appendable.h

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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*   Copyright (C) 2011-2012, International Business Machines
*   Corporation and others.  All Rights Reserved.
*******************************************************************************
*   file name:  appendable.h
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2010dec07
*   created by: Markus W. Scherer
*/

#ifndef __APPENDABLE_H__
#define __APPENDABLE_H__

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#include "unicode/uobject.h"

U_NAMESPACE_BEGIN

class UnicodeString;

class U_COMMON_API Appendable : public UObject {
public:
    ~Appendable();

    virtual UBool appendCodeUnit(char16_t c) = 0;

    virtual UBool appendCodePoint(UChar32 c);

    virtual UBool appendString(const char16_t *s, int32_t length);

    virtual UBool reserveAppendCapacity(int32_t appendCapacity);

    virtual char16_t *getAppendBuffer(int32_t minCapacity,
                                   int32_t desiredCapacityHint,
                                   char16_t *scratch, int32_t scratchCapacity,
                                   int32_t *resultCapacity);
};

class U_COMMON_API UnicodeStringAppendable : public Appendable {
public:
    explicit UnicodeStringAppendable(UnicodeString &s) : str(s) {}

    ~UnicodeStringAppendable();

    virtual UBool appendCodeUnit(char16_t c) override;

    virtual UBool appendCodePoint(UChar32 c) override;

    virtual UBool appendString(const char16_t *s, int32_t length) override;

    virtual UBool reserveAppendCapacity(int32_t appendCapacity) override;

    virtual char16_t *getAppendBuffer(int32_t minCapacity,
                                   int32_t desiredCapacityHint,
                                   char16_t *scratch, int32_t scratchCapacity,
                                   int32_t *resultCapacity) override;

private:
    UnicodeString &str;
};

U_NAMESPACE_END

#endif /* U_SHOW_CPLUSPLUS_API */

#endif  // __APPENDABLE_H__