Check in the pristine copy of ICU 4.6...

icu46/source/common/unicode/uenum.h

+/*
+*******************************************************************************
+*
+*   Copyright (C) 2002-2010, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+*******************************************************************************
+*   file name:  uenum.h
+*   encoding:   US-ASCII
+*   tab size:   8 (not used)
+*   indentation:2
+*
+*   created on: 2002jul08
+*   created by: Vladimir Weinstein
+*/
+
+#ifndef __UENUM_H
+#define __UENUM_H
+
+#include "unicode/utypes.h"
+#include "unicode/localpointer.h"
+
+#if U_SHOW_CPLUSPLUS_API
+#include "unicode/strenum.h"
+#endif
+
+/**
+ * \file
+ * \brief C API: String Enumeration 
+ */
+ 
+/**
+ * An enumeration object.
+ * For usage in C programs.
+ * @stable ICU 2.2
+ */
+struct UEnumeration;
+/** structure representing an enumeration object instance @stable ICU 2.2 */
+typedef struct UEnumeration UEnumeration;
+
+/**
+ * Disposes of resources in use by the iterator.  If en is NULL,
+ * does nothing.  After this call, any char* or UChar* pointer
+ * returned by uenum_unext() or uenum_next() is invalid.
+ * @param en UEnumeration structure pointer
+ * @stable ICU 2.2
+ */
+U_STABLE void U_EXPORT2
+uenum_close(UEnumeration* en);
+
+#if U_SHOW_CPLUSPLUS_API
+
+U_NAMESPACE_BEGIN
+
+/**
+ * \class LocalUEnumerationPointer
+ * "Smart pointer" class, closes a UEnumeration via uenum_close().
+ * For most methods see the LocalPointerBase base class.
+ *
+ * @see LocalPointerBase
+ * @see LocalPointer
+ * @stable ICU 4.4
+ */
+U_DEFINE_LOCAL_OPEN_POINTER(LocalUEnumerationPointer, UEnumeration, uenum_close);
+
+U_NAMESPACE_END
+
+#endif
+
+/**
+ * Returns the number of elements that the iterator traverses.  If
+ * the iterator is out-of-sync with its service, status is set to
+ * U_ENUM_OUT_OF_SYNC_ERROR.
+ * This is a convenience function. It can end up being very
+ * expensive as all the items might have to be pre-fetched (depending
+ * on the type of data being traversed). Use with caution and only 
+ * when necessary.
+ * @param en UEnumeration structure pointer
+ * @param status error code, can be U_ENUM_OUT_OF_SYNC_ERROR if the
+ *               iterator is out of sync.
+ * @return number of elements in the iterator
+ * @stable ICU 2.2
+ */
+U_STABLE int32_t U_EXPORT2
+uenum_count(UEnumeration* en, UErrorCode* status);
+
+/**
+ * Returns the next element in the iterator's list.  If there are
+ * no more elements, returns NULL.  If the iterator is out-of-sync
+ * with its service, status is set to U_ENUM_OUT_OF_SYNC_ERROR and
+ * NULL is returned.  If the native service string is a char* string,
+ * it is converted to UChar* with the invariant converter.
+ * The result is terminated by (UChar)0.
+ * @param en the iterator object
+ * @param resultLength pointer to receive the length of the result
+ *                     (not including the terminating \\0).
+ *                     If the pointer is NULL it is ignored.
+ * @param status the error code, set to U_ENUM_OUT_OF_SYNC_ERROR if
+ *               the iterator is out of sync with its service.
+ * @return a pointer to the string.  The string will be
+ *         zero-terminated.  The return pointer is owned by this iterator
+ *         and must not be deleted by the caller.  The pointer is valid
+ *         until the next call to any uenum_... method, including
+ *         uenum_next() or uenum_unext().  When all strings have been
+ *         traversed, returns NULL.
+ * @stable ICU 2.2
+ */
+U_STABLE const UChar* U_EXPORT2
+uenum_unext(UEnumeration* en,
+            int32_t* resultLength,
+            UErrorCode* status);
+
+/**
+ * Returns the next element in the iterator's list.  If there are
+ * no more elements, returns NULL.  If the iterator is out-of-sync
+ * with its service, status is set to U_ENUM_OUT_OF_SYNC_ERROR and
+ * NULL is returned.  If the native service string is a UChar*
+ * string, it is converted to char* with the invariant converter.
+ * The result is terminated by (char)0.  If the conversion fails
+ * (because a character cannot be converted) then status is set to
+ * U_INVARIANT_CONVERSION_ERROR and the return value is undefined
+ * (but non-NULL).
+ * @param en the iterator object
+ * @param resultLength pointer to receive the length of the result
+ *                     (not including the terminating \\0).
+ *                     If the pointer is NULL it is ignored.
+ * @param status the error code, set to U_ENUM_OUT_OF_SYNC_ERROR if
+ *               the iterator is out of sync with its service.  Set to
+ *               U_INVARIANT_CONVERSION_ERROR if the underlying native string is
+ *               UChar* and conversion to char* with the invariant converter
+ *               fails. This error pertains only to current string, so iteration
+ *               might be able to continue successfully.
+ * @return a pointer to the string.  The string will be
+ *         zero-terminated.  The return pointer is owned by this iterator
+ *         and must not be deleted by the caller.  The pointer is valid
+ *         until the next call to any uenum_... method, including
+ *         uenum_next() or uenum_unext().  When all strings have been
+ *         traversed, returns NULL.
+ * @stable ICU 2.2
+ */
+U_STABLE const char* U_EXPORT2
+uenum_next(UEnumeration* en,
+           int32_t* resultLength,
+           UErrorCode* status);
+
+/**
+ * Resets the iterator to the current list of service IDs.  This
+ * re-establishes sync with the service and rewinds the iterator
+ * to start at the first element.
+ * @param en the iterator object
+ * @param status the error code, set to U_ENUM_OUT_OF_SYNC_ERROR if
+ *               the iterator is out of sync with its service.  
+ * @stable ICU 2.2
+ */
+U_STABLE void U_EXPORT2
+uenum_reset(UEnumeration* en, UErrorCode* status);
+
+#if U_SHOW_CPLUSPLUS_API
+
+/**
+ * Given a StringEnumeration, wrap it in a UEnumeration.  The
+ * StringEnumeration is adopted; after this call, the caller must not
+ * delete it (regardless of error status).
+ * @param adopted the C++ StringEnumeration to be wrapped in a UEnumeration.
+ * @param ec the error code.
+ * @return a UEnumeration wrapping the adopted StringEnumeration.
+ * @draft ICU 4.2
+ */
+U_CAPI UEnumeration* U_EXPORT2
+uenum_openFromStringEnumeration(U_NAMESPACE_QUALIFIER StringEnumeration* adopted, UErrorCode* ec);
+
+#endif
+
+#endif