//------------------------------------------------------------------------------
/*
    This file is part of Beast: https://github.com/vinniefalco/Beast
    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>

    Portions of this file are from JUCE.
    Copyright (c) 2013 - Raw Material Software Ltd.
    Please visit http://www.juce.com

    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

#ifndef BEAST_STRINGPOOL_BEASTHEADER
#define BEAST_STRINGPOOL_BEASTHEADER

#include "beast_String.h"
#include "../containers/beast_Array.h"


//==============================================================================
/**
    A StringPool holds a set of shared strings, which reduces storage overheads and improves
    comparison speed when dealing with many duplicate strings.

    When you add a string to a pool using getPooledString, it'll return a character
    array containing the same string. This array is owned by the pool, and the same array
    is returned every time a matching string is asked for. This means that it's trivial to
    compare two pooled strings for equality, as you can simply compare their pointers. It
    also cuts down on storage if you're using many copies of the same string.
*/
class BEAST_API StringPool
{
public:
    //==============================================================================
    /** Creates an empty pool. */
    StringPool() noexcept;

    /** Destructor */
    ~StringPool();

    //==============================================================================
    /** Returns a pointer to a copy of the string that is passed in.

        The pool will always return the same pointer when asked for a string that matches it.
        The pool will own all the pointers that it returns, deleting them when the pool itself
        is deleted.
    */
    String::CharPointerType getPooledString (const String& original);

    /** Returns a pointer to a copy of the string that is passed in.

        The pool will always return the same pointer when asked for a string that matches it.
        The pool will own all the pointers that it returns, deleting them when the pool itself
        is deleted.
    */
    String::CharPointerType getPooledString (const char* original);

    /** Returns a pointer to a copy of the string that is passed in.

        The pool will always return the same pointer when asked for a string that matches it.
        The pool will own all the pointers that it returns, deleting them when the pool itself
        is deleted.
    */
    String::CharPointerType getPooledString (const wchar_t* original);

    //==============================================================================
    /** Returns the number of strings in the pool. */
    int size() const noexcept;

    /** Returns one of the strings in the pool, by index. */
    String::CharPointerType operator[] (int index) const noexcept;

private:
    Array <String> strings;
    CriticalSection lock;
};


#endif   // BEAST_STRINGPOOL_BEASTHEADER
