/*
* Copyright DataStax, Inc.
*
* Licensed 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 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 edu.umd.cs.findbugs.annotations.NonNull;
import java.util.Queue;
import java.util.concurrent.CompletionStage;
import net.jcip.annotations.NotThreadSafe;
@NotThreadSafe // wraps a mutable queue
public class DefaultAsyncGraphResultSet implements AsyncGraphResultSet {
private final ExecutionInfo executionInfo;
private final CountingIterator<GraphNode> iterator;
private final Iterable<GraphNode> currentPage;
public DefaultAsyncGraphResultSet(
ExecutionInfo executionInfo, Queue<GraphNode> data, GraphProtocol graphProtocol) {
this.executionInfo = executionInfo;
this.iterator = new GraphResultIterator(data, graphProtocol);
this.currentPage = () -> iterator;
}
@NonNull
@Override
public ExecutionInfo getRequestExecutionInfo() {
return executionInfo;
}
@NonNull
@Override
@Deprecated
public com.datastax.dse.driver.api.core.graph.GraphExecutionInfo getExecutionInfo() {
return GraphExecutionInfoConverter.convert(executionInfo);
}
@Override
public int remaining() {
return iterator.remaining();
}
@NonNull
@Override
public Iterable<GraphNode> currentPage() {
return currentPage;
}
@Override
public boolean hasMorePages() {
return false;
}
@NonNull
@Override
public CompletionStage<AsyncGraphResultSet> fetchNextPage() throws IllegalStateException {
throw new IllegalStateException(
"No next page. Use #hasMorePages before calling this method to avoid this error.");
}
@Override
public void cancel() {
// nothing to do
}
}