telecomm/java/android/telecom/Conference.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2014 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 android.telecom;

 import android.annotation.SystemApi;

 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Set;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.CopyOnWriteArraySet;

 /**
  * Represents a conference call which can contain any number of {@link Connection} objects.
  * @hide
  */
 @SystemApi
 public abstract class Conference implements IConferenceable {

     /**
      * Used to indicate that the conference connection time is not specified.  If not specified,
      * Telecom will set the connect time.
      */
     public static long CONNECT_TIME_NOT_SPECIFIED = 0;

     /** @hide */
     public abstract static class Listener {
         public void onStateChanged(Conference conference, int oldState, int newState) {}
         public void onDisconnected(Conference conference, DisconnectCause disconnectCause) {}
         public void onConnectionAdded(Conference conference, Connection connection) {}
         public void onConnectionRemoved(Conference conference, Connection connection) {}
         public void onConferenceableConnectionsChanged(
                 Conference conference, List<Connection> conferenceableConnections) {}
         public void onDestroyed(Conference conference) {}
         public void onConnectionCapabilitiesChanged(
                 Conference conference, int connectionCapabilities) {}
     }

     private final Set<Listener> mListeners = new CopyOnWriteArraySet<>();
     private final List<Connection> mChildConnections = new CopyOnWriteArrayList<>();
     private final List<Connection> mUnmodifiableChildConnections =
             Collections.unmodifiableList(mChildConnections);
     private final List<Connection> mConferenceableConnections = new ArrayList<>();
     private final List<Connection> mUnmodifiableConferenceableConnections =
             Collections.unmodifiableList(mConferenceableConnections);

     protected PhoneAccountHandle mPhoneAccount;
     private AudioState mAudioState;
     private int mState = Connection.STATE_NEW;
     private DisconnectCause mDisconnectCause;
     private int mConnectionCapabilities;
     private String mDisconnectMessage;
     private long mConnectTimeMillis = CONNECT_TIME_NOT_SPECIFIED;

     private final Connection.Listener mConnectionDeathListener = new Connection.Listener() {
         @Override
         public void onDestroyed(Connection c) {
             if (mConferenceableConnections.remove(c)) {
                 fireOnConferenceableConnectionsChanged();
             }
         }
     };

     /**
      * Constructs a new Conference with a mandatory {@link PhoneAccountHandle}
      *
      * @param phoneAccount The {@code PhoneAccountHandle} associated with the conference.
      */
     public Conference(PhoneAccountHandle phoneAccount) {
         mPhoneAccount = phoneAccount;
     }

     /**
      * Returns the {@link PhoneAccountHandle} the conference call is being placed through.
      *
      * @return A {@code PhoneAccountHandle} object representing the PhoneAccount of the conference.
      */
     public final PhoneAccountHandle getPhoneAccountHandle() {
         return mPhoneAccount;
     }

     /**
      * Returns the list of connections currently associated with the conference call.
      *
      * @return A list of {@code Connection} objects which represent the children of the conference.
      */
     public final List<Connection> getConnections() {
         return mUnmodifiableChildConnections;
     }

     /**
      * Gets the state of the conference call. See {@link Connection} for valid values.
      *
      * @return A constant representing the state the conference call is currently in.
      */
     public final int getState() {
         return mState;
     }

     /** @hide */
     @Deprecated public final int getCapabilities() {
         return getConnectionCapabilities();
     }

     /**
      * Returns the capabilities of a conference. See {@code CAPABILITY_*} constants in class
      * {@link Connection} for valid values.
      *
      * @return A bitmask of the capabilities of the conference call.
      */
     public final int getConnectionCapabilities() {
         return mConnectionCapabilities;
     }

     /**
      * Whether the given capabilities support the specified capability.
      *
      * @param capabilities A capability bit field.
      * @param capability The capability to check capabilities for.
      * @return Whether the specified capability is supported.
      * @hide
      */
     public static boolean can(int capabilities, int capability) {
         return (capabilities & capability) != 0;
     }

     /**
      * Whether the capabilities of this {@code Connection} supports the specified capability.
      *
      * @param capability The capability to check capabilities for.
      * @return Whether the specified capability is supported.
      * @hide
      */
     public boolean can(int capability) {
         return can(mConnectionCapabilities, capability);
     }

     /**
      * Removes the specified capability from the set of capabilities of this {@code Conference}.
      *
      * @param capability The capability to remove from the set.
      * @hide
      */
     public void removeCapability(int capability) {
         mConnectionCapabilities &= ~capability;
     }

     /**
      * Adds the specified capability to the set of capabilities of this {@code Conference}.
      *
      * @param capability The capability to add to the set.
      * @hide
      */
     public void addCapability(int capability) {
         mConnectionCapabilities |= capability;
     }

     /**
      * @return The audio state of the conference, describing how its audio is currently
      *         being routed by the system. This is {@code null} if this Conference
      *         does not directly know about its audio state.
      */
     public final AudioState getAudioState() {
         return mAudioState;
     }

     /**
      * Invoked when the Conference and all it's {@link Connection}s should be disconnected.
      */
     public void onDisconnect() {}

     /**
      * Invoked when the specified {@link Connection} should be separated from the conference call.
      *
      * @param connection The connection to separate.
      */
     public void onSeparate(Connection connection) {}

     /**
      * Invoked when the specified {@link Connection} should merged with the conference call.
      *
      * @param connection The {@code Connection} to merge.
      */
     public void onMerge(Connection connection) {}

     /**
      * Invoked when the conference should be put on hold.
      */
     public void onHold() {}

     /**
      * Invoked when the conference should be moved from hold to active.
      */
     public void onUnhold() {}

     /**
      * Invoked when the child calls should be merged. Only invoked if the conference contains the
      * capability {@link Connection#CAPABILITY_MERGE_CONFERENCE}.
      */
     public void onMerge() {}

     /**
      * Invoked when the child calls should be swapped. Only invoked if the conference contains the
      * capability {@link Connection#CAPABILITY_SWAP_CONFERENCE}.
      */
     public void onSwap() {}

     /**
      * Notifies this conference of a request to play a DTMF tone.
      *
      * @param c A DTMF character.
      */
     public void onPlayDtmfTone(char c) {}

     /**
      * Notifies this conference of a request to stop any currently playing DTMF tones.
      */
     public void onStopDtmfTone() {}

     /**
      * Notifies this conference that the {@link #getAudioState()} property has a new value.
      *
      * @param state The new call audio state.
      */
     public void onAudioStateChanged(AudioState state) {}

     /**
      * Notifies this conference that a connection has been added to it.
      *
      * @param connection The newly added connection.
      */
     public void onConnectionAdded(Connection connection) {}

     /**
      * Sets state to be on hold.
      */
     public final void setOnHold() {
         setState(Connection.STATE_HOLDING);
     }

     /**
      * Sets state to be active.
      */
     public final void setActive() {
         setState(Connection.STATE_ACTIVE);
     }

     /**
      * Sets state to disconnected.
      *
      * @param disconnectCause The reason for the disconnection, as described by
      *     {@link android.telecom.DisconnectCause}.
      */
     public final void setDisconnected(DisconnectCause disconnectCause) {
         mDisconnectCause = disconnectCause;;
         setState(Connection.STATE_DISCONNECTED);
         for (Listener l : mListeners) {
             l.onDisconnected(this, mDisconnectCause);
         }
     }

     /**
      * @return The {@link DisconnectCause} for this connection.
      */
     public final DisconnectCause getDisconnectCause() {
         return mDisconnectCause;
     }

     /** @hide */
     @Deprecated public final void setCapabilities(int connectionCapabilities) {
         setConnectionCapabilities(connectionCapabilities);
     }

     /**
      * Sets the capabilities of a conference. See {@code CAPABILITY_*} constants of class
      * {@link Connection} for valid values.
      *
      * @param connectionCapabilities A bitmask of the {@code PhoneCapabilities} of the conference call.
      */
     public final void setConnectionCapabilities(int connectionCapabilities) {
         if (connectionCapabilities != mConnectionCapabilities) {
             mConnectionCapabilities = connectionCapabilities;

             for (Listener l : mListeners) {
                 l.onConnectionCapabilitiesChanged(this, mConnectionCapabilities);
             }
         }
     }

     /**
      * Adds the specified connection as a child of this conference.
      *
      * @param connection The connection to add.
      * @return True if the connection was successfully added.
      */
     public final boolean addConnection(Connection connection) {
         if (connection != null && !mChildConnections.contains(connection)) {
             if (connection.setConference(this)) {
                 mChildConnections.add(connection);
                 onConnectionAdded(connection);
                 for (Listener l : mListeners) {
                     l.onConnectionAdded(this, connection);
                 }
                 return true;
             }
         }
         return false;
     }

     /**
      * Removes the specified connection as a child of this conference.
      *
      * @param connection The connection to remove.
      */
     public final void removeConnection(Connection connection) {
         Log.d(this, "removing %s from %s", connection, mChildConnections);
         if (connection != null && mChildConnections.remove(connection)) {
             connection.resetConference();
             for (Listener l : mListeners) {
                 l.onConnectionRemoved(this, connection);
             }
         }
     }

     /**
      * Sets the connections with which this connection can be conferenced.
      *
      * @param conferenceableConnections The set of connections this connection can conference with.
      */
     public final void setConferenceableConnections(List<Connection> conferenceableConnections) {
         clearConferenceableList();
         for (Connection c : conferenceableConnections) {
             // If statement checks for duplicates in input. It makes it N^2 but we're dealing with a
             // small amount of items here.
             if (!mConferenceableConnections.contains(c)) {
                 c.addConnectionListener(mConnectionDeathListener);
                 mConferenceableConnections.add(c);
             }
         }
         fireOnConferenceableConnectionsChanged();
     }

     private final void fireOnConferenceableConnectionsChanged() {
         for (Listener l : mListeners) {
             l.onConferenceableConnectionsChanged(this, getConferenceableConnections());
         }
     }

     /**
      * Returns the connections with which this connection can be conferenced.
      */
     public final List<Connection> getConferenceableConnections() {
         return mUnmodifiableConferenceableConnections;
     }

     /**
      * Tears down the conference object and any of its current connections.
      */
     public final void destroy() {
         Log.d(this, "destroying conference : %s", this);
         // Tear down the children.
         for (Connection connection : mChildConnections) {
             Log.d(this, "removing connection %s", connection);
             removeConnection(connection);
         }

         // If not yet disconnected, set the conference call as disconnected first.
         if (mState != Connection.STATE_DISCONNECTED) {
             Log.d(this, "setting to disconnected");
             setDisconnected(new DisconnectCause(DisconnectCause.LOCAL));
         }

         // ...and notify.
         for (Listener l : mListeners) {
             l.onDestroyed(this);
         }
     }

     /**
      * Add a listener to be notified of a state change.
      *
      * @param listener The new listener.
      * @return This conference.
      * @hide
      */
     public final Conference addListener(Listener listener) {
         mListeners.add(listener);
         return this;
     }

     /**
      * Removes the specified listener.
      *
      * @param listener The listener to remove.
      * @return This conference.
      * @hide
      */
     public final Conference removeListener(Listener listener) {
         mListeners.remove(listener);
         return this;
     }

     /**
      * Retrieves the primary connection associated with the conference.  The primary connection is
      * the connection from which the conference will retrieve its current state.
      *
      * @return The primary connection.
      */
     public Connection getPrimaryConnection() {
         if (mUnmodifiableChildConnections == null || mUnmodifiableChildConnections.isEmpty()) {
             return null;
         }
         return mUnmodifiableChildConnections.get(0);
     }

     /**
      * Sets the connect time of the {@code Conference}.
      *
      * @param connectTimeMillis The connection time, in milliseconds.
      */
     public void setConnectTimeMillis(long connectTimeMillis) {
         mConnectTimeMillis = connectTimeMillis;
     }

     /**
      * Retrieves the connect time of the {@code Conference}, if specified.  A value of
      * {@link #CONNECT_TIME_NOT_SPECIFIED} indicates that Telecom should determine the start time
      * of the conference.
      *
      * @return The time the {@code Conference} has been connected.
      */
     public long getConnectTimeMillis() {
         return mConnectTimeMillis;
     }

     /**
      * Inform this Conference that the state of its audio output has been changed externally.
      *
      * @param state The new audio state.
      * @hide
      */
     final void setAudioState(AudioState state) {
         Log.d(this, "setAudioState %s", state);
         mAudioState = state;
         onAudioStateChanged(state);
     }

     private void setState(int newState) {
         if (newState != Connection.STATE_ACTIVE &&
                 newState != Connection.STATE_HOLDING &&
                 newState != Connection.STATE_DISCONNECTED) {
             Log.w(this, "Unsupported state transition for Conference call.",
                     Connection.stateToString(newState));
             return;
         }

         if (mState != newState) {
             int oldState = mState;
             mState = newState;
             for (Listener l : mListeners) {
                 l.onStateChanged(this, oldState, newState);
             }
         }
     }

     private final void clearConferenceableList() {
         for (Connection c : mConferenceableConnections) {
             c.removeConnectionListener(mConnectionDeathListener);
         }
         mConferenceableConnections.clear();
     }
 }
	/*
	* Copyright (C) 2014 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 android.telecom;

	import android.annotation.SystemApi;

	import java.util.ArrayList;
	import java.util.Collections;
	import java.util.List;
	import java.util.Set;
	import java.util.concurrent.CopyOnWriteArrayList;
	import java.util.concurrent.CopyOnWriteArraySet;

	/**
	* Represents a conference call which can contain any number of {@link Connection} objects.
	* @hide
	*/
	@SystemApi
	public abstract class Conference implements IConferenceable {

	/**
	* Used to indicate that the conference connection time is not specified. If not specified,
	* Telecom will set the connect time.
	*/
	public static long CONNECT_TIME_NOT_SPECIFIED = 0;

	/** @hide */
	public abstract static class Listener {
	public void onStateChanged(Conference conference, int oldState, int newState) {}
	public void onDisconnected(Conference conference, DisconnectCause disconnectCause) {}
	public void onConnectionAdded(Conference conference, Connection connection) {}
	public void onConnectionRemoved(Conference conference, Connection connection) {}
	public void onConferenceableConnectionsChanged(
	Conference conference, List<Connection> conferenceableConnections) {}
	public void onDestroyed(Conference conference) {}
	public void onConnectionCapabilitiesChanged(
	Conference conference, int connectionCapabilities) {}
	}

	private final Set<Listener> mListeners = new CopyOnWriteArraySet<>();
	private final List<Connection> mChildConnections = new CopyOnWriteArrayList<>();
	private final List<Connection> mUnmodifiableChildConnections =
	Collections.unmodifiableList(mChildConnections);
	private final List<Connection> mConferenceableConnections = new ArrayList<>();
	private final List<Connection> mUnmodifiableConferenceableConnections =
	Collections.unmodifiableList(mConferenceableConnections);

	protected PhoneAccountHandle mPhoneAccount;
	private AudioState mAudioState;
	private int mState = Connection.STATE_NEW;
	private DisconnectCause mDisconnectCause;
	private int mConnectionCapabilities;
	private String mDisconnectMessage;
	private long mConnectTimeMillis = CONNECT_TIME_NOT_SPECIFIED;

	private final Connection.Listener mConnectionDeathListener = new Connection.Listener() {
	@Override
	public void onDestroyed(Connection c) {
	if (mConferenceableConnections.remove(c)) {
	fireOnConferenceableConnectionsChanged();
	}
	}
	};

	/**
	* Constructs a new Conference with a mandatory {@link PhoneAccountHandle}
	*
	* @param phoneAccount The {@code PhoneAccountHandle} associated with the conference.
	*/
	public Conference(PhoneAccountHandle phoneAccount) {
	mPhoneAccount = phoneAccount;
	}

	/**
	* Returns the {@link PhoneAccountHandle} the conference call is being placed through.
	*
	* @return A {@code PhoneAccountHandle} object representing the PhoneAccount of the conference.
	*/
	public final PhoneAccountHandle getPhoneAccountHandle() {
	return mPhoneAccount;
	}

	/**
	* Returns the list of connections currently associated with the conference call.
	*
	* @return A list of {@code Connection} objects which represent the children of the conference.
	*/
	public final List<Connection> getConnections() {
	return mUnmodifiableChildConnections;
	}

	/**
	* Gets the state of the conference call. See {@link Connection} for valid values.
	*
	* @return A constant representing the state the conference call is currently in.
	*/
	public final int getState() {
	return mState;
	}

	/** @hide */
	@Deprecated public final int getCapabilities() {
	return getConnectionCapabilities();
	}

	/**
	* Returns the capabilities of a conference. See {@code CAPABILITY_*} constants in class
	* {@link Connection} for valid values.
	*
	* @return A bitmask of the capabilities of the conference call.
	*/
	public final int getConnectionCapabilities() {
	return mConnectionCapabilities;
	}

	/**
	* Whether the given capabilities support the specified capability.
	*
	* @param capabilities A capability bit field.
	* @param capability The capability to check capabilities for.
	* @return Whether the specified capability is supported.
	* @hide
	*/
	public static boolean can(int capabilities, int capability) {
	return (capabilities & capability) != 0;
	}

	/**
	* Whether the capabilities of this {@code Connection} supports the specified capability.
	*
	* @param capability The capability to check capabilities for.
	* @return Whether the specified capability is supported.
	* @hide
	*/
	public boolean can(int capability) {
	return can(mConnectionCapabilities, capability);
	}

	/**
	* Removes the specified capability from the set of capabilities of this {@code Conference}.
	*
	* @param capability The capability to remove from the set.
	* @hide
	*/
	public void removeCapability(int capability) {
	mConnectionCapabilities &= ~capability;
	}

	/**
	* Adds the specified capability to the set of capabilities of this {@code Conference}.
	*
	* @param capability The capability to add to the set.
	* @hide
	*/
	public void addCapability(int capability) {
	mConnectionCapabilities \|= capability;
	}

	/**
	* @return The audio state of the conference, describing how its audio is currently
	* being routed by the system. This is {@code null} if this Conference
	* does not directly know about its audio state.
	*/
	public final AudioState getAudioState() {
	return mAudioState;
	}

	/**
	* Invoked when the Conference and all it's {@link Connection}s should be disconnected.
	*/
	public void onDisconnect() {}

	/**
	* Invoked when the specified {@link Connection} should be separated from the conference call.
	*
	* @param connection The connection to separate.
	*/
	public void onSeparate(Connection connection) {}

	/**
	* Invoked when the specified {@link Connection} should merged with the conference call.
	*
	* @param connection The {@code Connection} to merge.
	*/
	public void onMerge(Connection connection) {}

	/**
	* Invoked when the conference should be put on hold.
	*/
	public void onHold() {}

	/**
	* Invoked when the conference should be moved from hold to active.
	*/
	public void onUnhold() {}

	/**
	* Invoked when the child calls should be merged. Only invoked if the conference contains the
	* capability {@link Connection#CAPABILITY_MERGE_CONFERENCE}.
	*/
	public void onMerge() {}

	/**
	* Invoked when the child calls should be swapped. Only invoked if the conference contains the
	* capability {@link Connection#CAPABILITY_SWAP_CONFERENCE}.
	*/
	public void onSwap() {}

	/**
	* Notifies this conference of a request to play a DTMF tone.
	*
	* @param c A DTMF character.
	*/
	public void onPlayDtmfTone(char c) {}

	/**
	* Notifies this conference of a request to stop any currently playing DTMF tones.
	*/
	public void onStopDtmfTone() {}

	/**
	* Notifies this conference that the {@link #getAudioState()} property has a new value.
	*
	* @param state The new call audio state.
	*/
	public void onAudioStateChanged(AudioState state) {}

	/**
	* Notifies this conference that a connection has been added to it.
	*
	* @param connection The newly added connection.
	*/
	public void onConnectionAdded(Connection connection) {}

	/**
	* Sets state to be on hold.
	*/
	public final void setOnHold() {
	setState(Connection.STATE_HOLDING);
	}

	/**
	* Sets state to be active.
	*/
	public final void setActive() {
	setState(Connection.STATE_ACTIVE);
	}

	/**
	* Sets state to disconnected.
	*
	* @param disconnectCause The reason for the disconnection, as described by
	* {@link android.telecom.DisconnectCause}.
	*/
	public final void setDisconnected(DisconnectCause disconnectCause) {
	mDisconnectCause = disconnectCause;;
	setState(Connection.STATE_DISCONNECTED);
	for (Listener l : mListeners) {
	l.onDisconnected(this, mDisconnectCause);
	}
	}

	/**
	* @return The {@link DisconnectCause} for this connection.
	*/
	public final DisconnectCause getDisconnectCause() {
	return mDisconnectCause;
	}

	/** @hide */
	@Deprecated public final void setCapabilities(int connectionCapabilities) {
	setConnectionCapabilities(connectionCapabilities);
	}

	/**
	* Sets the capabilities of a conference. See {@code CAPABILITY_*} constants of class
	* {@link Connection} for valid values.
	*
	* @param connectionCapabilities A bitmask of the {@code PhoneCapabilities} of the conference call.
	*/
	public final void setConnectionCapabilities(int connectionCapabilities) {
	if (connectionCapabilities != mConnectionCapabilities) {
	mConnectionCapabilities = connectionCapabilities;

	for (Listener l : mListeners) {
	l.onConnectionCapabilitiesChanged(this, mConnectionCapabilities);
	}
	}
	}

	/**
	* Adds the specified connection as a child of this conference.
	*
	* @param connection The connection to add.
	* @return True if the connection was successfully added.
	*/
	public final boolean addConnection(Connection connection) {
	if (connection != null && !mChildConnections.contains(connection)) {
	if (connection.setConference(this)) {
	mChildConnections.add(connection);
	onConnectionAdded(connection);
	for (Listener l : mListeners) {
	l.onConnectionAdded(this, connection);
	}
	return true;
	}
	}
	return false;
	}

	/**
	* Removes the specified connection as a child of this conference.
	*
	* @param connection The connection to remove.
	*/
	public final void removeConnection(Connection connection) {
	Log.d(this, "removing %s from %s", connection, mChildConnections);
	if (connection != null && mChildConnections.remove(connection)) {
	connection.resetConference();
	for (Listener l : mListeners) {
	l.onConnectionRemoved(this, connection);
	}
	}
	}

	/**
	* Sets the connections with which this connection can be conferenced.
	*
	* @param conferenceableConnections The set of connections this connection can conference with.
	*/
	public final void setConferenceableConnections(List<Connection> conferenceableConnections) {
	clearConferenceableList();
	for (Connection c : conferenceableConnections) {
	// If statement checks for duplicates in input. It makes it N^2 but we're dealing with a
	// small amount of items here.
	if (!mConferenceableConnections.contains(c)) {
	c.addConnectionListener(mConnectionDeathListener);
	mConferenceableConnections.add(c);
	}
	}
	fireOnConferenceableConnectionsChanged();
	}

	private final void fireOnConferenceableConnectionsChanged() {
	for (Listener l : mListeners) {
	l.onConferenceableConnectionsChanged(this, getConferenceableConnections());
	}
	}

	/**
	* Returns the connections with which this connection can be conferenced.
	*/
	public final List<Connection> getConferenceableConnections() {
	return mUnmodifiableConferenceableConnections;
	}

	/**
	* Tears down the conference object and any of its current connections.
	*/
	public final void destroy() {
	Log.d(this, "destroying conference : %s", this);
	// Tear down the children.
	for (Connection connection : mChildConnections) {
	Log.d(this, "removing connection %s", connection);
	removeConnection(connection);
	}

	// If not yet disconnected, set the conference call as disconnected first.
	if (mState != Connection.STATE_DISCONNECTED) {
	Log.d(this, "setting to disconnected");
	setDisconnected(new DisconnectCause(DisconnectCause.LOCAL));
	}

	// ...and notify.
	for (Listener l : mListeners) {
	l.onDestroyed(this);
	}
	}

	/**
	* Add a listener to be notified of a state change.
	*
	* @param listener The new listener.
	* @return This conference.
	* @hide
	*/
	public final Conference addListener(Listener listener) {
	mListeners.add(listener);
	return this;
	}

	/**
	* Removes the specified listener.
	*
	* @param listener The listener to remove.
	* @return This conference.
	* @hide
	*/
	public final Conference removeListener(Listener listener) {
	mListeners.remove(listener);
	return this;
	}

	/**
	* Retrieves the primary connection associated with the conference. The primary connection is
	* the connection from which the conference will retrieve its current state.
	*
	* @return The primary connection.
	*/
	public Connection getPrimaryConnection() {
	if (mUnmodifiableChildConnections == null \|\| mUnmodifiableChildConnections.isEmpty()) {
	return null;
	}
	return mUnmodifiableChildConnections.get(0);
	}

	/**
	* Sets the connect time of the {@code Conference}.
	*
	* @param connectTimeMillis The connection time, in milliseconds.
	*/
	public void setConnectTimeMillis(long connectTimeMillis) {
	mConnectTimeMillis = connectTimeMillis;
	}

	/**
	* Retrieves the connect time of the {@code Conference}, if specified. A value of
	* {@link #CONNECT_TIME_NOT_SPECIFIED} indicates that Telecom should determine the start time
	* of the conference.
	*
	* @return The time the {@code Conference} has been connected.
	*/
	public long getConnectTimeMillis() {
	return mConnectTimeMillis;
	}

	/**
	* Inform this Conference that the state of its audio output has been changed externally.
	*
	* @param state The new audio state.
	* @hide
	*/
	final void setAudioState(AudioState state) {
	Log.d(this, "setAudioState %s", state);
	mAudioState = state;
	onAudioStateChanged(state);
	}

	private void setState(int newState) {
	if (newState != Connection.STATE_ACTIVE &&
	newState != Connection.STATE_HOLDING &&
	newState != Connection.STATE_DISCONNECTED) {
	Log.w(this, "Unsupported state transition for Conference call.",
	Connection.stateToString(newState));
	return;
	}

	if (mState != newState) {
	int oldState = mState;
	mState = newState;
	for (Listener l : mListeners) {
	l.onStateChanged(this, oldState, newState);
	}
	}
	}

	private final void clearConferenceableList() {
	for (Connection c : mConferenceableConnections) {
	c.removeConnectionListener(mConnectionDeathListener);
	}
	mConferenceableConnections.clear();
	}
	}