From b5d04a36e1abe954496f912383639ca083722be9 Mon Sep 17 00:00:00 2001
From: Mike Hearn <hearn@google.com>
Date: Tue, 14 Jun 2011 13:42:41 +0000
Subject: [PATCH] Add a program that just loads a wallet, runs through the
 block chain, and then saves/prints out the resulting wallet at the end.

---
 .../bitcoin/examples/RefreshWallet.java       | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 src/com/google/bitcoin/examples/RefreshWallet.java

diff --git a/src/com/google/bitcoin/examples/RefreshWallet.java b/src/com/google/bitcoin/examples/RefreshWallet.java
new file mode 100644
index 00000000..ac184a89
--- /dev/null
+++ b/src/com/google/bitcoin/examples/RefreshWallet.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.bitcoin.examples;
+
+import com.google.bitcoin.core.*;
+
+import java.io.File;
+import java.math.BigInteger;
+import java.net.InetAddress;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * RefreshWallet loads a wallet, then processes the block chain to update the transaction pools within it.
+ */
+public class RefreshWallet {
+    public static void main(String[] args) throws Exception {
+        File file = new File(args[0]);
+        Wallet wallet = Wallet.loadFromFile(file);
+        System.out.println(wallet.toString());
+
+        // Set up the components and link them together.
+        final NetworkParameters params = NetworkParameters.testNet();
+        BlockStore blockStore = new MemoryBlockStore(params);
+        NetworkConnection conn = new NetworkConnection(InetAddress.getLocalHost(), params,
+                                                       blockStore.getChainHead().getHeight(), 60000);
+        BlockChain chain = new BlockChain(params, wallet, blockStore);
+        Peer peer = new Peer(params, conn, chain);
+        peer.start();
+
+        wallet.addEventListener(new WalletEventListener() {
+            public void onCoinsReceived(Wallet w, Transaction tx, BigInteger prevBalance, BigInteger newBalance) {
+                System.out.println("\nReceived tx " + tx.getHashAsString());
+                System.out.println(tx.toString());
+            }
+        });
+
+        // Now download and process the block chain.
+        CountDownLatch progress = peer.startBlockChainDownload();
+        long max = progress.getCount();  // Racy but no big deal.
+        if (max > 0) {
+            System.out.println("Downloading block chain. " + (max > 1000 ? "This may take a while." : ""));
+            long current = max;
+            while (current > 0) {
+                double pct = 100.0 - (100.0 * (current / (double) max));
+                System.out.println(String.format("Chain download %d%% done", (int) pct));
+                progress.await(1, TimeUnit.SECONDS);
+                current = progress.getCount();
+            }
+        }
+        peer.disconnect();
+        wallet.saveToFile(file);
+        System.out.println("\nDone!\n");
+        System.out.println(wallet.toString());
+    }
+}