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diff --git a/src/lib/dns/rdata/generic/ns_2.cc b/src/lib/dns/rdata/generic/ns_2.cc
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+// Copyright (C) 2010-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#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 NS 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 NSDNAME 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.
+NS::NS(const std::string& namestr) :
+ // Fill in dummy name and replace them soon below.
+ nsname_(Name::ROOT_NAME())
+{
+ try {
+ std::istringstream ss(namestr);
+ MasterLexer lexer;
+ lexer.pushSource(ss);
+
+ nsname_ = createNameFromLexer(lexer, NULL);
+
+ if (lexer.getNextToken().getType() != MasterToken::END_OF_FILE) {
+ isc_throw(InvalidRdataText, "extra input text for NS: "
+ << namestr);
+ }
+ } catch (const MasterLexer::LexerError& ex) {
+ isc_throw(InvalidRdataText, "Failed to construct NS from '" <<
+ namestr << "': " << ex.what());
+ }
+}
+
+NS::NS(InputBuffer& buffer, size_t) :
+ nsname_(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 an NS RDATA. The NSDNAME 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 NSDNAME when it
+/// is non-absolute.
+NS::NS(MasterLexer& lexer, const Name* origin,
+ MasterLoader::Options, MasterLoaderCallbacks&) :
+ nsname_(createNameFromLexer(lexer, origin))
+{}
+
+NS::NS(const NS& other) :
+ Rdata(), nsname_(other.nsname_)
+{}
+
+void
+NS::toWire(OutputBuffer& buffer) const {
+ nsname_.toWire(buffer);
+}
+
+void
+NS::toWire(AbstractMessageRenderer& renderer) const {
+ renderer.writeName(nsname_);
+}
+
+string
+NS::toText() const {
+ return (nsname_.toText());
+}
+
+int
+NS::compare(const Rdata& other) const {
+ const NS& other_ns = dynamic_cast<const NS&>(other);
+
+ return (compareNames(nsname_, other_ns.nsname_));
+}
+
+const Name&
+NS::getNSName() const {
+ return (nsname_);
+}
+
+// END_RDATA_NAMESPACE
+// END_ISC_NAMESPACE