Merge pull request #70 from nicksavers/master

Fix for getting Trie from rootNode

ethereumj-core/src/main/java/org/ethereum/trie/Cache.java

@@ -50,11 +50,9 @@ public class Cache {
 			return this.nodes.get(keyObj).getValue();
 		}
 
-        if (db != null) return new Value(null);
-
 		// Get the key of the database instead and cache it
 		byte[] data = this.db.get(key);
-		Value value = new Value(data);
+		Value value = Value.fromRlpEncoded(data);
 		// Create caching node
 		this.nodes.put(keyObj, new Node(value, false));
 

ethereumj-core/src/main/java/org/ethereum/trie/Trie.java

@@ -10,7 +10,6 @@ import org.ethereum.crypto.HashUtil;
 import org.ethereum.db.ByteArrayWrapper;
 import org.ethereum.util.Value;
 import org.iq80.leveldb.DB;
-import org.spongycastle.util.encoders.Hex;
 
 /**
  * The modified Merkle Patricia tree (trie) provides a persistent data structure 
@@ -68,7 +67,7 @@ public class Trie implements TrieFacade{
 		return root;
 	}
 
-	public void setRoot(Node root) {
+	public void setRoot(byte[] root) {
 		this.root = root;
 	}
 

ethereumj-core/src/main/java/org/ethereum/util/Value.java

@@ -13,10 +13,10 @@ public class Value {
 	
 	private Object value;
 
-	public void fromRlpEncoded(byte[] data) {
+	public static Value fromRlpEncoded(byte[] data) {
 		if (data.length != 0) {
-			this.value = RLP.decode(data, 0).getDecoded();
-		}
+			return new Value(RLP.decode(data, 0).getDecoded());
+		} return null;
 	}
 
 	public Value(Object obj) {

ethereumj-core/src/test/java/org/ethereum/trie/MockDB.java

@@ -1,6 +1,8 @@
 package org.ethereum.trie;
 
 import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
 
 import org.iq80.leveldb.DB;
 import org.iq80.leveldb.DBException;
@@ -13,11 +15,11 @@ import org.iq80.leveldb.WriteOptions;
 
 public class MockDB implements DB {
 	
-	private int addedItems;
+	Map<byte[], byte[]> storage = new HashMap<byte[], byte[]>();
 
 	@Override
 	public void close() throws IOException {
-		// TODO Auto-generated method stub
+		storage.clear();
 	}
 
 	@Override
@@ -33,7 +35,7 @@ public class MockDB implements DB {
 
 	@Override
 	public void delete(byte[] arg0) throws DBException {
-		// TODO Auto-generated method stub
+		storage.remove(arg0);
 	}
 
 	@Override
@@ -45,8 +47,7 @@ public class MockDB implements DB {
 
 	@Override
 	public byte[] get(byte[] arg0) throws DBException {
-		// TODO Auto-generated method stub
-		return null;
+		return storage.get(arg0);
 	}
 
 	@Override
@@ -86,9 +87,8 @@ public class MockDB implements DB {
 	}
 
 	@Override
-	public void put(byte[] arg0, byte[] arg1) throws DBException {
-		// TODO Auto-generated method stub
-		addedItems++;
+	public void put(byte[] key, byte[] value) throws DBException {
+		storage.put(key, value);
 	}
 
 	@Override
@@ -126,6 +126,6 @@ public class MockDB implements DB {
 	 * @return int
 	 */
 	public int getAddedItems() {
-		return addedItems;
+		return storage.size();
 	}	
 }

ethereumj-core/src/test/java/org/ethereum/trie/TrieTest.java

@@ -2,7 +2,10 @@ package org.ethereum.trie;
 
 import static org.junit.Assert.*;
 
+import java.io.IOException;
+
 import org.ethereum.trie.Trie;
+import org.junit.After;
 import org.junit.Test;
 import org.spongycastle.util.encoders.Hex;
 
@@ -30,6 +33,11 @@ public class TrieTest {
 //		G: [ '\x35', 'coin' ]
 //		C: [ '\x20\x6f\x72\x73\x65', 'stallion' ]
 	
+	@After
+	public void closeMockDb() throws IOException {
+		mockDb.close();
+	}
+	
 	@Test
 	public void testEmptyKey() {
 		Trie trie = new Trie(mockDb);
@@ -488,4 +496,14 @@ public class TrieTest {
 		trie.update("te", "testy");
 		assertEquals("8452568af70d8d140f58d941338542f645fcca50094b20f3c3d8c3df49337928", Hex.toHexString(trie.getRootHash()));
 	  }
+	  
+	  @Test
+	  public void testGetFromRootNode() {
+			Trie trie1 = new Trie(mockDb);
+			trie1.update(cat, LONG_STRING);
+			trie1.sync();
+			Trie trie2 = new Trie(mockDb);
+			trie2.setRoot(trie1.getRootHash());
+			assertEquals(LONG_STRING, new String(trie2.get(cat)));
+	  }
 }