Allow building a configuration from an option list

include/cppkafka/configuration.h

@@ -33,6 +33,7 @@
 #include <memory>
 #include <string>
 #include <functional>
+#include <initializer_list>
 #include <chrono>
 #include <boost/optional.hpp>
 #include <librdkafka/rdkafka.h>
@@ -82,6 +83,16 @@ public:
      */
     Configuration();
 
+    /**
+     * Constructs a Configuration object using a list of options
+     */
+    Configuration(const std::vector<ConfigurationOption>& options);
+
+    /**
+     * Constructs a Configuration object using a list of options
+     */
+    Configuration(const std::initializer_list<ConfigurationOption>& options);
+
     /**
      * \brief Sets an attribute.
      *
@@ -130,7 +141,7 @@ public:
     /** 
      * Sets the default topic configuration
      */
-    Configuration& set_default_topic_configuration(boost::optional<TopicConfiguration> config);
+    Configuration& set_default_topic_configuration(TopicConfiguration config);
 
     /**
      * Returns true iff the given property name has been set

include/cppkafka/configuration_base.h

@@ -32,7 +32,9 @@
 
 #include <string>
 #include <map>
+#include <vector>
 #include "exceptions.h"
+#include "configuration_option.h"
 
 namespace cppkafka {
 
@@ -65,6 +67,16 @@ public:
         return proxy_set(name, value);
     }
 
+    /**
+     * Sets a list of options
+     */
+    Concrete& set(const std::vector<ConfigurationOption>& options) {
+        for (const auto& option : options) {
+            proxy_set(option.get_key(), option.get_value());
+        }
+        return static_cast<Concrete&>(*this);
+    }
+
     /**
      * \brief Gets a value, converting it to the given type.
      *

include/cppkafka/configuration_option.h

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2016, Matias Fontanini
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following disclaimer
+ *   in the documentation and/or other materials provided with the
+ *   distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef CPPKAFKA_CONFIGURATION_OPTION_H
+#define CPPKAFKA_CONFIGURATION_OPTION_H
+
+#include <string>
+#include <type_traits>
+
+namespace cppkafka {
+
+/**
+ * Wrapper over a configuration (key, value) pair
+ */
+class ConfigurationOption {
+public:
+    /**
+     * Construct using a std::string value
+     */
+    ConfigurationOption(const std::string& key, const std::string& value);
+    
+    /**
+     * Construct using a const char* value
+     */
+    ConfigurationOption(const std::string& key, const char* value);
+    
+    /**
+     * Construct using a bool value
+     */
+    ConfigurationOption(const std::string& key, bool value);
+
+    /**
+     * Construct using any integral value
+     */
+    template <typename T,
+              typename = typename std::enable_if<std::is_integral<T>::value>::type>
+    ConfigurationOption(const std::string& key, T value)
+    : ConfigurationOption(key, std::to_string(value)) {
+
+    }
+
+    /**
+     * Gets the key
+     */
+    const std::string& get_key() const;
+
+    /**
+     * Gets the value
+     */
+    const std::string& get_value() const;
+private:
+    std::string key_;
+    std::string value_;
+};
+
+} // cppkafka
+
+#endif // CPPKAFKA_CONFIGURATION_OPTION_H

include/cppkafka/consumer.h

@@ -54,9 +54,10 @@ class TopicConfiguration;
  *
  * \code
  * // Create a configuration and set the group.id and broker list fields 
- * Configuration config;
- * config.set("metadata.broker.list", "127.0.0.1:9092");
- * config.set("group.id", "foo");
+ * Configuration config = {
+ *     { "metadata.broker.list", "127.0.0.1:9092" },
+ *     { "group.id", "foo" }
+ * };
  *
  * // Create a consumer
  * Consumer consumer(config);

include/cppkafka/producer.h

@@ -57,8 +57,9 @@ class TopicConfiguration;
  *
  * \code
  * // Set the broker list
- * Configuration config;
- * config.set("metadata.broker.list", "127.0.0.1:9092");
+ * Configuration config = {
+ *     { "metadata.broker.list", "127.0.0.1:9092" }
+ * };
  *
  * // Create a producer 
  * Producer producer(config);

include/cppkafka/topic_configuration.h

@@ -32,6 +32,7 @@
 
 #include <string>
 #include <functional>
+#include <initializer_list>
 #include <librdkafka/rdkafka.h>
 #include "clonable_ptr.h"
 #include "configuration_base.h"
@@ -71,6 +72,16 @@ public:
      */
     TopicConfiguration();
 
+    /**
+     * Constructs a TopicConfiguration object using a list of options
+     */
+    TopicConfiguration(const std::vector<ConfigurationOption>& options);
+
+    /**
+     * Constructs a TopicConfiguration object using a list of options
+     */
+    TopicConfiguration(const std::initializer_list<ConfigurationOption>& options);
+
     /**
      * Sets an option
      *