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diff --git a/src/lib/dns/rdata/generic/ptr_12.cc b/src/lib/dns/rdata/generic/ptr_12.cc
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+++ b/src/lib/dns/rdata/generic/ptr_12.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 PTR 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 PTRDNAME 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.
+PTR::PTR(const std::string& type_str) :
+    // Fill in dummy name and replace them soon below.
+    ptr_name_(Name::ROOT_NAME())
+{
+    try {
+        std::istringstream ss(type_str);
+        MasterLexer lexer;
+        lexer.pushSource(ss);
+
+        ptr_name_ = createNameFromLexer(lexer, NULL);
+
+        if (lexer.getNextToken().getType() != MasterToken::END_OF_FILE) {
+            isc_throw(InvalidRdataText, "extra input text for PTR: "
+                      << type_str);
+        }
+    } catch (const MasterLexer::LexerError& ex) {
+        isc_throw(InvalidRdataText, "Failed to construct PTR from '" <<
+                  type_str << "': " << ex.what());
+    }
+}
+
+PTR::PTR(InputBuffer& buffer, size_t) :
+    ptr_name_(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 PTR RDATA.  The PTRDNAME 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 PTRDNAME when it
+/// is non-absolute.
+PTR::PTR(MasterLexer& lexer, const Name* origin,
+         MasterLoader::Options, MasterLoaderCallbacks&) :
+    ptr_name_(createNameFromLexer(lexer, origin))
+{}
+
+PTR::PTR(const PTR& source) :
+    Rdata(), ptr_name_(source.ptr_name_)
+{}
+
+std::string
+PTR::toText() const {
+    return (ptr_name_.toText());
+}
+
+void
+PTR::toWire(OutputBuffer& buffer) const {
+    ptr_name_.toWire(buffer);
+}
+
+void
+PTR::toWire(AbstractMessageRenderer& renderer) const {
+    renderer.writeName(ptr_name_);
+}
+
+int
+PTR::compare(const Rdata& other) const {
+    // The compare method normally begins with this dynamic cast.
+    const PTR& other_ptr = dynamic_cast<const PTR&>(other);
+
+    return (compareNames(ptr_name_, other_ptr.ptr_name_));
+
+}
+
+const Name&
+PTR::getPTRName() const {
+    return (ptr_name_);
+}
+
+// END_RDATA_NAMESPACE
+// END_ISC_NAMESPACE