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HSQLDB example source code file (RowInputBase.java)

This example HSQLDB source code file (RowInputBase.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

binary, date, hsqlexception, hsqlexception, integer, io, ioexception, ioexception, jdbc, long, math, no_pos, object, object, rowinputbase, rowinputbase, sql, string

The HSQLDB RowInputBase.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.rowio;

import java.io.IOException;
import java.math.BigDecimal;
import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;

import org.hsqldb.HsqlException;
import org.hsqldb.Trace;
import org.hsqldb.Types;
import org.hsqldb.lib.HsqlByteArrayInputStream;
import org.hsqldb.types.Binary;

/**
 * Base class for reading the data for a database row in different formats.
 * Defines the methods that are independent of storage format and declares
 * the format-dependent methods that subclasses should define.
 *
 * @author sqlbob@users (RMP)
 * @author fredt@users
 * @version 1.7.2
 * @since 1.7.0
 */
public abstract class RowInputBase extends HsqlByteArrayInputStream {

    static final int NO_POS = -1;

    // fredt - initialisation may be unnecessary as it's done in resetRow()
    protected int filePos = NO_POS;
    protected int size;

    public RowInputBase() {
        this(new byte[4]);
    }

    /**
     * Constructor takes a complete row
     */
    public RowInputBase(byte[] buf) {

        super(buf);

        size = buf.length;
    }

    public int getPos() {

        if (filePos == NO_POS) {

//                Trace.printSystemOut(Trace.DatabaseRowInput_getPos);
        }

        return (filePos);
    }

    public int getSize() {
        return size;
    }

// fredt@users - comment - methods used for node and type data
    public abstract int readIntData() throws IOException;

    public abstract long readLongData() throws IOException;

    public abstract int readType() throws IOException;

    public abstract String readString() throws IOException;

// fredt@users - comment - methods used for SQL types
    protected abstract boolean checkNull() throws IOException;

    protected abstract String readChar(int type)
    throws IOException, HsqlException;

    protected abstract Integer readSmallint()
    throws IOException, HsqlException;

    protected abstract Integer readInteger()
    throws IOException, HsqlException;

    protected abstract Long readBigint() throws IOException, HsqlException;

    protected abstract Double readReal(int type)
    throws IOException, HsqlException;

    protected abstract BigDecimal readDecimal()
    throws IOException, HsqlException;

    protected abstract Boolean readBit() throws IOException, HsqlException;

    protected abstract Time readTime() throws IOException, HsqlException;

    protected abstract Date readDate() throws IOException, HsqlException;

    protected abstract Timestamp readTimestamp()
    throws IOException, HsqlException;

    protected abstract Object readOther() throws IOException, HsqlException;

    protected abstract Binary readBinary(int type)
    throws IOException, HsqlException;

    /**
     *  reads row data from a stream using the JDBC types in colTypes
     *
     * @param  colTypes
     * @return
     * @throws  IOException
     * @throws  HsqlException
     */
    public Object[] readData(int[] colTypes)
    throws IOException, HsqlException {

        int      l    = colTypes.length;
        Object[] data = new Object[l];
        Object   o;
        int      type;

        for (int i = 0; i < l; i++) {
            if (checkNull()) {
                continue;
            }

            o    = null;
            type = colTypes[i];

            switch (type) {

                case Types.NULL :
                case Types.CHAR :
                case Types.VARCHAR :
                case Types.VARCHAR_IGNORECASE :
                case Types.LONGVARCHAR :
                    o = readChar(type);
                    break;

                case Types.TINYINT :
                case Types.SMALLINT :
                    o = readSmallint();
                    break;

                case Types.INTEGER :
                    o = readInteger();
                    break;

                case Types.BIGINT :
                    o = readBigint();
                    break;

                //fredt although REAL is now Double, it is read / written in
                //the old format for compatibility
                case Types.REAL :
                case Types.FLOAT :
                case Types.DOUBLE :
                    o = readReal(type);
                    break;

                case Types.NUMERIC :
                case Types.DECIMAL :
                    o = readDecimal();
                    break;

                case Types.DATE :
                    o = readDate();
                    break;

                case Types.TIME :
                    o = readTime();
                    break;

                case Types.TIMESTAMP :
                    o = readTimestamp();
                    break;

                case Types.BOOLEAN :
                    o = readBit();
                    break;

                case Types.OTHER :
                    o = readOther();
                    break;

                case Types.BINARY :
                case Types.VARBINARY :
                case Types.LONGVARBINARY :
                    o = readBinary(type);
                    break;

                default :
                    throw Trace.runtimeError(
                        Trace.UNSUPPORTED_INTERNAL_OPERATION,
                        "RowInputBase " + Types.getTypeString(type));
            }

            data[i] = o;
        }

        return data;
    }

    /**
     *  Used to reset the row, ready for a new row to be written into the
     *  byte[] buffer by an external routine.
     *
     */
    public void resetRow(int filepos, int rowsize) throws IOException {

        mark = 0;

        reset();

        if (buffer.length < rowsize) {
            buffer = new byte[rowsize];
        }

        this.filePos = filepos;
        size    = count = rowsize;
        pos     = 4;
        buffer[0]  = (byte) ((rowsize >>> 24) & 0xFF);
        buffer[1]  = (byte) ((rowsize >>> 16) & 0xFF);
        buffer[2]  = (byte) ((rowsize >>> 8) & 0xFF);
        buffer[3]  = (byte) ((rowsize >>> 0) & 0xFF);
    }

    public byte[] getBuffer() {
        return buffer;
    }

    public int skipBytes(int n) throws IOException {
        throw Trace.runtimeError(Trace.UNSUPPORTED_INTERNAL_OPERATION,
                                 "RowInputBase");
    }

    public String readLine() throws IOException {
        throw Trace.runtimeError(Trace.UNSUPPORTED_INTERNAL_OPERATION,
                                 "RowInputBase");
    }
}

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