HSQLDB example source code file (ScriptReaderBinary.java)

This example HSQLDB source code file (ScriptReaderBinary.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

bufferedinputstream, datainputstream, hsqlexception, hsqlexception, integer, io, ioexception, ioexception, object, object, result, rowinputbinary, scriptreaderbinary, string, string

The HSQLDB ScriptReaderBinary.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.DataInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;

import org.hsqldb.Database;
import org.hsqldb.HsqlException;
import org.hsqldb.Result;
import org.hsqldb.ResultConstants;
import org.hsqldb.Session;
import org.hsqldb.Table;
import org.hsqldb.Trace;
import org.hsqldb.lib.Iterator;
import org.hsqldb.lib.ResourceStreamProvider;
import org.hsqldb.lib.SimpleLog;
import org.hsqldb.rowio.RowInputBase;
import org.hsqldb.rowio.RowInputBinary;

/**
 * Reader corresponding to BinaryDatabaseScritReader.
 *
 * @author fredt@users
 * @version 1.7.2
 * @since 1.7.2
 */
class ScriptReaderBinary extends ScriptReaderBase {

    private RowInputBinary    rowIn;
    protected DataInputStream dataStreamIn;

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

        super(db, file);

        rowIn = new RowInputBinary();
    }

    protected void openFile() throws IOException {

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

        dataStreamIn = new DataInputStream(new BufferedInputStream(d,
                1 << 13));
    }

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

        Result   r  = Result.read(rowIn, dataStreamIn);
        Iterator it = r.iterator();

        while (it.hasNext()) {
            Object[] data   = (Object[]) it.next();
            String   s      = (String) data[0];
            Result   result = session.sqlExecuteDirectNoPreChecks(s);

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

                /** @todo fredt - trap if unavaialble external functions are to be ignored */
                throw Trace.error(result);
            }
        }
    }

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

        for (;;) {
            String s = readTableInit();

            if (s == null) {
                break;
            }

            String schema = session.getSchemaName(currentSchema);
            Table  t      = db.schemaManager.getUserTable(session, s, schema);
            int    j      = 0;

            for (j = 0; ; j++) {
                if (readRow(t) == false) {
                    break;
                }
            }

            int checkCount = readTableTerm();

            if (j != checkCount) {
                throw Trace.error(Trace.ERROR_IN_SCRIPT_FILE,
                                  Trace.ERROR_IN_BINARY_SCRIPT_1,
                                  new Object[] {
                    s, new Integer(j), new Integer(checkCount)
                });
            }
        }
    }

    // int : row size (0 if no more rows) ,
    // BinaryServerRowInput : row (column values)
    protected boolean readRow(Table t) throws IOException, HsqlException {

        boolean more = readRow(rowIn, 0);

        if (!more) {
            return false;
        }

        Object[] data = rowIn.readData(t.getColumnTypes());

        t.insertFromScript(data);

        return true;
    }

    // int : rowcount
    protected int readTableTerm() throws IOException, HsqlException {
        return dataStreamIn.readInt();
    }

    // int : headersize (0 if no more tables), String : tablename, int : operation,
    // String : schemaname
    protected String readTableInit() throws IOException, HsqlException {

        boolean more = readRow(rowIn, 0);

        if (!more) {
            return null;
        }

        String s = rowIn.readString();

        // operation is always INSERT
        int checkOp = rowIn.readIntData();

        if (checkOp == ScriptWriterBase.INSERT_WITH_SCHEMA) {
            currentSchema = rowIn.readString();
        } else {
            currentSchema = null;
        }

        if (checkOp != ScriptWriterBase.INSERT
                && checkOp != ScriptWriterBase.INSERT_WITH_SCHEMA) {
            throw Trace.error(Trace.ERROR_IN_SCRIPT_FILE,
                              Trace.ERROR_IN_BINARY_SCRIPT_2);
        }

        return s;
    }

    boolean readRow(RowInputBase rowin, int pos) throws IOException {

        try {
            int length = dataStreamIn.readInt();
            int count  = 4;

            if (length == 0) {
                return false;
            }

            rowin.resetRow(pos, length);
            dataStreamIn.readFully(rowin.getBuffer(), count, length - count);

            return true;
        } catch (EOFException e) {
            return false;
        }
    }

    public boolean readLoggedStatement(Session session) throws IOException {
        return false;
    }

    public void close() {

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