added devnull cache adapter

devnulladapter.cpp

@@ -0,0 +1,38 @@
+#include "devnulladapter.hpp"
+
+using namespace Bidstack::Cache;
+
+DevNullAdapter::DevNullAdapter(QObject *parent) : AbstractAdapter(parent) {
+
+}
+
+bool DevNullAdapter::store(QString key, QString data) {
+    Q_UNUSED(key);
+    Q_UNUSED(data);
+    return true;
+}
+
+bool DevNullAdapter::has(QString key) {
+    Q_UNUSED(key);
+    return false;
+}
+
+bool DevNullAdapter::remove(QString key) {
+    Q_UNUSED(key);
+    return true;
+}
+
+bool DevNullAdapter::clear() {
+    return true;
+}
+
+QString DevNullAdapter::fetch(QString key) {
+    Q_UNUSED(key);
+    return "";
+}
+
+QString DevNullAdapter::fetch(QString key, QString defaultValue) {
+    Q_UNUSED(key);
+    Q_UNUSED(defaultValue);
+    return defaultValue;
+}

devnulladapter.hpp

@@ -0,0 +1,29 @@
+#ifndef BIDSTACK_CACHE_DEVNULLADAPTER_HPP
+#define BIDSTACK_CACHE_DEVNULLADAPTER_HPP
+
+#include <QObject>
+
+#include "abstractadapter.hpp"
+
+namespace Bidstack {
+    namespace Cache {
+
+        class DevNullAdapter : public AbstractAdapter {
+            Q_OBJECT
+
+        public:
+            DevNullAdapter(QObject *parent = 0);
+
+        public:
+            bool store(QString key, QString data);
+            bool has(QString key);
+            bool remove(QString key);
+            bool clear();
+            QString fetch(QString key);
+            QString fetch(QString key, QString defaultValue);
+        };
+
+    };
+};
+
+#endif