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      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 
     17 package com.android.server.wm;
     18 
     19 import android.os.IBinder;
     20 
     21 import 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  */
     32 class 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