Java example source code file (CheckDataVersion.java)

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

Learn more about this Java project at its project page.

Java - Java tags/keywords

bufferedreader, checkdataversion, datainputstream, dataversionkey, filereader, got, ioexception, jre\'s, object, privilegedaction, reflection, runtimeexception, security, string, test, the

The CheckDataVersion.java Java example source code

/*
 * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
/**
 *
 *
 * Check the consistency between the regression tests and the currency data in the JRE
 */

import java.io.*;
import java.lang.reflect.*;
import java.security.*;

class CheckDataVersion {
    static final String datafile = "tablea1.txt";
    static final String FILEVERSIONKEY = "FILEVERSION=";
    static final String DATAVERSIONKEY = "DATAVERSION=";
    static String fileVersion;
    static String dataVersion;
    static boolean checked = false;

    static void check() {
        if (!checked) {
            try {
                FileReader fr = new FileReader(new File(System.getProperty("test.src", "."), datafile));
                BufferedReader in = new BufferedReader(fr);
                String line;

                while ((line = in.readLine()) != null) {
                    if (line.startsWith(FILEVERSIONKEY)) {
                        fileVersion = line.substring(FILEVERSIONKEY.length());
                    }
                    if (line.startsWith(DATAVERSIONKEY)) {
                        dataVersion = line.substring(DATAVERSIONKEY.length());
                    }
                    if (fileVersion != null && dataVersion != null) {
                        break;
                    }
                }
            } catch (IOException ioe) {
                throw new RuntimeException(ioe);
            }

            AccessController.doPrivileged(new PrivilegedAction<Object>() {
                public Object run() {
                    try {
                        String sep = File.separator;
                        DataInputStream dis = new DataInputStream(new FileInputStream(System.getProperty("java.home")+sep+"lib"+sep+"currency.data"));
                        int magic = dis.readInt();
                        if (magic != 0x43757244) {
                            throw new RuntimeException("The magic number in the JRE's currency data is incorrect.  Expected: 0x43757244, Got: 0x"+magic);
                        }
                        int fileVerNumber = dis.readInt();
                        int dataVerNumber = dis.readInt();
                        if (Integer.parseInt(fileVersion) != fileVerNumber ||
                            Integer.parseInt(dataVersion) != dataVerNumber) {
                            throw new RuntimeException("Test data and JRE's currency data are inconsistent.  test: (file: "+fileVersion+" data: "+dataVersion+"), JRE: (file: "+fileVerNumber+" data: "+dataVerNumber+")");
                        }
System.out.println("test: (file: "+fileVersion+" data: "+dataVersion+"), JRE: (file: "+fileVerNumber+" data: "+dataVerNumber+")");
                    } catch (IOException ioe) {
                        throw new RuntimeException(ioe);
                    }
                    return null;
                }
            });
            checked = true;
        }
    }
}