/*
*******************************************************************************
*
*   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"

U_CAPI void U_EXPORT2
uenum_close(UEnumeration* en)
{
    if (en) {
        if (en->close != NULL) {
            if (en->baseContext) {
                uprv_free(en->baseContext);
            }
            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;
    }
}

/* Don't call this directly. Only uenum_unext should be calling this. */
U_CAPI const UChar* U_EXPORT2
uenum_unextDefault(UEnumeration* en,
            int32_t* resultLength,
            UErrorCode* status)
{
    if (en->next != NULL) {
        const char *tempCharVal = en->next(en, resultLength, status);
        UChar *tempUCharVal;

        if (en->baseContext) {
            uprv_free(en->baseContext);
        }
        tempUCharVal = uprv_malloc((*resultLength+1) * sizeof(UChar));
        if (!tempUCharVal) {
            *status = U_MEMORY_ALLOCATION_ERROR;
        }
        u_charsToUChars(tempCharVal, tempUCharVal, *resultLength + 1);
        en->baseContext = tempUCharVal;
        return tempUCharVal;
    } else {
        *status = U_UNSUPPORTED_ERROR;
        return NULL;
    }
}

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;
    }
}