gt:         if (mClosed) {
context: /*
   * 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.ims.internal;
  
  import android.os.Message;
  import android.os.RemoteException;
  import android.telecom.Connection;
  
  import java.util.Objects;
  import android.util.Log;
  import com.android.ims.ImsCallProfile;
  import com.android.ims.ImsConferenceState;
  import com.android.ims.ImsReasonInfo;
  import com.android.ims.ImsStreamMediaProfile;
  
  /**
   * Provides the call initiation/termination, and media exchange between two IMS endpoints.
   * It directly communicates with IMS service which implements the IMS protocol behavior.
   *
   * @hide
   */
  public class ImsCallSession {
      private static final String TAG = "ImsCallSession";
  
      /**
       * Defines IMS call session state.
       */
      public static class State {
          public static final int IDLE = 0;
          public static final int INITIATED = 1;
          public static final int NEGOTIATING = 2;
          public static final int ESTABLISHING = 3;
          public static final int ESTABLISHED = 4;
  
          public static final int RENEGOTIATING = 5;
          public static final int REESTABLISHING = 6;
  
          public static final int TERMINATING = 7;
          public static final int TERMINATED = 8;
  
          public static final int INVALID = (-1);
  
          /**
           * Converts the state to string.
           */
          public static String toString(int state) {
              switch (state) {
                  case IDLE:
                      return "IDLE";
                  case INITIATED:
                      return "INITIATED";
                  case NEGOTIATING:
                      return "NEGOTIATING";
                  case ESTABLISHING:
                      return "ESTABLISHING";
                  case ESTABLISHED:
                      return "ESTABLISHED";
                  case RENEGOTIATING:
                      return "RENEGOTIATING";
                  case REESTABLISHING:
                      return "REESTABLISHING";
                  case TERMINATING:
                      return "TERMINATING";
                  case TERMINATED:
                      return "TERMINATED";
                  default:
                      return "UNKNOWN";
              }
          }
  
          private State() {
          }
      }
  
      /**
       * Listener for events relating to an IMS session, such as when a session is being
       * recieved ("on ringing") or a call is outgoing ("on calling").
       * <p>Many of these events are also received by {@link ImsCall.Listener}.</p>
       */
      public static class Listener {
          /**
           * Called when a request is sent out to initiate a new session
           * and 1xx response is received from the network.
           *
           * @param session the session object that carries out the IMS session
           */
          public void callSessionProgressing(ImsCallSession session,
                  ImsStreamMediaProfile profile) {
              // no-op
          }
  
          /**
           * Called when the session is established.
           *
           * @param session the session object that carries out the IMS session
           */
          public void callSessionStarted(ImsCallSession session,
                  ImsCallProfile profile) {
              // no-op
          }
  
          /**
           * Called when the session establishment is failed.
           *
           * @param session the session object that carries out the IMS session
           * @param reasonInfo detailed reason of the session establishment failure
           */
          public void callSessionStartFailed(ImsCallSession session,
                  ImsReasonInfo reasonInfo) {
          }
  
          /**
           * Called when the session is terminated.
           *
           * @param session the session object that carries out the IMS session
           * @param reasonInfo detailed reason of the session termination
           */
          public void callSessionTerminated(ImsCallSession session,
                  ImsReasonInfo reasonInfo) {
          }
  
          /**
           * Called when the session is in hold.
           *
           * @param session the session object that carries out the IMS session
           */
          public void callSessionHeld(ImsCallSession session,
                  ImsCallProfile profile) {
          }
  
          /**
           * Called when the session hold is failed.
           *
           * @param session the session object that carries out the IMS session
           * @param reasonInfo detailed reason of the session hold failure
           */
          public void callSessionHoldFailed(ImsCallSession session,
                  ImsReasonInfo reasonInfo) {
          }
  
          /**
           * Called when the session hold is received from the remote user.
           *
           * @param session the session object that carries out the IMS session
           */
          public void callSessionHoldReceived(ImsCallSession session,
                  ImsCallProfile profile) {
          }
  
          /**
           * Called when the session resume is done.
           *
           * @param session the session object that carries out the IMS session
           */
          public void callSessionResumed(ImsCallSession session,
                  ImsCallProfile profile) {
          }
  
          /**
           * Called when the session resume is failed.
           *
           * @param session the session object that carries out the IMS session
           * @param reasonInfo detailed reason of the session resume failure
           */
          public void callSessionResumeFailed(ImsCallSession session,
                  ImsReasonInfo reasonInfo) {
          }
  
          /**
           * Called when the session resume is received from the remote user.
           *
           * @param session the session object that carries out the IMS session
           */
          public void callSessionResumeReceived(ImsCallSession session,
                  ImsCallProfile profile) {
          }
  
          /**
           * Called when the session merge has been started.  At this point, the {@code newSession}
           * represents the session which has been initiated to the IMS conference server for the
           * new merged conference.
           *
           * @param session the session object that carries out the IMS session
           * @param newSession the session object that is merged with an active & hold session
           */
          public void callSessionMergeStarted(ImsCallSession session,
                  ImsCallSession newSession, ImsCallProfile profile) {
          }
  
          /**
           * Called when the session merge is successful and the merged session is active.
           *
           * @param session the session object that carries out the IMS session
           */
          public void callSessionMergeComplete(ImsCallSession session) {
          }
  
          /**
           * Called when the session merge has failed.
           *
           * @param session the session object that carries out the IMS session
           * @param reasonInfo detailed reason of the call merge failure
           */
          public void callSessionMergeFailed(ImsCallSession session,
                  ImsReasonInfo reasonInfo) {
          }
  
          /**
           * Called when the session is updated (except for hold/unhold).
           *
           * @param call the call object that carries out the IMS call
           */
          public void callSessionUpdated(ImsCallSession session,
                  ImsCallProfile profile) {
          }
  
          /**
           * Called when the session update is failed.
           *
           * @param session the session object that carries out the IMS session
           * @param reasonInfo detailed reason of the session update failure
           */
          public void callSessionUpdateFailed(ImsCallSession session,
                  ImsReasonInfo reasonInfo) {
          }
  
          /**
           * Called when the session update is received from the remote user.
           *
           * @param session the session object that carries out the IMS session
           */
          public void callSessionUpdateReceived(ImsCallSession session,
                  ImsCallProfile profile) {
              // no-op
          }
  
          /**
           * Called when the session is extended to the conference session.
           *
           * @param session the session object that carries out the IMS session
           * @param newSession the session object that is extended to the conference
           *      from the active session
           */
          public void callSessionConferenceExtended(ImsCallSession session,
                  ImsCallSession newSession, ImsCallProfile profile) {
          }
  
          /**
           * Called when the conference extension is failed.
           *
           * @param session the session object that carries out the IMS session
           * @param reasonInfo detailed reason of the conference extension failure
           */
          public void callSessionConferenceExtendFailed(ImsCallSession session,
                  ImsReasonInfo reasonInfo) {
          }
  
          /**
           * Called when the conference extension is received from the remote user.
           *
           * @param session the session object that carries out the IMS session
           */
          public void callSessionConferenceExtendReceived(ImsCallSession session,
                  ImsCallSession newSession, ImsCallProfile profile) {
              // no-op
          }
  
          /**
           * Called when the invitation request of the participants is delivered to the conference
           * server.
           *
           * @param session the session object that carries out the IMS session
           */
          public void callSessionInviteParticipantsRequestDelivered(ImsCallSession session) {
              // no-op
          }
  
          /**
           * Called when the invitation request of the participants is failed.
           *
           * @param session the session object that carries out the IMS session
           * @param reasonInfo detailed reason of the conference invitation failure
           */
          public void callSessionInviteParticipantsRequestFailed(ImsCallSession session,
                  ImsReasonInfo reasonInfo) {
              // no-op
          }
  
          /**
           * Called when the removal request of the participants is delivered to the conference
           * server.
           *
           * @param session the session object that carries out the IMS session
           */
          public void callSessionRemoveParticipantsRequestDelivered(ImsCallSession session) {
              // no-op
          }
  
          /**
           * Called when the removal request of the participants is failed.
           *
           * @param session the session object that carries out the IMS session
           * @param reasonInfo detailed reason of the conference removal failure
           */
          public void callSessionRemoveParticipantsRequestFailed(ImsCallSession session,
                  ImsReasonInfo reasonInfo) {
              // no-op
          }
  
          /**
           * Called when the conference state is updated.
           *
           * @param session the session object that carries out the IMS session
           */
          public void callSessionConferenceStateUpdated(ImsCallSession session,
                  ImsConferenceState state) {
              // no-op
          }
  
          /**
           * Called when the USSD message is received from the network.
           *
           * @param mode mode of the USSD message (REQUEST / NOTIFY)
           * @param ussdMessage USSD message
           */
          public void callSessionUssdMessageReceived(ImsCallSession session,
                  int mode, String ussdMessage) {
              // no-op
          }
  
          /**
           * Called when session access technology changes
           *
           * @param session IMS session object
           * @param srcAccessTech original access technology
           * @param targetAccessTech new access technology
           * @param reasonInfo
           */
          public void callSessionHandover(ImsCallSession session,
                                   int srcAccessTech, int targetAccessTech,
                                   ImsReasonInfo reasonInfo) {
              // no-op
          }
  
          /**
           * Called when session access technology change fails
           *
           * @param session IMS session object
           * @param srcAccessTech original access technology
           * @param targetAccessTech new access technology
           * @param reasonInfo handover failure reason
           */
          public void callSessionHandoverFailed(ImsCallSession session,
                                         int srcAccessTech, int targetAccessTech,
                                         ImsReasonInfo reasonInfo) {
              // no-op
          }
  
          /**
           * Called when TTY mode of remote party changed
           *
           * @param session IMS session object
           * @param mode TTY mode of remote party
           */
          public void callSessionTtyModeReceived(ImsCallSession session,
                                         int mode) {
              // no-op
          }
  
          /**
           * Notifies of a change to the multiparty state for this {@code ImsCallSession}.
           *
           * @param session The call session.
           * @param isMultiParty {@code true} if the session became multiparty, {@code false}
           *      otherwise.
           */
          public void callSessionMultipartyStateChanged(ImsCallSession session,
                  boolean isMultiParty) {
              // no-op
          }
      }
  
      private final IImsCallSession miSession;
      private boolean mClosed = false;
      private Listener mListener;
  
      public ImsCallSession(IImsCallSession iSession) {
          miSession = iSession;
  
          if (iSession != null) {
              try {
                  iSession.setListener(new IImsCallSessionListenerProxy());
              } catch (RemoteException e) {
              }
          } else {
              mClosed = true;
          }
      }
  
      public ImsCallSession(IImsCallSession iSession, Listener listener) {
          this(iSession);
          setListener(listener);
      }
  
      /**
       * Closes this object. This object is not usable after being closed.
       */
      public synchronized void close() {
          if (mClosed) {
              return;
          }
  
          try {
              miSession.close();
              mClosed = true;
          } catch (RemoteException e) {
          }
      }
  
      /**
       * Gets the call ID of the session.
       *
       * @return the call ID
       */
      public String getCallId() {
          if (mClosed) {
              return null;
          }
  
          try {
              return miSession.getCallId();
          } catch (RemoteException e) {
              return null;
          }
      }
  
      /**
       * Gets the call profile that this session is associated with
       *
       * @return the call profile that this session is associated with
       */
      public ImsCallProfile getCallProfile() {
          if (mClosed) {
              return null;
          }
  
          try {
              return miSession.getCallProfile();
          } catch (RemoteException e) {
              return null;
          }
      }
  
      /**
       * Gets the local call profile that this session is associated with
       *
       * @return the local call profile that this session is associated with
       */
      public ImsCallProfile getLocalCallProfile() {
          if (mClosed) {
              return null;
          }
  
          try {
              return miSession.getLocalCallProfile();
          } catch (RemoteException e) {
              return null;
          }
      }
  
      /**
       * Gets the remote call profile that this session is associated with
       *
       * @return the remote call profile that this session is associated with
       */
      public ImsCallProfile getRemoteCallProfile() {
          if (mClosed) {
              return null;
          }
  
          try {
              return miSession.getRemoteCallProfile();
          } catch (RemoteException e) {
              return null;
          }
      }
  
      /**
       * Gets the video call provider for the session.
       *
       * @return The video call provider.
       */
      public IImsVideoCallProvider getVideoCallProvider() {
          if (mClosed) {
              return null;
          }
  
          try {
              return miSession.getVideoCallProvider();
          } catch (RemoteException e) {
              return null;
          }
      }
  
      /**
       * Gets the value associated with the specified property of this session.
       *
       * @return the string value associated with the specified property
       */
      public String getProperty(String name) {
          if (mClosed) {
              return null;
          }
  
          try {
              return miSession.getProperty(name);
          } catch (RemoteException e) {
              return null;
          }
      }
  
      /**
       * Gets the session state.
       * The value returned must be one of the states in {@link State}.
       *
       * @return the session state
       */
      public int getState() {
          if (mClosed) {
              return State.INVALID;
          }
  
          try {
              return miSession.getState();
          } catch (RemoteException e) {
              return State.INVALID;
          }
      }
  
      /**
       * Determines if the {@link ImsCallSession} is currently alive (e.g. not in a terminated or
       * closed state).
       *
       * @return {@code True} if the session is alive.
       */
      public boolean isAlive() {
          if (mClosed) {
              return false;
          }
  
          int state = getState();
          switch (state) {
              case State.IDLE:
              case State.INITIATED:
              case State.NEGOTIATING:
              case State.ESTABLISHING:
              case State.ESTABLISHED:
              case State.RENEGOTIATING:
              case State.REESTABLISHING:
                  return true;
              default:
                  return false;
          }
      }
  
      /**
       * Gets the native IMS call session.
       * @hide
       */
      public IImsCallSession getSession() {
          return miSession;
      }
  
      /**
       * Checks if the session is in call.
       *
       * @return true if the session is in call
       */
      public boolean isInCall() {
          if (mClosed) {
              return false;
          }
  
          try {
              return miSession.isInCall();
          } catch (RemoteException e) {
              return false;
          }
      }
  
      /**
       * Sets the listener to listen to the session events. A {@link ImsCallSession}
       * can only hold one listener at a time. Subsequent calls to this method
       * override the previous listener.
       *
       * @param listener to listen to the session events of this object
       */
      public void setListener(Listener listener) {
          mListener = listener;
      }
  
      /**
       * Mutes or unmutes the mic for the active call.
       *
       * @param muted true if the call is muted, false otherwise
       */
      public void setMute(boolean muted) {
          if (mClosed) {
              return;
          }
  
          try {
              miSession.setMute(muted);
          } catch (RemoteException e) {
          }
      }
  
      /**
       * Initiates an IMS call with the specified target and call profile.
       * The session listener is called back upon defined session events.
       * The method is only valid to call when the session state is in
       * {@link ImsCallSession#State#IDLE}.
       *
       * @param callee dialed string to make the call to
       * @param profile call profile to make the call with the specified service type,
       *      call type and media information
       * @see Listener#callSessionStarted, Listener#callSessionStartFailed
       */
      public void start(String callee, ImsCallProfile profile) {
          if (mClosed) {
              return;
          }
  
          try {
              miSession.start(callee, profile);
          } catch (RemoteException e) {
          }
      }
  
      /**
       * Initiates an IMS conference call with the specified target and call profile.
       * The session listener is called back upon defined session events.
       * The method is only valid to call when the session state is in
       * {@link ImsCallSession#State#IDLE}.
       *
       * @param participants participant list to initiate an IMS conference call
       * @param profile call profile to make the call with the specified service type,
       *      call type and media information
       * @see Listener#callSessionStarted, Listener#callSessionStartFailed
       */
      public void start(String[] participants, ImsCallProfile profile) {
          if (mClosed) {
              return;
          }
  
          try {
              miSession.startConference(participants, profile);
          } catch (RemoteException e) {
          }
      }
  
      /**
       * Accepts an incoming call or session update.
       *
       * @param callType call type specified in {@link ImsCallProfile} to be answered
       * @param profile stream media profile {@link ImsStreamMediaProfile} to be answered
       * @see Listener#callSessionStarted
       */
      public void accept(int callType, ImsStreamMediaProfile profile) {
          if (mClosed) {
              return;
          }
  
          try {
              miSession.accept(callType, profile);
          } catch (RemoteException e) {
          }
      }
  
      /**
       * Rejects an incoming call or session update.
       *
       * @param reason reason code to reject an incoming call
       * @see Listener#callSessionStartFailed
       */
      public void reject(int reason) {
          if (mClosed) {
              return;
          }
  
          try {
              miSession.reject(reason);
          } catch (RemoteException e) {
          }
      }
  
      /**
       * Terminates a call.
       *
       * @see Listener#callSessionTerminated
       */
      public void terminate(int reason) {
          if (mClosed) {
              return;
          }
  
          try {
              miSession.terminate(reason);
          } catch (RemoteException e) {
          }
      }
  
      /**
       * Puts a call on hold. When it succeeds, {@link Listener#callSessionHeld} is called.
       *
       * @param profile stream media profile {@link ImsStreamMediaProfile} to hold the call
       * @see Listener#callSessionHeld, Listener#callSessionHoldFailed
       */
      public void hold(ImsStreamMediaProfile profile) {
          if (mClosed) {
              return;
          }
  
          try {
              miSession.hold(profile);
          } catch (RemoteException e) {
          }
      }
  
      /**
       * Continues a call that's on hold. When it succeeds,
       * {@link Listener#callSessionResumed} is called.
       *
       * @param profile stream media profile {@link ImsStreamMediaProfile} to resume the call
       * @see Listener#callSessionResumed, Listener#callSessionResumeFailed
       */
      public void resume(ImsStreamMediaProfile profile) {
          if (mClosed) {
              return;
          }
  
          try {
              miSession.resume(profile);
          } catch (RemoteException e) {
          }
      }
  
      /**
       * Merges the active & hold call. When it succeeds,
       * {@link Listener#callSessionMergeStarted} is called.
       *
       * @see Listener#callSessionMergeStarted , Listener#callSessionMergeFailed
       */
      public void merge() {
          if (mClosed) {
              return;
          }
  
          try {
              miSession.merge();
          } catch (RemoteException e) {
          }
      }
  
      /**
       * Updates the current call's properties (ex. call mode change: video upgrade / downgrade).
       *
       * @param callType call type specified in {@link ImsCallProfile} to be updated
       * @param profile stream media profile {@link ImsStreamMediaProfile} to be updated
       * @see Listener#callSessionUpdated, Listener#callSessionUpdateFailed
       */
      public void update(int callType, ImsStreamMediaProfile profile) {
          if (mClosed) {
              return;
          }
  
          try {
              miSession.update(callType, profile);
          } catch (RemoteException e) {
          }
      }
  
      /**
       * Extends this call to the conference call with the specified recipients.
       *
       * @participants participant list to be invited to the conference call after extending the call
       * @see Listener#sessionConferenceExtened, Listener#sessionConferenceExtendFailed
       */
      public void extendToConference(String[] participants) {
  