Author: aconway
Date: Mon Jul 30 14:22:21 2007
New Revision: 561128
URL: http://svn.apache.org/viewvc?view=rev&rev=561128
Log:
Template visitor pattern for Handlers.
Added:
incubator/qpid/trunk/qpid/cpp/src/qpid/framing/Visitor.h (with props)
incubator/qpid/trunk/qpid/cpp/src/tests/Visitor.cpp (with props)
Modified:
incubator/qpid/trunk/qpid/cpp/src/tests/Makefile.am
Added: incubator/qpid/trunk/qpid/cpp/src/qpid/framing/Visitor.h
URL:
http://svn.apache.org/viewvc/incubator/qpid/trunk/qpid/cpp/src/qpid/framing/Visitor.h?view=auto&rev=561128
==============================================================================
--- incubator/qpid/trunk/qpid/cpp/src/qpid/framing/Visitor.h (added)
+++ incubator/qpid/trunk/qpid/cpp/src/qpid/framing/Visitor.h Mon Jul 30
14:22:21 2007
@@ -0,0 +1,71 @@
+#ifndef QPID_FRAMING_VISITOR_H
+#define QPID_FRAMING_VISITOR_H
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+
+#include "Handler.h"
+
+#include <boost/mpl/vector.hpp>
+#include <boost/mpl/inherit.hpp>
+#include <boost/mpl/inherit_linearly.hpp>
+#include <boost/type_traits/add_reference.hpp>
+
+namespace qpid {
+namespace framing {
+
+// FIXME aconway 2007-07-30: Drop linking from handlers, use
+// vector<shared_ptr<Handler<T> > for chains.
+
+/** @file Visitor pattern for Handlers. */
+
+/**
+ * Interface for a handler visitor, inherits Handler<T> for each T in Types
+ [EMAIL PROTECTED] Types A boost::mpl type sequence, e.g. boost::mpl::vector.
+ */
+template <class Types>
+struct HandlerVisitor : public boost::mpl::inherit_linearly<
+ Types, boost::mpl::inherit<boost::mpl::_1, Handler<boost::mpl::_2> >
+ >::type
+{};
+
+/** Base class for hierarchy of objects visitable by Visitor */
+template <class Visitor>
+struct AbstractVisitable {
+ virtual ~AbstractVisitable() {}
+ typedef Visitor VisitorType;
+ virtual void accept(Visitor& v) = 0;
+};
+
+/** Base class for concrete visitable types, implements accept.
+ * @param T parameter type for appropriate Handler, may be a reference.
+ * @param Base base class to inherit from.
+ */
+template <class T, class Base>
+struct ConcreteVisitable : public Base {
+ typedef typename boost::add_reference<T>::type TRef;
+ void accept(typename Base::VisitorType& v) {
+ static_cast<Handler<T>& >(v).handle(static_cast<TRef>(*this));
+ }
+};
+
+}} // namespace qpid::framing
+
+#endif /*!QPID_FRAMING_VISITOR_H*/
Propchange: incubator/qpid/trunk/qpid/cpp/src/qpid/framing/Visitor.h
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Propchange: incubator/qpid/trunk/qpid/cpp/src/qpid/framing/Visitor.h
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svn:keywords = Rev Date
Modified: incubator/qpid/trunk/qpid/cpp/src/tests/Makefile.am
URL:
http://svn.apache.org/viewvc/incubator/qpid/trunk/qpid/cpp/src/tests/Makefile.am?view=diff&rev=561128&r1=561127&r2=561128
==============================================================================
--- incubator/qpid/trunk/qpid/cpp/src/tests/Makefile.am (original)
+++ incubator/qpid/trunk/qpid/cpp/src/tests/Makefile.am Mon Jul 30 14:22:21 2007
@@ -50,6 +50,10 @@
Serializer_SOURCES=Serializer.cpp
Serializer_LDADD=-lboost_unit_test_framework $(lib_common)
+check_PROGRAMS+=Visitor
+Visitor_SOURCES=Visitor.cpp
+Visitor_LDADD=-lboost_unit_test_framework
+
include cluster.mk
# NB: CppUnit test libraries below will be migrated to boost test programs.
Added: incubator/qpid/trunk/qpid/cpp/src/tests/Visitor.cpp
URL:
http://svn.apache.org/viewvc/incubator/qpid/trunk/qpid/cpp/src/tests/Visitor.cpp?view=auto&rev=561128
==============================================================================
--- incubator/qpid/trunk/qpid/cpp/src/tests/Visitor.cpp (added)
+++ incubator/qpid/trunk/qpid/cpp/src/tests/Visitor.cpp Mon Jul 30 14:22:21 2007
@@ -0,0 +1,58 @@
+/*
+ *
+ * Copyright (c) 2006 The Apache Software Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include "qpid/framing/Visitor.h"
+
+#define BOOST_AUTO_TEST_MAIN // Must come before #include<boost/test/*>
+#include <boost/test/auto_unit_test.hpp>
+#include <boost/tuple/tuple.hpp>
+
+using namespace std;
+using namespace qpid::framing;
+
+struct DummyA;
+struct DummyB;
+struct DummyC;
+
+typedef HandlerVisitor<boost::mpl::vector<DummyA&, DummyB&, DummyC&> >
DummyVisitor;
+
+struct DummyFrame : public AbstractVisitable<DummyVisitor> {};
+
+struct DummyA : public ConcreteVisitable<DummyA&, DummyFrame> {};
+struct DummyB : public ConcreteVisitable<DummyB&, DummyFrame> {};
+struct DummyC : public ConcreteVisitable<DummyC&, DummyFrame> {};
+
+struct TestDummyVisitor : public DummyVisitor {
+ boost::tuple<DummyA*, DummyB*, DummyC*> dummies;
+ void handle(DummyA& a) { dummies.get<0>() = &a; }
+ void handle(DummyB& b) { dummies.get<1>() = &b; }
+ void handle(DummyC& c) { dummies.get<2>() = &c; }
+};
+
+BOOST_AUTO_TEST_CASE(Visitor_accept) {
+ TestDummyVisitor v;
+ DummyA a;
+ DummyB b;
+ DummyC c;
+ a.accept(v);
+ BOOST_CHECK_EQUAL(&a, v.dummies.get<0>());
+ b.accept(v);
+ BOOST_CHECK_EQUAL(&b, v.dummies.get<1>());
+ c.accept(v);
+ BOOST_CHECK_EQUAL(&c, v.dummies.get<2>());
+}
Propchange: incubator/qpid/trunk/qpid/cpp/src/tests/Visitor.cpp
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