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HSQLDB example source code file (JavaSystem.java)

This example HSQLDB source code file (JavaSystem.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

biginteger, biginteger, compareingnorecase, exception, io, ioexception, ioexception, javasystem, jdbc, math, outputstream, printwriter, printwriter, sql, string, string, text, util

The HSQLDB JavaSystem.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.lib.java;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.DriverManager;
import java.util.Properties;
import java.text.Collator;
import java.io.RandomAccessFile;

// fredt@users 20020320 - patch 1.7.0 - JDBC 2 support and error trapping
// fredt@users 20021030 - patch 1.7.2 - updates

/**
 * Handles the differences between JDK 1.1.x and 1.2.x and above
 *
 * @author fredt@users
 * @version 1.8.0
 */
public class JavaSystem {

    // variables to track rough count on object creation, to use in gc
    public static int gcFrequency;
    public static int memoryRecords;

    // Garbage Collection
    public static void gc() {

        if ((gcFrequency > 0) && (memoryRecords > gcFrequency)) {
            memoryRecords = 0;

            System.gc();
        }
    }

    /**
     * Arguments are never null.
     */
    public static int CompareIngnoreCase(String a, String b) {

//#ifdef JAVA2FULL
        return a.compareToIgnoreCase(b);

//#else
/*
        return a.toUpperCase().compareTo(b.toUpperCase());
*/

//#endif JAVA2
    }

    public static double parseDouble(String s) {

//#ifdef JAVA2FULL
        return Double.parseDouble(s);

//#else
/*
        return new Double(s).doubleValue();
*/

//#endif JAVA2
    }

    public static BigInteger getUnscaledValue(BigDecimal o) {

//#ifdef JAVA2FULL
        return o.unscaledValue();

//#else
/*
        int scale = o.scale();
        return o.movePointRight(scale).toBigInteger();
*/

//#endif
    }

    public static void setLogToSystem(boolean value) {

//#ifdef JAVA2FULL
        try {
            PrintWriter newPrintWriter = (value) ? new PrintWriter(System.out)
                                                 : null;

            DriverManager.setLogWriter(newPrintWriter);
        } catch (Exception e) {}

//#else
/*
        try {
            PrintStream newOutStream = (value) ? System.out
                                               : null;
            DriverManager.setLogStream(newOutStream);
        } catch (Exception e){}
*/

//#endif
    }

    public static void deleteOnExit(File f) {

//#ifdef JAVA2FULL
        f.deleteOnExit();

//#endif
    }

    public static void saveProperties(Properties props, String name,
                                      OutputStream os) throws IOException {

//#ifdef JAVA2FULL
        props.store(os, name);

//#else
/*
        props.save(os, name);
*/

//#endif
    }

    public static void runFinalizers() {

//#ifdef JAVA2FULL
        System.runFinalizersOnExit(true);

//#endif
    }

    public static boolean createNewFile(File file) {

//#ifdef JAVA2FULL
        try {
            return file.createNewFile();
        } catch (IOException e) {}

        return false;

//#else
/*
        return true;
*/

//#endif
    }

    public static void setRAFileLength(RandomAccessFile raFile,
                                       long length) throws IOException {

//#ifdef JAVA2FULL
        raFile.setLength(length);

//#endif
    }
}

Other HSQLDB examples (source code examples)

Here is a short list of links related to this HSQLDB JavaSystem.java source code file:

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