From 40d879813d923da765690a19cee6ee7ae639b946 Mon Sep 17 00:00:00 2001
From: catbref <misc-github@talk2dom.com>
Date: Thu, 26 Sep 2019 17:22:03 +0100
Subject: [PATCH] Added exists() test to BlockRepository & HSQLDB
 implementation

---
 src/main/java/org/qora/repository/BlockRepository.java   | 5 +++++
 .../qora/repository/hsqldb/HSQLDBBlockRepository.java    | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/src/main/java/org/qora/repository/BlockRepository.java b/src/main/java/org/qora/repository/BlockRepository.java
index d12e490f..084332aa 100644
--- a/src/main/java/org/qora/repository/BlockRepository.java
+++ b/src/main/java/org/qora/repository/BlockRepository.java
@@ -37,6 +37,11 @@ public interface BlockRepository {
 	 */
 	public BlockData fromHeight(int height) throws DataException;
 
+	/**
+	 * Returns whether block exists based on passed block signature.
+	 */
+	public boolean exists(byte[] signature) throws DataException;
+
 	/**
 	 * Return height of block in blockchain using block's signature.
 	 * 
diff --git a/src/main/java/org/qora/repository/hsqldb/HSQLDBBlockRepository.java b/src/main/java/org/qora/repository/hsqldb/HSQLDBBlockRepository.java
index bff9132f..c8acd507 100644
--- a/src/main/java/org/qora/repository/hsqldb/HSQLDBBlockRepository.java
+++ b/src/main/java/org/qora/repository/hsqldb/HSQLDBBlockRepository.java
@@ -88,6 +88,15 @@ public class HSQLDBBlockRepository implements BlockRepository {
 		}
 	}
 
+	@Override
+	public boolean exists(byte[] signature) throws DataException {
+		try {
+			return this.repository.exists("Blocks", "signature = ?", signature);
+		} catch (SQLException e) {
+			throw new DataException("Unable to check for block in repository", e);
+		}
+	}
+
 	@Override
 	public int getHeightFromSignature(byte[] signature) throws DataException {
 		try (ResultSet resultSet = this.repository.checkedExecute("SELECT height FROM Blocks WHERE signature = ? LIMIT 1", signature)) {