Add a DiskBlockStore and associated unit tests. This removes the need to download the block chain from scratch each time a program is started up.

tests/com/google/bitcoin/core/BlockChainTest.java

@@ -40,13 +40,13 @@ public class BlockChainTest {
 
     @Before
     public void setUp() {
-        testNetChain = new BlockChain(testNet, new Wallet(testNet));
+        testNetChain = new BlockChain(testNet, new Wallet(testNet), new MemoryBlockStore(testNet));
 
         unitTestParams = NetworkParameters.unitTests();
         wallet = new Wallet(unitTestParams);
         wallet.addKey(new ECKey());
         coinbaseTo = wallet.keychain.get(0).toAddress(unitTestParams);
-        chain = new BlockChain(unitTestParams, wallet);
+        chain = new BlockChain(unitTestParams, wallet, new MemoryBlockStore(unitTestParams));
     }
 
     @Test

tests/com/google/bitcoin/core/BlockTest.java

@@ -101,6 +101,14 @@ public class BlockTest {
         }
     }
 
+    @Test
+    public void testHeaderParse() throws Exception {
+        Block block = new Block(params, blockBytes);
+        Block header = block.cloneAsHeader();
+        Block reparsed = new Block(params, header.bitcoinSerialize());
+        assertEquals(reparsed, header);
+    }
+
     @Test
     public void testBitCoinSerialization() throws Exception {
         // We have to be able to reserialize everything exactly as we found it for hashing to work. This test also

tests/com/google/bitcoin/core/DiskBlockStoreTest.java

@@ -0,0 +1,47 @@
+/**
+ * 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.core;
+
+import org.junit.Test;
+import java.io.File;
+import static org.junit.Assert.assertEquals;
+
+public class DiskBlockStoreTest {
+    @Test
+    public void testStorage() throws Exception {
+        File temp = File.createTempFile("bitcoinj-test", null, null);
+        System.out.println(temp.getAbsolutePath());
+        //temp.deleteOnExit();
+
+        NetworkParameters params = NetworkParameters.unitTests();
+        Address to = new ECKey().toAddress(params);
+        DiskBlockStore store = new DiskBlockStore(params, temp);
+        // Check the first block in a new store is the genesis block.
+        StoredBlock genesis = store.getChainHead();
+        assertEquals(params.genesisBlock, genesis.getHeader());
+
+        // Build a new block.
+        StoredBlock b1 = genesis.build(genesis.getHeader().createNextBlock(to).cloneAsHeader());
+        store.put(b1);
+        store.setChainHead(b1);
+        // Check we can get it back out again if we rebuild the store object.
+        store = new DiskBlockStore(params, temp);
+        StoredBlock b2 = store.get(b1.getHeader().getHash());
+        assertEquals(b1, b2);
+        // Check the chain head was stored correctly also.
+        assertEquals(b1, store.getChainHead());
+    }
+}