/**
 * @file llfixedbuffer.cpp
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */
#include "linden_common.h"

#include "llfixedbuffer.h"

////////////////////////////////////////////////////////////////////////////

LLFixedBuffer::LLFixedBuffer(const U32 max_lines)
    : LLLineBuffer(),
      mMaxLines(max_lines),
      mMutex()
{
    mTimer.reset();
}

LLFixedBuffer::~LLFixedBuffer()
{
    clear();
}

void LLFixedBuffer::clear()
{
    mMutex.lock() ;
    mLines.clear();
    mAddTimes.clear();
    mLineLengths.clear();
    mMutex.unlock() ;

    mTimer.reset();
}


void LLFixedBuffer::addLine(const std::string& utf8line)
{
    LLWString wstring = utf8str_to_wstring(utf8line);
    addWLine(wstring);
}

void LLFixedBuffer::addWLine(const LLWString& line)
{
    if (line.empty())
    {
        return;
    }

    removeExtraLines();

    mMutex.lock() ;
    mLines.push_back(line);
    mLineLengths.push_back((S32)line.length());
    mAddTimes.push_back(mTimer.getElapsedTimeF32());
    mMutex.unlock() ;
}


void LLFixedBuffer::setMaxLines(S32 max_lines)
{
    mMaxLines = max_lines;

    removeExtraLines();
}


void LLFixedBuffer::removeExtraLines()
{
    mMutex.lock() ;
    while ((S32)mLines.size() > llmax((S32)0, (S32)(mMaxLines - 1)))
    {
        mLines.pop_front();
        mAddTimes.pop_front();
        mLineLengths.pop_front();
    }
    mMutex.unlock() ;
}