1/*
2 * Copyright (C) 2016 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
17package com.android.layoutlib.bridge.intensive.util;
18
19import java.io.IOException;
20import java.util.HashMap;
21import java.util.Map;
22
23import libcore.io.Streams;
24
25/**
26 * Module class loader that loads classes from the test project.
27 */
28public class ModuleClassLoader extends ClassLoader {
29    private final Map<String, Class<?>> mClasses = new HashMap<>();
30    private String myModuleRoot;
31
32    /**
33     * @param moduleRoot The path to the module root
34     * @param parent The parent class loader
35     */
36    public ModuleClassLoader(String moduleRoot, ClassLoader parent) {
37        super(parent);
38        myModuleRoot = moduleRoot + (moduleRoot.endsWith("/") ? "" : "/");
39    }
40
41    @Override
42    protected Class<?> findClass(String name) throws ClassNotFoundException {
43        try {
44            return super.findClass(name);
45        } catch (ClassNotFoundException ignored) {
46        }
47
48        Class<?> clazz = mClasses.get(name);
49        if (clazz == null) {
50            String path = name.replace('.', '/').concat(".class");
51            try {
52                byte[] b = Streams.readFully(getResourceAsStream(myModuleRoot + path));
53                clazz = defineClass(name, b, 0, b.length);
54                mClasses.put(name, clazz);
55            } catch (IOException ignore) {
56                throw new ClassNotFoundException(name + " not found");
57            }
58        }
59
60        return clazz;
61    }
62}
63