HSQLDB example source code file (RowInputTextLog.java)

This example HSQLDB source code file (RowInputTextLog.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

bigdecimal, bigdecimal, date, hsqlexception, hsqlexception, integer, io, ioexception, ioexception, jdbc, math, rowinputbase, rowinputtextlog, sql, string, string, tokenizer, true

The HSQLDB RowInputTextLog.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.Column;
import org.hsqldb.HsqlDateTime;
import org.hsqldb.HsqlException;
import org.hsqldb.Token;
import org.hsqldb.Tokenizer;
import org.hsqldb.Types;
import org.hsqldb.scriptio.ScriptReaderBase;
import org.hsqldb.store.ValuePool;
import org.hsqldb.types.Binary;
import org.hsqldb.types.JavaObject;
import org.hsqldb.lib.java.JavaSystem;

/**
 *  Class for reading the data for a database row from the script file.
 *
 * @author fredt@users
 * @version 1.8.0
 * @since 1.7.3
 */
public class RowInputTextLog extends RowInputBase
implements RowInputInterface {

    Tokenizer tokenizer;
    String    tableName  = null;
    String    schemaName = null;
    int       statementType;

    public RowInputTextLog() {

        super(new byte[0]);

        tokenizer = new Tokenizer();
    }

    public void setSource(String text) throws HsqlException {

        tokenizer.reset(text);

        statementType = ScriptReaderBase.ANY_STATEMENT;

        String s = tokenizer.getString();

        if (s.equals(Token.T_INSERT)) {
            statementType = ScriptReaderBase.INSERT_STATEMENT;

            tokenizer.getString();

            tableName = tokenizer.getString();

            tokenizer.getString();
        } else if (s.equals(Token.T_DELETE)) {
            statementType = ScriptReaderBase.DELETE_STATEMENT;

            tokenizer.getString();

            tableName = tokenizer.getString();
        } else if (s.equals(Token.T_COMMIT)) {
            statementType = ScriptReaderBase.COMMIT_STATEMENT;
        } else if (s.equals(Token.T_SET)) {
            if (tokenizer.isGetThis(Token.T_SCHEMA)) {
                schemaName    = tokenizer.getSimpleName();
                statementType = ScriptReaderBase.SCHEMA_STATEMENT;
            }
        }
    }

    public int getStatementType() {
        return statementType;
    }

    public String getTableName() {
        return tableName;
    }

    public String getSchemaName() {
        return schemaName;
    }

    protected String readField() throws IOException {

        try {
            tokenizer.getString();

            if (statementType == ScriptReaderBase.DELETE_STATEMENT) {
                tokenizer.getString();
                tokenizer.getString();
            }

            String s = tokenizer.getString();

            if (tokenizer.getType() == Types.NULL) {
                s = null;
            }

            return s;
        } catch (HsqlException e) {
            throw new IOException(e.getMessage());
        }
    }

    protected String readNumberField() throws IOException {

        try {
            tokenizer.getString();

            if (statementType == ScriptReaderBase.DELETE_STATEMENT) {
                tokenizer.getString();
                tokenizer.getString();
            }

            String s = tokenizer.getString();

            if ("-".equals(s)) {
                s = s + tokenizer.getString();
            } else if (tokenizer.getType() == Types.NULL) {
                s = null;
            }

            return s;
        } catch (HsqlException e) {
            throw new IOException(e.getMessage());
        }
    }

    public String readString() throws IOException {

        String s = readField();

        return ValuePool.getString(s);
    }

    public short readShortData() throws IOException {

        String s = readNumberField();

        if (s == null) {
            return 0;
        }

        return Short.parseShort(s);
    }

    public int readIntData() throws IOException {

        String s = readNumberField();

        if (s == null) {
            return 0;
        }

        return Integer.parseInt(s);
    }

    public long readLongData() throws IOException {

        String s = readNumberField();

        if (s == null) {
            return 0;
        }

        return Long.parseLong(s);
    }

    public int readType() throws IOException {
        return 0;
    }

    protected boolean checkNull() {

        // Return null on each column read instead.
        return false;
    }

    protected String readChar(int type) throws IOException {
        return readString();
    }

    protected Integer readSmallint() throws IOException, HsqlException {

        String s = readNumberField();

        if (s == null) {
            return null;
        }

        int i = Integer.parseInt(s);

        return ValuePool.getInt(i);
    }

    protected Integer readInteger() throws IOException, HsqlException {

        String s = readNumberField();

        if (s == null) {
            return null;
        }

        int i = Integer.parseInt(s);

        return ValuePool.getInt(i);
    }

    protected Long readBigint() throws IOException, HsqlException {

        String s = readNumberField();

        if (s == null) {
            return null;
        }

        long i = Long.parseLong(s);

        return ValuePool.getLong(i);
    }

    protected Double readReal(int type) throws IOException, HsqlException {

        String s = readNumberField();

        if (s == null) {
            return null;
        }

        double i = JavaSystem.parseDouble(s);

        if (tokenizer.isGetThis(Token.T_DIVIDE)) {
            s = tokenizer.getString();

            // parse simply to ensure it's a number
            double ii = JavaSystem.parseDouble(s);

            if (i == 0E0) {
                i = Double.NaN;
            } else if (i == -1E0) {
                i = Double.NEGATIVE_INFINITY;
            } else if (i == 1E0) {
                i = Double.POSITIVE_INFINITY;
            }
        }

        return ValuePool.getDouble(Double.doubleToLongBits(i));
    }

    protected BigDecimal readDecimal() throws IOException, HsqlException {

        String s = readNumberField();

        if (s == null) {
            return null;
        }

        BigDecimal i = new BigDecimal(s);

        return ValuePool.getBigDecimal(i);
    }

    protected Time readTime() throws IOException, HsqlException {

        String s = readField();

        if (s == null) {
            return null;
        }

        return HsqlDateTime.timeValue(s);
    }

    protected Date readDate() throws IOException, HsqlException {

        String s = readField();

        if (s == null) {
            return null;
        }

        return HsqlDateTime.dateValue(s);
    }

    protected Timestamp readTimestamp() throws IOException, HsqlException {

        String s = readField();

        if (s == null) {
            return null;
        }

        return HsqlDateTime.timestampValue(s);
    }

    protected Boolean readBit() throws IOException, HsqlException {

        String s = readField();

        if (s == null) {
            return null;
        }

        return s.equalsIgnoreCase("TRUE") ? Boolean.TRUE
                                          : Boolean.FALSE;
    }

    protected Object readOther() throws IOException, HsqlException {

        byte[] data;
        String s = readField();

        if (s == null) {
            return null;
        }

        data = Column.hexToByteArray(s);

        return new JavaObject(data);
    }

    protected Binary readBinary(int type) throws IOException, HsqlException {

        String s = readField();

        if (s == null) {
            return null;
        }

        return new Binary(Column.hexToByteArray(s), false);
    }
}