From 5eebca2c7dd7a5c33097a9f050587dcbad24d3a4 Mon Sep 17 00:00:00 2001
From: Mike Hearn <hearn@google.com>
Date: Thu, 11 Apr 2013 18:15:14 +0200
Subject: [PATCH] Wallet: Add some convenience methods for spending unconfirmed
 transactions.

---
 .../java/com/google/bitcoin/core/Wallet.java  | 31 +++++++++++++++++--
 .../com/google/bitcoin/tools/WalletTool.java  |  6 +---
 2 files changed, 30 insertions(+), 7 deletions(-)

diff --git a/core/src/main/java/com/google/bitcoin/core/Wallet.java b/core/src/main/java/com/google/bitcoin/core/Wallet.java
index 4e51a698..0a052092 100644
--- a/core/src/main/java/com/google/bitcoin/core/Wallet.java
+++ b/core/src/main/java/com/google/bitcoin/core/Wallet.java
@@ -295,6 +295,24 @@ public class Wallet implements Serializable, BlockChainListener {
         }
     }
 
+    /**
+     * This coin selector will select any transaction at all, regardless of where it came from or whether it was
+     * confirmed yet.
+     */
+    public static class AllowUnconfirmedCoinSelector extends DefaultCoinSelector {
+        @Override protected boolean shouldSelect(Transaction tx) {
+            return true;
+        }
+
+        private static AllowUnconfirmedCoinSelector instance;
+        public static AllowUnconfirmedCoinSelector get() {
+            // This doesn't have to be thread safe as the object has no state, so discarded duplicates are harmless.
+            if (instance == null)
+                instance = new AllowUnconfirmedCoinSelector();
+            return instance;
+        }
+    }
+
     private transient CoinSelector coinSelector = new DefaultCoinSelector();
 
     // The keyCrypter for the wallet. This specifies the algorithm used for encrypting and decrypting the private keys.
@@ -1403,8 +1421,8 @@ public class Wallet implements Serializable, BlockChainListener {
     }
 
     /**
-     * Removes the given event listener object. Returns true if the listener was removed,
-     * false if that listener was never added.
+     * Removes the given event listener object. Returns true if the listener was removed, false if that listener
+     * was never added.
      */
     public boolean removeEventListener(WalletEventListener listener) {
         return eventListeners.remove(listener);
@@ -3048,6 +3066,15 @@ public class Wallet implements Serializable, BlockChainListener {
         }
     }
 
+    /**
+     * Convenience wrapper for <tt>setCoinSelector(Wallet.AllowUnconfirmedCoinSelector.get())</tt>. If this method
+     * is called on the wallet then transactions will be used for spending regardless of their confidence. This can
+     * be dangerous - only use this if you absolutely know what you're doing!
+     */
+    public void allowSpendingUnconfirmedTransactions() {
+        setCoinSelector(Wallet.AllowUnconfirmedCoinSelector.get());
+    }
+
     /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
     //
     // Boilerplate for running event listeners - unlocks the wallet, runs, re-locks.
diff --git a/tools/src/main/java/com/google/bitcoin/tools/WalletTool.java b/tools/src/main/java/com/google/bitcoin/tools/WalletTool.java
index 064fcf85..8d66cb9c 100644
--- a/tools/src/main/java/com/google/bitcoin/tools/WalletTool.java
+++ b/tools/src/main/java/com/google/bitcoin/tools/WalletTool.java
@@ -426,11 +426,7 @@ public class WalletTool {
             Wallet.SendRequest req = Wallet.SendRequest.forTx(t);
             req.fee = fee;
             if (allowUnconfirmed) {
-                wallet.setCoinSelector(new Wallet.DefaultCoinSelector() {
-                    @Override protected boolean shouldSelect(Transaction tx) {
-                        return true;  // Accept any transaction that's spendable.
-                    }
-                });
+                wallet.allowSpendingUnconfirmedTransactions();
             }
             if (password != null) {
                 if (!wallet.checkPassword(password)) {