content: /*
   * Copyright (C) 2019 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.server.wm;
  
  import android.util.ArraySet;
  import android.util.SparseArray;
  
  import java.util.Map;
  import java.util.HashMap;
  
  final class WindowProcessControllerMap {
  
      /** All processes we currently have running mapped by pid */
      private final SparseArray<WindowProcessController> mPidMap = new SparseArray<>();
      /** All processes we currently have running mapped by uid */
      private final Map<Integer, ArraySet<WindowProcessController>> mUidMap = new HashMap<>();
  
      /** Retrieves a currently running process for pid. */
      WindowProcessController getProcess(int pid) {
          return mPidMap.get(pid);
      }
  
      /** Retrieves all currently running processes for uid. */
      ArraySet<WindowProcessController> getProcesses(int uid) {
          return mUidMap.get(uid);
      }
  
      SparseArray<WindowProcessController> getPidMap() {
          return mPidMap;
      }
  
      void put(int pid, WindowProcessController proc) {
          // if there is a process for this pid already in mPidMap it'll get replaced automagically,
          // but we actually need to remove it from mUidMap too before adding the new one
          final WindowProcessController prevProc = mPidMap.get(pid);
          if (prevProc != null) {
              removeProcessFromUidMap(prevProc);
          }
          // put process into mPidMap
          mPidMap.put(pid, proc);
          // put process into mUidMap
          final int uid = proc.mUid;
          ArraySet<WindowProcessController> procSet = mUidMap.getOrDefault(uid,
                  new ArraySet<WindowProcessController>());
          procSet.add(proc);
          mUidMap.put(uid, procSet);
      }
  
      void remove(int pid) {
          final WindowProcessController proc = mPidMap.get(pid);
          if (proc != null) {
              // remove process from mPidMap
              mPidMap.remove(pid);
              // remove process from mUidMap
              removeProcessFromUidMap(proc);
          }
      }
  
      private void removeProcessFromUidMap(WindowProcessController proc) {
          if (proc == null) {
              return;
          }
          final int uid = proc.mUid;
          ArraySet<WindowProcessController> procSet = mUidMap.get(uid);
          if (procSet != null) {
              procSet.remove(proc);
              if (procSet.isEmpty()) {
                  mUidMap.remove(uid);
              }
          }
      }
  }
  