Bring in backends from the dead branch

modules/ripple_app/node/ripple_HashedObject.h

@@ -0,0 +1,88 @@
+//------------------------------------------------------------------------------
+/*
+    Copyright (c) 2011-2013, OpenCoin, Inc.
+*/
+//==============================================================================
+
+#ifndef RIPPLE_HASHEDOBJECT_H
+#define RIPPLE_HASHEDOBJECT_H
+
+/** The types of hashed objects.
+*/
+enum HashedObjectType
+{
+    hotUNKNOWN = 0,
+    hotLEDGER = 1,
+    hotTRANSACTION = 2,
+    hotACCOUNT_NODE = 3,
+    hotTRANSACTION_NODE = 4
+};
+
+/** A blob of data with associated metadata, referenced by hash.
+
+    The metadata includes the following:
+
+    - Type of the blob
+    - The ledger index in which it appears
+    - The SHA 256 hash
+
+    @note No checking is performed to make sure the hash matches the data.
+    @see SHAMap
+*/
+// VFALCO TODO consider making the instance a private member of SHAMap
+//         since its the primary user.
+//
+class HashedObject
+    : public CountedObject <HashedObject>
+{
+public:
+    static char const* getCountedObjectName () { return "HashedObject"; }
+
+    typedef boost::shared_ptr <HashedObject> pointer;
+    typedef pointer const& ref;
+
+    /** Create from a vector of data.
+
+        @note A copy of the data is created.
+    */
+    HashedObject (HashedObjectType type,
+                  LedgerIndex ledgerIndex,
+                  Blob const & binaryDataToCopy,
+                  uint256 const & hash);
+
+    /** Create from an area of memory.
+
+        @note A copy of the data is created.
+    */
+    HashedObject (HashedObjectType type,
+                  LedgerIndex ledgerIndex,
+                  void const * bufferToCopy,
+                  int bytesInBuffer,
+                  uint256 const & hash);
+
+    /** Retrieve the type of this object.
+    */
+    HashedObjectType getType () const;
+
+    /** Retrieve the hash metadata.
+    */
+    uint256 const& getHash () const;
+
+    /** Retrieve the ledger index in which this object appears.
+    */
+    // VFALCO TODO rename to getLedgerIndex or getLedgerId
+    LedgerIndex getIndex () const;
+
+    /** Retrieve the binary data.
+    */
+    Blob const& getData () const;
+
+private:
+    HashedObjectType const mType;
+    uint256 const mHash;
+    LedgerIndex const mLedgerIndex;
+    Blob const mData;
+};
+
+#endif
+// vim:ts=4