content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.datastax.dse.driver.internal.core.graph;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.spy;
  import static org.mockito.Mockito.when;
  
  import com.datastax.dse.driver.api.core.graph.AsyncGraphResultSet;
  import com.datastax.dse.driver.api.core.graph.GraphNode;
  import com.datastax.oss.driver.api.core.cql.ExecutionInfo;
  import com.datastax.oss.driver.internal.core.util.CountingIterator;
  import com.datastax.oss.driver.shaded.guava.common.collect.Lists;
  import java.util.Arrays;
  import java.util.Iterator;
  import java.util.Queue;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.CompletionStage;
  
  public abstract class GraphResultSetTestBase {
  
    /** Mocks an async result set where column 0 has type INT, with rows with the provided data. */
    protected AsyncGraphResultSet mockPage(boolean nextPage, Integer... data) {
      AsyncGraphResultSet page = mock(AsyncGraphResultSet.class);
  
      ExecutionInfo executionInfo = mock(ExecutionInfo.class);
      when(page.getRequestExecutionInfo()).thenReturn(executionInfo);
  
      if (nextPage) {
        when(page.hasMorePages()).thenReturn(true);
        when(page.fetchNextPage()).thenReturn(spy(new CompletableFuture<>()));
      } else {
        when(page.hasMorePages()).thenReturn(false);
        when(page.fetchNextPage()).thenThrow(new IllegalStateException());
      }
  
      // Emulate DefaultAsyncResultSet's internals (this is a bit sketchy, maybe it would be better
      // to use real DefaultAsyncResultSet instances)
      Queue<Integer> queue = Lists.newLinkedList(Arrays.asList(data));
      CountingIterator<GraphNode> iterator =
          new CountingIterator<GraphNode>(queue.size()) {
            @Override
            protected GraphNode computeNext() {
              Integer index = queue.poll();
              return (index == null) ? endOfData() : mockRow(index);
            }
          };
      when(page.currentPage()).thenReturn(() -> iterator);
      when(page.remaining()).thenAnswer(invocation -> iterator.remaining());
  
      return page;
    }
  
    private GraphNode mockRow(int index) {
      GraphNode row = mock(GraphNode.class);
      when(row.asInt()).thenReturn(index);
      return row;
    }
  
    protected static void complete(
        CompletionStage<AsyncGraphResultSet> stage, AsyncGraphResultSet result) {
      stage.toCompletableFuture().complete(result);
    }
  
    protected void assertNextRow(Iterator<GraphNode> iterator, int expectedValue) {
      assertThat(iterator.hasNext()).isTrue();
      GraphNode row = iterator.next();
      assertThat(row.asInt()).isEqualTo(expectedValue);
    }
  }
  