1 /*
   2  * Copyright (c) 2014, 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.tools.jlink.internal;
  27 
  28 import java.io.IOException;
  29 import java.io.InputStream;
  30 import java.io.UncheckedIOException;
  31 import java.nio.file.Path;
  32 import java.util.Objects;
  33 import java.util.jar.JarFile;
  34 import java.util.stream.Stream;
  35 import java.util.zip.ZipEntry;
  36 import java.util.zip.ZipFile;
  37 import jdk.internal.util.jar.VersionedStream;
  38 import jdk.tools.jlink.internal.Archive.Entry.EntryType;
  39 
  40 /**
  41  * An Archive backed by a jar file.
  42  */
  43 public abstract class JarArchive implements Archive {
  44 
  45     /**
  46      * An entry located in a jar file.
  47      */
  48     public class JarEntry extends Entry {
  49 
  50         private final long size;
  51         private final ZipEntry entry;
  52         private final ZipFile file;
  53 
  54         JarEntry(String path, String name, EntryType type, ZipFile file, ZipEntry entry) {
  55             super(JarArchive.this, path, name, type);
  56             this.entry = Objects.requireNonNull(entry);
  57             this.file = Objects.requireNonNull(file);
  58             size = entry.getSize();
  59         }
  60 
  61         /**
  62          * Returns the number of uncompressed bytes for this entry.
  63          */
  64         @Override
  65         public long size() {
  66             return size;
  67         }
  68 
  69         @Override
  70         public InputStream stream() throws IOException {
  71             return file.getInputStream(entry);
  72         }
  73     }
  74 
  75     private final Path file;
  76     private final String moduleName;
  77     private final Runtime.Version version;
  78     // currently processed JarFile
  79     private JarFile jarFile;
  80 
  81     protected JarArchive(String mn, Path file, Runtime.Version version) {
  82         Objects.requireNonNull(mn);
  83         Objects.requireNonNull(file);
  84         this.moduleName = mn;
  85         this.file = file;
  86         this.version = Objects.requireNonNull(version);
  87     }
  88 
  89     @Override
  90     public String moduleName() {
  91         return moduleName;
  92     }
  93 
  94     @Override
  95     public Path getPath() {
  96         return file;
  97     }
  98 
  99     @Override
 100     public Stream<Entry> entries() {
 101         try {
 102             if (jarFile == null) {
 103                 open();
 104             }
 105         } catch (IOException ioe) {
 106             throw new UncheckedIOException(ioe);
 107         }
 108         return VersionedStream.stream(jarFile)
 109                 .filter(je -> !je.isDirectory())
 110                 .map(this::toEntry);
 111     }
 112 
 113     abstract EntryType toEntryType(String entryName);
 114 
 115     abstract String getFileName(String entryName);
 116 
 117     abstract Entry toEntry(ZipEntry ze);
 118 
 119     @Override
 120     public void close() throws IOException {
 121         if (jarFile != null) {
 122             jarFile.close();
 123         }
 124     }
 125 
 126     @Override
 127     public void open() throws IOException {
 128         if (jarFile != null) {
 129             jarFile.close();
 130         }
 131         jarFile = new JarFile(file.toFile(), true, ZipFile.OPEN_READ, version);
 132     }
 133 
 134     protected JarFile getJarFile() {
 135         return jarFile;
 136     }
 137 }
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