[2218] Implement TreeNodeRRset::getRRsig()

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

@@ -578,7 +578,6 @@ TEST_F(TreeNodeRRsetTest, unexpectedMethods) {
     EXPECT_THROW(rrset.setName(Name("example")), isc::Unexpected);
     EXPECT_THROW(rrset.addRdata(createRdata(RRType::A(), rrclass_, "0.0.0.0")),
                  isc::Unexpected);
-    EXPECT_THROW(rrset.getRRsig(), isc::Unexpected);
     RdataPtr sig_rdata = createRdata(
         RRType::RRSIG(), rrclass_,
         "A 5 2 3600 20120814220826 20120715220826 5300 example.com. FAKE");

src/lib/datasrc/memory/treenode_rrset.cc

@@ -97,17 +97,7 @@ TreeNodeRRset::toText() const {
     }
 
     // Dump any RRSIGs
-    tmp_rrset.reset();
-    for (RdataIteratorPtr rit = getSigRdataIterator();
-         !rit->isLast();
-         rit->next())
-    {
-        if (!tmp_rrset) {
-            tmp_rrset = RRsetPtr(new RRset(getName(), rrclass_,
-                                           RRType::RRSIG(), getTTL()));
-        }
-        tmp_rrset->addRdata(rit->getCurrent());
-    }
+    tmp_rrset = getRRsig();
     if (tmp_rrset) {
         ret += tmp_rrset->toText();
     }
@@ -288,7 +278,19 @@ TreeNodeRRset::getSigRdataIterator() const {
 
 RRsetPtr
 TreeNodeRRset::getRRsig() const {
-    isc_throw(Unexpected, "unexpected method called on TreeNodeRRset");
+    RRsetPtr tmp_rrset;
+    for (RdataIteratorPtr rit = getSigRdataIterator();
+         !rit->isLast();
+         rit->next())
+    {
+        if (!tmp_rrset) {
+            tmp_rrset = RRsetPtr(new RRset(getName(), rrclass_,
+                                           RRType::RRSIG(), getTTL()));
+        }
+        tmp_rrset->addRdata(rit->getCurrent());
+    }
+
+    return (tmp_rrset);
 }
 
 void