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Java Implementation of the Short Message Peer to Peer API.
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package ie.omk.smpp.util;

import java.util.Hashtable;
import java.util.Map;

/**
 * GSM constant values. This class includes static values for known Type-of
 * numbers, numbering plan indicators and GSM error codes.
 */
public final class GSMConstants {
    /** No error */
    public static final int GSM_ERR_NONE = 0;

    /** Customer unknown */
    public static final int GSM_ERR_P_UNKNOWN = 1;

    /** Not provisioned */
    public static final int GSM_ERR_P_PROVISION = 11;

    /** Call barred */
    public static final int GSM_ERR_T_BARRED = 13;

    /** CUG reject */
    public static final int GSM_ERR_P_CUG = 15;

    /** SMS not supported by MS */
    public static final int GSM_ERR_T_MSSUPPORT = 19;

    /** error in receiving MS */
    public static final int GSM_ERR_T_MSERROR = 20;

    /** facility not supported */
    public static final int GSM_ERR_T_SUPPORT = 21;

    /** memory capacity exceeded */
    public static final int GSM_ERR_T_MEMCAP = 22;

    /** absent subscriber */
    public static final int GSM_ERR_T_ABSENT = 29;

    /** absent subscriber detached */
    public static final int GSM_ERR_T_ABSENT_DETACHED = 30;

    /** MS didn't respond to 2 pages */
    public static final int GSM_ERR_T_ABSENT_PAGEFAIL = 31;

    /** Subscriber roamed to new PLMN */
    public static final int GSM_ERR_T_SUPPORT_ROAMING = 32;

    /** system failure */
    public static final int GSM_ERR_T_SYSTEM = 36;

    public static final int GSM_TON_UNKNOWN = 0;

    public static final int GSM_TON_INTERNATIONAL = 1;

    public static final int GSM_TON_NATIONAL = 2;

    public static final int GSM_TON_NETWORK = 3;

    public static final int GSM_TON_SUBSCRIBER = 4;

    public static final int GSM_TON_ALPHANUMERIC = 5;

    public static final int GSM_TON_ABBREVIATED = 6;

    public static final int GSM_TON_RESERVED_EXTN = 7;

    public static final int GSM_NPI_UNKNOWN = 0;

    public static final int GSM_NPI_E164 = 1;

    public static final int GSM_NPI_ISDN = GSM_NPI_E164;

    public static final int GSM_NPI_X121 = 3;

    public static final int GSM_NPI_TELEX = 4;

    public static final int GSM_NPI_NATIONAL = 8;

    public static final int GSM_NPI_PRIVATE = 9;

    public static final int GSM_NPI_ERMES = 10;

    public static final int GSM_NPI_RESERVED_EXTN = 15;

    private static Map errorTable = new Hashtable();

    // Prevent class from being instansiated.
    private GSMConstants() {
    }

    private static void initTables() {
        synchronized (errorTable) {
            if (errorTable.size() > 0) {
                return;
            }
        }

        // Error table
        errorTable.put(new Integer(GSM_ERR_NONE), "No error");
        errorTable.put(new Integer(GSM_ERR_P_UNKNOWN), "Unknown Customer");
        errorTable.put(new Integer(GSM_ERR_P_PROVISION), "Not provisioned");
        errorTable.put(new Integer(GSM_ERR_T_BARRED), "Call is barred");
        errorTable.put(new Integer(GSM_ERR_P_CUG), "CUG Rejected");
        errorTable.put(new Integer(GSM_ERR_T_MSSUPPORT),
                "Sms not supported by MS");
        errorTable
                .put(new Integer(GSM_ERR_T_MSERROR), "Error in receiveing MS");
        errorTable
                .put(new Integer(GSM_ERR_T_SUPPORT), "Facility not supported");
        errorTable.put(new Integer(GSM_ERR_T_MEMCAP),
                "Memory capacity exceeded");
        errorTable.put(new Integer(GSM_ERR_T_ABSENT), "Absent Subscriber");
        errorTable.put(new Integer(GSM_ERR_T_ABSENT_DETACHED),
                "Absent Subscriber detached");
        errorTable.put(new Integer(GSM_ERR_T_ABSENT_PAGEFAIL),
                "MS did not respond to 2 pages");
        errorTable.put(new Integer(GSM_ERR_T_SUPPORT_ROAMING),
                "Subscriber roamed to new PLMN");
        errorTable.put(new Integer(GSM_ERR_T_SYSTEM), "System failure");
    }

    /**
     * Get a string for the GSM error code.
     */
    public static String getGsmErr(int code) {
        initTables();
        String s = (String) errorTable.get(new Integer(code));
        return s == null ? "" : s;
    }
}