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// 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(); }





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