1 /*

     2  * Copyright (c) 2016, 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.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

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

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

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

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

    15  * accompanied this code).

    16  *

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

    18  * 2 along with this work; if not, write to the Free Software Foundation,

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

    20  *

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

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

    23  * questions.

    24  */

    25 

    26 package jdk.internal.jshell.tool;

    27 

    28 import java.io.InputStream;

    29 import java.io.OutputStream;

    30 import java.io.PrintStream;

    31 import java.util.Collections;

    32 import java.util.EnumSet;

    33 import java.util.Set;

    34 import javax.lang.model.SourceVersion;

    35 import javax.tools.Tool;

    36 import jdk.jshell.tool.JavaShellToolBuilder;

    37 

    38 /**

    39  * Provider for launching the jshell tool.

    40  */

    41 public class JShellToolProvider implements Tool {

    42 

    43     /**

    44      * Returns the name of this Java shell tool provider.

    45      *

    46      * @return the name of this tool provider

    47      */

    48     @Override

    49     public String name() {

    50         return "jshell";

    51     }

    52 

    53     /**

    54      * Run the jshell tool.  The streams {@code out} and {@code err} are

    55      * converted to {@code PrintStream} if they are not already.

    56      * Any {@code Exception} is caught, printed and results in a non-zero return.

    57      *

    58      * @param in command line input (snippets and commands), and execution

    59      * "standard" input; use System.in if null

    60      * @param out command line output, feedback including errors, and execution

    61      * "standard" output; use System.out if null

    62      * @param err start-up errors and execution "standard" error; use System.err

    63      * if null

    64      * @param arguments arguments to pass to the tool

    65      * @return 0 for success; nonzero otherwise

    66      * @throws NullPointerException if the array of arguments contains

    67      * any {@code null} elements.

    68      */

    69     @Override

    70     public int run(InputStream in, OutputStream out, OutputStream err, String... arguments) {

    71         InputStream xin =

    72                 (in == null)

    73                         ? System.in

    74                         : in;

    75         PrintStream xout =

    76                 (out == null)

    77                         ? System.out

    78                         : (out instanceof PrintStream)

    79                                 ? (PrintStream) out

    80                                 : new PrintStream(out);

    81         PrintStream xerr =

    82                 (err == null)

    83                         ? System.err

    84                         : (err instanceof PrintStream)

    85                                 ? (PrintStream) err

    86                                 : new PrintStream(err);

    87         try {

    88             JavaShellToolBuilder

    89                     .builder()

    90                     .in(xin, null)

    91                     .out(xout)

    92                     .err(xerr)

    93                     .run(arguments);

    94             return 0;

    95         } catch (Throwable ex) {

    96             xerr.println(ex.getMessage());

    97             return 1;

    98         }

    99     }

   100 

   101     /**

   102      * Returns the source versions of the jshell tool.

   103      * @return a set of supported source versions

   104      */

   105     @Override

   106     public Set<SourceVersion> getSourceVersions() {

   107         return Collections.unmodifiableSet(

   108                 EnumSet.range(SourceVersion.RELEASE_9, SourceVersion.latest()));

   109     }

   110 

   111     /**

   112      * Launch the tool.

   113      * @param arguments the command-line arguments (including options), if any

   114      * @throws Exception an unexpected fatal exception

   115      */

   116     public static void main(String[] arguments) throws Exception {

   117         JavaShellToolBuilder

   118                 .builder()

   119                 .run(arguments);

   120     }

   121 }