content: /*
   * Copyright (C) 2011 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.provider;
  
  import android.annotation.SdkConstant;
  import android.annotation.SdkConstant.SdkConstantType;
  import android.annotation.TestApi;
  import android.content.ComponentName;
  import android.content.ContentResolver;
  import android.content.ContentValues;
  import android.content.Context;
  import android.content.Intent;
  import android.database.ContentObserver;
  import android.net.Uri;
  import android.provider.CallLog.Calls;
  import android.telecom.PhoneAccount;
  import android.telecom.PhoneAccountHandle;
  import android.telecom.Voicemail;
  
  import java.util.List;
  
  /**
   * The contract between the voicemail provider and applications. Contains
   * definitions for the supported URIs and columns.
   *
   * <P>The content providers exposes two tables through this interface:
   * <ul>
   *   <li> Voicemails table: This stores the actual voicemail records. The
   *   columns and URIs for accessing this table are defined by the
   *   {@link Voicemails} class.
   *   </li>
   *   <li> Status table: This provides a way for the voicemail source application
   *   to convey its current state to the system. The columns and URIS for
   *   accessing this table are defined by the {@link Status} class.
   *   </li>
   * </ul>
   *
   * <P> The minimum permission needed to access this content provider is
   * {@link android.Manifest.permission#ADD_VOICEMAIL} or carrier privileges (see
   * {@link android.telephony.TelephonyManager#hasCarrierPrivileges}).
   *
   * <P>Voicemails are inserted by what is called as a "voicemail source"
   * application, which is responsible for syncing voicemail data between a remote
   * server and the local voicemail content provider. "voicemail source"
   * application should always set the {@link #PARAM_KEY_SOURCE_PACKAGE} in the
   * URI to identify its package.
   *
   * <P>In addition to the {@link ContentObserver} notifications the voicemail
   * provider also generates broadcast intents to notify change for applications
   * that are not active and therefore cannot listen to ContentObserver
   * notifications. Broadcast intents with following actions are generated:
   * <ul>
   *   <li> {@link #ACTION_NEW_VOICEMAIL} is generated for each new voicemail
   *   inserted.
   *   </li>
   *   <li> {@link Intent#ACTION_PROVIDER_CHANGED} is generated for any change
   *    made into the database, including new voicemail.
   *   </li>
   * </ul>
   */
  public class VoicemailContract {
      /** Not instantiable. */
      private VoicemailContract() {
      }
  
      /** The authority used by the voicemail provider. */
      public static final String AUTHORITY = "com.android.voicemail";
      /**
       * Parameter key used in the URI to specify the voicemail source package name.
       * <p> This field must be set in all requests that originate from a voicemail source.
       */
      public static final String PARAM_KEY_SOURCE_PACKAGE = "source_package";
  
      /** Broadcast intent when a new voicemail record is inserted. */
      @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
      public static final String ACTION_NEW_VOICEMAIL = "android.intent.action.NEW_VOICEMAIL";
  
      /**
       * Broadcast intent to request a voicemail source to fetch voicemail content of a specific
       * voicemail from the remote server. The voicemail to fetch is specified by the data uri
       * of the intent.
       * <p>
       * All voicemail sources are expected to handle this event. After storing the content
       * the application should also set {@link Voicemails#HAS_CONTENT} to 1;
       */
      @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
      public static final String ACTION_FETCH_VOICEMAIL = "android.intent.action.FETCH_VOICEMAIL";
  
      /**
       * Broadcast intent to request all voicemail sources to perform a sync with the remote server.
       */
      @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
      public static final String ACTION_SYNC_VOICEMAIL = "android.provider.action.SYNC_VOICEMAIL";
  
      /**
       * Broadcast intent to inform a new visual voicemail SMS has been received. This intent will
       * only be delivered to the telephony service.
       *
       * @see #EXTRA_VOICEMAIL_SMS
       * @see #EXTRA_TARGET_PACKAGE
       *
       * @hide */
      @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
      public static final String ACTION_VOICEMAIL_SMS_RECEIVED =
              "com.android.internal.provider.action.VOICEMAIL_SMS_RECEIVED";
  
      /**
       * Extra in {@link #ACTION_VOICEMAIL_SMS_RECEIVED} indicating the content of the SMS.
       *
       * @hide
       */
      public static final String EXTRA_VOICEMAIL_SMS = "android.provider.extra.VOICEMAIL_SMS";
  
      /**
       * Extra in {@link #ACTION_VOICEMAIL_SMS_RECEIVED} indicating the target package to bind {@link
       * android.telephony.VisualVoicemailService}.
       *
       * <p>This extra should be set to android.telephony.VisualVoicemailSmsFilterSettings#packageName
       * while performing filtering. Since the default dialer might change between the filter sending
       * it and telephony binding to the service, this ensures the service will not receive SMS
       * filtered by the previous app.
       *
       * @hide
       */
      public static final String EXTRA_TARGET_PACKAGE = "android.provider.extra.TARGET_PACAKGE";
  
      /**
       * Extra included in {@link Intent#ACTION_PROVIDER_CHANGED} broadcast intents to indicate if the
       * receiving package made this change.
       */
      public static final String EXTRA_SELF_CHANGE = "com.android.voicemail.extra.SELF_CHANGE";
  
      /**
       * Extra included in {@link #ACTION_SYNC_VOICEMAIL} broadcast intents to indicate which {@link
       * PhoneAccountHandle} to sync.
       */
      public static final String EXTRA_PHONE_ACCOUNT_HANDLE =
              "android.provider.extra.PHONE_ACCOUNT_HANDLE";
  
      /**
       * Name of the source package field, which must be same across all voicemail related tables.
       * This is an internal field.
       * @hide
       */
      public static final String SOURCE_PACKAGE_FIELD = "source_package";
  
      /** Defines fields exposed through the /voicemail path of this content provider. */
      public static final class Voicemails implements BaseColumns, OpenableColumns {
          /** Not instantiable. */
          private Voicemails() {
          }
  
          /** URI to insert/retrieve voicemails. */
          public static final Uri CONTENT_URI =
              Uri.parse("content://" + AUTHORITY + "/voicemail");
  
          /** The MIME type for a collection of voicemails. */
          public static final String DIR_TYPE = "vnd.android.cursor.dir/voicemails";
  
          /** The MIME type for a single voicemail. */
          public static final String ITEM_TYPE = "vnd.android.cursor.item/voicemail";
  
          /**
           * Phone number of the voicemail sender.
           * <P>Type: TEXT</P>
           */
          public static final String NUMBER = Calls.NUMBER;
          /**
           * The date the voicemail was sent, in milliseconds since the epoch
           * <P>Type: INTEGER (long)</P>
           */
          public static final String DATE = Calls.DATE;
          /**
           * The duration of the voicemail in seconds.
           * <P>Type: INTEGER (long)</P>
           */
          public static final String DURATION = Calls.DURATION;
          /**
           * Whether or not the voicemail has been acknowledged (notification sent to the user).
           * <P>Type: INTEGER (boolean)</P>
           */
          public static final String NEW = Calls.NEW;
          /**
           * Whether this item has been read or otherwise consumed by the user.
           * <P>Type: INTEGER (boolean)</P>
           */
          public static final String IS_READ = Calls.IS_READ;
          /**
           * The mail box state of the voicemail. This field is currently not used by the system.
           * <P> Possible values: {@link #STATE_INBOX}, {@link #STATE_DELETED},
           * {@link #STATE_UNDELETED}.
           * <P>Type: INTEGER</P>
           * @hide
           */
          public static final String STATE = "state";
          /**
           * Value of {@link #STATE} when the voicemail is in inbox.
           * @hide
           */
          public static int STATE_INBOX = 0;
          /**
           * Value of {@link #STATE} when the voicemail has been marked as deleted.
           * @hide
           */
          public static int STATE_DELETED = 1;
          /**
           * Value of {@link #STATE} when the voicemail has marked as undeleted.
           * @hide
           */
          public static int STATE_UNDELETED = 2;
          /**
           * Package name of the source application that inserted the voicemail.
           * <P>Type: TEXT</P>
           */
          public static final String SOURCE_PACKAGE = SOURCE_PACKAGE_FIELD;
          /**
           * Application-specific data available to the source application that
           * inserted the voicemail. This is typically used to store the source
           * specific message id to identify this voicemail on the remote
           * voicemail server.
           * <P>Type: TEXT</P>
           * <P> Note that this is NOT the voicemail media content data.
           */
          public static final String SOURCE_DATA = "source_data";
          /**
           * Whether the media content for this voicemail is available for
           * consumption.
           * <P>Type: INTEGER (boolean)</P>
           */
          public static final String HAS_CONTENT = "has_content";
          /**
           * MIME type of the media content for the voicemail.
           * <P>Type: TEXT</P>
           */
          public static final String MIME_TYPE = "mime_type";
          /**
           * The transcription of the voicemail entry. This will only be populated if the voicemail
           * entry has a valid transcription.
           * <P>Type: TEXT</P>
           */
          public static final String TRANSCRIPTION = "transcription";
          /**
           * The state of the voicemail transcription.
           * <P> Possible values: {@link #TRANSCRIPTION_NOT_STARTED},
           * {@link #TRANSCRIPTION_IN_PROGRESS}, {@link #TRANSCRIPTION_FAILED},
           * {@link #TRANSCRIPTION_AVAILABLE}.
           * <P>Type: INTEGER</P>
           * @hide
           */
          public static final String TRANSCRIPTION_STATE = "transcription_state";
          /**
           * Value of {@link #TRANSCRIPTION_STATE} when the voicemail transcription has not yet
           * been attempted.
           * @hide
           */
          public static final int TRANSCRIPTION_NOT_STARTED = 0;
          /**
           * Value of {@link #TRANSCRIPTION_STATE} when the voicemail transcription has begun
           * but is not yet complete.
           * @hide
           */
          public static final int TRANSCRIPTION_IN_PROGRESS = 1;
          /**
           * Value of {@link #TRANSCRIPTION_STATE} when the voicemail transcription has
           * been attempted and failed.
           * @hide
           */
          public static final int TRANSCRIPTION_FAILED = 2;
          /**
           * Value of {@link #TRANSCRIPTION_STATE} when the voicemail transcription has
           * completed and the result has been stored in the {@link #TRANSCRIPTION} column.
           * @hide
           */
          public static final int TRANSCRIPTION_AVAILABLE = 3;
          /**
           * Path to the media content file. Internal only field.
           * @hide
           */
          @TestApi
          public static final String _DATA = "_data";
  
          // Note: PHONE_ACCOUNT_* constant values are "subscription_*" due to a historic naming
          // that was encoded into call log databases.
  
          /**
           * The {@link ComponentName} of the {@link PhoneAccount} in string form. The
           * {@link PhoneAccount} of the voicemail is used to differentiate voicemails from different
           * sources.
           * <P>Type: TEXT</P>
           */
          public static final String PHONE_ACCOUNT_COMPONENT_NAME = "subscription_component_name";
  
          /**
           * The identifier of a {@link PhoneAccount} that is unique to a specified
           * {@link ComponentName}. The {@link PhoneAccount} of the voicemail is used to differentiate
           * voicemails from different sources.
           * <P>Type: TEXT</P>
           */
          public static final String PHONE_ACCOUNT_ID = "subscription_id";
  
          /**
           * Flag used to indicate that local, unsynced changes are present.
           * Currently, this is used to indicate that the voicemail was read or deleted.
           * The value will be 1 if dirty is true, 0 if false.
           *
           * <p>When a caller updates a voicemail row (either with {@link ContentResolver#update} or
           * {@link ContentResolver#applyBatch}), and if the {@link ContentValues} doesn't contain
           * this column, the voicemail provider implicitly sets it to 0 if the calling package is
           * the {@link #SOURCE_PACKAGE} or to 1 otherwise. To prevent this behavior, explicitly set
           * {@link #DIRTY_RETAIN} to DIRTY in the {@link ContentValues}.
           *
           * <P>Type: INTEGER (boolean)</P>
           *
           * @see #DIRTY_RETAIN
           */
          public static final String DIRTY = "dirty";
  
          /**
           * Value of {@link #DIRTY} when updating to indicate that the value should not be updated
           * during this operation.
           */
          public static final int DIRTY_RETAIN = -1;
  
          /**
           * Flag used to indicate that the voicemail was deleted but not synced to the server.
           * A deleted row should be ignored.
           * The value will be 1 if deleted is true, 0 if false.
           * <P>Type: INTEGER (boolean)</P>
           */
          public static final String DELETED = "deleted";
  
          /**
           * The date the row is last inserted, updated, or marked as deleted, in milliseconds
           * since the epoch. Read only.
           * <P>Type: INTEGER (long)</P>
           */
          public static final String LAST_MODIFIED = "last_modified";
  
          /**
           * Flag to indicate the voicemail was backed up. The value will be 1 if backed up, 0 if
           * not.
           *
           * <P>Type: INTEGER (boolean)</P>
           */
          public static final String BACKED_UP = "backed_up";
  
          /**
           * Flag to indicate the voicemail was restored from a backup. The value will be 1 if
           * restored, 0 if not.
           *
           * <P>Type: INTEGER (boolean)</P>
           */
          public static final String RESTORED = "restored";
  
          /**
           * Flag to indicate the voicemail was marked as archived. Archived voicemail should not be
           * deleted even if it no longer exist on the server. The value will be 1 if archived true, 0
           * if not.
           *
           * <P>Type: INTEGER (boolean)</P>
           */
          public static final String ARCHIVED = "archived";
  
          /**
           * Flag to indicate the voicemail is a OMTP voicemail handled by the {@link
           * android.telephony.VisualVoicemailService}. The UI should only show OMTP voicemails from
           * the current visual voicemail package. For example, the selection could be
           * {@code WHERE (IS_OMTP_VOICEMAIL == 0) OR ( IS_OMTP_VOICEMAIL == 1 AND SOURCE_PACKAGE ==
           * "current.vvm.package")}
           *
           * <P>Type: INTEGER (boolean)</P>
           *
           * @see android.telephony.TelephonyManager#getVisualVoicemailPackageName
           */
          public static final String IS_OMTP_VOICEMAIL = "is_omtp_voicemail";
  
          /**
           * A convenience method to build voicemail URI specific to a source package by appending
           * {@link VoicemailContract#PARAM_KEY_SOURCE_PACKAGE} param to the base URI.
           */
          public static Uri buildSourceUri(String packageName) {
              return Voicemails.CONTENT_URI.buildUpon()
                      .appendQueryParameter(PARAM_KEY_SOURCE_PACKAGE, packageName)
                      .build();
          }
  
          /**
           * Inserts a new voicemail into the voicemail content provider.
           *
           * @param context The context of the app doing the inserting
           * @param voicemail Data to be inserted
           * @return {@link Uri} of the newly inserted {@link Voicemail}
           *
           * @hide
           */
          public static Uri insert(Context context, Voicemail voicemail) {
              ContentResolver contentResolver = context.getContentResolver();
              ContentValues contentValues = getContentValues(voicemail);
              return contentResolver.insert(buildSourceUri(context.getPackageName()), contentValues);
          }
  
          /**
           * Inserts a list of voicemails into the voicemail content provider.
           *
           * @param context The context of the app doing the inserting
           * @param voicemails Data to be inserted
           * @return the number of voicemails inserted
           *
           * @hide
           */
          public static int insert(Context context, List<Voicemail> voicemails) {
              ContentResolver contentResolver = context.getContentResolver();
              int count = voicemails.size();
              for (int i = 0; i < count; i++) {
                  ContentValues contentValues = getContentValues(voicemails.get(i));
                  contentResolver.insert(buildSourceUri(context.getPackageName()), contentValues);
              }
              return count;
          }
  
          /**
           * Clears all voicemails accessible to this voicemail content provider for the calling
           * package. By default, a package only has permission to delete voicemails it inserted.
           *
           * @return the number of voicemails deleted
           *
           * @hide
           */
          public static int deleteAll(Context context) {
              return context.getContentResolver().delete(
                      buildSourceUri(context.getPackageName()), "", new String[0]);
          }
  
          /**
           * Maps structured {@link Voicemail} to {@link ContentValues} in content provider.
           */
          private static ContentValues getContentValues(Voicemail voicemail) {
              ContentValues contentValues = new ContentValues();
              contentValues.put(Voicemails.DATE, String.valueOf(voicemail.getTimestampMillis()));
              contentValues.put(Voicemails.NUMBER, voicemail.getNumber());
              contentValues.put(Voicemails.DURATION, String.valueOf(voicemail.getDuration()));
              contentValues.put(Voicemails.SOURCE_PACKAGE, voicemail.getSourcePackage());
              contentValues.put(Voicemails.SOURCE_DATA, voicemail.getSourceData());
              contentValues.put(Voicemails.IS_READ, voicemail.isRead() ? 1 : 0);
  
              PhoneAccountHandle phoneAccount = voicemail.getPhoneAccount();
              if (phoneAccount != null) {
                  contentValues.put(Voicemails.PHONE_ACCOUNT_COMPONENT_NAME,
                          phoneAccount.getComponentName().flattenToString());
                  contentValues.put(Voicemails.PHONE_ACCOUNT_ID, phoneAccount.getId());
              }
  
              if (voicemail.getTranscription() != null) {
                  contentValues.put(Voicemails.TRANSCRIPTION, voicemail.getTranscription());
              }
  
              return contentValues;
          }
      }
  
      /** Defines fields exposed through the /status path of this content provider. */
      public static final class Status implements BaseColumns {
          /** URI to insert/retrieve status of voicemail source. */
          public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/status");
          /** The MIME type for a collection of voicemail source statuses. */
          public static final String DIR_TYPE = "vnd.android.cursor.dir/voicemail.source.status";
          /** The MIME type for a single voicemail source status entry. */
          public static final String ITEM_TYPE = "vnd.android.cursor.item/voicemail.source.status";
  
          /** Not instantiable. */
          private Status() {
          }
          /**
           * The package name of the voicemail source. There can only be a one entry per account
           * per source.
           * <P>Type: TEXT</P>
           */
          public static final String SOURCE_PACKAGE = SOURCE_PACKAGE_FIELD;
  
          /**
           * The type of the source, which determines how to interpret source-specific states.
           * Typically this will be set to the same string as
           * {@link android.telephony.CarrierConfigManager#KEY_VVM_TYPE_STRING}. For example,
           * "vvm_type_omtp".
           *
           * <P>Type: TEXT</P>
           *
           * @see #CONFIGURATION_STATE
           * @see #DATA_CHANNEL_STATE
           * @see #NOTIFICATION_CHANNEL_STATE
           */
          public static final String SOURCE_TYPE = "source_type";
  
          // Note: Multiple entries may exist for a single source if they are differentiated by the
          // PHONE_ACCOUNT_* fields.
  
          /**
           * The {@link ComponentName} of the {@link PhoneAccount} in string form. The
           * {@link PhoneAccount} differentiates voicemail sources from the same package.
           * <P>Type: TEXT</P>
           */
          public static final String PHONE_ACCOUNT_COMPONENT_NAME = "phone_account_component_name";
  
          /**
           * The identifier of a {@link PhoneAccount} that is unique to a specified component. The
           * {@link PhoneAccount} differentiates voicemail sources from the same package.
           * <P>Type: TEXT</P>
           */
          public static final String PHONE_ACCOUNT_ID = "phone_account_id";
  
          /**
           * The URI to call to invoke source specific voicemail settings screen. On a user request
           * to setup voicemail an intent with action VIEW with this URI will be fired by the system.
           * <P>Type: TEXT</P>
           */
          public static final String SETTINGS_URI = "settings_uri";
          /**
           * The URI to call when the user requests to directly access the voicemail from the remote
           * server. In case of an IVR voicemail system this is typically set to the the voicemail
           * number specified using a tel:/ URI.
           * <P>Type: TEXT</P>
           */
          public static final String VOICEMAIL_ACCESS_URI = "voicemail_access_uri";
          /**
           * The configuration state of the voicemail source.
           *
           * <P>Negative values are reserved to the source for source-specific states, see
           * {@link #SOURCE_TYPE}
           *
           * <P> Possible values:
           * {@link #CONFIGURATION_STATE_OK},
           * {@link #CONFIGURATION_STATE_NOT_CONFIGURED},
           * {@link #CONFIGURATION_STATE_CAN_BE_CONFIGURED}
           * {@link #CONFIGURATION_STATE_CONFIGURING}
           * {@link #CONFIGURATION_STATE_FAILED}
           * {@link #CONFIGURATION_STATE_DISABLED}
           * <P>Type: INTEGER</P>
           */
          public static final String CONFIGURATION_STATE = "configuration_state";
  
          /** Value of {@link #CONFIGURATION_STATE} to indicate an all OK configuration status. */
          public static final int CONFIGURATION_STATE_OK = 0;
          /**
           * Value of {@link #CONFIGURATION_STATE} to indicate the visual voicemail is not
           * yet configured on this device.
           */
          public static final int CONFIGURATION_STATE_NOT_CONFIGURED = 1;
          /**
           * Value of {@link #CONFIGURATION_STATE} to indicate the visual voicemail is not
           * yet configured on this device but can be configured by the user.
           * <p> This state must be used when the source has verified that the current user can be
           * upgraded to visual voicemail and would like to show a set up invitation message.
           */
          public static final int CONFIGURATION_STATE_CAN_BE_CONFIGURED = 2;
          /**
           * Value of {@link #CONFIGURATION_STATE} to indicate that visual voicemail still is being
           * configured.
           */
          public static final int CONFIGURATION_STATE_CONFIGURING = 3;
          /**
           * Value of {@link #CONFIGURATION_STATE} to indicate that visual voicemail has failed to
           * be configured.
           */
          public static final int CONFIGURATION_STATE_FAILED = 4;
          /**
           * Value of {@link #CONFIGURATION_STATE} to indicate that visual voicemail is disabled by
           * the user.
           */
          public static final int CONFIGURATION_STATE_DISABLED = 5;
          /**
           * The data channel state of the voicemail source. This the channel through which the source
           * pulls voicemail data from a remote server.
           *
           * <P>Negative values are reserved to the source for source-specific states, see
           * {@link #SOURCE_TYPE}
           *
           * <P> Possible values:
           * {@link #DATA_CHANNEL_STATE_OK},
           * {@link #DATA_CHANNEL_STATE_NO_CONNECTION}
           * </P>
           * <P>Type: INTEGER</P>
           */
          public static final String DATA_CHANNEL_STATE = "data_channel_state";
  
          /**
           *  Value of {@link #DATA_CHANNEL_STATE} to indicate that data channel is working fine.
           */
          public static final int DATA_CHANNEL_STATE_OK = 0;
          /**
           *  Value of {@link #DATA_CHANNEL_STATE} to indicate that data channel failed to find a
           *  suitable network to connect to the server.
           */
          public static final int DATA_CHANNEL_STATE_NO_CONNECTION = 1;
          /**
           *  Value of {@link #DATA_CHANNEL_STATE} to indicate that data channel failed to find a
           *  suitable network to connect to the server, and the carrier requires using cellular
           *  data network to connect to the server.
           */
          public static final int DATA_CHANNEL_STATE_NO_CONNECTION_CELLULAR_REQUIRED = 2;
          /**
           *  Value of {@link #DATA_CHANNEL_STATE} to indicate that data channel received incorrect
           *  settings or credentials to connect to the server
           */
          public static final int DATA_CHANNEL_STATE_BAD_CONFIGURATION = 3;
          /**
           *  Value of {@link #DATA_CHANNEL_STATE} to indicate that a error has occurred in the data
           *  channel while communicating with the server
           */
          public static final int DATA_CHANNEL_STATE_COMMUNICATION_ERROR = 4;
          /**
           *  Value of {@link #DATA_CHANNEL_STATE} to indicate that the server reported an internal
           *  error to the data channel.
           */
          public static final int DATA_CHANNEL_STATE_SERVER_ERROR = 5;
          /**
           *  Value of {@link #DATA_CHANNEL_STATE} to indicate that while there is a suitable network,
           *  the data channel is unable to establish a connection with the server.
           */
          public static final int DATA_CHANNEL_STATE_SERVER_CONNECTION_ERROR = 6;
  
          /**
           * The notification channel state of the voicemail source. This is the channel through which
           * the source gets notified of new voicemails on the remote server.
           *
           * <P>Negative values are reserved to the source for source-specific states, see
           * {@link #SOURCE_TYPE}
           *
           * <P> Possible values:
           * {@link #NOTIFICATION_CHANNEL_STATE_OK},
           * {@link #NOTIFICATION_CHANNEL_STATE_NO_CONNECTION},
           * {@link #NOTIFICATION_CHANNEL_STATE_MESSAGE_WAITING}
           * </P>
           * <P>Type: INTEGER</P>
           */
          public static final String NOTIFICATION_CHANNEL_STATE = "notification_channel_state";
  
          /**
           * Value of {@link #NOTIFICATION_CHANNEL_STATE} to indicate that the notification channel is
           * working fine.
           */
          public static final int NOTIFICATION_CHANNEL_STATE_OK = 0;
          /**
           * Value of {@link #NOTIFICATION_CHANNEL_STATE} to indicate that the notification channel
           * connection is not working.
           */
          public static final int NOTIFICATION_CHANNEL_STATE_NO_CONNECTION = 1;
          /**
           * Value of {@link #NOTIFICATION_CHANNEL_STATE} to indicate that there are messages waiting
           * on the server but the details are not known.
           * <p> Use this state when the notification can only tell that there are pending messages on
           * the server but no details of the sender/time etc are known.
           */
          public static final int NOTIFICATION_CHANNEL_STATE_MESSAGE_WAITING = 2;
  
          /**
           * Amount of resource that is used by existing voicemail in the visual voicemail inbox,
           * or {@link #QUOTA_UNAVAILABLE} if the quota has never been updated before. This value is
           * used to inform the client the situation on the remote server. Unit is not specified.
           * <P>Type: INTEGER</P>
           */
          public static final String QUOTA_OCCUPIED = "quota_occupied";
  
          /**
           * Total resource in the visual voicemail inbox that can be used, or
           * {@link #QUOTA_UNAVAILABLE} if server either has unlimited quota or does not provide quota
           * information. This value is used to inform the client the situation on the remote server.
           * Unit is not specified.
           * <P>Type: INTEGER</P>
           */
          public static final String QUOTA_TOTAL = "quota_total";
  
          /**
           * Value for {@link #QUOTA_OCCUPIED} and {@link #QUOTA_TOTAL} to indicate that no
           * information is available.
           */
          public static final int QUOTA_UNAVAILABLE = -1;
  
          /**
           * A convenience method to build status URI specific to a source package by appending
           * {@link VoicemailContract#PARAM_KEY_SOURCE_PACKAGE} param to the base URI.
           */
          public static Uri buildSourceUri(String packageName) {
              return Status.CONTENT_URI.buildUpon()
                      .appendQueryParameter(PARAM_KEY_SOURCE_PACKAGE, packageName).build();
          }
      }
  }
  