139 lines
4.5 KiB
C++
139 lines
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include <sal/config.h>
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#include "Clob.hxx"
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#include "Blob.hxx"
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#include <connectivity/CommonTools.hxx>
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#include <connectivity/dbexception.hxx>
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using namespace ::connectivity::firebird;
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using namespace ::osl;
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using namespace ::com::sun::star;
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using namespace ::com::sun::star::io;
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using namespace ::com::sun::star::sdbc;
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using namespace ::com::sun::star::uno;
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Clob::Clob(isc_db_handle* pDatabaseHandle,
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isc_tr_handle* pTransactionHandle,
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ISC_QUAD const & aBlobID):
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Clob_BASE(m_aMutex),
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m_aBlob(new connectivity::firebird::Blob(pDatabaseHandle, pTransactionHandle, aBlobID)),
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m_nCharCount(-1)
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{
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}
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void SAL_CALL Clob::disposing()
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{
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m_aBlob->dispose();
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m_aBlob.clear();
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Clob_BASE::disposing();
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}
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sal_Int64 SAL_CALL Clob::length()
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{
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MutexGuard aGuard(m_aMutex);
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checkDisposed(Clob_BASE::rBHelper.bDisposed);
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if( m_nCharCount >= 0 )
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return m_nCharCount;
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m_nCharCount = 0;
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// Read each segment, and calculate it's size by interpreting it as a
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// character stream. Assume that no characters are split by the segments.
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bool bLastSegmRead = false;
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std::vector<char> aSegmentBytes;
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do
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{
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bLastSegmRead = m_aBlob->readOneSegment( aSegmentBytes );
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OUString sSegment(aSegmentBytes.data(), aSegmentBytes.size(), RTL_TEXTENCODING_UTF8);
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if( !bLastSegmRead)
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m_nCharCount += sSegment.getLength();
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}while( !bLastSegmRead );
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m_aBlob->closeInput(); // reset position
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return m_nCharCount;
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}
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OUString SAL_CALL Clob::getSubString(sal_Int64 nPosition,
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sal_Int32 nLength)
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{
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if (nPosition < 1) // XClob is indexed from 1
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throw lang::IllegalArgumentException(u"nPosition < 1"_ustr, *this, 0);
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--nPosition; // make 0-based
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if (nLength < 0)
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throw lang::IllegalArgumentException(u"nLength < 0"_ustr, *this, 0);
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MutexGuard aGuard(m_aMutex);
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checkDisposed(Clob_BASE::rBHelper.bDisposed);
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// TODO do not reset position if it is not necessary
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m_aBlob->closeInput(); // reset position
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OUStringBuffer sSegmentBuffer;
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std::vector<char> aSegmentBytes;
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for (;;)
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{
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bool bLastRead = m_aBlob->readOneSegment( aSegmentBytes );
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// TODO: handle possible case of split UTF-8 character
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OUString sSegment(aSegmentBytes.data(), aSegmentBytes.size(), RTL_TEXTENCODING_UTF8);
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// skip irrelevant parts
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if (sSegment.getLength() < nPosition)
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{
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if (bLastRead)
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throw lang::IllegalArgumentException(u"nPosition out of range"_ustr, *this, 0);
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nPosition -= sSegment.getLength();
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continue;
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}
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// Getting here for the first time, nPosition may be > 0, meaning copy start offset.
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// This also handles sSegment.getLength() == nPosition case, including nLength == 0.
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const sal_Int32 nCharsToCopy = std::min<sal_Int32>(sSegment.getLength() - nPosition,
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nLength - sSegmentBuffer.getLength());
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sSegmentBuffer.append(sSegment.subView(nPosition, nCharsToCopy));
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if (sSegmentBuffer.getLength() == nLength)
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return sSegmentBuffer.makeStringAndClear();
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assert(sSegmentBuffer.getLength() < nLength);
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if (bLastRead)
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throw lang::IllegalArgumentException(u"out of range"_ustr, *this, 0);
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nPosition = 0; // No offset after first append
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}
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}
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uno::Reference< XInputStream > SAL_CALL Clob::getCharacterStream()
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{
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MutexGuard aGuard(m_aMutex);
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checkDisposed(Clob_BASE::rBHelper.bDisposed);
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return m_aBlob->getBinaryStream();
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}
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sal_Int64 SAL_CALL Clob::position(const OUString& /*rPattern*/,
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sal_Int32 /*nStart*/)
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{
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::dbtools::throwFeatureNotImplementedSQLException(u"Clob::position"_ustr, *this);
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}
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sal_Int64 SAL_CALL Clob::positionOfClob(const Reference <XClob >& /*rPattern*/,
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sal_Int64 /*aStart*/)
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{
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::dbtools::throwFeatureNotImplementedSQLException(u"Clob::positionOfClob"_ustr, *this);
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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