Merge pull request #2 from KaaCee/DAO

Dao

src/data/block/Block.java

@@ -0,0 +1,86 @@
+package data.block;
+
+import java.math.BigDecimal;
+
+import qora.account.PublicKeyAccount;
+
+public class Block implements BlockData {
+	private int version;
+	private byte[] reference;
+	private int transactionCount;
+	private BigDecimal totalFees;
+	private byte[] transactionsSignature;
+	private int height;
+	private long timestamp;
+	private BigDecimal generatingBalance;
+	private byte[] generatorPublicKey;
+	private byte[] generatorSignature;
+	private byte[] atBytes;
+	private BigDecimal atFees;
+
+	public Block(int version, byte[] reference, int transactionCount, BigDecimal totalFees, byte[] transactionsSignature, 
+			int height, long timestamp, BigDecimal generatingBalance, byte[] generatorPublicKey, byte[] generatorSignature,
+			byte[] atBytes, BigDecimal atFees)
+	{
+		this.version = version;
+		this.reference = reference;
+		this.transactionCount = transactionCount;
+		this.totalFees = totalFees;
+		this.transactionsSignature = transactionsSignature;
+		this.height = height;
+		this.timestamp = timestamp;
+		this.generatingBalance = generatingBalance;
+		this.generatorPublicKey = generatorPublicKey;
+		this.generatorSignature = generatorSignature;
+		this.atBytes = atBytes;
+		this.atFees = atFees;
+	}
+
+	public int getVersion() {
+		return version;
+	}
+
+	public byte[] getReference() {
+		return reference;
+	}
+
+	public int getTransactionCount() {
+		return transactionCount;
+	}
+
+	public BigDecimal getTotalFees() {
+		return totalFees;
+	}
+
+	public byte[] getTransactionsSignature() {
+		return transactionsSignature;
+	}
+
+	public int getHeight() {
+		return height;
+	}
+
+	public long getTimestamp() {
+		return timestamp;
+	}
+
+	public BigDecimal getGeneratingBalance() {
+		return generatingBalance;
+	}
+
+	public byte[] getGeneratorPublicKey() {
+		return generatorPublicKey;
+	}
+
+	public byte[] getGeneratorSignature() {
+		return generatorSignature;
+	}
+
+	public byte[] getAtBytes() {
+		return atBytes;
+	}
+
+	public BigDecimal getAtFees() {
+		return atFees;
+	}
+}

src/data/block/BlockData.java

@@ -0,0 +1,18 @@
+package data.block;
+
+import java.math.BigDecimal;
+
+public interface BlockData {
+	public int getVersion();
+	public byte[] getReference();
+	public int getTransactionCount();
+	public BigDecimal getTotalFees();
+	public byte[] getTransactionsSignature();
+	public int getHeight();
+	public long getTimestamp();
+	public BigDecimal getGeneratingBalance();
+	public byte[] getGeneratorPublicKey();
+	public byte[] getGeneratorSignature();
+	public byte[] getAtBytes();
+	public BigDecimal getAtFees();
+}

src/data/transaction/Transaction.java

@@ -11,6 +11,8 @@ import static java.util.stream.Collectors.toMap;
 public abstract class Transaction {
 
 	// Transaction types
+	// TODO Transaction types are semantic and should go into the business logic layer.
+	// No need to know the meaning of the integer value in data layer
 	public enum TransactionType {
 		GENESIS(1), PAYMENT(2), REGISTER_NAME(3), UPDATE_NAME(4), SELL_NAME(5), CANCEL_SELL_NAME(6), BUY_NAME(7), CREATE_POLL(8), VOTE_ON_POLL(9), ARBITRARY(
 				10), ISSUE_ASSET(11), TRANSFER_ASSET(12), CREATE_ASSET_ORDER(13), CANCEL_ASSET_ORDER(14), MULTIPAYMENT(15), DEPLOY_AT(16), MESSAGE(17);
@@ -29,7 +31,8 @@ public abstract class Transaction {
 	}
 
 	// Properties shared with all transaction types
-	protected TransactionType type;
+	protected TransactionType type;	
+	// TODO PublicKeyAccount is a separate data entity, so here should only be a key to reference it 
 	protected PublicKeyAccount creator;
 	protected long timestamp;
 	protected byte[] reference;

src/qora/block/BlockFactory.java

@@ -1,13 +1,25 @@
 package qora.block;
 
+import java.math.BigDecimal;
 import java.sql.PreparedStatement;
 import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
 
+import data.block.BlockData;
 import database.DB;
 import database.NoDataFoundException;
+import qora.account.PublicKeyAccount;
+import qora.transaction.Transaction;
+import qora.transaction.TransactionFactory;
+import repository.BlockRepository;
+import repository.hsqldb.HSQLDBBlockRepository;
 
 public class BlockFactory {
 
+	// XXX repository should be pushed here from the root entry, no need to know the repository type
+	private static BlockRepository repository = new HSQLDBBlockRepository();
+	
 	/**
 	 * Load Block from DB using block signature.
 	 * 
@@ -35,16 +47,23 @@ public class BlockFactory {
 	 * @return ? extends Block, or null if not found
 	 * @throws SQLException
 	 */
-	public static Block fromHeight(int height) throws SQLException {
+	public static Block fromHeight(int height) {
 		if (height == 1)
 			return GenesisBlock.getInstance();
 
-		PreparedStatement preparedStatement = DB.getConnection().prepareStatement("SELECT signature FROM Blocks WHERE height = ?");
-		preparedStatement.setInt(1, height);
-
 		try {
-			return new Block(DB.checkedExecute(preparedStatement));
-		} catch (NoDataFoundException e) {
+			BlockData data = repository.fromHeight(height);
+	
+			// TODO fill this list from TransactionFactory
+			List<Transaction> transactions = new ArrayList<Transaction>();
+			
+			// TODO fetch account for data.getGeneratorPublicKey()
+			PublicKeyAccount generator = null;
+			
+			return new Block(data.getVersion(), data.getReference(), data.getTimestamp(), data.getGeneratingBalance(),
+					generator,data.getGeneratorSignature(),data.getTransactionsSignature(),
+					data.getAtBytes(), data.getAtFees(), transactions);
+		} catch (Exception e) { // XXX move NoDataFoundException to repository domain and use it here?
 			return null;
 		}
 	}

src/repository/BlockRepository.java

@@ -0,0 +1,8 @@
+package repository;
+
+import data.block.BlockData;
+
+public interface BlockRepository {
+	BlockData fromSignature(byte[] signature) throws DataException;
+	BlockData fromHeight(int height) throws DataException;
+}

src/repository/DataException.java

@@ -0,0 +1,22 @@
+package repository;
+
+public class DataException extends Exception {
+
+	private static final long serialVersionUID = -3963965667288257605L;
+
+    public DataException() {}
+
+    public DataException(String message)
+    {
+       super(message);
+    }
+    
+    public DataException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public DataException(Throwable cause) {
+        super(cause);
+    }
+
+}

src/repository/Repository.java

@@ -3,9 +3,13 @@ package repository;
 public abstract class Repository {
 
 	protected TransactionRepository transactionRepository;
+	protected BlockRepository blockRepository;
 
 	public TransactionRepository getTransactionRepository() {
 		return this.transactionRepository;
 	}
 
+	public BlockRepository getBlockRepository() {
+		return this.blockRepository;
+	}
 }

src/repository/RepositoryManager.java

@@ -12,4 +12,8 @@ public abstract class RepositoryManager {
 		return repository.transactionRepository;
 	}
 
+	public static BlockRepository getBlockRepository() {
+		return repository.blockRepository;
+	}
+
 }

src/repository/hsqldb/HSQLDBBlockRepository.java

@@ -0,0 +1,64 @@
+package repository.hsqldb;
+
+import java.math.BigDecimal;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Timestamp;
+
+import data.block.Block;
+import data.block.BlockData;
+import database.DB;
+import qora.account.PublicKeyAccount;
+import repository.BlockRepository;
+import repository.DataException;
+
+public class HSQLDBBlockRepository implements BlockRepository
+{
+	protected static final int TRANSACTIONS_SIGNATURE_LENGTH = 64;
+	protected static final int GENERATOR_SIGNATURE_LENGTH = 64;
+	protected static final int REFERENCE_LENGTH = GENERATOR_SIGNATURE_LENGTH + TRANSACTIONS_SIGNATURE_LENGTH;
+
+	private static final String BLOCK_DB_COLUMNS = "version, reference, transaction_count, total_fees, "
+			+ "transactions_signature, height, generation, generating_balance, generator, generator_signature, AT_data, AT_fees";
+
+	public BlockData fromSignature(byte[] signature) throws DataException
+	{		
+		ResultSet rs;
+		try {
+			rs = DB.checkedExecute("SELECT " + BLOCK_DB_COLUMNS + " FROM Blocks WHERE signature = ?", signature);
+		} catch (SQLException e) {
+			throw new DataException("Error loading data from DB", e);
+		}
+		return getBlockFromResultSet(rs);
+	}
+
+	public BlockData fromHeight(int height) throws DataException
+	{		
+		ResultSet rs;
+		try {
+			rs = DB.checkedExecute("SELECT " + BLOCK_DB_COLUMNS + " FROM Blocks WHERE height = ?", height);
+		} catch (SQLException e) {
+			throw new DataException("Error loading data from DB", e);
+		}
+		return getBlockFromResultSet(rs);
+	}
+
+	private BlockData getBlockFromResultSet(ResultSet rs) throws DataException {
+		int version = rs.getInt(1);
+		byte[] reference = DB.getResultSetBytes(rs.getBinaryStream(2), REFERENCE_LENGTH);
+		int transactionCount = rs.getInt(3);
+		BigDecimal totalFees = rs.getBigDecimal(4);
+		byte[] transactionsSignature = DB.getResultSetBytes(rs.getBinaryStream(5), TRANSACTIONS_SIGNATURE_LENGTH);
+		int height = rs.getInt(6);
+		long timestamp = rs.getTimestamp(7).getTime();
+		BigDecimal generatingBalance = rs.getBigDecimal(8);
+		byte[] generatorPublicKey = DB.getResultSetBytes(rs.getBinaryStream(9));
+		byte[] generatorSignature = DB.getResultSetBytes(rs.getBinaryStream(10), GENERATOR_SIGNATURE_LENGTH);
+		byte[] atBytes = DB.getResultSetBytes(rs.getBinaryStream(11));
+		BigDecimal atFees = rs.getBigDecimal(12);
+
+		return new Block(version, reference, transactionCount, totalFees, transactionsSignature, height, timestamp,
+				generatingBalance,generatorPublicKey, generatorSignature, atBytes, atFees);
+	}
+}

src/repository/hsqldb/HSQLDBGenesisTransactionRepository.java

@@ -10,7 +10,7 @@ import data.transaction.GenesisTransaction;
 import data.transaction.Transaction;
 import database.DB;
 
-public class HSQLDBGenesisTransaction extends HSQLDBTransaction {
+public class HSQLDBGenesisTransactionRepository extends HSQLDBTransactionRepository {
 
 	Transaction fromBase(byte[] signature, byte[] reference, PublicKeyAccount creator, long timestamp, BigDecimal fee) {
 		try {

src/repository/hsqldb/HSQLDBRepository.java

@@ -5,7 +5,7 @@ import repository.Repository;
 public class HSQLDBRepository extends Repository {
 
 	public HSQLDBRepository() {
-		this.transactionRepository = new HSQLDBTransaction();
+		this.transactionRepository = new HSQLDBTransactionRepository();
 	}
 
 }

src/repository/hsqldb/HSQLDBTransactionRepository.java

@@ -12,12 +12,12 @@ import database.DB;
 import qora.block.Block;
 import repository.TransactionRepository;
 
-public class HSQLDBTransaction implements TransactionRepository {
+public class HSQLDBTransactionRepository implements TransactionRepository {
 
-	private HSQLDBGenesisTransaction genesisTransactionRepository;
+	private HSQLDBGenesisTransactionRepository genesisTransactionRepository;
 
-	public HSQLDBTransaction() {
-		genesisTransactionRepository = new HSQLDBGenesisTransaction();
+	public HSQLDBTransactionRepository() {
+		genesisTransactionRepository = new HSQLDBGenesisTransactionRepository();
 	}
 
 	public Transaction fromSignature(byte[] signature) {