IOAccessor.cc

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/*
 * IOAccessor.cc
 *
 * Smalltalk like class library for C++
 * Abstract accessor to I/O resource.
 *
 * Copyright (c) 2003 Milan Cermak
 */
/*
 * 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; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <stlib/IOAccessor.h>

#include <stlib/ByteArray.h>
#include <stlib/ExternalEncodedStreamFactory.h>
#include <stlib/ExternalReadStream.h>
#include <stlib/ExternalReadAppendStream.h>
#include <stlib/ExternalWriteStream.h>
#include <stlib/SequenceableCollection.h>
#include <stlib/String.h>

/* Class-accessing protocol */
String *IOAccessor::className(void) const
{
    return new String("IOAccessor");
}

/* Accessing protocol */
long IOAccessor::bufferSize(void)
{
    return 4096;
}

void IOAccessor::commit(void)
{
    /* Does nothing */
}

long IOAccessor::dataSize(void)
{
    return 0;
}

LineEndConvention IOAccessor::lineEndConvention(void)
{
    return LineEndTransparent;
}

/* Data transfer protocol */
int IOAccessor::readInto(ByteArray *buffer)
{
    return readInto(buffer, 0, buffer->size());
}

int IOAccessor::writeFrom(ByteArray *buffer)
{
    return writeFrom(buffer, 0, buffer->size());
}

int IOAccessor::writeForSureFrom(ByteArray *buffer, long startIndex, long count)
{
    long start = startIndex;
    long total = 0;
    long result;

    while (total < count) {
        result = writeFrom(buffer, start, count - total);
        start += result;
        total += result;
    }
    return total;
}

/* Synchronization protocol */
void IOAccessor::readWait(void)
{
    /* Does nothing */
}

void IOAccessor::writeWait(void)
{
    /* Does nothing */
}

/* Stream creation protocol */
ExternalReadStream *IOAccessor::readStream(void)
{
    return new ExternalReadStream(this);
}

ExternalReadAppendStream *IOAccessor::readAppendStream(void)
{
    return new ExternalReadAppendStream(this);
}

ExternalWriteStream *IOAccessor::writeStream(void)
{
    return new ExternalWriteStream(this);
}

ExternalEncodedStreamFactory *IOAccessor::withEncoding(String *encoding)
{
    return new ExternalEncodedStreamFactory(this, encoding);
}

ExternalEncodedStreamFactory *IOAccessor::withEncoding(const char *encoding)
{
    return withEncoding(new String(encoding));
}

/* Stream redirection protocol */
void IOAccessor::changeDescriptorTo(int fd)
{
    shouldNotImplement(__PRETTY_FUNCTION__);
}

/* Testing protocol */
bool IOAccessor::isSeekable(void)
{
    return false;
}

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