/*
*******************************************************************************
*
*   Copyright (C) 2002, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
*******************************************************************************
*   file name:  uenum.c
*   encoding:   US-ASCII
*   tab size:   8 (not used)
*   indentation:2
*
*   created on: 2002jul08
*   created by: Vladimir Weinstein
*/

#include "uenumimp.h"
#include "cmemory.h"

static const UEnumeration nullEnumeration = {
    NULL, /* context */
    NULL, /* close */
    NULL, /* count */
    NULL, /* uNext */
    NULL, /* next */
    NULL  /* reset */
};

U_CAPI void U_EXPORT2
uenum_close(UEnumeration* en)
{
    if (en) {
        if (en->close != NULL) {
            en->close(en);
        } else { /* this seems dangerous, but we better kill the object */
            uprv_free(en);
        }
    }
}

U_CAPI int32_t U_EXPORT2
uenum_count(UEnumeration* en, UErrorCode* status)
{
    if (!en || U_FAILURE(*status)) {
        return -1;
    }
    if (en->count != NULL) {
        return en->count(en, status);
    } else {
        *status = U_UNSUPPORTED_ERROR;
        return -1;
    }
}

U_CAPI const UChar* U_EXPORT2
uenum_unext(UEnumeration* en,
            int32_t* resultLength,
            UErrorCode* status)
{
    if (!en || U_FAILURE(*status)) {
        return NULL;
    }
    if (en->uNext != NULL) {
        return en->uNext(en, resultLength, status);
    } else {
        *status = U_UNSUPPORTED_ERROR;
        return NULL;
    }
}

U_CAPI const char* U_EXPORT2
uenum_next(UEnumeration* en,
          int32_t* resultLength,
          UErrorCode* status)
{
    if (!en || U_FAILURE(*status)) {
        return NULL;
    }
    if (en->next != NULL) {
        return en->next(en, resultLength, status);
    } else {
        *status = U_UNSUPPORTED_ERROR;
        return NULL;
    }
}

U_CAPI void U_EXPORT2
uenum_reset(UEnumeration* en, UErrorCode* status)
{
    if (!en || U_FAILURE(*status)) {
        return;
    }
    if (en->reset != NULL) {
        en->reset(en, status);
    } else {
        *status = U_UNSUPPORTED_ERROR;
    }
}