implement copy instead of taking it from pvDataCPP; implement plugin support

src/copy/pvPlugin.cpp

@@ -0,0 +1,33 @@
+/* pvPlugin.cpp */
+/*
+ * The License for this software can be found in the file LICENSE that is included with the distribution.
+ */
+#include <pv/pvPlugin.h>
+
+using namespace epics::pvData;
+
+namespace epics { namespace pvDatabase{ 
+
+typedef std::map<std::string,PVPluginPtr> PVPluginMap;
+
+static PVPluginMap pluginMap;
+static Mutex mutex;
+
+void PVPluginRegistry::registerPlugin(const std::string & name,const PVPluginPtr & pvPlugin)
+{
+    Lock xx(mutex);
+    PVPluginMap::iterator iter = pluginMap.find(name);
+    if(iter!=pluginMap.end()) throw std::logic_error("plugin already registered");
+    pluginMap.insert(PVPluginMap::value_type(name,pvPlugin));
+}
+
+PVPluginPtr PVPluginRegistry::find(const std::string & name)
+{
+    Lock xx(mutex);
+    PVPluginMap::iterator iter = pluginMap.find(name);
+    if(iter!=pluginMap.end()) return (*iter).second;
+    return PVPluginPtr();
+}
+
+}}
+