forked from mongodb/mongo-java-driver
/
AggregateIterableImpl.java
258 lines (227 loc) · 11.7 KB
/
AggregateIterableImpl.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/*
* 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.ExplainVerbosity;
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.Collation;
import com.mongodb.internal.client.model.AggregationLevel;
import com.mongodb.internal.client.model.FindOptions;
import com.mongodb.internal.operation.BatchCursor;
import com.mongodb.internal.operation.ExplainableReadOperation;
import com.mongodb.internal.operation.ReadOperation;
import com.mongodb.internal.operation.SyncOperations;
import com.mongodb.lang.Nullable;
import org.bson.BsonDocument;
import org.bson.BsonString;
import org.bson.Document;
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 bypassDocumentValidation;
private Collation collation;
private String comment;
private Bson hint;
private Bson variables;
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() {
BsonDocument lastPipelineStage = getLastPipelineStage();
if (lastPipelineStage == null || !lastPipelineStage.containsKey("$out") && !lastPipelineStage.containsKey("$merge")) {
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, variables, 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
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
public AggregateIterable<TResult> let(@Nullable final Bson variables) {
this.variables = variables;
return this;
}
@Override
public Document explain() {
return executeExplain(Document.class, null);
}
@Override
public Document explain(final ExplainVerbosity verbosity) {
return executeExplain(Document.class, notNull("verbosity", verbosity));
}
@Override
public <E> E explain(final Class<E> explainDocumentClass) {
return executeExplain(explainDocumentClass, null);
}
@Override
public <E> E explain(final Class<E> explainResultClass, final ExplainVerbosity verbosity) {
return executeExplain(explainResultClass, notNull("verbosity", verbosity));
}
private <E> E executeExplain(final Class<E> explainResultClass, @Nullable final ExplainVerbosity verbosity) {
notNull("explainDocumentClass", explainResultClass);
return getExecutor().execute(asAggregateOperation().asExplainableOperation(verbosity, codecRegistry.get(explainResultClass)),
getReadPreference(), getReadConcern(), getClientSession());
}
@Override
public ReadOperation<BatchCursor<TResult>> asReadOperation() {
MongoNamespace outNamespace = getOutNamespace();
if (outNamespace != null) {
getExecutor().execute(operations.aggregateToCollection(pipeline, maxTimeMS, allowDiskUse, bypassDocumentValidation, collation,
hint, comment, variables, 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 asAggregateOperation();
}
}
private ExplainableReadOperation<BatchCursor<TResult>> asAggregateOperation() {
return operations.aggregate(pipeline, resultClass, maxTimeMS, maxAwaitTimeMS, getBatchSize(), collation,
hint, comment, variables, allowDiskUse, aggregationLevel);
}
@Nullable
private BsonDocument getLastPipelineStage() {
if (pipeline.isEmpty()) {
return null;
} else {
Bson lastStage = notNull("last pipeline stage", pipeline.get(pipeline.size() - 1));
return lastStage.toBsonDocument(documentClass, codecRegistry);
}
}
@Nullable
private MongoNamespace getOutNamespace() {
BsonDocument lastPipelineStage = getLastPipelineStage();
if (lastPipelineStage == null) {
return null;
}
if (lastPipelineStage.containsKey("$out")) {
if (lastPipelineStage.get("$out").isString()) {
return new MongoNamespace(namespace.getDatabaseName(), lastPipelineStage.getString("$out").getValue());
} else if (lastPipelineStage.get("$out").isDocument()) {
BsonDocument outDocument = lastPipelineStage.getDocument("$out");
if (!outDocument.containsKey("db") || !outDocument.containsKey("coll")) {
throw new IllegalStateException("Cannot return a cursor when the value for $out stage is not a namespace document");
}
return new MongoNamespace(outDocument.getString("db").getValue(), outDocument.getString("coll").getValue());
} else {
throw new IllegalStateException("Cannot return a cursor when the value for $out stage "
+ "is not a string or namespace document");
}
} else if (lastPipelineStage.containsKey("$merge")) {
if (lastPipelineStage.isString("$merge")) {
return new MongoNamespace(namespace.getDatabaseName(), lastPipelineStage.getString("$merge").getValue());
} else if (lastPipelineStage.isDocument("$merge")) {
BsonDocument mergeDocument = lastPipelineStage.getDocument("$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;
}
}