/
AggregateIterableImpl.java
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/
AggregateIterableImpl.java
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/*
* Copyright 2008-present MongoDB, 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.mongodb.client.internal;
import com.mongodb.MongoNamespace;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.WriteConcern;
import com.mongodb.client.AggregateIterable;
import com.mongodb.client.ClientSession;
import com.mongodb.client.model.AggregationLevel;
import com.mongodb.client.model.Collation;
import com.mongodb.client.model.FindOptions;
import com.mongodb.internal.operation.SyncOperations;
import com.mongodb.lang.Nullable;
import com.mongodb.operation.BatchCursor;
import com.mongodb.operation.ReadOperation;
import org.bson.BsonDocument;
import org.bson.BsonString;
import org.bson.codecs.configuration.CodecRegistry;
import org.bson.conversions.Bson;
import java.util.List;
import java.util.concurrent.TimeUnit;
import static com.mongodb.assertions.Assertions.notNull;
class AggregateIterableImpl<TDocument, TResult> extends MongoIterableImpl<TResult> implements AggregateIterable<TResult> {
private SyncOperations<TDocument> operations;
private final MongoNamespace namespace;
private final Class<TDocument> documentClass;
private final Class<TResult> resultClass;
private final CodecRegistry codecRegistry;
private final List<? extends Bson> pipeline;
private final AggregationLevel aggregationLevel;
private Boolean allowDiskUse;
private long maxTimeMS;
private long maxAwaitTimeMS;
private Boolean useCursor;
private Boolean bypassDocumentValidation;
private Collation collation;
private String comment;
private Bson hint;
AggregateIterableImpl(@Nullable final ClientSession clientSession, final String databaseName, final Class<TDocument> documentClass,
final Class<TResult> resultClass, final CodecRegistry codecRegistry, final ReadPreference readPreference,
final ReadConcern readConcern, final WriteConcern writeConcern, final OperationExecutor executor,
final List<? extends Bson> pipeline, final AggregationLevel aggregationLevel) {
this(clientSession, new MongoNamespace(databaseName, "ignored"), documentClass, resultClass, codecRegistry, readPreference,
readConcern, writeConcern, executor, pipeline, aggregationLevel, true);
}
AggregateIterableImpl(@Nullable final ClientSession clientSession, final String databaseName, final Class<TDocument> documentClass,
final Class<TResult> resultClass, final CodecRegistry codecRegistry, final ReadPreference readPreference,
final ReadConcern readConcern, final WriteConcern writeConcern, final OperationExecutor executor,
final List<? extends Bson> pipeline, final AggregationLevel aggregationLevel, final boolean retryReads) {
this(clientSession, new MongoNamespace(databaseName, "ignored"), documentClass, resultClass, codecRegistry, readPreference,
readConcern, writeConcern, executor, pipeline, aggregationLevel, retryReads);
}
AggregateIterableImpl(@Nullable final ClientSession clientSession, final MongoNamespace namespace, final Class<TDocument> documentClass,
final Class<TResult> resultClass, final CodecRegistry codecRegistry, final ReadPreference readPreference,
final ReadConcern readConcern, final WriteConcern writeConcern, final OperationExecutor executor,
final List<? extends Bson> pipeline, final AggregationLevel aggregationLevel, final boolean retryReads) {
super(clientSession, executor, readConcern, readPreference, retryReads);
this.operations = new SyncOperations<TDocument>(namespace, documentClass, readPreference, codecRegistry, readConcern, writeConcern,
true, retryReads);
this.namespace = notNull("namespace", namespace);
this.documentClass = notNull("documentClass", documentClass);
this.resultClass = notNull("resultClass", resultClass);
this.codecRegistry = notNull("codecRegistry", codecRegistry);
this.pipeline = notNull("pipeline", pipeline);
this.aggregationLevel = notNull("aggregationLevel", aggregationLevel);
}
@Override
public void toCollection() {
if (getOutNamespace() == null) {
throw new IllegalStateException("The last stage of the aggregation pipeline must be $out or $merge");
}
getExecutor().execute(operations.aggregateToCollection(pipeline, maxTimeMS, allowDiskUse, bypassDocumentValidation, collation, hint,
comment, aggregationLevel), getReadConcern(), getClientSession());
}
@Override
public AggregateIterable<TResult> allowDiskUse(@Nullable final Boolean allowDiskUse) {
this.allowDiskUse = allowDiskUse;
return this;
}
@Override
public AggregateIterable<TResult> batchSize(final int batchSize) {
super.batchSize(batchSize);
return this;
}
@Override
public AggregateIterable<TResult> maxTime(final long maxTime, final TimeUnit timeUnit) {
notNull("timeUnit", timeUnit);
this.maxTimeMS = TimeUnit.MILLISECONDS.convert(maxTime, timeUnit);
return this;
}
@Override
@SuppressWarnings("deprecation")
public AggregateIterable<TResult> useCursor(@Nullable final Boolean useCursor) {
this.useCursor = useCursor;
return this;
}
@Override
public AggregateIterable<TResult> maxAwaitTime(final long maxAwaitTime, final TimeUnit timeUnit) {
notNull("timeUnit", timeUnit);
this.maxAwaitTimeMS = TimeUnit.MILLISECONDS.convert(maxAwaitTime, timeUnit);
return this;
}
@Override
public AggregateIterable<TResult> bypassDocumentValidation(@Nullable final Boolean bypassDocumentValidation) {
this.bypassDocumentValidation = bypassDocumentValidation;
return this;
}
@Override
public AggregateIterable<TResult> collation(@Nullable final Collation collation) {
this.collation = collation;
return this;
}
@Override
public AggregateIterable<TResult> comment(@Nullable final String comment) {
this.comment = comment;
return this;
}
@Override
public AggregateIterable<TResult> hint(@Nullable final Bson hint) {
this.hint = hint;
return this;
}
@Override
@SuppressWarnings("deprecation")
public ReadOperation<BatchCursor<TResult>> asReadOperation() {
MongoNamespace outNamespace = getOutNamespace();
if (outNamespace != null) {
getExecutor().execute(operations.aggregateToCollection(pipeline, maxTimeMS, allowDiskUse, bypassDocumentValidation, collation,
hint, comment, aggregationLevel), getReadConcern(), getClientSession());
FindOptions findOptions = new FindOptions().collation(collation);
Integer batchSize = getBatchSize();
if (batchSize != null) {
findOptions.batchSize(batchSize);
}
return operations.find(outNamespace, new BsonDocument(), resultClass, findOptions);
} else {
return operations.aggregate(pipeline, resultClass, maxTimeMS, maxAwaitTimeMS, getBatchSize(), collation,
hint, comment, allowDiskUse, useCursor, aggregationLevel);
}
}
@Nullable
private MongoNamespace getOutNamespace() {
if (pipeline.size() == 0) {
return null;
}
Bson lastStage = notNull("last stage", pipeline.get(pipeline.size() - 1));
BsonDocument lastStageDocument = lastStage.toBsonDocument(documentClass, codecRegistry);
if (lastStageDocument.containsKey("$out")) {
return new MongoNamespace(namespace.getDatabaseName(), lastStageDocument.getString("$out").getValue());
} else if (lastStageDocument.containsKey("$merge")) {
if (lastStageDocument.isString("$merge")) {
return new MongoNamespace(namespace.getDatabaseName(), lastStageDocument.getString("$merge").getValue());
} else if (lastStageDocument.isDocument("$merge")) {
BsonDocument mergeDocument = lastStageDocument.getDocument("$merge");
if (mergeDocument.isDocument("into")) {
BsonDocument intoDocument = mergeDocument.getDocument("into");
return new MongoNamespace(intoDocument.getString("db", new BsonString(namespace.getDatabaseName())).getValue(),
intoDocument.getString("coll").getValue());
} else if (mergeDocument.isString("into")) {
return new MongoNamespace(namespace.getDatabaseName(), mergeDocument.getString("into").getValue());
}
} else {
throw new IllegalStateException("Cannot return a cursor when the value for $merge stage is not a string or a document");
}
}
return null;
}
}