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// Copyright (C) 2014 The Android Open Source Project
//
// 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;
public interface DataSource<T> {
/** Returns an estimate of the number of results from {@link #read()}. */
int getCardinality();
/** Returns read from the index and return the results. */
ResultSet<T> read();
/** Returns read from the index and return the raw results. */
ResultSet<FieldBundle> readRaw();
}