Move base IO class to separate file.

src/XrdFileCache/XrdFileCacheIO.hh

@@ -0,0 +1,45 @@
+#ifndef __XRDFILECACHE_CACHE_IO_HH__
+#define __XRDFILECACHE_CACHE_IO_HH__
+
+#include "XrdFileCache.hh"
+#include "XrdOuc/XrdOucCache.hh"
+#include "XrdCl/XrdClDefaultEnv.hh"
+
+namespace XrdFileCache
+{
+   //----------------------------------------------------------------------------
+   //! Base cache-io class that implements XrdOucCacheIO abstract methods.
+   //----------------------------------------------------------------------------
+   class IO : public XrdOucCacheIO
+   {
+      public:
+         IO (XrdOucCacheIO &io, XrdOucCacheStats &stats, Cache &cache) :
+         m_io(io), m_statsGlobal(stats), m_cache(cache) {}
+
+         //! Original data source.
+         virtual XrdOucCacheIO *Base() { return &m_io; }
+
+         //! Original data source URL.
+         virtual long long FSize() { return m_io.FSize(); }
+
+         //! Original data source URL.
+         virtual const char *Path() { return m_io.Path(); }
+
+         virtual int Sync() { return 0; }
+
+         virtual int Trunc(long long Offset) { errno = ENOTSUP; return -1; }
+
+         virtual int Write(char *Buffer, long long Offset, int Length)
+         { errno = ENOTSUP; return -1; }
+
+
+      protected:
+         XrdCl::Log* clLog() const { return XrdCl::DefaultEnv::GetLog(); }
+
+         XrdOucCacheIO    &m_io;          //!< original data source
+         XrdOucCacheStats &m_statsGlobal; //!< reference to Cache statistics
+         Cache            &m_cache;       //!< reference to Cache needed in detach
+   };
+}
+
+#endif