Add getDigestString methods

trustyuri · Mar 7, 2018 · e1bfef0 · e1bfef0
1 parent 4159533
commit e1bfef0
Showing 1 changed file with 22 additions and 0 deletions.
diff --git a/src/main/java/net/trustyuri/rdf/RdfHasher.java b/src/main/java/net/trustyuri/rdf/RdfHasher.java
@@ -77,6 +77,19 @@ public static MessageDigest digest(List<Statement> statements) {
  return md;
  }
 
+ public static String getDigestString(List<Statement> statements) {
+ StringBuilder sb = new StringBuilder();
+ Collections.sort(statements, new StatementComparator());
+ Statement previous = null;
+ for (Statement st : statements) {
+ if (!st.equals(previous)) {
+ sb.append(getDigestString(st));
+ }
+ previous = st;
+ }
+ return sb.toString();
+ }
+
  public static MessageDigest getDigest() {
  MessageDigest md = null;
  try {
@@ -106,6 +119,15 @@ public static void digest(Statement st, MessageDigest md) {
  md.update(valueToString(st.getObject()).getBytes());
  }
 
+ public static String getDigestString(Statement st) {
+ String s = "";
+ s += valueToString(st.getContext());
+ s += valueToString(st.getSubject());
+ s += valueToString(st.getPredicate());
+ s += valueToString(st.getObject());
+ return s;
+ }
+
  private static String valueToString(Value v) {
  if (v instanceof URI) {
  return ((URI) v).toString() + "\n";