content: /*
   * Copyright (C) 2013 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.policy.keyguard;
  
  import android.app.ActivityManager;
  import android.content.Context;
  import android.os.RemoteException;
  import android.util.Slog;
  
  import com.android.internal.policy.IKeyguardService;
  import com.android.internal.policy.IKeyguardStateCallback;
  import com.android.internal.widget.LockPatternUtils;
  
  import java.io.PrintWriter;
  
  /**
   * Maintains a cached copy of Keyguard's state.
   * @hide
   */
  public class KeyguardStateMonitor extends IKeyguardStateCallback.Stub {
      private static final String TAG = "KeyguardStateMonitor";
  
      // These cache the current state of Keyguard to improve performance and avoid deadlock. After
      // Keyguard changes its state, it always triggers a layout in window manager. Because
      // IKeyguardStateCallback is synchronous and because these states are declared volatile, it's
      // guaranteed that window manager picks up the new state all the time in the layout caused by
      // the state change of Keyguard. To be extra safe, assume most restrictive values until Keyguard
      // tells us the actual value.
      private volatile boolean mIsShowing = true;
      private volatile boolean mSimSecure = true;
      private volatile boolean mInputRestricted = true;
      private volatile boolean mTrusted = false;
      private volatile boolean mHasLockscreenWallpaper = false;
  
      private int mCurrentUserId;
  
      private final LockPatternUtils mLockPatternUtils;
      private final StateCallback mCallback;
  
      public KeyguardStateMonitor(Context context, IKeyguardService service, StateCallback callback) {
          mLockPatternUtils = new LockPatternUtils(context);
          mCurrentUserId = ActivityManager.getCurrentUser();
          mCallback = callback;
  
          try {
              service.addStateMonitorCallback(this);
          } catch (RemoteException e) {
              Slog.w(TAG, "Remote Exception", e);
          }
      }
  
      public boolean isShowing() {
          return mIsShowing;
      }
  
      public boolean isSecure(int userId) {
          return mLockPatternUtils.isSecure(userId) || mSimSecure;
      }
  
      public boolean isInputRestricted() {
          return mInputRestricted;
      }
  
      public boolean isTrusted() {
          return mTrusted;
      }
  
      public boolean hasLockscreenWallpaper() {
          return mHasLockscreenWallpaper;
      }
  
      @Override // Binder interface
      public void onShowingStateChanged(boolean showing) {
          mIsShowing = showing;
  
          mCallback.onShowingChanged();
      }
  
      @Override // Binder interface
      public void onSimSecureStateChanged(boolean simSecure) {
          mSimSecure = simSecure;
      }
  
      public synchronized void setCurrentUser(int userId) {
          mCurrentUserId = userId;
      }
  
      @Override // Binder interface
      public void onInputRestrictedStateChanged(boolean inputRestricted) {
          mInputRestricted = inputRestricted;
      }
  
      @Override // Binder interface
      public void onTrustedChanged(boolean trusted) {
          mTrusted = trusted;
          mCallback.onTrustedChanged();
      }
  
      @Override // Binder interface
      public void onHasLockscreenWallpaperChanged(boolean hasLockscreenWallpaper) {
          mHasLockscreenWallpaper = hasLockscreenWallpaper;
      }
  
      public interface StateCallback {
          void onTrustedChanged();
          void onShowingChanged();
      }
  
      public void dump(String prefix, PrintWriter pw) {
          pw.println(prefix + TAG);
          prefix += "  ";
          pw.println(prefix + "mIsShowing=" + mIsShowing);
          pw.println(prefix + "mSimSecure=" + mSimSecure);
          pw.println(prefix + "mInputRestricted=" + mInputRestricted);
          pw.println(prefix + "mTrusted=" + mTrusted);
          pw.println(prefix + "mCurrentUserId=" + mCurrentUserId);
      }
  }
  