nastra commented on code in PR #7913:
URL: https://github.com/apache/iceberg/pull/7913#discussion_r1358620356


##########
core/src/main/java/org/apache/iceberg/rest/CatalogHandlers.java:
##########
@@ -374,4 +385,107 @@ static TableMetadata commit(TableOperations ops, 
UpdateTableRequest request) {
 
     return ops.current();
   }
+
+  public static BaseView baseView(View view) {
+    Preconditions.checkArgument(view instanceof BaseView, "View must be a 
BaseView");
+    return (BaseView) view;
+  }
+
+  public static ListTablesResponse listViews(ViewCatalog catalog, Namespace 
namespace) {
+    return 
ListTablesResponse.builder().addAll(catalog.listViews(namespace)).build();
+  }
+
+  public static LoadViewResponse createView(
+      ViewCatalog catalog, Namespace namespace, CreateViewRequest request) {
+    request.validate();
+
+    ViewMetadata viewMetadata = request.metadata();
+    ViewBuilder viewBuilder =
+        catalog
+            .buildView(TableIdentifier.of(namespace, request.name()))
+            .withSchema(viewMetadata.schema())
+            .withProperties(viewMetadata.properties())
+            
.withDefaultNamespace(viewMetadata.currentVersion().defaultNamespace())
+            
.withDefaultCatalog(viewMetadata.currentVersion().defaultCatalog());
+    viewMetadata.currentVersion().representations().stream()
+        .filter(r -> r instanceof SQLViewRepresentation)
+        .map(r -> (SQLViewRepresentation) r)
+        .forEach(r -> viewBuilder.withQuery(r.dialect(), r.sql()));
+    View view = viewBuilder.create();
+
+    return viewResponse(view);
+  }
+
+  private static LoadViewResponse viewResponse(View view) {
+    ViewMetadata metadata = baseView(view).operations().current();
+    return ImmutableLoadViewResponse.builder()
+        .metadata(metadata)
+        .metadataLocation(metadata.metadataFileLocation())
+        .build();
+  }
+
+  public static LoadViewResponse loadView(ViewCatalog catalog, TableIdentifier 
viewIdentifier) {
+    View view = catalog.loadView(viewIdentifier);
+    return viewResponse(view);
+  }
+
+  public static LoadViewResponse updateView(
+      ViewCatalog catalog, TableIdentifier ident, UpdateTableRequest request) {
+    View view = catalog.loadView(ident);
+    ViewMetadata metadata = commit(baseView(view).operations(), request);
+
+    return ImmutableLoadViewResponse.builder()
+        .metadata(metadata)
+        .metadataLocation(metadata.metadataFileLocation())
+        .build();
+  }
+
+  public static void renameView(ViewCatalog catalog, RenameTableRequest 
request) {
+    catalog.renameView(request.source(), request.destination());
+  }
+
+  public static void dropView(ViewCatalog catalog, TableIdentifier 
viewIdentifier) {
+    boolean dropped = catalog.dropView(viewIdentifier);
+    if (!dropped) {
+      throw new NoSuchViewException("View does not exist: %s", viewIdentifier);
+    }
+  }
+
+  static ViewMetadata commit(ViewOperations ops, UpdateTableRequest request) {
+    AtomicBoolean isRetry = new AtomicBoolean(false);
+    try {
+      Tasks.foreach(ops)
+          .retry(COMMIT_NUM_RETRIES_DEFAULT)
+          .exponentialBackoff(
+              COMMIT_MIN_RETRY_WAIT_MS_DEFAULT,
+              COMMIT_MAX_RETRY_WAIT_MS_DEFAULT,
+              COMMIT_TOTAL_RETRY_TIME_MS_DEFAULT,
+              2.0 /* exponential */)
+          .onlyRetryOn(CommitFailedException.class)
+          .run(
+              taskOps -> {
+                ViewMetadata base = isRetry.get() ? taskOps.refresh() : 
taskOps.current();
+                isRetry.set(true);
+
+                // apply changes
+                ViewMetadata.Builder metadataBuilder = 
ViewMetadata.buildFrom(base);
+                request.updates().forEach(update -> 
update.applyTo(metadataBuilder));

Review Comment:
   I've opened https://github.com/apache/iceberg/pull/8831 to introduce 
`AssertUUID` (and deprecate `AssertTableUUID`) so that we can use it both for 
tables and views. Alternatively, we could also introduce `AssertViewUUID` with 
the same functionality as `AssertTableUUID`



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