[1397] Add missing TreeNodeRRset::addRdata() implementation for new interface

src/lib/datasrc/memory/treenode_rrset.cc

@@ -195,6 +195,11 @@ TreeNodeRRset::addRdata(const rdata::Rdata&) {
     isc_throw(Unexpected, "unexpected method called on TreeNodeRRset");
 }
 
+void
+TreeNodeRRset::addRdata(const std::string&) {
+    isc_throw(Unexpected, "unexpected method called on TreeNodeRRset");
+}
+
 namespace {
 // In this namespace we define a set of helper stuff to implement the
 // RdataIterator for the TreeNodeRRset.  We should eventually optimize

src/lib/datasrc/memory/treenode_rrset.h

@@ -204,6 +204,11 @@ public:
     /// It throws \c isc::Unexpected unconditionally.
     virtual void addRdata(const dns::rdata::Rdata& rdata);
 
+    /// \brief Specialized version of \c addRdata() for \c TreeNodeRRset.
+    ///
+    /// It throws \c isc::Unexpected unconditionally.
+    virtual void addRdata(const std::string& rdata_str);
+
     virtual dns::RdataIteratorPtr getRdataIterator() const;
 
     /// \brief Specialized version of \c getRRsig() for \c TreeNodeRRset.

src/lib/datasrc/tests/memory/treenode_rrset_unittest.cc

@@ -663,6 +663,7 @@ TEST_F(TreeNodeRRsetTest, unexpectedMethods) {
     EXPECT_THROW(rrset.setTTL(RRTTL(0)), isc::Unexpected);
     EXPECT_THROW(rrset.addRdata(createRdata(RRType::A(), rrclass_, "0.0.0.0")),
                  isc::Unexpected);
+    EXPECT_THROW(rrset.addRdata("0.0.0.0"), isc::Unexpected);
     RdataPtr sig_rdata = createRdata(
         RRType::RRSIG(), rrclass_,
         "A 5 2 3600 20120814220826 20120715220826 5300 example.com. FAKE");