code cleanup

Author: hmottestad

core/sail/base/src/main/java/org/eclipse/rdf4j/sail/base/Changeset.java

@@ -8,7 +8,6 @@
  *
  * SPDX-License-Identifier: BSD-3-Clause
  *******************************************************************************/
-// Some portions generated by Codex
 package org.eclipse.rdf4j.sail.base;
 
 import java.lang.invoke.VarHandle;
@@ -159,31 +158,18 @@ private static boolean hasStatementChanges(Changeset changeset) {
 
 	@Override
 	public void close() throws SailException {
-		if (closed) {
-			return;
-		}
 		closed = true;
 		refbacks = null;
 		prepend = null;
 		observed = null;
 		approved = null;
-		approvedEmpty = true;
 		deprecated = null;
-		deprecatedEmpty = true;
 		approvedContexts = null;
 		deprecatedContexts = null;
 		addedNamespaces = null;
 		removedPrefixes = null;
 	}
 
-	void detachStatementModels() {
-		approved = null;
-		approvedEmpty = true;
-		deprecated = null;
-		deprecatedEmpty = true;
-		approvedContexts = null;
-	}
-
 	@Override
 	public void prepare() throws SailException {
 		assert !closed;
@@ -299,17 +285,6 @@ public void prepend(Changeset changeset) {
 		}
 	}
 
-	boolean prepends(Changeset changeset) {
-		assert !closed;
-
-		prependLock.acquireUninterruptibly();
-		try {
-			return prepend != null && prepend.contains(changeset);
-		} finally {
-			prependLock.release();
-		}
-	}
-
 	@Override
 	public void setNamespace(String prefix, String name) {
 		assert !closed;