Added method to retrieve predicates from sub_proof

Signed-off-by: artem.ivanov <artem.ivanov@dsr-corporation.com>

src/types.rs

@@ -1185,9 +1185,9 @@ impl SubProofRequestBuilder {
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub struct Predicate {
-    pub(crate) attr_name: String,
-    pub(crate) p_type: PredicateType,
-    pub(crate) value: i32,
+    pub attr_name: String,
+    pub p_type: PredicateType,
+    pub value: i32,
 }
 
 impl Predicate {
@@ -1253,6 +1253,14 @@ impl SubProof {
         }
         Ok(res)
     }
+
+    pub fn predicates(&self) -> Vec<Predicate> {
+        self.primary_proof
+            .ne_proofs
+            .iter()
+            .map(|proof| proof.predicate.clone())
+            .collect()
+    }
 }
 
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]