Java example source code file (RunTest.java)

This example Java source code file (RunTest.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

badargs, bytearrayoutputstream, doclint, illegalargumentexception, ioexception, javafileobject, net, network, override, printstream, printwriter, security, securityexception, simplesecuritymanager, string, stringwriter, util, xmsgs

The RunTest.java Java example source code

/*
 * Copyright (c) 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
 * @bug 8006263
 * @summary Supplementary test cases needed for doclint
 */

import com.sun.source.util.JavacTask;
import com.sun.tools.doclint.DocLint;
import com.sun.tools.doclint.DocLint.BadArgs;
import com.sun.tools.javac.api.JavacTool;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.URI;
import java.security.Permission;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;

public class RunTest {
    static class SimpleSecurityManager extends SecurityManager {
        boolean allowExit = false;

        @Override
        public void checkExit(int status) {
            if (!allowExit)
                throw new SecurityException("System.exit(" + status + ")");
        }
        @Override
        public void checkPermission(Permission perm) { }

    }

    public static void main(String... args) throws Exception {
        // if no security manager already installed, install one to
        // prevent System.exit
        SimpleSecurityManager secmgr = null;
        if (System.getSecurityManager() == null) {
            System.setSecurityManager(secmgr = new SimpleSecurityManager() { });
        }

        try {
            new RunTest().run();
        } finally {
            if (secmgr != null)
                secmgr.allowExit = true;
        }
    }

    void run() throws Exception {
        testMain();
        testRun();
        testInit();
        testArgsNoFiles();

        if (errors > 0)
            throw new Exception(errors + " errors found");
    }

    void testMain() {
        System.err.println("test main(String[])");
        testMain(true, "-help");
        testMain(false, "-unknownOption");
    }

    void testMain(boolean expectOK, String... args) {
        try {
            DocLint.main(args);
            if (!expectOK)
                error("expected SecurityException (from System.exit) not thrown");
        } catch (SecurityException e) {
            System.err.println(e);
            if (expectOK)
                error("unexpected SecurityException caught");
        }
    }

    void testRun() throws BadArgs, IOException {
        System.err.println("test run(String[])");
        DocLint dl = new DocLint();
        String[] args = { "-help" };
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        PrintStream ps = new PrintStream(baos);
        PrintStream prev = System.out;
        try {
            System.setOut(ps);
            dl.run(args);
        } finally {
            System.setOut(prev);
        }
        ps.close();
        String stdout = baos.toString();

        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        dl.run(pw, args);
        pw.close();
        String direct = sw.toString();

        if (!stdout.equals(direct)) {
            error("unexpected output");
            System.err.println("EXPECT>>" + direct + "<<");
            System.err.println("FOUND>>" + stdout + "<<");
        }
    }

    void testInit() {
        System.err.println("test init");
        DocLint dl = new DocLint();
        String name = dl.getName();
        if (!Objects.equals(name, "doclint"))
            error("unexpected result for DocLint.getName()");

        List<? extends JavaFileObject> files =
                Arrays.asList(createFile("Test.java", "/** &0; */ class Test{ }"));
        String[] goodArgs = { "-Xmsgs" };
        testInit(true, goodArgs, files);

        String[] badArgs = { "-unknown" };
        testInit(false, badArgs, files);
    }

    void testInit(boolean expectOK, String[] args, List<? extends JavaFileObject> files) {
        JavacTool javac = JavacTool.create();
        JavacTask task = javac.getTask(null, null, null, null, null, files);
        try {
            DocLint dl = new DocLint();
            dl.init(task, args, true);
            if (!expectOK)
                error("expected IllegalArgumentException not thrown");
            task.call();
        } catch (IllegalArgumentException e) {
            System.err.println(e);
            if (expectOK)
                error("unexpected IllegalArgumentException caught");
        }
    }

    void testArgsNoFiles() throws BadArgs, IOException {
        System.err.println("test args, no files");
        DocLint dl = new DocLint();

        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        dl.run(pw, "-Xmsgs");
        pw.close();
        String out = sw.toString();

        String expect = "No files given";
        if (!Objects.equals(out.trim(), expect)) {
            error("unexpected output");
            System.err.println("EXPECT>>" + expect + "<<");
            System.err.println("FOUND>>" + out + "<<");
        }

    }

    JavaFileObject createFile(String name, final String body) {
        return new SimpleJavaFileObject(URI.create(name), JavaFileObject.Kind.SOURCE) {
            @Override
            public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
                return body;
            }
        };
    }

    void error(String msg) {
        System.err.println("Error: " + msg);
        errors++;
    }

    int errors;
}