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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.multidex;
     18 
     19 import java.io.FileNotFoundException;
     20 import java.io.IOException;
     21 import java.io.InputStream;
     22 import java.util.Enumeration;
     23 import java.util.Iterator;
     24 import java.util.NoSuchElementException;
     25 import java.util.zip.ZipEntry;
     26 import java.util.zip.ZipFile;
     27 
     28 /**
     29  * A zip element.
     30  */
     31 class ArchivePathElement implements ClassPathElement {
     32 
     33     static class DirectoryEntryException extends IOException {
     34     }
     35 
     36     private final ZipFile archive;
     37 
     38     public ArchivePathElement(ZipFile archive) {
     39         this.archive = archive;
     40     }
     41 
     42     @Override
     43     public InputStream open(String path) throws IOException {
     44         ZipEntry entry = archive.getEntry(path);
     45         if (entry == null) {
     46             throw new FileNotFoundException("File \"" + path + "\" not found");
     47         } else if (entry.isDirectory()) {
     48             throw new DirectoryEntryException();
     49         } else {
     50             return archive.getInputStream(entry);
     51         }
     52     }
     53 
     54     @Override
     55     public void close() throws IOException {
     56         archive.close();
     57     }
     58 
     59     @Override
     60     public Iterable<String> list() {
     61         return new Iterable<String>() {
     62 
     63             @Override
     64             public Iterator<String> iterator() {
     65                 return new Iterator<String>() {
     66                     Enumeration<? extends ZipEntry> delegate = archive.entries();
     67                     ZipEntry next = null;
     68 
     69                     @Override
     70                     public boolean hasNext() {
     71                         while (next == null && delegate.hasMoreElements()) {
     72                             next = delegate.nextElement();
     73                             if (next.isDirectory()) {
     74                                 next = null;
     75                             }
     76                         }
     77                         return next != null;
     78                     }
     79 
     80                     @Override
     81                     public String next() {
     82                         if (hasNext()) {
     83                             String name = next.getName();
     84                             next = null;
     85                             return name;
     86                         } else {
     87                             throw new NoSuchElementException();
     88                         }
     89                     }
     90 
     91                     @Override
     92                     public void remove() {
     93                         throw new UnsupportedOperationException();
     94                     }
     95                 };
     96             }
     97         };
     98     }
     99 
    100 }
    101