/*

 * Copyright (c) 2004, 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.

 */

/**

 *

 */

import java.io.*;

import java.util.Properties;

public class JavaProcess {

    protected Process process = null;

    private String classname;

    private StringBuilder classArgs;

    private StringBuilder javaOptions;

    private static String java = System.getProperty("java.home")

                                 + File.separator + "bin"

                                 + File.separator + "java";

    public JavaProcess(String classname) {

        this(classname, "", "");

    }

    public JavaProcess(String classname, String classArgs) {

        this(classname, "", classArgs);

    }

    public JavaProcess(String classname, String javaOptions, String classArgs) {

        this.classname = classname;

        this.javaOptions = new StringBuilder(javaOptions);

        this.classArgs = new StringBuilder(classArgs);

    }

    /**

     * add java options to the java command

     */

    public void addOptions(String[] opts) {

        if (javaOptions != null && javaOptions.length() > 0) {

            javaOptions.append(" ");

        }

        for (int i = 0; i < opts.length; i++) {

            if (i != 0) {

                javaOptions.append(" ");

            }

            javaOptions.append(opts[i]);

        }

    }

    /**

     * add arguments to the class arguments

     */

    public void addArguments(String[] args) {

        if (classArgs != null && classArgs.length() > 0) {

            classArgs.append(" ");

        }

        for (int i = 0; i < args.length; i++) {

            if (i != 0) {

                classArgs.append(" ");

            }

            classArgs.append(args[i]);

        }

    }

    /**

     * start the java process

     */

    public void start() throws IOException {

        if (process != null) {

            return;

        }

        String javaCommand = java + " " + javaOptions + " "

                             + classname + " " + classArgs;

        System.out.println("exec'ing: " + javaCommand);

        process = Runtime.getRuntime().exec(javaCommand);

    }

    /**

     * destroy the java process

     */

    public void destroy() {

        if (process != null) {

            process.destroy();

        }

        process = null;

    }

    public int exitValue() {

        if (process != null) {

            return process.exitValue();

        }

        throw new RuntimeException("exitValue called with process == null");

    }

    public InputStream getErrorStream() {

        if (process != null) {

            return process.getErrorStream();

        }

        throw new RuntimeException(

                "getErrorStream() called with process == null");

    }

    public InputStream getInputStream() {

        if (process != null) {

            return process.getInputStream();

        }

        throw new RuntimeException(

                "getInputStream() called with process == null");

    }

    public OutputStream getOutputStream() {

        if (process != null) {

            return process.getOutputStream();

        }

        throw new RuntimeException(

                "getOutputStream() called with process == null");

    }

    public int waitFor() throws InterruptedException {

        if (process != null) {

            return process.waitFor();

        }

        throw new RuntimeException("waitFor() called with process == null");

    }

}