[rocketmq-client-cpp] 20/29: refactor: MessageSelector

[if...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

ifplusor pushed a commit to branch re_dev
in repository https://gitbox.apache.org/repos/asf/rocketmq-client-cpp.git

commit 99b18ab1ef4b70808b56befc0efcc914a0b21c16
Author: James Yin <yw...@hotmail.com>
AuthorDate: Mon Sep 21 15:46:05 2020 +0800

    refactor: MessageSelector
---
 include/MessageSelector.h | 58 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/include/MessageSelector.h b/include/MessageSelector.h
new file mode 100644
index 0000000..4e33acd
--- /dev/null
+++ b/include/MessageSelector.h
@@ -0,0 +1,58 @@
+/*
+ * 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.
+ */
+#ifndef ROCKETMQ_MESSAGESELECTOR_H_
+#define ROCKETMQ_MESSAGESELECTOR_H_
+
+#include <algorithm>  // std::move
+
+#include "ExpressionType.h"
+
+namespace rocketmq {
+
+class ROCKETMQCLIENT_API MessageSelector {
+ private:
+  MessageSelector(const std::string& type, const std::string& expression) : type_(type), expression_(expression) {}
+
+ public:
+  virtual ~MessageSelector() = default;
+
+  MessageSelector(const MessageSelector& other) : type_(other.type_), expression_(other.expression_) {}
+  MessageSelector(MessageSelector&& other) : type_(std::move(other.type_)), expression_(std::move(other.expression_)) {}
+
+  MessageSelector& operator=(const MessageSelector& other) {
+    if (this != &other) {
+      type_ = other.type_;
+      expression_ = other.expression_;
+    }
+    return *this;
+  }
+
+  static inline MessageSelector bySql(const std::string& sql) { return MessageSelector(ExpressionType::SQL92, sql); }
+  static inline MessageSelector byTag(const std::string& tag) { return MessageSelector(ExpressionType::TAG, tag); }
+
+ public:
+  const std::string& type() const { return type_; }
+  const std::string& expression() const { return expression_; }
+
+ private:
+  std::string type_;
+  std::string expression_;
+};
+
+}  // namespace rocketmq
+
+#endif  // ROCKETMQ_MESSAGESELECTOR_H_