Home | History | Annotate | Download | only in support 
      1 /*
      2  * Copyright (C) 2009 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 package tests.support;
     17 
     18 import java.io.File;
     19 import java.net.URL;
     20 import java.net.URLClassLoader;
     21 
     22 import dalvik.system.DexClassLoader;
     23 
     24 /**
     25  * Support class for creating a file-based ClassLoader. Delegates to either
     26  * Dalvik's PathClassLoader or the RI's URLClassLoader, but does so by-name.
     27  * This allows us to run corresponding tests in both environments.
     28  */
     29 public abstract class Support_ClassLoader {
     30 
     31     public abstract ClassLoader getClassLoader(URL url, ClassLoader parent);
     32 
     33     public static ClassLoader getInstance(URL url, ClassLoader parent) {
     34         try {
     35             Support_ClassLoader factory;
     36 
     37             if ("Dalvik".equals(System.getProperty("java.vm.name"))) {
     38                 factory = (Support_ClassLoader)Class.forName(
     39                     "tests.support.Support_ClassLoader$Dalvik").newInstance();
     40             } else {
     41                 factory = (Support_ClassLoader)Class.forName(
     42                     "tests.support.Support_ClassLoader$RefImpl").newInstance();
     43             }
     44 
     45             return factory.getClassLoader(url, parent);
     46         } catch (Exception ex) {
     47             throw new RuntimeException("Unable to create ClassLoader", ex);
     48         }
     49     }
     50 
     51     /**
     52      * Implementation for Dalvik. Uses the DexClassLoader, so we can write
     53      * temporary DEX files to a special directory. We don't want to spoil the
     54      * system's DEX cache with our files. Also, we might not have write access
     55      * to the system's DEX cache at all (which is the case when we're running
     56      * CTS).
     57      */
     58     static class Dalvik extends Support_ClassLoader {
     59 
     60         private static File tmp;
     61 
     62         static {
     63             tmp = new File(System.getProperty("java.io.tmpdir"), "dex-cache");
     64             tmp.mkdirs();
     65         }
     66 
     67         @Override
     68         public ClassLoader getClassLoader(URL url, ClassLoader parent) {
     69             return new DexClassLoader(url.getPath(), tmp.getAbsolutePath(),
     70                     null, parent);
     71         }
     72     }
     73 
     74     /**
     75      * Implementation for the reference implementation. Nothing interesting to
     76      * see here. Please get along.
     77      */
     78     static class RefImpl extends Support_ClassLoader {
     79         @Override
     80         public ClassLoader getClassLoader(URL url, ClassLoader parent) {
     81             return new URLClassLoader(new URL[] { url }, parent);
     82         }
     83     }
     84 }
     85