1 /*

     2  * Copyright (c) 2008, 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 com.sun.tools.javac.file;

    27 

    28 import java.io.IOException;

    29 import java.nio.file.FileSystems;

    30 import java.nio.file.Files;

    31 import java.nio.file.Path;

    32 import java.nio.file.spi.FileSystemProvider;

    33 import java.util.ArrayList;

    34 import java.util.Collections;

    35 import java.util.List;

    36 import java.util.StringTokenizer;

    37 import java.util.jar.Attributes;

    38 import java.util.jar.JarFile;

    39 import java.util.jar.Manifest;

    40 

    41 import com.sun.tools.javac.util.Context;

    42 

    43 /**

    44  * Get meta-info about files. Default direct (non-caching) implementation.

    45  * @see CacheFSInfo

    46  *

    47  * <p><b>This is NOT part of any supported API.

    48  * If you write code that depends on this, you do so at your own risk.

    49  * This code and its internal interfaces are subject to change or

    50  * deletion without notice.</b>

    51  */

    52 public class FSInfo {

    53 

    54     /** Get the FSInfo instance for this context.

    55      *  @param context the context

    56      *  @return the Paths instance for this context

    57      */

    58     public static FSInfo instance(Context context) {

    59         FSInfo instance = context.get(FSInfo.class);

    60         if (instance == null)

    61             instance = new FSInfo();

    62         return instance;

    63     }

    64 

    65     protected FSInfo() {

    66     }

    67 

    68     protected FSInfo(Context context) {

    69         context.put(FSInfo.class, this);

    70     }

    71 

    72     public Path getCanonicalFile(Path file) {

    73         try {

    74             return file.toRealPath();

    75         } catch (IOException e) {

    76             return file.toAbsolutePath().normalize();

    77         }

    78     }

    79 

    80     public boolean exists(Path file) {

    81         return Files.exists(file);

    82     }

    83 

    84     public boolean isDirectory(Path file) {

    85         return Files.isDirectory(file);

    86     }

    87 

    88     public boolean isFile(Path file) {

    89         return Files.isRegularFile(file);

    90     }

    91 

    92     public List<Path> getJarClassPath(Path file) throws IOException {

    93         Path parent = file.getParent();

    94         try (JarFile jarFile = new JarFile(file.toFile())) {

    95             Manifest man = jarFile.getManifest();

    96             if (man == null)

    97                 return Collections.emptyList();

    98 

    99             Attributes attr = man.getMainAttributes();

   100             if (attr == null)

   101                 return Collections.emptyList();

   102 

   103             String path = attr.getValue(Attributes.Name.CLASS_PATH);

   104             if (path == null)

   105                 return Collections.emptyList();

   106 

   107             List<Path> list = new ArrayList<>();

   108 

   109             for (StringTokenizer st = new StringTokenizer(path);

   110                  st.hasMoreTokens(); ) {

   111                 String elt = st.nextToken();

   112                 Path f = FileSystems.getDefault().getPath(elt);

   113                 if (!f.isAbsolute() && parent != null)

   114                     f = parent.resolve(f).toAbsolutePath();

   115                 list.add(f);

   116             }

   117 

   118             return list;

   119         }

   120     }

   121 

   122     private FileSystemProvider jarFSProvider;

   123 

   124     public synchronized FileSystemProvider getJarFSProvider() {

   125         if (jarFSProvider != null) {

   126             return jarFSProvider;

   127         }

   128         for (FileSystemProvider provider: FileSystemProvider.installedProviders()) {

   129             if (provider.getScheme().equals("jar")) {

   130                 return (jarFSProvider = provider);

   131             }

   132         }

   133         return null;

   134     }

   135 

   136 }