fix: add missing file after renaming

Author: bevzzz

src/main/java/io/weaviate/client6/v1/api/collections/pagination/AsyncPage.java

@@ -0,0 +1,58 @@
+package io.weaviate.client6.v1.api.collections.pagination;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.BiFunction;
+
+import io.weaviate.client6.v1.api.collections.WeaviateObject;
+import io.weaviate.client6.v1.api.collections.query.QueryMetadata;
+
+public final class AsyncPage<PropertiesT> implements Iterable<WeaviateObject<PropertiesT, Object, QueryMetadata>> {
+
+  private final int pageSize;
+  private final BiFunction<String, Integer, CompletableFuture<List<WeaviateObject<PropertiesT, Object, QueryMetadata>>>> fetch;
+
+  private final String cursor;
+  private List<WeaviateObject<PropertiesT, Object, QueryMetadata>> currentPage = new ArrayList<>();
+
+  AsyncPage(String cursor, int pageSize,
+      BiFunction<String, Integer, CompletableFuture<List<WeaviateObject<PropertiesT, Object, QueryMetadata>>>> fetch) {
+    this.cursor = cursor;
+    this.pageSize = pageSize;
+    this.fetch = fetch;
+  }
+
+  AsyncPage(String cursor, int pageSize,
+      BiFunction<String, Integer, CompletableFuture<List<WeaviateObject<PropertiesT, Object, QueryMetadata>>>> fetch,
+      List<WeaviateObject<PropertiesT, Object, QueryMetadata>> currentPage) {
+    this(cursor, pageSize, fetch);
+    this.currentPage = Collections.unmodifiableList(currentPage);
+  }
+
+  List<WeaviateObject<PropertiesT, Object, QueryMetadata>> items() {
+    return currentPage;
+  }
+
+  public boolean isEmpty() {
+    return this.currentPage.isEmpty();
+  }
+
+  public CompletableFuture<AsyncPage<PropertiesT>> fetchNextPage() {
+    return fetch.apply(cursor, pageSize)
+        .thenApply(nextPage -> {
+          if (nextPage.isEmpty()) {
+            return new AsyncPage<>(null, pageSize, fetch, nextPage);
+          }
+          var last = nextPage.get(nextPage.size() - 1);
+          return new AsyncPage<>(last.metadata().uuid(), pageSize, fetch, nextPage);
+        });
+  }
+
+  @Override
+  public Iterator<WeaviateObject<PropertiesT, Object, QueryMetadata>> iterator() {
+    return currentPage.iterator();
+  }
+}