1 /*
2  * Copyright (C) 2007 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 dalvik.system;
18 
19 /**
20  * Provides a simple {@link ClassLoader} implementation that operates on a list
21  * of files and directories in the local file system, but does not attempt to
22  * load classes from the network. Android uses this class for its system class
23  * loader and for its application class loader(s).
24  */
25 public class PathClassLoader extends BaseDexClassLoader {
26     /**
27      * Creates a {@code PathClassLoader} that operates on a given list of files
28      * and directories. This method is equivalent to calling
29      * {@link #PathClassLoader(String, String, ClassLoader)} with a
30      * {@code null} value for the second argument (see description there).
31      *
32      * @param dexPath the list of jar/apk files containing classes and
33      * resources, delimited by {@code File.pathSeparator}, which
34      * defaults to {@code ":"} on Android
35      * @param parent the parent class loader
36      */
PathClassLoader(String dexPath, ClassLoader parent)37     public PathClassLoader(String dexPath, ClassLoader parent) {
38         super(dexPath, null, null, parent);
39     }
40 
41     /**
42      * Creates a {@code PathClassLoader} that operates on two given
43      * lists of files and directories. The entries of the first list
44      * should be one of the following:
45      *
46      * <ul>
47      * <li>JAR/ZIP/APK files, possibly containing a "classes.dex" file as
48      * well as arbitrary resources.
49      * <li>Raw ".dex" files (not inside a zip file).
50      * </ul>
51      *
52      * The entries of the second list should be directories containing
53      * native library files.
54      *
55      * @param dexPath the list of jar/apk files containing classes and
56      * resources, delimited by {@code File.pathSeparator}, which
57      * defaults to {@code ":"} on Android
58      * @param librarySearchPath the list of directories containing native
59      * libraries, delimited by {@code File.pathSeparator}; may be
60      * {@code null}
61      * @param parent the parent class loader
62      */
PathClassLoader(String dexPath, String librarySearchPath, ClassLoader parent)63     public PathClassLoader(String dexPath, String librarySearchPath, ClassLoader parent) {
64         super(dexPath, null, librarySearchPath, parent);
65     }
66 }
67