EncodedStream.cc

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/*
 * EncodedStream.cc
 *
 * Smalltalk like class library for C++
 * Stream with encoding translation capability.
 *
 * Copyright (c) 2004-6 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/EncodedStream.h>
#include <stlib/ByteArray.h>
#include <stlib/Character.h>
#include <stlib/InternalEncodedStreamFactory.h>
#include <stlib/StreamEncoder.h>
#include <stlib/String.h>

#include <stlib/Error.h>

namespace Core {

EncodedStream::EncodedStream(Stream *stream, StreamEncoder *encoder)
  : StreamDecorator(stream)
{
    this->encoder = encoder;
    _replacement = nil;
}

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

/* Instance creation protocol */
EncodedStream *EncodedStream::on(String *encoding, Stream *stream)
{
    InternalEncodedStreamFactory *factory = new InternalEncodedStreamFactory(new ByteArray, encoding);
    return new EncodedStream(stream, factory->getEncoder());
}

/* Initialize protocol */
void EncodedStream::replacementCharacter(Character *ch)
{
    _replacement = ch;
}

void EncodedStream::bigEndian(void)
{
    encoder->bigEndian();
}

void EncodedStream::littleEndian(void)
{
    encoder->littleEndian();
}

/* Accessing protocol */
Object *EncodedStream::next(void)
{
    try {
        return encoder->decodeFrom(underlying_stream);
    }
    catch (Error *ex) {
        if (_replacement == nil) ex->pass();
        return _replacement;
    }
}

void EncodedStream::nextPut(Object *object)
{
    try {
        encoder->encodeTo(underlying_stream, dynamic_cast<Character *>(object));
    }
    catch (Error *ex) {
        if (_replacement == nil)
            ex->pass();
        else
            encoder->encodeTo(underlying_stream, _replacement);
    }
}

/* Testing protocol */
bool EncodedStream::isBinary(void)
{
    return false;
}

/* Private protocol */
SequenceableCollection *EncodedStream::contentSpeciesFor(long items)
{
    return new String(items);
}

}; /* namespace Core */

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