From 45ed92bd767e9e88d70c14d81e8bbb7acd2e5fe2 Mon Sep 17 00:00:00 2001
From: James Moger <james.moger@gitblit.com>
Date: Sat, 07 Mar 2015 09:04:17 -0500
Subject: [PATCH] Minor refactoring of user/team checksumming
---
src/main/java/com/gitblit/utils/DeepCopier.java | 33 +++++++++++++++++++++++++++++++++
1 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/src/main/java/com/gitblit/utils/DeepCopier.java b/src/main/java/com/gitblit/utils/DeepCopier.java
index 5d89606..fc76f1a 100644
--- a/src/main/java/com/gitblit/utils/DeepCopier.java
+++ b/src/main/java/com/gitblit/utils/DeepCopier.java
@@ -23,10 +23,43 @@
import java.io.ObjectOutputStream;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
+import java.math.BigInteger;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
public class DeepCopier {
/**
+ * Utility method to calculate the checksum of an object.
+ * @param sourceObject The object from which to establish the checksum.
+ * @return The checksum
+ * @throws IOException
+ */
+ public static BigInteger checksum(Object sourceObject) {
+
+ if (sourceObject == null) {
+ return BigInteger.ZERO;
+ }
+
+ try {
+ ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ ObjectOutputStream oos = new ObjectOutputStream(baos);
+ oos.writeObject(sourceObject);
+ oos.close();
+
+ MessageDigest m = MessageDigest.getInstance("SHA-1");
+ m.update(baos.toByteArray());
+ return new BigInteger(1, m.digest());
+ } catch (IOException e) {
+ throw new RuntimeException(e);
+ } catch (NoSuchAlgorithmException e) {
+ // impossible
+ }
+
+ return BigInteger.ZERO;
+ }
+
+ /**
* Produce a deep copy of the given object. Serializes the entire object to
* a byte array in memory. Recommended for relatively small objects.
*/
--
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