// Copyright (C) 2010  Internet Systems Consortium, Inc. ("ISC")
//
// 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 ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS.  IN NO EVENT SHALL ISC 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.

#include <config.h>

#include <string>

#include <util/buffer.h>
#include <dns/name.h>
#include <dns/messagerenderer.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>

#include <dns/rdata/generic/detail/lexer_util.h>

using namespace std;
using namespace isc::util;
using isc::dns::rdata::generic::detail::createNameFromLexer;

// BEGIN_ISC_NAMESPACE
// BEGIN_RDATA_NAMESPACE

/// \brief Constructor from string.
///
/// The given string must represent a valid CNAME RDATA.  There can be extra
/// space characters at the beginning or end of the text (which are simply
/// ignored), but other extra text, including a new line, will make the
/// construction fail with an exception.
///
/// The CNAME must be absolute since there's no parameter that specifies
/// the origin name; if it is not absolute, \c MissingNameOrigin
/// exception will be thrown.  These must not be represented as a quoted
/// string.
///
/// \throw Others Exception from the Name and RRTTL constructors.
/// \throw InvalidRdataText Other general syntax errors.
CNAME::CNAME(const std::string& namestr) :
    // Fill in dummy name and replace it soon below.
    cname_(Name::ROOT_NAME())
{
    try {
        std::istringstream ss(namestr);
        MasterLexer lexer;
        lexer.pushSource(ss);

        cname_ = createNameFromLexer(lexer, NULL);

        if (lexer.getNextToken().getType() != MasterToken::END_OF_FILE) {
            isc_throw(InvalidRdataText, "extra input text for CNAME: "
                      << namestr);
        }
    } catch (const MasterLexer::LexerError& ex) {
        isc_throw(InvalidRdataText, "Failed to construct CNAME from '" <<
                  namestr << "': " << ex.what());
    }
}

CNAME::CNAME(InputBuffer& buffer, size_t) :
    Rdata(), cname_(buffer)
{
    // we don't need rdata_len for parsing.  if necessary, the caller will
    // check consistency.
}

/// \brief Constructor with a context of MasterLexer.
///
/// The \c lexer should point to the beginning of valid textual
/// representation of a CNAME RDATA.  The CNAME field can be
/// non-absolute if \c origin is non-NULL, in which case \c origin is
/// used to make it absolute.  It must not be represented as a quoted
/// string.
///
/// \throw MasterLexer::LexerError General parsing error such as missing field.
/// \throw Other Exceptions from the Name and RRTTL constructors if
/// construction of textual fields as these objects fail.
///
/// \param lexer A \c MasterLexer object parsing a master file for the
/// RDATA to be created
/// \param origin If non NULL, specifies the origin of CNAME when it
/// is non-absolute.
CNAME::CNAME(MasterLexer& lexer, const Name* origin,
             MasterLoader::Options, MasterLoaderCallbacks&) :
    cname_(createNameFromLexer(lexer, origin))
{}

CNAME::CNAME(const CNAME& other) :
    Rdata(), cname_(other.cname_)
{}

CNAME::CNAME(const Name& cname) :
    cname_(cname)
{}

void
CNAME::toWire(OutputBuffer& buffer) const {
    cname_.toWire(buffer);
}

void
CNAME::toWire(AbstractMessageRenderer& renderer) const {
    renderer.writeName(cname_);
}

string
CNAME::toText() const {
    return (cname_.toText());
}

int
CNAME::compare(const Rdata& other) const {
    const CNAME& other_cname = dynamic_cast<const CNAME&>(other);

    return (compareNames(cname_, other_cname.cname_));
}

const Name&
CNAME::getCname() const {
    return (cname_);
}

// END_RDATA_NAMESPACE
// END_ISC_NAMESPACE
