/*

******************************************************************************

*   Copyright (C) 1997-2004, International Business Machines

*   Corporation and others.  All Rights Reserved.

******************************************************************************

*   Date        Name        Description

*   03/28/00    aliu        Creation.

******************************************************************************

*/

#ifndef HASH_H

#define HASH_H

#include "unicode/unistr.h"

#include "unicode/uobject.h"

#include "uhash.h"

U_NAMESPACE_BEGIN

/**

 * Hashtable is a thin C++ wrapper around UHashtable, a general-purpose void*

 * hashtable implemented in C.  Hashtable is designed to be idiomatic and

 * easy-to-use in C++.

 *

 * Hashtable is an INTERNAL CLASS.

 */

class U_COMMON_API Hashtable : public UMemory {

    UHashtable* hash;

    inline void init(UHashFunction *keyHash, UKeyComparator *keyComp, UErrorCode& status);

public:

    /**

     * Construct a hashtable

     * @param ignoreKeyCase If true, keys are case insensitive.

     * @param status Error code

    */

    Hashtable(UBool ignoreKeyCase, UErrorCode& status);

    /**

     * Construct a hashtable

     * @param status Error code

    */

    Hashtable(UErrorCode& status);

    /**

     * Construct a hashtable, _disregarding any error_.  Use this constructor

     * with caution.

     */

    Hashtable();

    /**

     * Non-virtual destructor; make this virtual if Hashtable is subclassed

     * in the future.

     */

    ~Hashtable();

    UObjectDeleter *setValueDeleter(UObjectDeleter *fn);

    int32_t count() const;

    void* put(const UnicodeString& key, void* value, UErrorCode& status);

    int32_t puti(const UnicodeString& key, int32_t value, UErrorCode& status);

    void* get(const UnicodeString& key) const;

    int32_t geti(const UnicodeString& key) const;

    void* remove(const UnicodeString& key);

    int32_t removei(const UnicodeString& key);

    void removeAll(void);

    const UHashElement* find(const UnicodeString& key) const;

    const UHashElement* nextElement(int32_t& pos) const;

private:

    Hashtable(const Hashtable &other); // forbid copying of this class

    Hashtable &operator=(const Hashtable &other); // forbid copying of this class

};

/*********************************************************************

 * Implementation

 ********************************************************************/

inline void Hashtable::init(UHashFunction *keyHash, UKeyComparator *keyComp, UErrorCode& status) {

    if (U_FAILURE(status)) {

        return;

    }

    hash = uhash_open(keyHash, keyComp, &status);

    if (U_SUCCESS(status)) {

        uhash_setKeyDeleter(hash, uhash_deleteUnicodeString);

    }

}

inline Hashtable::Hashtable(UBool ignoreKeyCase, UErrorCode& status)

 : hash(0)

{

    init(ignoreKeyCase ? uhash_hashCaselessUnicodeString

                        : uhash_hashUnicodeString,

            ignoreKeyCase ? uhash_compareCaselessUnicodeString

                        : uhash_compareUnicodeString,

            status);

}

inline Hashtable::Hashtable(UErrorCode& status)

 : hash(0)

{

    init(uhash_hashUnicodeString, uhash_compareUnicodeString, status);

}

inline Hashtable::Hashtable()

 : hash(0)

{

    UErrorCode status = U_ZERO_ERROR;

    init(uhash_hashUnicodeString, uhash_compareUnicodeString, status);

}

inline Hashtable::~Hashtable() {

    if (hash != 0) {

        uhash_close(hash);

        hash = 0;

    }

}

inline UObjectDeleter *Hashtable::setValueDeleter(UObjectDeleter *fn) {

    return uhash_setValueDeleter(hash, fn);

}

inline int32_t Hashtable::count() const {

    return uhash_count(hash);

}

inline void* Hashtable::put(const UnicodeString& key, void* value, UErrorCode& status) {

    return uhash_put(hash, new UnicodeString(key), value, &status);

}

inline int32_t Hashtable::puti(const UnicodeString& key, int32_t value, UErrorCode& status) {

    return uhash_puti(hash, new UnicodeString(key), value, &status);

}

inline void* Hashtable::get(const UnicodeString& key) const {

    return uhash_get(hash, &key);

}

inline int32_t Hashtable::geti(const UnicodeString& key) const {

    return uhash_geti(hash, &key);

}

inline void* Hashtable::remove(const UnicodeString& key) {

    return uhash_remove(hash, &key);

}

inline int32_t Hashtable::removei(const UnicodeString& key) {

    return uhash_removei(hash, &key);

}

inline const UHashElement* Hashtable::find(const UnicodeString& key) const {

    return uhash_find(hash, &key);

}

inline const UHashElement* Hashtable::nextElement(int32_t& pos) const {

    return uhash_nextElement(hash, &pos);

}

inline void Hashtable::removeAll(void) {

  uhash_removeAll(hash);

}

U_NAMESPACE_END

#endif