constified lib/cc API as much as possible. (trac #310)

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac310@2748 e5f2f494-b856-4b98-b285-d166d9295462

src/bin/auth/auth_srv.cc

@@ -68,7 +68,7 @@ private:
 public:
     AuthSrvImpl(const bool use_cache, AbstractXfroutClient& xfrout_client);
     ~AuthSrvImpl();
-    isc::data::ElementPtr setDbFile(const isc::data::ElementPtr config);
+    isc::data::ConstElementPtr setDbFile(isc::data::ConstElementPtr config);
 
     bool processNormalQuery(const IOMessage& io_message, Message& message,
                             MessageRenderer& response_renderer);
@@ -426,7 +426,7 @@ AuthSrvImpl::processNotify(const IOMessage& io_message, Message& message,
     static const string command_template_end = "\"}]}";
 
     try {
-        ElementPtr notify_command = Element::fromJSON(
+        ConstElementPtr notify_command = Element::fromJSON(
                 command_template_start + question->getName().toText() + 
                 command_template_master + remote_ip_address +
                 command_template_rrclass + question->getClass().toText() +
@@ -434,7 +434,7 @@ AuthSrvImpl::processNotify(const IOMessage& io_message, Message& message,
         const unsigned int seq =
             xfrin_session_->group_sendmsg(notify_command, "Zonemgr",
                                           "*", "*");
-        ElementPtr env, answer, parsed_answer;
+        ConstElementPtr env, answer, parsed_answer;
         xfrin_session_->group_recvmsg(env, answer, false, seq);
         int rcode;
         parsed_answer = parseAnswer(rcode, answer);
@@ -459,19 +459,17 @@ AuthSrvImpl::processNotify(const IOMessage& io_message, Message& message,
     return (true);
 }
 
-ElementPtr
-AuthSrvImpl::setDbFile(const isc::data::ElementPtr config) {
-    ElementPtr answer = isc::config::createAnswer();
-    ElementPtr final;
+ConstElementPtr
+AuthSrvImpl::setDbFile(ConstElementPtr config) {
+    ConstElementPtr answer = isc::config::createAnswer();
 
     if (config && config->contains("database_file")) {
         db_file_ = config->get("database_file")->stringValue();
-        final = config;
     } else if (config_session_ != NULL) {
         bool is_default;
         string item("database_file");
-        ElementPtr value = config_session_->getValue(is_default, item);
-        final = Element::createMap();
+        ConstElementPtr value = config_session_->getValue(is_default, item);
+        ElementPtr final = Element::createMap();
 
         // If the value is the default, and we are running from
         // a specific directory ('from build'), we need to use
@@ -485,6 +483,7 @@ AuthSrvImpl::setDbFile(const isc::data::ElementPtr config) {
                                     "/bind10_zones.sqlite3");
         }
         final->set(item, value);
+        config = final;
 
         db_file_ = value->stringValue();
     } else {
@@ -501,7 +500,7 @@ AuthSrvImpl::setDbFile(const isc::data::ElementPtr config) {
     // fail, while acquiring resources in the RAII manner.  We then perform
     // delete and swap operations which should not fail.
     DataSrcPtr datasrc_ptr(DataSrcPtr(new Sqlite3DataSrc));
-    datasrc_ptr->init(final);
+    datasrc_ptr->init(config);
     data_sources_.addDataSrc(datasrc_ptr);
 
     // The following code should be exception free.
@@ -513,15 +512,12 @@ AuthSrvImpl::setDbFile(const isc::data::ElementPtr config) {
     return (answer);
 }
 
-ElementPtr
-AuthSrv::updateConfig(isc::data::ElementPtr new_config) {
+ConstElementPtr
+AuthSrv::updateConfig(ConstElementPtr new_config) {
     try {
         // the ModuleCCSession has already checked if we have
         // the correct ElementPtr type as specified in our .spec file
-        ElementPtr answer = isc::config::createAnswer();
-        answer = impl_->setDbFile(new_config);
-
-        return (answer);
+        return (impl_->setDbFile(new_config));
     } catch (const isc::Exception& error) {
         if (impl_->verbose_mode_) {
             cerr << "[b10-auth] error: " << error.what() << endl;

src/bin/auth/auth_srv.h

@@ -69,7 +69,7 @@ public:
                         isc::dns::MessageRenderer& response_renderer);
     void setVerbose(bool on);
     bool getVerbose() const;
-    isc::data::ElementPtr updateConfig(isc::data::ElementPtr config);
+    isc::data::ConstElementPtr updateConfig(isc::data::ConstElementPtr config);
     isc::config::ModuleCCSession* configSession() const;
     void setConfigSession(isc::config::ModuleCCSession* config_session);
 

src/bin/auth/main.cc

@@ -66,19 +66,19 @@ AuthSrv *auth_server;
 
 asio_link::IOService* io_service;
 
-ElementPtr
-my_config_handler(ElementPtr new_config) {
+ConstElementPtr
+my_config_handler(ConstElementPtr new_config) {
     return (auth_server->updateConfig(new_config));
 }
 
-ElementPtr
-my_command_handler(const string& command, const ElementPtr args) {
-    ElementPtr answer = createAnswer();
+ConstElementPtr
+my_command_handler(const string& command, ConstElementPtr args) {
+    ConstElementPtr answer = createAnswer();
 
     if (command == "print_message") {
         cout << args << endl;
         /* let's add that message to our answer as well */
-        answer->get("result")->add(args);
+        answer = createAnswer(0, args);
     } else if (command == "shutdown") {
         io_service->stop();
     }

src/bin/auth/tests/auth_srv_unittest.cc

@@ -85,24 +85,25 @@ private:
         {}
         virtual void establish(const char* socket_file);
         virtual void disconnect();
-        virtual int group_sendmsg(ElementPtr msg, string group,
+        virtual int group_sendmsg(ConstElementPtr msg, string group,
                                   string instance, string to);
-        virtual bool group_recvmsg(ElementPtr& envelope, ElementPtr& msg,
+        virtual bool group_recvmsg(ConstElementPtr& envelope,
+                                   ConstElementPtr& msg,
                                    bool nonblock, int seq);
         virtual void subscribe(string group, string instance);
         virtual void unsubscribe(string group, string instance);
         virtual void startRead(boost::function<void()> read_callback);
-        virtual int reply(ElementPtr& envelope, ElementPtr& newmsg);
-        virtual bool hasQueuedMsgs();
+        virtual int reply(ConstElementPtr envelope, ConstElementPtr newmsg);
+        virtual bool hasQueuedMsgs() const;
 
-        void setMessage(ElementPtr msg) { msg_ = msg; }
+        void setMessage(ConstElementPtr msg) { msg_ = msg; }
         void disableSend() { send_ok_ = false; }
         void disableReceive() { receive_ok_ = false; }
 
-        ElementPtr sent_msg;
+        ConstElementPtr sent_msg;
         string msg_destination;
     private:
-        ElementPtr msg_;
+        ConstElementPtr msg_;
         bool send_ok_;
         bool receive_ok_;
     };
@@ -172,19 +173,19 @@ AuthSrvTest::MockSession::startRead(
 {}
 
 int
-AuthSrvTest::MockSession::reply(ElementPtr& envelope UNUSED_PARAM,
-                                ElementPtr& newmsg UNUSED_PARAM)
+AuthSrvTest::MockSession::reply(ConstElementPtr envelope UNUSED_PARAM,
+                                ConstElementPtr newmsg UNUSED_PARAM)
 {
     return (-1);
 }
 
 bool
-AuthSrvTest::MockSession::hasQueuedMsgs() {
+AuthSrvTest::MockSession::hasQueuedMsgs() const {
     return (false);
 }
 
 int
-AuthSrvTest::MockSession::group_sendmsg(ElementPtr msg, string group,
+AuthSrvTest::MockSession::group_sendmsg(ConstElementPtr msg, string group,
                                         string instance UNUSED_PARAM,
                                         string to UNUSED_PARAM)
 {
@@ -198,8 +199,8 @@ AuthSrvTest::MockSession::group_sendmsg(ElementPtr msg, string group,
 }
 
 bool
-AuthSrvTest::MockSession::group_recvmsg(ElementPtr& envelope UNUSED_PARAM,
-                                        ElementPtr& msg,
+AuthSrvTest::MockSession::group_recvmsg(ConstElementPtr& envelope UNUSED_PARAM,
+                                        ConstElementPtr& msg,
                                         bool nonblock UNUSED_PARAM,
                                         int seq UNUSED_PARAM)
 {
@@ -537,7 +538,8 @@ TEST_F(AuthSrvTest, notify) {
     EXPECT_EQ("Zonemgr", notify_session.msg_destination);
     EXPECT_EQ("notify",
               notify_session.sent_msg->get("command")->get(0)->stringValue());
-    ElementPtr notify_args = notify_session.sent_msg->get("command")->get(1);
+    ConstElementPtr notify_args =
+        notify_session.sent_msg->get("command")->get(1);
     EXPECT_EQ("example.com.", notify_args->get("zone_name")->stringValue());
     EXPECT_EQ(DEFAULT_REMOTE_ADDRESS,
               notify_args->get("master")->stringValue());
@@ -566,7 +568,8 @@ TEST_F(AuthSrvTest, notifyForCHClass) {
 
     // Other conditions should be the same, so simply confirm the RR class is
     // set correctly.
-    ElementPtr notify_args = notify_session.sent_msg->get("command")->get(1);
+    ConstElementPtr notify_args =
+        notify_session.sent_msg->get("command")->get(1);
     EXPECT_EQ("CH", notify_args->get("zone_class")->stringValue());
 }
 
@@ -694,12 +697,12 @@ void
 updateConfig(AuthSrv* server, const char* const dbfile,
              const bool expect_success)
 {
-    const ElementPtr config_answer =
+    ConstElementPtr config_answer =
         server->updateConfig(Element::fromJSON(dbfile));
     EXPECT_EQ(Element::map, config_answer->getType());
     EXPECT_TRUE(config_answer->contains("result"));
 
-    const ElementPtr result = config_answer->get("result");
+    ConstElementPtr result = config_answer->get("result");
     EXPECT_EQ(Element::list, result->getType());
     EXPECT_EQ(expect_success ? 0 : 1, result->get(0)->intValue());
 }

src/lib/cc/data.cc

@@ -20,6 +20,7 @@
 
 #include <cassert>
 #include <climits>
+#include <map>
 #include <cstdio>
 #include <iostream>
 #include <string>
@@ -35,21 +36,21 @@ namespace isc {
 namespace data {
 
 std::string
-Element::str() {
+Element::str() const {
     std::stringstream ss;
     toJSON(ss);
     return (ss.str());
 }
 
 std::string
-Element::toWire() {
+Element::toWire() const {
     std::stringstream ss;
     toJSON(ss);
     return (ss.str());
 }
 
 void
-Element::toWire(std::ostream& ss) {
+Element::toWire(std::ostream& ss) const {
     toJSON(ss);
 }
 
@@ -81,12 +82,12 @@ Element::getValue(std::string& t UNUSED_PARAM) {
 }
 
 bool
-Element::getValue(std::vector<ElementPtr>& t UNUSED_PARAM) {
+Element::getValue(std::vector<ConstElementPtr>& t UNUSED_PARAM) {
     return (false);
 }
 
 bool
-Element::getValue(std::map<std::string, ElementPtr>& t UNUSED_PARAM) {
+Element::getValue(std::map<std::string, ConstElementPtr>& t UNUSED_PARAM) {
     return (false);
 }
 
@@ -111,27 +112,29 @@ Element::setValue(const std::string& v UNUSED_PARAM) {
 }
 
 bool
-Element::setValue(const std::vector<ElementPtr>& v UNUSED_PARAM) {
+Element::setValue(const std::vector<ConstElementPtr>& v UNUSED_PARAM) {
     return (false);
 }
 
 bool
-Element::setValue(const std::map<std::string, ElementPtr>& v UNUSED_PARAM) {
+Element::setValue(const std::map<std::string,
+                  ConstElementPtr>& v UNUSED_PARAM)
+{
     return (false);
 }
 
-ElementPtr
-Element::get(const int i UNUSED_PARAM) {
+ConstElementPtr
+Element::get(const int i UNUSED_PARAM) const {
     isc_throw(TypeError, "get(int) called on a non-list Element");
 }
 
 void
-Element::set(const size_t i UNUSED_PARAM, ElementPtr element UNUSED_PARAM) {
+Element::set(const size_t i UNUSED_PARAM, ConstElementPtr element UNUSED_PARAM) {
     isc_throw(TypeError, "set(int, element) called on a non-list Element");
 }
 
 void
-Element::add(ElementPtr element UNUSED_PARAM) {
+Element::add(ConstElementPtr element UNUSED_PARAM) {
     isc_throw(TypeError, "add() called on a non-list Element");
 }
 
@@ -141,18 +144,18 @@ Element::remove(const int i UNUSED_PARAM) {
 }
 
 size_t
-Element::size() {
+Element::size() const {
     isc_throw(TypeError, "size() called on a non-list Element");
 }
 
-ElementPtr
-Element::get(const std::string& name UNUSED_PARAM) {
+ConstElementPtr
+Element::get(const std::string& name UNUSED_PARAM) const {
     isc_throw(TypeError, "get(string) called on a non-map Element");
 }
 
 void
 Element::set(const std::string& name UNUSED_PARAM,
-             ElementPtr element UNUSED_PARAM)
+             ConstElementPtr element UNUSED_PARAM)
 {
     isc_throw(TypeError, "set(name, element) called on a non-map Element");
 }
@@ -163,18 +166,18 @@ Element::remove(const std::string& name UNUSED_PARAM) {
 }
 
 bool
-Element::contains(const std::string& name UNUSED_PARAM) {
+Element::contains(const std::string& name UNUSED_PARAM) const {
     isc_throw(TypeError, "contains(string) called on a non-map Element");
 }
 
-ElementPtr
-Element::find(const std::string& identifier UNUSED_PARAM) {
+ConstElementPtr
+Element::find(const std::string& identifier UNUSED_PARAM) const {
     isc_throw(TypeError, "find(string) called on a non-map Element");
 }
 
 bool
 Element::find(const std::string& identifier UNUSED_PARAM,
-              ElementPtr& t UNUSED_PARAM)
+              ConstElementPtr t UNUSED_PARAM) const
 {
     return (false);
 }
@@ -189,12 +192,18 @@ throwJSONError(const std::string& error, const std::string& file, int line, int
 }
 }
 
-std::ostream& operator <<(std::ostream &out, const isc::data::ElementPtr& e) {
-    return (out << e->str());
+std::ostream&
+operator<<(std::ostream &out, const Element& e) {
+    return (out << e.str());
 }
 
-bool operator==(const isc::data::ElementPtr a, const isc::data::ElementPtr b) {
-    return (a->equals(b));
+bool
+operator==(const Element& a, const Element& b) {
+    return (a.equals(b));
+}
+
+bool operator!=(const Element& a, const Element& b) {
+    return (!a.equals(b));
 };
 
 //
@@ -428,7 +437,7 @@ from_stringstream_list(std::istream &in, const std::string& file, int& line, int
 {
     char c = 0;
     ElementPtr list = Element::createList();
-    ElementPtr cur_list_element;
+    ConstElementPtr cur_list_element;
 
     skip_chars(in, " \t\n", line, pos);
     while (c != EOF && c != ']') {
@@ -462,7 +471,7 @@ from_stringstream_map(std::istream &in, const std::string& file, int& line,
             in.get();
             pos++;
 
-            ElementPtr value = Element::fromJSON(in, file, line, pos);
+            ConstElementPtr value = Element::fromJSON(in, file, line, pos);
             map->set(key, value);
             
             skip_to(in, file, line, pos, ",}", " \t\n");
@@ -614,20 +623,17 @@ Element::fromJSON(const std::string &in) {
 // to JSON format
 
 void
-IntElement::toJSON(std::ostream& ss)
-{
+IntElement::toJSON(std::ostream& ss) const {
     ss << intValue();
 }
 
 void
-DoubleElement::toJSON(std::ostream& ss)
-{
+DoubleElement::toJSON(std::ostream& ss) const {
     ss << doubleValue();
 }
 
 void
-BoolElement::toJSON(std::ostream& ss)
-{
+BoolElement::toJSON(std::ostream& ss) const {
     if (boolValue()) {
         ss << "true";
     } else {
@@ -636,26 +642,23 @@ BoolElement::toJSON(std::ostream& ss)
 }
 
 void
-NullElement::toJSON(std::ostream& ss)
-{
+NullElement::toJSON(std::ostream& ss) const {
     ss << "null";
 }
 
 void
-StringElement::toJSON(std::ostream& ss)
-{
+StringElement::toJSON(std::ostream& ss) const {
     ss << "\"";
     ss << stringValue();
     ss << "\"";
 }
 
 void
-ListElement::toJSON(std::ostream& ss)
-{
+ListElement::toJSON(std::ostream& ss) const {
     ss << "[ ";
 
-    const std::vector<ElementPtr>& v = listValue();
-    for (std::vector<ElementPtr>::const_iterator it = v.begin();
+    const std::vector<ConstElementPtr>& v = listValue();
+    for (std::vector<ConstElementPtr>::const_iterator it = v.begin();
          it != v.end(); ++it) {
         if (it != v.begin()) {
             ss << ", ";
@@ -666,12 +669,11 @@ ListElement::toJSON(std::ostream& ss)
 }
 
 void
-MapElement::toJSON(std::ostream& ss)
-{
+MapElement::toJSON(std::ostream& ss) const {
     ss << "{ ";
 
-    const std::map<std::string, ElementPtr>& m = mapValue();
-    for (std::map<std::string, ElementPtr>::const_iterator it = m.begin();
+    const std::map<std::string, ConstElementPtr>& m = mapValue();
+    for (std::map<std::string, ConstElementPtr>::const_iterator it = m.begin();
          it != m.end(); ++it) {
         if (it != m.begin()) {
             ss << ", ";
@@ -690,13 +692,13 @@ MapElement::toJSON(std::ostream& ss)
 // we're looking for) is not a MapElement
 // returns 0 if it could simply not be found
 // should that also be an exception?
-ElementPtr
-MapElement::find(const std::string& id) {
+ConstElementPtr
+MapElement::find(const std::string& id) const {
     const size_t sep = id.find('/');
     if (sep == std::string::npos) {
         return (get(id));
     } else {
-        ElementPtr ce = get(id.substr(0, sep));
+        ConstElementPtr ce = get(id.substr(0, sep));
         if (ce) {
             // ignore trailing slash
             if  (sep + 1 != id.size()) {
@@ -735,14 +737,14 @@ Element::fromWire(std::stringstream& in, int length) {
 }
 
 void
-MapElement::set(const std::string& key, ElementPtr value) {
+MapElement::set(const std::string& key, ConstElementPtr value) {
     m[key] = value;
 }
 
 bool
-MapElement::find(const std::string& id, ElementPtr& t) {
+MapElement::find(const std::string& id, ConstElementPtr t) const {
     try {
-        ElementPtr p = find(id);
+        ConstElementPtr p = find(id);
         if (p) {
             t = p;
             return (true);
@@ -754,43 +756,43 @@ MapElement::find(const std::string& id, ElementPtr& t) {
 }
 
 bool
-IntElement::equals(ElementPtr other) {
-    return (other->getType() == Element::integer) &&
-           (i == other->intValue());
+IntElement::equals(const Element& other) const {
+    return (other.getType() == Element::integer) &&
+           (i == other.intValue());
 }
 
 bool
-DoubleElement::equals(ElementPtr other) {
-    return (other->getType() == Element::real) &&
-           (d == other->doubleValue());
+DoubleElement::equals(const Element& other) const {
+    return (other.getType() == Element::real) &&
+           (d == other.doubleValue());
 }
 
 bool
-BoolElement::equals(ElementPtr other) {
-    return (other->getType() == Element::boolean) &&
-           (b == other->boolValue());
+BoolElement::equals(const Element& other) const {
+    return (other.getType() == Element::boolean) &&
+           (b == other.boolValue());
 }
 
 bool
-NullElement::equals(ElementPtr other) {
-    return (other->getType() == Element::null);
+NullElement::equals(const Element& other) const {
+    return (other.getType() == Element::null);
 }
 
 bool
-StringElement::equals(ElementPtr other) {
-    return (other->getType() == Element::string) &&
-           (s == other->stringValue());
+StringElement::equals(const Element& other) const {
+    return (other.getType() == Element::string) &&
+           (s == other.stringValue());
 }
 
 bool
-ListElement::equals(ElementPtr other) {
-    if (other->getType() == Element::list) {
+ListElement::equals(const Element& other) const {
+    if (other.getType() == Element::list) {
         const int s = size();
-        if (s != other->size()) {
+        if (s != other.size()) {
             return (false);
         }
         for (int i = 0; i < s; ++i) {
-            if (!get(i)->equals(other->get(i))) {
+            if (!get(i)->equals(*other.get(i))) {
                 return (false);
             }
         }
@@ -801,13 +803,14 @@ ListElement::equals(ElementPtr other) {
 }
 
 bool
-MapElement::equals(ElementPtr other) {
-    if (other->getType() == Element::map) {
-        std::map<std::string, ElementPtr> m = mapValue();
-        for (std::map<std::string, ElementPtr>::const_iterator it = m.begin();
+MapElement::equals(const Element& other) const {
+    if (other.getType() == Element::map) {
+        const std::map<std::string, ConstElementPtr>& m = mapValue();
+        for (std::map<std::string, ConstElementPtr>::const_iterator it =
+                 m.begin();
              it != m.end() ; ++it) {
-            if (other->contains((*it).first)) {
-                if (!get((*it).first)->equals(other->get((*it).first))) {
+            if (other.contains((*it).first)) {
+                if (!get((*it).first)->equals(*other.get((*it).first))) {
                     return (false);
                 }
             } else {
@@ -819,9 +822,10 @@ MapElement::equals(ElementPtr other) {
         // compare those elements; if one of them is missing we
         // differ (and if it's not missing the loop above has checked
         // it)
-        m = other->mapValue();
-        for (std::map<std::string, ElementPtr>::const_iterator it = m.begin();
-             it != m.end() ; ++it) {
+        std::map<std::string, ConstElementPtr>::const_iterator it;
+        for (it = other.mapValue().begin();
+             it != other.mapValue().end();
+             ++it) {
             if (!contains((*it).first)) {
                 return (false);
             }
@@ -833,12 +837,12 @@ MapElement::equals(ElementPtr other) {
 }
 
 bool
-isNull(ElementPtr p) {
+isNull(ConstElementPtr p) {
     return (!p);
 }
 
 void
-removeIdentical(ElementPtr a, const ElementPtr b) {
+removeIdentical(ElementPtr a, ConstElementPtr b) {
     if (!b) {
         return;
     }
@@ -846,26 +850,50 @@ removeIdentical(ElementPtr a, const ElementPtr b) {
         isc_throw(TypeError, "Non-map Elements passed to removeIdentical");
     }
 
-    std::map<std::string, ElementPtr> m = a->mapValue();
-    for (std::map<std::string, ElementPtr>::const_iterator it = m.begin();
+    const std::map<std::string,