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// Copyright (C) 2016 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;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
import com.google.gerrit.index.Index;
import com.google.gerrit.index.IndexCollection;
import com.google.gerrit.index.IndexConfig;
import com.google.gerrit.index.Schema;
import com.google.gwtorm.server.OrmException;
import java.util.List;
import java.util.Set;
/**
* Execute a single query over a secondary index, for use by Gerrit internals.
*
* <p>By default, visibility of returned entities is not enforced (unlike in {@link
* QueryProcessor}). The methods in this class are not typically used by user-facing paths, but
* rather by internal callers that need to process all matching results.
*
* <p>Instances are one-time-use. Other singleton classes should inject a Provider rather than
* holding on to a single instance.
*/
public class InternalQuery<T> {
private final QueryProcessor<T> queryProcessor;
private final IndexCollection<?, T, ? extends Index<?, T>> indexes;
protected final IndexConfig indexConfig;
protected InternalQuery(
QueryProcessor<T> queryProcessor,
IndexCollection<?, T, ? extends Index<?, T>> indexes,
IndexConfig indexConfig) {
this.queryProcessor = queryProcessor.enforceVisibility(false);
this.indexes = indexes;
this.indexConfig = indexConfig;
}
public InternalQuery<T> setLimit(int n) {
queryProcessor.setUserProvidedLimit(n);
return this;
}
public InternalQuery<T> enforceVisibility(boolean enforce) {
queryProcessor.enforceVisibility(enforce);
return this;
}
public InternalQuery<T> setRequestedFields(Set<String> fields) {
queryProcessor.setRequestedFields(fields);
return this;
}
public InternalQuery<T> noFields() {
queryProcessor.setRequestedFields(ImmutableSet.<String>of());
return this;
}
public List<T> query(Predicate<T> p) throws OrmException {
try {
return queryProcessor.query(p).entities();
} catch (QueryParseException e) {
throw new OrmException(e);
}
}
/**
* Run multiple queries in parallel.
*
* <p>If a limit was specified using {@link #setLimit(int)}, that limit is applied to each query
* independently.
*
* @param queries list of queries.
* @return results of the queries, one list of results per input query, in the same order as the
* input.
*/
public List<List<T>> query(List<Predicate<T>> queries) throws OrmException {
try {
return Lists.transform(queryProcessor.query(queries), QueryResult::entities);
} catch (QueryParseException e) {
throw new OrmException(e);
}
}
protected Schema<T> schema() {
Index<?, T> index = indexes != null ? indexes.getSearchIndex() : null;
return index != null ? index.getSchema() : null;
}
}
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