Update javadoc for BlockedNumberContract.

import android.os.Bundle;

/**

 * Constants and methods to access blocked phone numbers for incoming calls and texts.

 * <p>

 * The contract between the blockednumber provider and applications. Contains definitions for

 * the supported URIs and columns.

 * </p>

 *

 * TODO javadoc

 * - Proper javadoc tagging.

 * - Code sample?

 * - Describe who can access it.

 * <h3> Overview </h3>

 * <p>

 * The content provider exposes a table containing blocked numbers. The columns and URIs for

 * accessing this table are defined by the {@link BlockedNumbers} class. Messages, and calls from

 * blocked numbers are discarded by the platform. Notifications upon provider changes can be

 * received using a {@link android.database.ContentObserver}.

 * </p>

 *

 * <h3> Permissions </h3>

 * <p>

 * Only the system, the default SMS application, and the default phone app

 * (See {@link android.telecom.TelecomManager#getDefaultDialerPackage()}), and carrier apps

 * (See {@link android.service.carrier.CarrierService}) can read, and write to the blockednumber

 * provider.

 * </p>

 *

 * <h3> Data </h3>

 * <p>

 * Other than regular phone numbers, the blocked number provider can also store addresses (such

 * as email) from which a user can receive messages, and calls. The blocked numbers are stored

 * in the {@link BlockedNumbers#COLUMN_ORIGINAL_NUMBER} column. A normalized version of phone

 * numbers (if normalization is possible) is stored in {@link BlockedNumbers#COLUMN_E164_NUMBER}

 * column. The platform blocks calls, and messages from an address if it is present in in the

 * {@link BlockedNumbers#COLUMN_ORIGINAL_NUMBER} column or if the E164 version of the address

 * matches the {@link BlockedNumbers#COLUMN_E164_NUMBER} column.

 * </p>

 *

 * <h3> Operations </h3>

 * <dl>

 * <dt><b>Insert</b></dt>

 * <dd>

 * <p>

 * {@link BlockedNumbers#COLUMN_ORIGINAL_NUMBER} is a required column that needs to be populated.

 * Apps can optionally provide the {@link BlockedNumbers#COLUMN_E164_NUMBER} which is the phone

 * number's E164 representation. The provider automatically populates this column if the app does

 * not provide it. Note that this column is not populated if normalization fails or if the address

 * is not a phone number (eg: email). The provider enforces uniqueness constraint on this column.

 * Examples:

 * <pre>

 * ContentValues values = new ContentValues();

 * values.put(BlockedNumbers.COLUMN_ORIGINAL_NUMBER, "1234567890");

 * Uri uri = getContentResolver().insert(BlockedNumbers.CONTENT_URI, values);

 * </pre>

 * <pre>

 * ContentValues values = new ContentValues();

 * values.put(BlockedNumbers.COLUMN_ORIGINAL_NUMBER, "1234567890");

 * values.put(BlockedNumbers.COLUMN_E164_NUMBER, "+11234567890");

 * Uri uri = getContentResolver().insert(BlockedNumbers.CONTENT_URI, values);

 * </pre>

 * <pre>

 * ContentValues values = new ContentValues();

 * values.put(BlockedNumbers.COLUMN_ORIGINAL_NUMBER, "12345@abdcde.com");

 * Uri uri = getContentResolver().insert(BlockedNumbers.CONTENT_URI, values);

 * </pre>

 * </p>

 * </dd>

 * <dt><b>Update</b></dt>

 * <dd>

 * <p>

 * Updates are not supported. Use Delete, and Insert instead.

 * </p>

 * </dd>

 * <dt><b>Delete</b></dt>

 * <dd>

 * <p>

 * Deletions can be performed as follows:

 * <pre>

 * ContentValues values = new ContentValues();

 * values.put(BlockedNumbers.COLUMN_ORIGINAL_NUMBER, "1234567890");

 * Uri uri = getContentResolver().insert(BlockedNumbers.CONTENT_URI, values);

 * getContentResolver().delete(uri, null, null);

 * </pre>

 * </p>

 * </dd>

 * <dt><b>Query</b></dt>

 * <dd>

 * <p>

 * All blocked numbers can be enumerated as follows:

 * <pre>

 * Cursor c = getContentResolver().query(BlockedNumbers.CONTENT_URI,

 *          new String[]{BlockedNumbers.COLUMN_ID, BlockedNumbers.COLUMN_ORIGINAL_NUMBER,

 *          BlockedNumbers.COLUMN_E164_NUMBER}, null, null, null);

 * </pre>

 * To check if a particular number is blocked, use the method

 * {@link #isBlocked(Context, String)}.

 * </p>

 * </dd>

 *

 * <h3> Multi-user </h3>

 * <p>

 * Apps must use the method {@link #canCurrentUserBlockNumbers(Context)} before performing any

 * operation on the blocked number provider. If {@link #canCurrentUserBlockNumbers(Context)} returns

 * {@code false}, all operations on the provider will fail with an

 * {@link UnsupportedOperationException}. The platform will block calls, and messages from numbers

 * in the provider independent of the current user.

 * </p>

 */

public class BlockedNumberContract {

    private BlockedNumberContract() {

    }

    /** The authority for the contacts provider */

    /** The authority for the blocked number provider */

    public static final String AUTHORITY = "com.android.blockednumber";

    /** A content:// style uri to the authority for the contacts provider */

    /** A content:// style uri to the authority for the blocked number provider */

    public static final Uri AUTHORITY_URI = Uri.parse("content://" + AUTHORITY);

    /**

     * TODO javadoc

     *

     * Constants to interact with the blocked phone number list.

     * Constants to interact with the blocked numbers list.

     */

    public static class BlockedNumbers {

        private BlockedNumbers() {

        }

        /**

         * TODO javadoc

         *

         * Content URI for the blocked numbers.

         *

         * Supported operations

     * context {@code context}, this method will throw an {@link UnsupportedOperationException}.

     */

    public static boolean isBlocked(Context context, String phoneNumber) {

        final Bundle res = context.getContentResolver().call(AUTHORITY_URI,

                METHOD_IS_BLOCKED, phoneNumber, null);

        final Bundle res = context.getContentResolver().call(

                AUTHORITY_URI, METHOD_IS_BLOCKED, phoneNumber, null);

        return res != null && res.getBoolean(RES_NUMBER_IS_BLOCKED, false);

    }