Java example source code file (ParserTest.java)

This example Java source code file (ParserTest.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

biginteger, diagnosticcommand, exception, expected, illegalargumentexception, math, object, parsertest, parsing, recording, string, whitebox

The ParserTest.java Java example source code

/*
 * Copyright (c) 2012, 2013, 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.
 */

/*
 * @test ParserTest
 * @summary Test that the diagnostic command arguemnt parser works
 * @library /testlibrary /testlibrary/whitebox
 * @build ParserTest
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI ParserTest
 */

import java.math.BigInteger;

import sun.hotspot.parser.DiagnosticCommand;
import sun.hotspot.parser.DiagnosticCommand.DiagnosticArgumentType;
import sun.hotspot.WhiteBox;

public class ParserTest {
    WhiteBox wb;

    public ParserTest() throws Exception {
        wb = WhiteBox.getWhiteBox();

        testNanoTime();
        testJLong();
        testBool();
        testQuotes();
        testMemorySize();
    }

    public static void main(String... args) throws Exception  {
         new ParserTest();
    }

    public void testNanoTime() throws Exception {
        String name = "name";
        DiagnosticCommand arg = new DiagnosticCommand(name,
                "desc", DiagnosticArgumentType.NANOTIME,
                false, "0");
        DiagnosticCommand[] args = {arg};

        BigInteger bi = new BigInteger("7");
        //These should work
        parse(name, bi.toString(), name + "=7ns", args);

        bi = bi.multiply(BigInteger.valueOf(1000));
        parse(name, bi.toString(), name + "=7us", args);

        bi = bi.multiply(BigInteger.valueOf(1000));
        parse(name, bi.toString(), name + "=7ms", args);

        bi = bi.multiply(BigInteger.valueOf(1000));
        parse(name, bi.toString(), name + "=7s", args);

        bi = bi.multiply(BigInteger.valueOf(60));
        parse(name, bi.toString() , name + "=7m", args);

        bi = bi.multiply(BigInteger.valueOf(60));
        parse(name, bi.toString() , name + "=7h", args);

        bi = bi.multiply(BigInteger.valueOf(24));
        parse(name, bi.toString() , name + "=7d", args);

        parse(name, "0", name + "=0", args);

        shouldFail(name + "=7xs", args);
        shouldFail(name + "=7mms", args);
        shouldFail(name + "=7f", args);
        //Currently, only value 0 is allowed without unit
        shouldFail(name + "=7", args);
    }

    public void testJLong() throws Exception {
        String name = "name";
        DiagnosticCommand arg = new DiagnosticCommand(name,
                "desc", DiagnosticArgumentType.JLONG,
                false, "0");
        DiagnosticCommand[] args = {arg};

        wb.parseCommandLine(name + "=10", args);
        parse(name, "10", name + "=10", args);
        parse(name, "-5", name + "=-5", args);

        //shouldFail(name + "=12m", args); <-- should fail, doesn't
    }

    public void testBool() throws Exception {
        String name = "name";
        DiagnosticCommand arg = new DiagnosticCommand(name,
                "desc", DiagnosticArgumentType.BOOLEAN,
                false, "false");
        DiagnosticCommand[] args = {arg};

        parse(name, "true", name + "=true", args);
        parse(name, "false", name + "=false", args);
        parse(name, "true", name, args);

        //Empty commandline to parse, tests default value
        //of the parameter "name"
        parse(name, "false", "", args);
    }

    public void testQuotes() throws Exception {
        String name = "name";
        DiagnosticCommand arg1 = new DiagnosticCommand(name,
                "desc", DiagnosticArgumentType.STRING,
                false, null);
        DiagnosticCommand arg2 = new DiagnosticCommand("arg",
                "desc", DiagnosticArgumentType.STRING,
                false, null);
        DiagnosticCommand[] args = {arg1, arg2};

        // try with a quoted value
        parse(name, "Recording 1", name + "=\"Recording 1\"", args);
        // try with a quoted argument
        parse(name, "myrec", "\"" + name + "\"" + "=myrec", args);
        // try with both a quoted value and a quoted argument
        parse(name, "Recording 1", "\"" + name + "\"" + "=\"Recording 1\"", args);

        // now the same thing but with other arguments after

        // try with a quoted value
        parse(name, "Recording 1", name + "=\"Recording 1\",arg=value", args);
        // try with a quoted argument
        parse(name, "myrec", "\"" + name + "\"" + "=myrec,arg=value", args);
        // try with both a quoted value and a quoted argument
        parse(name, "Recording 1", "\"" + name + "\"" + "=\"Recording 1\",arg=value", args);
    }

    public void testMemorySize() throws Exception {
        String name = "name";
        String defaultValue = "1024";
        DiagnosticCommand arg = new DiagnosticCommand(name,
                "desc", DiagnosticArgumentType.MEMORYSIZE,
                false, defaultValue);
        DiagnosticCommand[] args = {arg};

        BigInteger bi = new BigInteger("7");
        parse(name, bi.toString(), name + "=7b", args);

        bi = bi.multiply(BigInteger.valueOf(1024));
        parse(name, bi.toString(), name + "=7k", args);

        bi = bi.multiply(BigInteger.valueOf(1024));
        parse(name, bi.toString(), name + "=7m", args);

        bi = bi.multiply(BigInteger.valueOf(1024));
        parse(name, bi.toString(), name + "=7g", args);
        parse(name, defaultValue, "", args);

        //shouldFail(name + "=7gg", args); <---- should fail, doesn't
        //shouldFail(name + "=7t", args);  <----- should fail, doesn't
    }

    public void parse(String searchName, String expectedValue,
            String cmdLine, DiagnosticCommand[] argumentTypes) throws Exception {
        //parseCommandLine will return an object array that looks like
        //{<name of parsed object>,  ... }
        Object[] res = wb.parseCommandLine(cmdLine, argumentTypes);
        for (int i = 0; i < res.length-1; i+=2) {
            String parsedName = (String) res[i];
            if (searchName.equals(parsedName)) {
                String parsedValue = (String) res[i+1];
                if (expectedValue.equals(parsedValue)) {
                    return;
                } else {
                    throw new Exception("Parsing of cmdline '" + cmdLine + "' failed!\n"
                            + searchName + " parsed as " + parsedValue
                            + "! Expected: " + expectedValue);
                }
            }
        }
        throw new Exception(searchName + " not found as a parsed Argument!");
    }

    private void shouldFail(String argument, DiagnosticCommand[] argumentTypes) throws Exception {
        try {
            wb.parseCommandLine(argument, argumentTypes);
            throw new Exception("Parser accepted argument: " + argument);
        } catch (IllegalArgumentException e) {
            //expected
        }
    }
}