convenience methods to test Discriminator equality.

core/src/main/java/software/sava/core/programs/Discriminator.java

@@ -1,8 +1,11 @@
 package software.sava.core.programs;
 
 import software.sava.core.encoding.ByteUtil;
+import software.sava.core.tx.Instruction;
 
-public interface Discriminator {
+import java.util.function.Predicate;
+
+public interface Discriminator extends Predicate<Instruction> {
 
   int NATIVE_DISCRIMINATOR_LENGTH = Integer.BYTES;
 
@@ -53,4 +56,6 @@ default int write(final byte[] bytes, final int i) {
   default int length() {
     return data().length;
   }
+
+  boolean equals(final byte[] data, final int offset);
 }

core/src/main/java/software/sava/core/programs/DiscriminatorRecord.java

@@ -1,5 +1,7 @@
 package software.sava.core.programs;
 
+import software.sava.core.tx.Instruction;
+
 import java.util.Arrays;
 
 record DiscriminatorRecord(byte[] data) implements Discriminator {
@@ -43,4 +45,21 @@ public boolean equals(final Object o) {
   public int hashCode() {
     return Arrays.hashCode(data);
   }
+
+  @Override
+  public boolean equals(final byte[] data, final int offset) {
+    final int len = data.length - offset;
+    return len >= data.length && Arrays.equals(
+        data, 0, data.length,
+        data, offset, offset + data.length
+    );
+  }
+
+  @Override
+  public boolean test(final Instruction ix) {
+    return ix.len() >= data.length && Arrays.equals(
+        data, 0, data.length,
+        ix.data(), ix.offset(), ix.offset() + data.length
+    );
+  }
 }

settings.gradle

@@ -16,7 +16,7 @@ dependencyResolutionManagement {
   }
   versionCatalogs {
     libs {
-      from("software.sava:solana-version-catalog:0.0.34")
+      from("software.sava:solana-version-catalog:0.1.6")
     }
   }
 }