javaenvutils.java

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            // Sun's layout.
            jExecutable = findInDir(JAVA_HOME + "/sh", command);
        }

        if (jExecutable == null) {
            jExecutable = findInDir(JAVA_HOME + "/bin", command);
        }

        if (jExecutable != null) {
            return jExecutable.getAbsolutePath();
        } else {
            // Unfortunately on Windows java.home doesn't always refer
            // to the correct location, so we need to fall back to
            // assuming java is somewhere on the PATH.
            return addExtension(command);
        }
    }

    /**
     * Finds an executable that is part of a JDK installation based on
     * the java.home system property.
     *
     * <p>You typically find them in <code>JAVA_HOME/bin</code> if
     * <code>JAVA_HOME</code> points to your JDK installation.</p>
     * @param command the java executable to find.
     * @return the path to the command.
     * @since Ant 1.5
     */
    public static String getJdkExecutable(String command) {
        if (IS_NETWARE) {
            // Extrapolating from:
            // "NetWare may have a "java" in that directory, but 99% of
            // the time, you don't want to execute it" -- Jeff Tulley
            // <[e-mail]>
            return command;
        }

        File jExecutable = null;

        if (IS_AIX) {
            // On IBM's JDK 1.2 the directory layout is different, 1.3 follows
            // Sun's layout.
            jExecutable = findInDir(JAVA_HOME + "/../sh", command);
        }

        if (jExecutable == null) {
            jExecutable = findInDir(JAVA_HOME + "/../bin", command);
        }

        if (jExecutable != null) {
            return jExecutable.getAbsolutePath();
        } else {
            // fall back to JRE bin directory, also catches JDK 1.0 and 1.1
            // where java.home points to the root of the JDK and Mac OS X where
            // the whole directory layout is different from Sun's
            return getJreExecutable(command);
        }
    }

    /**
     * Adds a system specific extension to the name of an executable.
     *
     * @since Ant 1.5
     */
    private static String addExtension(String command) {
        // This is the most common extension case - exe for windows and OS/2,
        // nothing for *nix.
        return command + (IS_DOS ? ".exe" : "");
    }

    /**
     * Look for an executable in a given directory.
     *
     * @return null if the executable cannot be found.
     */
    private static File findInDir(String dirName, String commandName) {
        File dir = FILE_UTILS.normalize(dirName);
        File executable = null;
        if (dir.exists()) {
            executable = new File(dir, addExtension(commandName));
            if (!executable.exists()) {
                executable = null;
            }
        }
        return executable;
    }

    /**
     * demand creation of the package list.
     * When you add a new package, add a new test below.
     */

    private static void buildJrePackages() {
        jrePackages = new Vector();
        switch(javaVersionNumber) {
            case VERSION_1_6:
            case VERSION_1_5:
                //In Java1.5, the apache stuff moved.
                jrePackages.addElement("com.sun.org.apache");
                //fall through.
            case VERSION_1_4:
                if (javaVersionNumber == VERSION_1_4) {
                    jrePackages.addElement("org.apache.crimson");
                    jrePackages.addElement("org.apache.xalan");
                    jrePackages.addElement("org.apache.xml");
                    jrePackages.addElement("org.apache.xpath");
                }
                jrePackages.addElement("org.ietf.jgss");
                jrePackages.addElement("org.w3c.dom");
                jrePackages.addElement("org.xml.sax");
                // fall through
            case VERSION_1_3:
                jrePackages.addElement("org.omg");
                jrePackages.addElement("com.sun.corba");
                jrePackages.addElement("com.sun.jndi");
                jrePackages.addElement("com.sun.media");
                jrePackages.addElement("com.sun.naming");
                jrePackages.addElement("com.sun.org.omg");
                jrePackages.addElement("com.sun.rmi");
                jrePackages.addElement("sunw.io");
                jrePackages.addElement("sunw.util");
                // fall through
            case VERSION_1_2:
                jrePackages.addElement("com.sun.java");
                jrePackages.addElement("com.sun.image");
                // are there any here that we forgot?
                // fall through
            case VERSION_1_1:
            default:
                //things like sun.reflection, sun.misc, sun.net
                jrePackages.addElement("sun");
                jrePackages.addElement("java");
                jrePackages.addElement("javax");
                break;
        }
    }

    /**
     * Testing helper method; kept here for unification of changes.
     * @return a list of test classes depending on the java version.
     */
    public static Vector getJrePackageTestCases() {
        Vector tests = new Vector();
        tests.addElement("java.lang.Object");
        switch(javaVersionNumber) {
            case VERSION_1_6:
            case VERSION_1_5:
                tests.addElement(
                    "com.sun.org.apache.xerces.internal.jaxp.datatype.DatatypeFactoryImpl ");
                // Fall tru
            case VERSION_1_4:
                tests.addElement("sun.audio.AudioPlayer");
                if (javaVersionNumber == VERSION_1_4) {
                    tests.addElement("org.apache.crimson.parser.ContentModel");
                    tests.addElement("org.apache.xalan.processor.ProcessorImport");
                    tests.addElement("org.apache.xml.utils.URI");
                    tests.addElement("org.apache.xpath.XPathFactory");
                }
                tests.addElement("org.ietf.jgss.Oid");
                tests.addElement("org.w3c.dom.Attr");
                tests.addElement("org.xml.sax.XMLReader");
                // fall through
            case VERSION_1_3:
                tests.addElement("org.omg.CORBA.Any");
                tests.addElement("com.sun.corba.se.internal.corba.AnyImpl");
                tests.addElement("com.sun.jndi.ldap.LdapURL");
                tests.addElement("com.sun.media.sound.Printer");
                tests.addElement("com.sun.naming.internal.VersionHelper");
                tests.addElement("com.sun.org.omg.CORBA.Initializer");
                tests.addElement("sunw.io.Serializable");
                tests.addElement("sunw.util.EventListener");
                // fall through
            case VERSION_1_2:
                tests.addElement("javax.accessibility.Accessible");
                tests.addElement("sun.misc.BASE64Encoder");
                tests.addElement("com.sun.image.codec.jpeg.JPEGCodec");
                // fall through
            case VERSION_1_1:
            default:
                //things like sun.reflection, sun.misc, sun.net
                tests.addElement("sun.reflect.SerializationConstructorAccessorImpl");
                tests.addElement("sun.net.www.http.HttpClient");
                tests.addElement("sun.audio.AudioPlayer");
                break;
        }
        return tests;
    }
    /**
     * get a vector of strings of packages built into
     * that platforms runtime jar(s)
     * @return list of packages.
     */
    public static Vector getJrePackages() {
        if (jrePackages == null) {
            buildJrePackages();
        }
        return jrePackages;
    }

    /**
     *
     * Writes the command into a temporary DCL script and returns the
     * corresponding File object.
     * It is the job of the caller to delete the file on exit.
     * @param cmd the command.
     * @return the file containing the command.
     * @throws IOException if there is an error writing to the file.
     */
    public static File createVmsJavaOptionFile(String[] cmd)
            throws IOException {
        File script = FILE_UTILS.createTempFile("ANT", ".JAVA_OPTS", null, false, true);
        PrintWriter out = null;
        try {
            out = new PrintWriter(new BufferedWriter(new FileWriter(script)));
            for (int i = 0; i < cmd.length; i++) {
                out.println(cmd[i]);
            }
        } finally {
            FileUtils.close(out);
        }
        return script;
    }

    /**
     * Return the value of ${java.home}
     * @return the java home value.
     */
    public static String getJavaHome() {
        return JAVA_HOME;
    }
}