1 /*
2  * Copyright (C) 2014 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 com.android.dx.cf.direct.DirectClassFile;
20 import com.android.dx.cf.direct.StdAttributeFactory;
21 import java.io.ByteArrayOutputStream;
22 import java.io.File;
23 import java.io.FileNotFoundException;
24 import java.io.IOException;
25 import java.io.InputStream;
26 import java.util.ArrayList;
27 import java.util.List;
28 import java.util.regex.Pattern;
29 import java.util.zip.ZipException;
30 import java.util.zip.ZipFile;
31 
32 class Path {
33 
getClassPathElement(File file)34     static ClassPathElement getClassPathElement(File file)
35             throws ZipException, IOException {
36         if (file.isDirectory()) {
37             return new FolderPathElement(file);
38         } else if (file.isFile()) {
39             return new ArchivePathElement(new ZipFile(file));
40         } else if (file.exists()) {
41             throw new IOException("\"" + file.getPath() +
42                     "\" is not a directory neither a zip file");
43         } else {
44             throw new FileNotFoundException("File \"" + file.getPath() + "\" not found");
45         }
46     }
47 
48     List<ClassPathElement> elements = new ArrayList<ClassPathElement>();
49     private final String definition;
50     private final ByteArrayOutputStream baos = new ByteArrayOutputStream(40 * 1024);
51     private final byte[] readBuffer = new byte[20 * 1024];
52 
Path(String definition)53     Path(String definition) throws IOException {
54         this.definition = definition;
55         for (String filePath : definition.split(Pattern.quote(File.pathSeparator))) {
56             try {
57                 addElement(getClassPathElement(new File(filePath)));
58             } catch (IOException e) {
59                 throw new IOException("Wrong classpath: " + e.getMessage(), e);
60             }
61         }
62     }
63 
readStream(InputStream in, ByteArrayOutputStream baos, byte[] readBuffer)64     private static byte[] readStream(InputStream in, ByteArrayOutputStream baos, byte[] readBuffer)
65             throws IOException {
66         try {
67             for (;;) {
68                 int amt = in.read(readBuffer);
69                 if (amt < 0) {
70                     break;
71                 }
72 
73                 baos.write(readBuffer, 0, amt);
74             }
75         } finally {
76             in.close();
77         }
78         return baos.toByteArray();
79     }
80 
81     @Override
toString()82     public String toString() {
83         return definition;
84     }
85 
getElements()86     Iterable<ClassPathElement> getElements() {
87       return elements;
88     }
89 
addElement(ClassPathElement element)90     private void addElement(ClassPathElement element) {
91         assert element != null;
92         elements.add(element);
93     }
94 
getClass(String path)95     synchronized DirectClassFile getClass(String path) throws FileNotFoundException {
96         DirectClassFile classFile = null;
97         for (ClassPathElement element : elements) {
98             try {
99                 InputStream in = element.open(path);
100                 try {
101                     byte[] bytes = readStream(in, baos, readBuffer);
102                     baos.reset();
103                     classFile = new DirectClassFile(bytes, path, false);
104                     classFile.setAttributeFactory(StdAttributeFactory.THE_ONE);
105                     break;
106                 } finally {
107                     in.close();
108                 }
109             } catch (IOException e) {
110                 // search next element
111             }
112         }
113         if (classFile == null) {
114             throw new FileNotFoundException("File \"" + path + "\" not found");
115         }
116         return classFile;
117     }
118 }
119