow();
            int     i        = position - 1;
            NodeAVL backnode = ((RowAVL) row).getNode(0);

            while (i-- > 0) {
                backnode = backnode.nNext;
            }

            backnode.nNext = backnode.nNext.nNext;
        }
    }

    boolean insertIndexNodes(Index primaryIndex, Index newIndex) {

        int           position = newIndex.getPosition();
        RowIterator   it       = primaryIndex.firstRow(this);
        int           rowCount = 0;
        HsqlException error    = null;

        try {
            while (it.hasNext()) {
                Row row = it.getNextRow();

                ((RowAVL) row).insertNode(position);

                // count before inserting
                rowCount++;

                newIndex.insert(null, this, row);
            }

            return true;
        } catch (java.lang.OutOfMemoryError e) {
            error = Error.error(ErrorCode.OUT_OF_MEMORY);
        } catch (HsqlException e) {
            error = e;
        }

        // backtrack on error
        // rowCount rows have been modified
        it = primaryIndex.firstRow(this);

        for (int i = 0; i < rowCount; i++) {
            Row     row      = it.getNextRow();
            NodeAVL backnode = ((RowAVL) row).getNode(0);
            int     j        = position;

            while (--j > 0) {
                backnode = backnode.nNext;
            }

            backnode.nNext = backnode.nNext.nNext;
        }

        throw error;
    }

    /**
     * for result tables
     */
    void reindex(Session session, Index index) {

        setAccessor(index, null);

        RowIterator it = table.rowIterator(this);

        while (it.hasNext()) {
            Row row = it.getNextRow();

            // may need to clear the node before insert
            index.insert(session, this, row);
        }
    }
}
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