Java example source code file (ProcessResults.java)

This example Java source code file (ProcessResults.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

child, processresults, returned, runtimeexception, string, stringbuilder, warning

The ProcessResults.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.
 */

package test.java.awt.regtesthelpers.process;

import java.io.PrintStream;

/**
 * The calss incapsulates process related information and methods to
 * handle this information.
 *
 */

public class ProcessResults {
    private int exitValue;
    private StringBuilder stdout;
    private StringBuilder stderr;

    public ProcessResults() {
        exitValue = -1;
        stdout = new StringBuilder();
        stderr = new StringBuilder();
    }

    public synchronized int getExitValue () {
        return exitValue;
    }

    public synchronized String getStdOut() {
        return stdout.toString();
    }

   public synchronized String getStdErr() {
        return stderr.toString();
    }

    /** Prints child process standart output into the desired PrintStream.
     *
     * @param printTo PrintStraem where output have to be redirected
     */
    public synchronized void printProcessStandartOutput(PrintStream printTo) {
        if (stdout != null && stdout.length() > 0) {
            printTo.println("========= Child VM System.out ========");
            printTo.print(stdout);
            printTo.println("======================================");
        }
    }

    /** Prints child process error output into the desired PrintStream.
     *
     * @param printTo PrintStraem where output have to be redirected
     */
    public synchronized void printProcessErrorOutput(PrintStream printTo) {
        if (stderr != null && stderr.length() > 0) {
            printTo.println("========= Child VM System.err ========");
            printTo.print(stderr);
            printTo.println("======================================");
        }
    }

    /**  Prints child process error output into the desired {@code PrintStream},
     *   if child JVM error output contains any of the next words: "error",
     *   "exception". We cannot be sure that the test is failed when stderr is
     *   not empty, because in error stream could be written some debug information.
     *
     * @param err PrintStraem where output have to be redirected
     */
    public synchronized void verifyStdErr(PrintStream err) {
        if (stderr != null && ((stderr.toString().toLowerCase().indexOf("error") != -1)
                || (stderr.toString().toLowerCase().indexOf("exception") != -1)))
        {
            printProcessErrorOutput(err);
            throw new RuntimeException("WARNING: Child process  error stream " +
                    "is not empty!");
        }
    }

    /**  Throws new RuntimeException if the child JVM returns not 0 value.
     *
     * @param err PrintStraem where output have to be redirected
     */
    public synchronized void verifyProcessExitValue(PrintStream err) {
        if (exitValue != 0) {
            throw new RuntimeException("Child process returns not 0 value!" +
                    "Returned value is " + exitValue);
        }
    }

    public void verifyProcessExecutionResults(PrintStream err) {
        // the next functions are synchronized
        verifyStdErr(err);
        verifyProcessExitValue(err);
    }

    synchronized void appendToStdOut(char c) {
        stdout.append(c);
    }

    synchronized void appendToStdErr(char c) {
        stderr.append(c);
    }

    synchronized void setExitValue(int exitValue) {
        this.exitValue = exitValue;
    }
}