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// Copyright (C) 2015 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;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableSet;
import com.google.common.primitives.Ints;
import com.google.gerrit.common.Nullable;
import java.util.Set;
import java.util.function.Function;
@AutoValue
public abstract class QueryOptions {
public static QueryOptions create(IndexConfig config, int start, int limit, Set<String> fields) {
return create(config, start, null, limit, config.pageSizeMultiplier(), limit, fields);
}
public static QueryOptions create(
IndexConfig config, int start, int pageSize, int limit, Set<String> fields) {
return create(config, start, null, pageSize, config.pageSizeMultiplier(), limit, fields);
}
public static QueryOptions create(
IndexConfig config,
int start,
int pageSize,
int pageSizeMultiplier,
int limit,
Set<String> fields) {
return create(config, start, null, pageSize, pageSizeMultiplier, limit, fields);
}
public static QueryOptions create(
IndexConfig config,
int start,
Object searchAfter,
int pageSize,
int pageSizeMultiplier,
int limit,
Set<String> fields) {
checkArgument(start >= 0, "start must be nonnegative: %s", start);
checkArgument(limit > 0, "limit must be positive: %s", limit);
if (searchAfter != null) {
checkArgument(start == 0, "start must be 0 when searchAfter is specified: %s", start);
}
return new AutoValue_QueryOptions(
config,
start,
searchAfter,
pageSize,
pageSizeMultiplier,
limit,
ImmutableSet.copyOf(fields));
}
public QueryOptions convertForBackend() {
// Increase the limit rather than skipping, since we don't know how many
// skipped results would have been filtered out by the enclosing AndSource.
int backendLimit = config().maxLimit();
int limit = Ints.saturatedCast((long) limit() + start());
limit = Math.min(limit, backendLimit);
int pageSize =
Math.min(
Math.min(Ints.saturatedCast((long) pageSize() + start()), config().maxPageSize()),
backendLimit);
return create(config(), 0, null, pageSize, pageSizeMultiplier(), limit, fields());
}
public abstract IndexConfig config();
public abstract int start();
@Nullable
public abstract Object searchAfter();
public abstract int pageSize();
public abstract int pageSizeMultiplier();
public abstract int limit();
public abstract ImmutableSet<String> fields();
public QueryOptions withPageSize(int pageSize) {
return create(
config(), start(), searchAfter(), pageSize, pageSizeMultiplier(), limit(), fields());
}
public QueryOptions withLimit(int newLimit) {
return create(
config(), start(), searchAfter(), pageSize(), pageSizeMultiplier(), newLimit, fields());
}
public QueryOptions withStart(int newStart) {
return create(
config(), newStart, searchAfter(), pageSize(), pageSizeMultiplier(), limit(), fields());
}
public QueryOptions withSearchAfter(Object newSearchAfter) {
// Index search-after APIs don't use 'start', so set it to 0 to be safe. ElasticSearch for
// example, expects it to be 0 when using search-after APIs.
return create(
config(), start(), newSearchAfter, pageSize(), pageSizeMultiplier(), limit(), fields())
.withStart(0);
}
public QueryOptions filterFields(Function<QueryOptions, Set<String>> filter) {
return create(
config(),
start(),
searchAfter(),
pageSize(),
pageSizeMultiplier(),
limit(),
filter.apply(this));
}
}
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