/*

 * Copyright (c) 2016, 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.  Oracle designates this

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

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

 *

 * 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 jdk.internal.jshell.tool;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.PrintStream;

import java.util.Collections;

import java.util.EnumSet;

import java.util.Set;

import javax.lang.model.SourceVersion;

import javax.tools.Tool;

import jdk.jshell.tool.JavaShellToolBuilder;

/**

 * Provider for launching the jshell tool.

 */

public class JShellToolProvider implements Tool {

    /**

     * Returns the name of this Java shell tool provider.

     *

     * @return the name of this tool provider

     */

    @Override

    public String name() {

        return "jshell";

    }

    /**

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

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

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

     *

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

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

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

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

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

     * if null

     * @param arguments arguments to pass to the tool

     * @return 0 for success; nonzero otherwise

     * @throws NullPointerException if the array of arguments contains

     * any {@code null} elements.

     */

    @Override

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

        InputStream xin =

                (in == null)

                        ? System.in

                        : in;

        PrintStream xout =

                (out == null)

                        ? System.out

                        : (out instanceof PrintStream)

                                ? (PrintStream) out

                                : new PrintStream(out);

        PrintStream xerr =

                (err == null)

                        ? System.err

                        : (err instanceof PrintStream)

                                ? (PrintStream) err

                                : new PrintStream(err);

        try {

            JavaShellToolBuilder

                    .builder()

                    .in(xin, null)

                    .out(xout)

                    .err(xerr)

                    .run(arguments);

            return 0;

        } catch (Throwable ex) {

            xerr.println(ex.getMessage());

            return 1;

        }

    }

    /**

     * Returns the source versions of the jshell tool.

     * @return a set of supported source versions

     */

    @Override

    public Set<SourceVersion> getSourceVersions() {

        return Collections.unmodifiableSet(

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

    }

    /**

     * Launch the tool.

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

     * @throws Exception an unexpected fatal exception

     */

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

        JavaShellToolBuilder

                .builder()

                .run(arguments);

    }

}