1/*
2 * Copyright (c) 2015, 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
26package com.sun.tools.javac.platform;
27
28import com.sun.tools.javac.main.Arguments;
29import com.sun.tools.javac.platform.PlatformProvider.PlatformNotSupported;
30import java.util.Optional;
31import java.util.ServiceLoader;
32import java.util.stream.StreamSupport;
33
34/** Internal utilities to work with PlatformDescriptions.
35 *
36 *  <p><b>This is NOT part of any supported API.
37 *  If you write code that depends on this, you do so at your own risk.
38 *  This code and its internal interfaces are subject to change or
39 *  deletion without notice.</b>
40 */
41public class PlatformUtils {
42
43    public static PlatformDescription lookupPlatformDescription(String platformString) {
44        int separator = platformString.indexOf(":");
45        String platformProviderName =
46                separator != (-1) ? platformString.substring(0, separator) : platformString;
47        String platformOptions =
48                separator != (-1) ? platformString.substring(separator + 1) : "";
49        Iterable<PlatformProvider> providers =
50                ServiceLoader.load(PlatformProvider.class, Arguments.class.getClassLoader());
51
52        return StreamSupport.stream(providers.spliterator(), false)
53                            .filter(provider -> StreamSupport.stream(provider.getSupportedPlatformNames()
54                                                                             .spliterator(),
55                                                                     false)
56                                                             .anyMatch(platformProviderName::equals))
57                            .findFirst()
58                            .flatMap(provider -> {
59                                try {
60                                    return Optional.of(provider.getPlatform(platformProviderName, platformOptions));
61                                } catch (PlatformNotSupported pns) {
62                                    return Optional.empty();
63                                }
64                            })
65                            .orElse(null);
66    }
67
68}
69