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| 1 | +/* |
| 2 | + * Copyright 2008-present MongoDB, Inc. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +package com.mongodb.client.model.expressions; |
| 18 | + |
| 19 | +import com.mongodb.MongoClientSettings; |
| 20 | +import com.mongodb.client.AggregateIterable; |
| 21 | +import com.mongodb.client.MongoClient; |
| 22 | +import com.mongodb.client.MongoClients; |
| 23 | +import com.mongodb.client.MongoCollection; |
| 24 | +import com.mongodb.client.model.Aggregates; |
| 25 | +import com.mongodb.client.model.Filters; |
| 26 | +import org.bson.Document; |
| 27 | +import org.bson.conversions.Bson; |
| 28 | +import org.junit.jupiter.api.AfterEach; |
| 29 | +import org.junit.jupiter.api.BeforeEach; |
| 30 | +import org.junit.jupiter.api.Test; |
| 31 | + |
| 32 | +import java.util.ArrayList; |
| 33 | +import java.util.Arrays; |
| 34 | +import java.util.List; |
| 35 | + |
| 36 | +import static com.mongodb.client.model.Accumulators.sum; |
| 37 | +import static com.mongodb.client.model.Aggregates.match; |
| 38 | +import static com.mongodb.client.model.Aggregates.project; |
| 39 | +import static com.mongodb.client.model.Projections.computed; |
| 40 | +import static com.mongodb.client.model.Projections.excludeId; |
| 41 | +import static com.mongodb.client.model.Projections.fields; |
| 42 | +import static com.mongodb.client.model.Projections.include; |
| 43 | +import static com.mongodb.client.model.Sorts.ascending; |
| 44 | +import static com.mongodb.client.model.expressions.Expressions.current; |
| 45 | +import static com.mongodb.client.model.expressions.Expressions.of; |
| 46 | +import static com.mongodb.client.model.expressions.Expressions.ofArray; |
| 47 | +import static org.junit.jupiter.api.Assertions.assertEquals; |
| 48 | + |
| 49 | +class InContextExpressionsFunctionalTest extends AbstractExpressionsFunctionalTest { |
| 50 | + |
| 51 | + private MongoClient client; |
| 52 | + private MongoCollection<Document> col; |
| 53 | + |
| 54 | + @BeforeEach |
| 55 | + public void setUp() { |
| 56 | + client = MongoClients.create(); |
| 57 | + col = client.getDatabase("testdb").getCollection("testcol"); |
| 58 | + col.drop(); |
| 59 | + } |
| 60 | + |
| 61 | + @AfterEach |
| 62 | + public void tearDown() { |
| 63 | + client.close(); |
| 64 | + } |
| 65 | + |
| 66 | + private String bsonToString(final Bson project) { |
| 67 | + return project.toBsonDocument(Document.class, MongoClientSettings.getDefaultCodecRegistry()).toString().replaceAll("\"", "'"); |
| 68 | + } |
| 69 | + |
| 70 | + private List<Document> aggregate(final Bson... stages) { |
| 71 | + AggregateIterable<Document> result = col.aggregate(Arrays.asList(stages)); |
| 72 | + List<Document> results = new ArrayList<>(); |
| 73 | + result.forEach(r -> results.add(r)); |
| 74 | + return results; |
| 75 | + } |
| 76 | + |
| 77 | + @Test |
| 78 | + public void matchTest() { |
| 79 | + col.insertMany(Arrays.asList( |
| 80 | + Document.parse("{_id: 1, x: 0, y: 2}"), |
| 81 | + Document.parse("{_id: 2, x: 0, y: 3}"), |
| 82 | + Document.parse("{_id: 3, x: 1, y: 3}"))); |
| 83 | + |
| 84 | + List<Document> results = aggregate( |
| 85 | + match(Filters.expr(current().getInteger("x").eq(of(1))))); |
| 86 | + |
| 87 | + assertEquals( |
| 88 | + Arrays.asList(Document.parse("{_id: 3, x: 1, y: 3}")), |
| 89 | + results); |
| 90 | + } |
| 91 | + |
| 92 | + @Test |
| 93 | + public void projectTest() { |
| 94 | + col.insertMany(Arrays.asList( |
| 95 | + Document.parse("{_id: 1, x: 0, y: 2}"))); |
| 96 | + |
| 97 | + List<Document> expected = Arrays.asList(Document.parse("{_id: 1, x: 0, c: 2}")); |
| 98 | + |
| 99 | + // old, using "$y" |
| 100 | + Bson projectOld = project(fields(include("x"), computed("c", |
| 101 | + "$y"))); |
| 102 | + assertEquals("{'$project': {'x': 1, 'c': '$y'}}", bsonToString(projectOld)); |
| 103 | + assertEquals(expected, |
| 104 | + aggregate(projectOld)); |
| 105 | + |
| 106 | + // new, using current() with add/subtract |
| 107 | + Bson projectNew = project(fields(include("x"), computed("c", |
| 108 | + current().getInteger("y").add(10).subtract(10)))); |
| 109 | + assertEquals( |
| 110 | + "{'$project': {'x': 1, 'c': " |
| 111 | + + "{'$subtract': [{'$add': [{'$getField': " |
| 112 | + + "{'input': '$$CURRENT', 'field': 'y'}}, 10]}, 10]}}}", |
| 113 | + bsonToString(projectNew)); |
| 114 | + assertEquals(expected, |
| 115 | + aggregate(projectNew)); |
| 116 | + } |
| 117 | + |
| 118 | + @Test |
| 119 | + public void projectTest2() { |
| 120 | + col.insertMany(Arrays.asList(Document.parse("{_id: 0, x: 1}"))); |
| 121 | + |
| 122 | + // new, nestedArray |
| 123 | + Bson projectNestedArray = project(fields(excludeId(), computed("nestedArray", ofArray( |
| 124 | + current().getInteger("x").max(of(4)), |
| 125 | + current().getInteger("x"), |
| 126 | + of(0), of(1), of(true), of(false) |
| 127 | + )))); |
| 128 | + assertEquals( |
| 129 | + Arrays.asList(Document.parse("{ nestedArray: [ 4, 1, 0, 1, true, false ] }")), |
| 130 | + aggregate(projectNestedArray)); |
| 131 | + |
| 132 | + // new, document |
| 133 | + Bson projectDocument = project(fields(computed("nested", |
| 134 | + //BsonDocument.parse("{ x: {$max : ['$x', 4] }}") |
| 135 | + of(new Document()).setField("x", current().getInteger("x").max(of(4))) |
| 136 | + ))); |
| 137 | + assertEquals( |
| 138 | + Arrays.asList(Document.parse("{_id: 0, nested: { x: 4 } }")), |
| 139 | + aggregate(projectDocument)); |
| 140 | + } |
| 141 | + |
| 142 | + @Test |
| 143 | + public void groupTest() { |
| 144 | + col.insertMany(Arrays.asList( |
| 145 | + Document.parse("{t: 0, a: 1}"), |
| 146 | + Document.parse("{t: 0, a: 2}"), |
| 147 | + Document.parse("{t: 1, a: 9}"))); |
| 148 | + |
| 149 | + List<Document> results = aggregate( |
| 150 | + Aggregates.group( |
| 151 | + current().getInteger("t").add(of(100)), |
| 152 | + sum("sum", current().getInteger("a").add(1))), |
| 153 | + Aggregates.sort(ascending("_id"))); |
| 154 | + assertEquals( |
| 155 | + Arrays.asList( |
| 156 | + Document.parse("{_id: 100, sum: 5}"), |
| 157 | + Document.parse("{_id: 101, sum: 10}")), |
| 158 | + results); |
| 159 | + } |
| 160 | +} |
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