small additions

Author: hendrikebbers

abi-parser/src/main/java/com/openelements/hiero/smartcontract/abi/model/AbiEvent.java

@@ -5,7 +5,6 @@
 import java.nio.charset.StandardCharsets;
 import java.util.List;
 import java.util.Objects;
-import org.bouncycastle.jcajce.provider.digest.Keccak;
 import org.jspecify.annotations.NonNull;
 
 public record AbiEvent(@NonNull String name, @NonNull List<AbiParameter> inputs, boolean anonymous) implements AbiEntry{
@@ -20,10 +19,12 @@ public AbiEntryType type() {
         return AbiEntryType.EVENT;
     }
 
+    @NonNull
     public List<AbiParameter> getIndexedInputParameters() {
         return inputs.stream().filter(AbiParameter::indexed).toList();
     }
 
+    @NonNull
     public List<AbiParameter> getNonIndexedInputParameters() {
         return inputs.stream().filter(parameter -> !parameter.indexed()).toList();
     }

abi-parser/src/main/java/com/openelements/hiero/smartcontract/abi/model/AbiParameterType.java

@@ -17,6 +17,7 @@ public static AbiParameterType of(final String name) {
             case "bool" -> BOOL;
             case "uint256" -> UINT256;
             case "uint" -> UINT;
+            case "tuple" -> TUPLE;
             default -> throw new IllegalArgumentException("Unknown value type: " + name);
         };
     }

abi-parser/src/main/java/com/openelements/hiero/smartcontract/abi/util/HexConverter.java

@@ -20,4 +20,14 @@ public static String bytesToHex(@NonNull final byte[] bytes) {
         }
         return new String(hexChars, StandardCharsets.UTF_8).toLowerCase();
     }
+
+    public static byte[] hexToBytes(@NonNull final String hex) {
+        int len = hex.length();
+        byte[] data = new byte[len / 2];
+        for (int i = 0; i < len; i += 2) {
+            data[i / 2] = (byte) ((Character.digit(hex.charAt(i), 16) << 4)
+                    + Character.digit(hex.charAt(i+1), 16));
+        }
+        return data;
+    }
 }