1/*
2 * Copyright (C) 2006 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 android.os;
18
19
20/**
21 * Native implementation of the service manager.  Most clients will only
22 * care about getDefault() and possibly asInterface().
23 * @hide
24 */
25public abstract class ServiceManagerNative extends Binder implements IServiceManager
26{
27    /**
28     * Cast a Binder object into a service manager interface, generating
29     * a proxy if needed.
30     */
31    static public IServiceManager asInterface(IBinder obj)
32    {
33        if (obj == null) {
34            return null;
35        }
36        IServiceManager in =
37            (IServiceManager)obj.queryLocalInterface(descriptor);
38        if (in != null) {
39            return in;
40        }
41
42        return new ServiceManagerProxy(obj);
43    }
44
45    public ServiceManagerNative()
46    {
47        attachInterface(this, descriptor);
48    }
49
50    public boolean onTransact(int code, Parcel data, Parcel reply, int flags)
51    {
52        try {
53            switch (code) {
54            case IServiceManager.GET_SERVICE_TRANSACTION: {
55                data.enforceInterface(IServiceManager.descriptor);
56                String name = data.readString();
57                IBinder service = getService(name);
58                reply.writeStrongBinder(service);
59                return true;
60            }
61
62            case IServiceManager.CHECK_SERVICE_TRANSACTION: {
63                data.enforceInterface(IServiceManager.descriptor);
64                String name = data.readString();
65                IBinder service = checkService(name);
66                reply.writeStrongBinder(service);
67                return true;
68            }
69
70            case IServiceManager.ADD_SERVICE_TRANSACTION: {
71                data.enforceInterface(IServiceManager.descriptor);
72                String name = data.readString();
73                IBinder service = data.readStrongBinder();
74                addService(name, service);
75                return true;
76            }
77
78            case IServiceManager.LIST_SERVICES_TRANSACTION: {
79                data.enforceInterface(IServiceManager.descriptor);
80                String[] list = listServices();
81                reply.writeStringArray(list);
82                return true;
83            }
84
85            case IServiceManager.SET_PERMISSION_CONTROLLER_TRANSACTION: {
86                data.enforceInterface(IServiceManager.descriptor);
87                IPermissionController controller
88                        = IPermissionController.Stub.asInterface(
89                                data.readStrongBinder());
90                setPermissionController(controller);
91                return true;
92            }
93            }
94        } catch (RemoteException e) {
95        }
96
97        return false;
98    }
99
100    public IBinder asBinder()
101    {
102        return this;
103    }
104}
105
106class ServiceManagerProxy implements IServiceManager {
107    public ServiceManagerProxy(IBinder remote) {
108        mRemote = remote;
109    }
110
111    public IBinder asBinder() {
112        return mRemote;
113    }
114
115    public IBinder getService(String name) throws RemoteException {
116        Parcel data = Parcel.obtain();
117        Parcel reply = Parcel.obtain();
118        data.writeInterfaceToken(IServiceManager.descriptor);
119        data.writeString(name);
120        mRemote.transact(GET_SERVICE_TRANSACTION, data, reply, 0);
121        IBinder binder = reply.readStrongBinder();
122        reply.recycle();
123        data.recycle();
124        return binder;
125    }
126
127    public IBinder checkService(String name) throws RemoteException {
128        Parcel data = Parcel.obtain();
129        Parcel reply = Parcel.obtain();
130        data.writeInterfaceToken(IServiceManager.descriptor);
131        data.writeString(name);
132        mRemote.transact(CHECK_SERVICE_TRANSACTION, data, reply, 0);
133        IBinder binder = reply.readStrongBinder();
134        reply.recycle();
135        data.recycle();
136        return binder;
137    }
138
139    public void addService(String name, IBinder service)
140            throws RemoteException {
141        Parcel data = Parcel.obtain();
142        Parcel reply = Parcel.obtain();
143        data.writeInterfaceToken(IServiceManager.descriptor);
144        data.writeString(name);
145        data.writeStrongBinder(service);
146        mRemote.transact(ADD_SERVICE_TRANSACTION, data, reply, 0);
147        reply.recycle();
148        data.recycle();
149    }
150
151    public String[] listServices() throws RemoteException {
152        Parcel data = Parcel.obtain();
153        Parcel reply = Parcel.obtain();
154        data.writeInterfaceToken(IServiceManager.descriptor);
155        mRemote.transact(LIST_SERVICES_TRANSACTION, data, reply, 0);
156        String[] list = reply.readStringArray();
157        reply.recycle();
158        data.recycle();
159        return list;
160    }
161
162    public void setPermissionController(IPermissionController controller)
163            throws RemoteException {
164        Parcel data = Parcel.obtain();
165        Parcel reply = Parcel.obtain();
166        data.writeInterfaceToken(IServiceManager.descriptor);
167        data.writeStrongBinder(controller.asBinder());
168        mRemote.transact(SET_PERMISSION_CONTROLLER_TRANSACTION, data, reply, 0);
169        reply.recycle();
170        data.recycle();
171    }
172
173    private IBinder mRemote;
174}
175