HSQLDB example source code file (ScriptReaderText.java)

This example HSQLDB source code file (ScriptReaderText.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - HSQLDB tags/keywords

bufferedreader, exception, hsqlexception, hsqlexception, insert_statement, insert_statement, io, ioexception, ioexception, object, rowinputtextlog, schema_statement, scriptreadertext, string, string

The HSQLDB ScriptReaderText.java source code

/* Copyright (c) 2001-2008, 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.
 */


package org.hsqldb.scriptio;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.hsqldb.Database;
import org.hsqldb.HsqlException;
import org.hsqldb.Result;
import org.hsqldb.Session;
import org.hsqldb.Trace;
import org.hsqldb.lib.SimpleLog;
import org.hsqldb.lib.ResourceStreamProvider;
import org.hsqldb.lib.StringConverter;
import org.hsqldb.rowio.RowInputTextLog;

/**
 * Handles operations involving reading back a script or log file written
 * out by ScriptWriterText. This implementation
 * corresponds to ScriptWriterText.
 *
 *  @author fredt@users
 *  @version 1.8.0
 *  @since 1.7.2
 */
public class ScriptReaderText extends ScriptReaderBase {

    // this is used only to enable reading one logged line at a time
    BufferedReader  dataStreamIn;
    RowInputTextLog rowIn;
    boolean         isInsert;

    ScriptReaderText(Database db,
                     String file) throws HsqlException, IOException {

        super(db, file);

        rowIn = new RowInputTextLog();
    }

    protected void openFile() throws IOException {

        InputStream d = db.isFilesInJar()
                        ? ResourceStreamProvider.getResourceAsStream(fileName)
                        : db.getFileAccess().openInputStreamElement(fileName);

        dataStreamIn = new BufferedReader(
            new InputStreamReader(new BufferedInputStream(d)));
    }

    protected void readDDL(Session session) throws IOException, HsqlException {

        for (; readLoggedStatement(session); ) {
            if (rowIn.getStatementType() == INSERT_STATEMENT) {
                isInsert = true;

                break;
            }

            Result result = session.sqlExecuteDirectNoPreChecks(statement);

            if (result != null && result.isError()) {
                db.logger.appLog.logContext(SimpleLog.LOG_ERROR,
                                            result.getMainString());

                HsqlException error =
                    Trace.error(Trace.ERROR_IN_SCRIPT_FILE,
                                Trace.DatabaseScriptReader_readDDL,
                                new Object[] {
                    new Integer(lineCount), result.getMainString()
                });

                /** @todo fredt - if unavaialble external functions are to be ignored */
                throw error;
            }
        }
    }

    protected void readExistingData(Session session)
    throws IOException, HsqlException {

        try {
            String tablename = null;

            // fredt - needed for forward referencing FK constraints
            db.setReferentialIntegrity(false);

            for (; isInsert || readLoggedStatement(session);
                    isInsert = false) {
                if (statementType == SCHEMA_STATEMENT) {
                    session.setSchema(currentSchema);

                    continue;
                } else if (statementType == INSERT_STATEMENT) {
                    if (!rowIn.getTableName().equals(tablename)) {
                        tablename = rowIn.getTableName();

                        String schema = session.getSchemaName(currentSchema);

                        currentTable = db.schemaManager.getUserTable(session,
                                tablename, schema);
                    }

                    currentTable.insertFromScript(rowData);
                }
            }

            db.setReferentialIntegrity(true);
        } catch (Exception e) {
            db.logger.appLog.logContext(e, null);

            throw Trace.error(Trace.ERROR_IN_SCRIPT_FILE,
                              Trace.DatabaseScriptReader_readExistingData,
                              new Object[] {
                new Integer(lineCount), e.toString()
            });
        }
    }

    public boolean readLoggedStatement(Session session) throws IOException {

        //fredt temporary solution - should read bytes directly from buffer
        String s = dataStreamIn.readLine();

        lineCount++;

//        System.out.println(lineCount);
        statement = StringConverter.asciiToUnicode(s);

        if (statement == null) {
            return false;
        }

        processStatement(session);

        return true;
    }

    private void processStatement(Session session) throws IOException {

        try {
            if (statement.startsWith("/*C")) {
                int endid = statement.indexOf('*', 4);

                sessionNumber = Integer.parseInt(statement.substring(3,
                        endid));
                statement = statement.substring(endid + 2);
            }

            rowIn.setSource(statement);

            statementType = rowIn.getStatementType();

            if (statementType == ANY_STATEMENT) {
                rowData      = null;
                currentTable = null;

                return;
            } else if (statementType == COMMIT_STATEMENT) {
                rowData      = null;
                currentTable = null;

                return;
            } else if (statementType == SCHEMA_STATEMENT) {
                rowData       = null;
                currentTable  = null;
                currentSchema = rowIn.getSchemaName();

                return;
            }

            String name   = rowIn.getTableName();
            String schema = session.getSchemaName(null);

            currentTable = db.schemaManager.getUserTable(session, name,
                    schema);

            int[] colTypes;

            if (statementType == INSERT_STATEMENT) {
                colTypes = currentTable.getColumnTypes();
            } else if (currentTable.hasPrimaryKey()) {
                colTypes = currentTable.getPrimaryKeyTypes();
            } else {
                colTypes = currentTable.getColumnTypes();
            }

            rowData = rowIn.readData(colTypes);
        } catch (Exception e) {
            throw new IOException(e.toString());
        }
    }

    public void close() {

        try {
            dataStreamIn.close();
        } catch (Exception e) {}
    }
}