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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls;

/*
 * RFC 6520
 */
public class HeartbeatMode
{
    public static final short peer_allowed_to_send = 1;
    public static final short peer_not_allowed_to_send = 2;

    public static String getName(short heartbeatMode)
    {
        switch (heartbeatMode)
        {
        case peer_allowed_to_send:
            return "peer_allowed_to_send";
        case peer_not_allowed_to_send:
            return "peer_not_allowed_to_send";
        default:
            return "UNKNOWN";
        }
    }

    public static String getText(short heartbeatMode)
    {
        return getName(heartbeatMode) + "(" + heartbeatMode + ")";
    }

    public static boolean isValid(short heartbeatMode)
    {
        return heartbeatMode >= peer_allowed_to_send && heartbeatMode <= peer_not_allowed_to_send;
    }
}