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.server.wm;
18
19import android.os.IBinder;
20
21import java.util.HashMap;
22
23/**
24 * Class that allows the owner/creator of a {@link WindowContainer} to communicate directly with the
25 * container and make changes.
26 * Note that public calls (mostly in sub-classes) into this class are assumed to be originating from
27 * outside the window manager so the window manager lock is held and appropriate permissions are
28 * checked before calls are allowed to proceed.
29 *
30 * Test class: {@link WindowContainerControllerTests}
31 */
32class WindowContainerController<E extends WindowContainer, I extends WindowContainerListener> {
33
34    final WindowManagerService mService;
35    final RootWindowContainer mRoot;
36    final WindowHashMap mWindowMap;
37
38    // The window container this controller owns.
39    E mContainer;
40    // Interface for communicating changes back to the owner.
41    final I mListener;
42
43    WindowContainerController(I listener, WindowManagerService service) {
44        mListener = listener;
45        mService = service;
46        mRoot = mService != null ? mService.mRoot : null;
47        mWindowMap = mService != null ? mService.mWindowMap : null;
48    }
49
50    void setContainer(E container) {
51        if (mContainer != null && container != null) {
52            throw new IllegalArgumentException("Can't set container=" + container
53                    + " for controller=" + this + " Already set to=" + mContainer);
54        }
55        mContainer = container;
56    }
57
58    void removeContainer() {
59        // TODO: See if most uses cases should support removeIfPossible here.
60        //mContainer.removeIfPossible();
61        if (mContainer != null) {
62            mContainer.setController(null);
63            mContainer = null;
64        }
65    }
66
67    boolean checkCallingPermission(String permission, String func) {
68        return mService.checkCallingPermission(permission, func);
69    }
70}
71