/*
 * For work developed by the HSQL Development Group:
 *
 * Copyright (c) 2001-2010, 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,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 *
 * For work originally developed by the Hypersonic SQL Group:
 *
 * Copyright (c) 1995-2000, The Hypersonic SQL 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 Hypersonic SQL 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 THE HYPERSONIC SQL GROUP,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * on behalf of the Hypersonic SQL Group.
 */


package org.hsqldb.util;

import java.io.Serializable;
import java.sql.SQLException;
import java.util.Hashtable;

// fredt@users 20011220 - patch 481239 by xponsard@users - enhancements
// enhancements to support saving and loading of transfer settings,
// transfer of blobs, and catalog and schema names in source db
// changes by fredt to allow saving and loading of transfer settings
// fredt@users 20020215 - patch 516309 by Nicolas Bazin - enhancements
// sqlbob@users 20020325 - patch 1.7.0 - reengineering
// fredt@users 20040508 - patch 1.7.2 - bug fixes

/**
 * Transfers data from one database to another
 *
 * @author Thomas Mueller (Hypersonic SQL Group)
 * @version 1.7.2
 * @since Hypersonic SQL
 */
class TransferTable implements Serializable {

    Hashtable       hTypes;
    DataAccessPoint sourceDb;
    DataAccessPoint destDb;
    SQLStatements   Stmts = null;
    Traceable       tracer;

    TransferTable(DataAccessPoint src, String name, String schema,
                  String type, Traceable t) {

        Stmts         = new SQLStatements();
        sourceDb      = src;
        Stmts.sSchema = "";

        if (schema != null && schema.length() > 0) {
            Stmts.sSchema = schema;
        }

        Stmts.sType              = type;
        Stmts.sDatabaseToConvert = src.databaseToConvert;
        Stmts.sSourceTable       = Stmts.sDestTable = name;
        tracer                   = t;

        if (Stmts.sType.compareTo("TABLE") == 0) {
            Stmts.sSourceSelect = "SELECT * FROM "
                                  + src.helper.formatName(Stmts.sSourceTable);
        } else if (Stmts.sType.compareTo("VIEW") == 0) {
            Stmts.sSourceSelect = "";
        }
    }

    void setDest(String _Schema, DataAccessPoint dest) throws Exception {

        destDb = dest;

        dest.helper.setSchema(_Schema);
    }

    /**
     * extractTableStructure
     *
     * @param Source
     * @param Destination
     * @throws Exception
     */
    void extractTableStructure(DataAccessPoint Source,
                               DataAccessPoint Destination) throws Exception {
        initTypes();
        Source.getTableStructure(this, Destination);
    }

    /**
     * @throws SQLException
     */
    void transferStructure() throws Exception {

        String Statement = new String("");

        if (destDb.helper.needTransferTransaction()) {
            try {
                destDb.setAutoCommit(false);
            } catch (Exception e) {}
        }

        if (Stmts.bTransfer == false) {
            tracer.trace("Table " + Stmts.sSourceTable + " not transfered");

            return;
        }

        tracer.trace("Table " + Stmts.sSourceTable + ": start transfer");

        try {
            if (Stmts.bDropIndex) {
                if (Stmts.sDestDropIndex.charAt(Stmts.sDestDropIndex.length()
                                                - 1) != ';') {
                    Stmts.sDestDropIndex += ";";
                }

                int lastsemicolon = 0;
                int nextsemicolon = Stmts.sDestDropIndex.indexOf(';');

                while (nextsemicolon > lastsemicolon) {
                    Statement = Stmts.sDestDropIndex.substring(lastsemicolon,
                            nextsemicolon);

                    while (Statement.charAt(Statement.length() - 1) == ';') {
                        Statement = Statement.substring(0, Statement.length()
                                                        - 1);
                    }

                    try {
                        tracer.trace("Executing " + Statement);
                        destDb.execute(Statement);
                    } catch (Exception e) {
                        tracer.trace("Ignoring error " + e.getMessage());
                    }

                    lastsemicolon = nextsemicolon + 1;
                    nextsemicolon = lastsemicolon
                                    + Stmts.sDestDropIndex.substring(
                                        lastsemicolon).indexOf(';');
                }
            }

            if (Stmts.bDelete) {
                if (Stmts.sDestDelete.charAt(Stmts.sDestDelete.length() - 1)
                        != ';') {
                    Stmts.sDestDelete += ";";
                }

                int lastsemicolon = 0;
                int nextsemicolon = Stmts.sDestDelete.indexOf(';');

                while (nextsemicolon > lastsemicolon) {
                    Statement = Stmts.sDestDelete.substring(lastsemicolon,
                            nextsemicolon);

                    while (Statement.charAt(Statement.length() - 1) == ';') {
                        Statement = Statement.substring(0, Statement.length()
                                                        - 1);
                    }

                    try {
                        tracer.trace("Executing " + Statement);
                        destDb.execute(Statement);
                    } catch (Exception e) {
                        tracer.trace("Ignoring error " + e.getMessage());
                    }

                    lastsemicolon = nextsemicolon + 1;
                    nextsemicolon = lastsemicolon
                                    + Stmts.sDestDelete.substring(
                                        lastsemicolon).indexOf(';');
                }
            }

            if (Stmts.bDrop) {
                if (Stmts.sDestDrop.charAt(Stmts.sDestDrop.length() - 1)
                        != ';') {
                    Stmts.sDestDrop += ";";
                }

                int lastsemicolon = 0;
                int nextsemicolon = Stmts.sDestDrop.indexOf(';');

                while (nextsemicolon > lastsemicolon) {
                    Statement = Stmts.sDestDrop.substring(lastsemicolon,
                                                          nextsemicolon);

                    while (Statement.charAt(Statement.length() - 1) == ';') {
                        Statement = Statement.substring(0, Statement.length()
                                                        - 1);
                    }

                    try {
                        tracer.trace("Executing " + Statement);
                        destDb.execute(Statement);
                    } catch (Exception e) {
                        tracer.trace("Ignoring error " + e.getMessage());
                    }

                    lastsemicolon = nextsemicolon + 1;
                    nextsemicolon = lastsemicolon
                                    + Stmts.sDestDrop.substring(
                                        lastsemicolon).indexOf(';');
                }
            }

            if (Stmts.bCreate) {
                if (Stmts.sDestCreate.charAt(Stmts.sDestCreate.length() - 1)
                        != ';') {
                    Stmts.sDestCreate += ";";
                }

                int lastsemicolon = 0;
                int nextsemicolon = Stmts.sDestCreate.indexOf(';');

                while (nextsemicolon > lastsemicolon) {
                    Statement = Stmts.sDestCreate.substring(lastsemicolon,
                            nextsemicolon);

                    while (Statement.charAt(Statement.length() - 1) == ';') {
                        Statement = Statement.substring(0, Statement.length()
                                                        - 1);
                    }

                    tracer.trace("Executing " + Statement);
                    destDb.execute(Statement);

                    lastsemicolon = nextsemicolon + 1;
                    nextsemicolon = lastsemicolon
                                    + Stmts.sDestCreate.substring(
                                        lastsemicolon).indexOf(';');
                }
            }
        } catch (Exception e) {
            try {
                if (!destDb.getAutoCommit()) {
                    destDb.rollback();
                }
            } catch (Exception e1) {}

            throw (e);
        }

        if (!destDb.getAutoCommit()) {
            destDb.commit();

            try {
                destDb.setAutoCommit(true);
            } catch (Exception e) {}
        }
    }

    void transferData(int iMaxRows) throws Exception, SQLException {

        if (destDb.helper.needTransferTransaction()) {
            try {
                destDb.setAutoCommit(false);
            } catch (Exception e) {}
        }

        try {
            if (Stmts.bInsert) {
                if (destDb.helper.needTransferTransaction()) {
                    try {
                        destDb.setAutoCommit(false);
                    } catch (Exception e) {}
                }

                tracer.trace("Executing " + Stmts.sSourceSelect);

                TransferResultSet r = sourceDb.getData(Stmts.sSourceSelect);

                tracer.trace("Start transfering data...");
                destDb.beginDataTransfer();
                tracer.trace("Executing " + Stmts.sDestInsert);
                destDb.putData(Stmts.sDestInsert, r, iMaxRows);
                destDb.endDataTransfer();
                tracer.trace("Finished");

                if (!destDb.getAutoCommit()) {
                    destDb.commit();

                    try {
                        destDb.setAutoCommit(true);
                    } catch (Exception e) {}
                }
            }
        } catch (Exception e) {
            try {
                if (!destDb.getAutoCommit()) {
                    destDb.rollback();
                }
            } catch (Exception e1) {}

            throw (e);
        }

        if (!destDb.getAutoCommit()) {
            destDb.commit();

            try {
                destDb.setAutoCommit(true);
            } catch (Exception e) {}
        }
    }

    void transferAlter() throws Exception {

        String Statement = new String("");

        if (destDb.helper.needTransferTransaction()) {
            try {
                destDb.setAutoCommit(false);
            } catch (Exception e) {}
        }

        if (Stmts.bTransfer == false) {
            tracer.trace("Table " + Stmts.sSourceTable + " not transfered");

            return;
        }

        tracer.trace("Table " + Stmts.sSourceTable + ": start alter");

        try {
            if (Stmts.bCreateIndex) {
                if (Stmts.sDestCreateIndex.charAt(
                        Stmts.sDestCreateIndex.length() - 1) != ';') {
                    Stmts.sDestCreateIndex += ";";
                }

                int lastsemicolon = 0;
                int nextsemicolon = Stmts.sDestCreateIndex.indexOf(';');

                while (nextsemicolon > lastsemicolon) {
                    Statement = Stmts.sDestCreateIndex.substring(lastsemicolon,
                            nextsemicolon);

                    while (Statement.charAt(Statement.length() - 1) == ';') {
                        Statement = Statement.substring(0, Statement.length()
                                                        - 1);
                    }

                    try {
                        tracer.trace("Executing " + Stmts.sDestCreateIndex);
                        destDb.execute(Statement);
                    } catch (Exception e) {
                        tracer.trace("Ignoring error " + e.getMessage());
                    }

                    lastsemicolon = nextsemicolon + 1;
                    nextsemicolon = lastsemicolon
                                    + Stmts.sDestCreateIndex.substring(
                                        lastsemicolon).indexOf(';');
                }
            }

            if (Stmts.bAlter) {
                if (Stmts.sDestAlter.charAt(Stmts.sDestAlter.length() - 1)
                        != ';') {
                    Stmts.sDestAlter += ";";
                }

                int lastsemicolon = 0;
                int nextsemicolon = Stmts.sDestAlter.indexOf(';');

                while (nextsemicolon > lastsemicolon) {
                    Statement = Stmts.sDestAlter.substring(lastsemicolon,
                                                           nextsemicolon);

                    while (Statement.charAt(Statement.length() - 1) == ';') {
                        Statement = Statement.substring(0, Statement.length()
                                                        - 1);
                    }

                    try {
                        tracer.trace("Executing " + Statement);
                        destDb.execute(Statement);
                    } catch (Exception e) {
                        tracer.trace("Ignoring error " + e.getMessage());
                    }

                    lastsemicolon = nextsemicolon + 1;
                    nextsemicolon = lastsemicolon
                                    + Stmts.sDestAlter.substring(
                                        lastsemicolon).indexOf(';');
                }
            }
        } catch (Exception e) {
            try {
                if (!destDb.getAutoCommit()) {
                    destDb.rollback();
                }
            } catch (Exception e1) {}

            throw (e);
        }

        if (!destDb.getAutoCommit()) {
            destDb.commit();

            try {
                destDb.setAutoCommit(true);
            } catch (Exception e) {}
        }
    }

    private void initTypes() throws SQLException {

        if (hTypes != null) {
            return;
        }

        hTypes = destDb.helper.getSupportedTypes();
    }
}
