com.google.gerrit.index.query.ResultSet Maven / Gradle / Ivy
// Copyright 2008 Google 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.google.gerrit.index.query;
import com.google.common.collect.ImmutableList;
import java.util.Iterator;
/**
* Result from any data store query function.
*
* @param type of entity being returned by the query.
*/
public interface ResultSet extends Iterable {
/**
* Obtain an iterator to loop through the results.
*
* The iterator can be obtained only once. When the iterator completes ( hasNext()
* returns false) {@link #close()} will be automatically called.
*/
@Override
Iterator iterator();
/**
* Materialize all results as a single list.
*
* Prior to returning {@link #close()} is invoked. This method must not be combined with {@link
* #iterator()} on the same instance.
*
* @return immutable list of the complete results.
*/
ImmutableList toList();
/**
* Close the result, discarding any further results.
*
* This method may be invoked more than once. Its main use is to stop obtaining results before
* the iterator has finished.
*/
void close();
Object searchAfter();
}