X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=src%2Fapi%2FIBamIODevice.h;h=b34e449a04ed966756c8c1bc3cb71a60f7bd970f;hb=9f1ce8c47aeadb6dc1320b52ee671c3341b97935;hp=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391;hpb=1691db866bf895d6b2ad72f204ccb6bc9a35e7e3;p=bamtools.git

diff --git a/src/api/IBamIODevice.h b/src/api/IBamIODevice.h
index e69de29..b34e449 100644
--- a/src/api/IBamIODevice.h
+++ b/src/api/IBamIODevice.h
@@ -0,0 +1,94 @@
+// ***************************************************************************
+// IBamIODevice.h (c) 2011 Derek Barnett
+// Marth Lab, Department of Biology, Boston College
+// ---------------------------------------------------------------------------
+// Last modified: 10 October 2011 (DB)
+// ---------------------------------------------------------------------------
+// Base class for all BAM I/O devices (e.g. local file, pipe, HTTP, FTP, etc.)
+//
+// Derived classes should provide protocol-specific implementations for
+// reading/writing plain bytes, as well as other I/O-related behaviors.
+//
+// Since IBamIODevices may be defined in client code, the internal
+// BamExceptions are NOT allowed to be thrown from devices, including the
+// built-in ones. This keeps a consistent interface at the BgzfStream for
+// handling any device type. Use the error string for relaying error messages.
+// ***************************************************************************
+
+#ifndef IBAMIODEVICE_H
+#define IBAMIODEVICE_H
+
+#include "api/api_global.h"
+#include <string>
+
+namespace BamTools {
+
+class API_EXPORT IBamIODevice {
+
+    // enums
+    public: enum OpenMode { NotOpen = 0
+                          , ReadOnly
+                          , WriteOnly
+                          };
+
+    // ctor & dtor
+    public:
+        virtual ~IBamIODevice(void) { }
+
+    // IBamIODevice interface
+    public:
+
+        // pure virtuals
+        virtual void Close(void) =0;
+        virtual bool IsRandomAccess(void) const =0;
+        virtual bool Open(const OpenMode mode) =0;
+        virtual size_t Read(char* data, const unsigned int numBytes) =0;
+        virtual bool Seek(const int64_t& position) =0;
+        virtual int64_t Tell(void) const =0;
+        virtual size_t Write(const char* data, const unsigned int numBytes) =0;
+
+        // default implementation provided
+        virtual std::string GetErrorString(void);
+        virtual bool IsOpen(void) const;
+        virtual OpenMode Mode(void) const;
+
+    // internal methods
+    protected:
+        IBamIODevice(void); // hidden ctor
+        void SetErrorString(const std::string& where, const std::string& what);
+
+    // data members
+    protected:
+        OpenMode    m_mode;
+        std::string m_errorString;
+};
+
+inline
+IBamIODevice::IBamIODevice(void)
+    : m_mode(IBamIODevice::NotOpen)
+{ }
+
+inline
+std::string IBamIODevice::GetErrorString(void) {
+    return m_errorString;
+}
+
+inline
+bool IBamIODevice::IsOpen(void) const {
+    return ( m_mode != IBamIODevice::NotOpen );
+}
+
+inline
+IBamIODevice::OpenMode IBamIODevice::Mode(void) const {
+    return m_mode;
+}
+
+inline
+void IBamIODevice::SetErrorString(const std::string& where, const std::string& what) {
+    static const std::string SEPARATOR = ": ";
+    m_errorString = where + SEPARATOR + what;
+}
+
+} // namespace BamTools
+
+#endif // IBAMIODEVICE_H