From b575e72093666a2db570ba2de4c1f48727935ba1 Mon Sep 17 00:00:00 2001
From: JoelKatz <DavidJoelSchwartz@GMail.com>
Date: Wed, 25 Jul 2012 18:40:08 -0700
Subject: [PATCH] Metadata structures for deletion of unfunded offers.

---
 src/TransactionMeta.cpp | 18 ++++++++++++++++++
 src/TransactionMeta.h   | 11 +++++++++++
 2 files changed, 29 insertions(+)

diff --git a/src/TransactionMeta.cpp b/src/TransactionMeta.cpp
index 40af484b2b..fac9798f26 100644
--- a/src/TransactionMeta.cpp
+++ b/src/TransactionMeta.cpp
@@ -89,6 +89,22 @@ Json::Value TMNEBalance::getJson(int p) const
 	return ret;
 }
 
+void TMNEUnfunded::addRaw(Serializer& sit) const
+{
+	sit.add8(mType);
+}
+
+Json::Value TMNEUnfunded::getJson(int) const
+{
+	return Json::Value("delete_unfunded");
+}
+
+int TMNEUnfunded::compare(const TransactionMetaNodeEntry&) const
+{
+	assert(false); // Can't be two deletes for same node
+	return 0;
+}
+
 TransactionMetaNode::TransactionMetaNode(const uint256& node, SerializerIterator& sit) : mNode(node)
 {
 	mNode = sit.get256();
@@ -100,6 +116,8 @@ TransactionMetaNode::TransactionMetaNode(const uint256& node, SerializerIterator
 		type = sit.get8();
 		if (type == TransactionMetaNodeEntry::TMNChangedBalance)
 			mEntries.insert(boost::shared_ptr<TransactionMetaNodeEntry>(new TMNEBalance(sit)));
+		if (type == TransactionMetaNodeEntry::TMNDeleteUnfunded)
+			mEntries.insert(boost::shared_ptr<TransactionMetaNodeEntry>(new TMNEUnfunded()));
 		else if (type != TransactionMetaNodeEntry::TMNEndOfMetadata)
 			throw std::runtime_error("Unparseable metadata");
 	} while (type != TransactionMetaNodeEntry::TMNEndOfMetadata);
diff --git a/src/TransactionMeta.h b/src/TransactionMeta.h
index c87ed0bb82..5dc4ecccc4 100644
--- a/src/TransactionMeta.h
+++ b/src/TransactionMeta.h
@@ -21,6 +21,7 @@ public:
 
 	static const int TMNEndOfMetadata =	0;
 	static const int TMNChangedBalance = 1;
+	static const int TMNDeleteUnfunded = 2;
 
 	int mType;
 	TransactionMetaNodeEntry(int type) : mType(type) { ; }
@@ -68,6 +69,15 @@ public:
 	virtual int compare(const TransactionMetaNodeEntry&) const;
 };
 
+class TMNEUnfunded : public TransactionMetaNodeEntry
+{ // node was deleted because it was unfunded
+public:
+	TMNEUnfunded() : TransactionMetaNodeEntry(TMNDeleteUnfunded) { ; }
+	virtual void addRaw(Serializer&) const;
+	virtual Json::Value getJson(int) const;
+	virtual int compare(const TransactionMetaNodeEntry&) const;
+};
+
 class TransactionMetaNode
 { // a node that has been affected by a transaction
 public:
@@ -118,6 +128,7 @@ public:
 
 	void threadNode(const uint256& node, const uint256& previousTransaction, uint32 previousLedger);
 	bool signedBy(const uint256& node, const STAmount& fee);
+	bool deleteUnfunded(const uint256& node);
 	bool adjustBalance(const uint256& node, unsigned flags, const STAmount &amount);
 	bool adjustBalances(const uint256& node, unsigned flags, const STAmount &firstAmt, const STAmount &secondAmt);
 };