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