1 /*

     2  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 package p;

    25 

    26 import java.io.*;

    27 import com.sun.tools.javadoc.Main;

    28 

    29 public class OutputRedirect {

    30 

    31     public static void main(String[] args) {

    32         PrintStream originalOutput = System.out;

    33         try {

    34             doTest();

    35         } finally {

    36             // restore things

    37             System.setOut(originalOutput);

    38         }

    39     }

    40 

    41     static void doTest() {

    42         ByteArrayOutputStream redirectedOutput = new ByteArrayOutputStream();

    43         PrintStream originalOutput = System.out;

    44 

    45         // redirect System.out to a buffer

    46         System.setOut(new PrintStream(redirectedOutput));

    47 

    48         PrintWriter sink = new PrintWriter(new ByteArrayOutputStream());

    49 

    50         // execute javadoc

    51         int result = Main.execute("javadoc", sink, sink, sink,

    52                                   "com.sun.tools.doclets.standard.Standard",

    53                                   new String[] {"p"}

    54                                   );

    55 

    56 

    57         // test whether javadoc did any output to System.out

    58         if (redirectedOutput.toByteArray().length > 0) {

    59             originalOutput.println("Test failed; here's what javadoc wrote on its standard output:");

    60             originalOutput.println(redirectedOutput.toString());

    61             throw new Error("javadoc output wasn\'t properly redirected");

    62         } else if (result != 0) {

    63             throw new Error("javadoc run failed");

    64         } else {

    65             originalOutput.println("OK, good");

    66         }

    67     }

    68 }