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‎source/includes/fundamentals/code-snippets/AggTour.java

Lines changed: 73 additions & 71 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,7 @@
11
package docs.aggregation;
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// Hello codeowners
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35
// begin imports
46
import com.mongodb.client.MongoClient;
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import com.mongodb.client.MongoClients;
@@ -20,81 +22,81 @@
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// begin class intro
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// begin connection
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public class AggTour {
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public static void main(String[] args) {
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// Replace the uri string with your MongoDB deployment's connection string
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final String uri = "<connection string>";
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MongoClient mongoClient = MongoClients.create(uri);
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MongoDatabase database = mongoClient.getDatabase("aggregation");
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MongoCollection<Document> collection = database.getCollection("restaurants");
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// end connection
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public static void main(String[] args) {
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// Replace the uri string with your MongoDB deployment's connection string
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final String uri = "<connection string>";
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MongoClient mongoClient = MongoClients.create(uri);
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MongoDatabase database = mongoClient.getDatabase("aggregation");
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MongoCollection<Document> collection = database.getCollection("restaurants");
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// end connection
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collection.drop();
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// Inserts sample documents describing restaurants
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// begin insert
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collection.insertMany(Arrays.asList(
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new Document("name", "Sun Bakery Trattoria").append("contact", new Document().append("phone", "386-555-0189").append("email", "[email protected]").append("location", Arrays.asList(-74.0056649, 40.7452371))).append("stars", 4).append("categories", Arrays.asList("Pizza", "Pasta", "Italian", "Coffee", "Sandwiches")),
38-
new Document("name", "Blue Bagels Grill").append("contact", new Document().append("phone", "786-555-0102").append("email", "[email protected]").append("location", Arrays.asList(-73.92506, 40.8275556))).append("stars", 3).append("categories", Arrays.asList("Bagels", "Cookies", "Sandwiches")),
39-
new Document("name", "XYZ Bagels Restaurant").append("contact", new Document().append("phone", "435-555-0190").append("email", "[email protected]").append("location", Arrays.asList(-74.0707363, 40.59321569999999))).append("stars", 4).append("categories", Arrays.asList("Bagels", "Sandwiches", "Coffee")),
40-
new Document("name", "Hot Bakery Cafe").append("contact", new Document().append("phone", "264-555-0171").append("email", "[email protected]").append("location", Arrays.asList(-73.96485799999999, 40.761899))).append("stars", 4).append("categories", Arrays.asList("Bakery", "Cafe", "Coffee", "Dessert")),
41-
new Document("name", "Green Feast Pizzeria").append("contact", new Document().append("phone", "840-555-0102").append("email", "[email protected]").append("location", Arrays.asList(-74.1220973, 40.6129407))).append("stars", 2).append("categories", Arrays.asList("Pizza", "Italian")),
42-
new Document("name", "ZZZ Pasta Buffet").append("contact", new Document().append("phone", "769-555-0152").append("email", "[email protected]").append("location", Arrays.asList(-73.9446421, 40.7253944))).append("stars", 0).append("categories", Arrays.asList("Pasta", "Italian", "Buffet", "Cafeteria")),
43-
new Document("name", "XYZ Coffee Bar").append("contact", new Document().append("phone", "644-555-0193").append("email", "[email protected]").append("location", Arrays.asList(-74.0166091, 40.6284767))).append("stars", 5).append("categories", Arrays.asList("Coffee", "Cafe", "Bakery", "Chocolates")),
44-
new Document("name", "456 Steak Restaurant").append("contact", new Document().append("phone", "990-555-0165").append("email", "[email protected]").append("location", Arrays.asList(-73.9365108, 40.8497077))).append("stars", 0).append("categories", Arrays.asList("Steak", "Seafood")),
45-
new Document("name", "456 Cookies Shop").append("contact", new Document().append("phone", "604-555-0149").append("email", "[email protected]").append("location", Arrays.asList(-73.8850023, 40.7494272))).append("stars", 4).append("categories", Arrays.asList("Bakery", "Cookies", "Cake", "Coffee")),
46-
new Document("name", "XYZ Steak Buffet").append("contact", new Document().append("phone", "229-555-0197").append("email", "[email protected]").append("location", Arrays.asList(-73.9799932, 40.7660886))).append("stars", 3).append("categories", Arrays.asList("Steak", "Salad", "Chinese"))
47-
));
48-
// end insert
34+
collection.drop();
35+
36+
// Inserts sample documents describing restaurants
37+
// begin insert
38+
collection.insertMany(Arrays.asList(
39+
new Document("name", "Sun Bakery Trattoria").append("contact", new Document().append("phone", "386-555-0189").append("email", "[email protected]").append("location", Arrays.asList(-74.0056649, 40.7452371))).append("stars", 4).append("categories", Arrays.asList("Pizza", "Pasta", "Italian", "Coffee", "Sandwiches")),
40+
new Document("name", "Blue Bagels Grill").append("contact", new Document().append("phone", "786-555-0102").append("email", "[email protected]").append("location", Arrays.asList(-73.92506, 40.8275556))).append("stars", 3).append("categories", Arrays.asList("Bagels", "Cookies", "Sandwiches")),
41+
new Document("name", "XYZ Bagels Restaurant").append("contact", new Document().append("phone", "435-555-0190").append("email", "[email protected]").append("location", Arrays.asList(-74.0707363, 40.59321569999999))).append("stars", 4).append("categories", Arrays.asList("Bagels", "Sandwiches", "Coffee")),
42+
new Document("name", "Hot Bakery Cafe").append("contact", new Document().append("phone", "264-555-0171").append("email", "[email protected]").append("location", Arrays.asList(-73.96485799999999, 40.761899))).append("stars", 4).append("categories", Arrays.asList("Bakery", "Cafe", "Coffee", "Dessert")),
43+
new Document("name", "Green Feast Pizzeria").append("contact", new Document().append("phone", "840-555-0102").append("email", "[email protected]").append("location", Arrays.asList(-74.1220973, 40.6129407))).append("stars", 2).append("categories", Arrays.asList("Pizza", "Italian")),
44+
new Document("name", "ZZZ Pasta Buffet").append("contact", new Document().append("phone", "769-555-0152").append("email", "[email protected]").append("location", Arrays.asList(-73.9446421, 40.7253944))).append("stars", 0).append("categories", Arrays.asList("Pasta", "Italian", "Buffet", "Cafeteria")),
45+
new Document("name", "XYZ Coffee Bar").append("contact", new Document().append("phone", "644-555-0193").append("email", "[email protected]").append("location", Arrays.asList(-74.0166091, 40.6284767))).append("stars", 5).append("categories", Arrays.asList("Coffee", "Cafe", "Bakery", "Chocolates")),
46+
new Document("name", "456 Steak Restaurant").append("contact", new Document().append("phone", "990-555-0165").append("email", "[email protected]").append("location", Arrays.asList(-73.9365108, 40.8497077))).append("stars", 0).append("categories", Arrays.asList("Steak", "Seafood")),
47+
new Document("name", "456 Cookies Shop").append("contact", new Document().append("phone", "604-555-0149").append("email", "[email protected]").append("location", Arrays.asList(-73.8850023, 40.7494272))).append("stars", 4).append("categories", Arrays.asList("Bakery", "Cookies", "Cake", "Coffee")),
48+
new Document("name", "XYZ Steak Buffet").append("contact", new Document().append("phone", "229-555-0197").append("email", "[email protected]").append("location", Arrays.asList(-73.9799932, 40.7660886))).append("stars", 3).append("categories", Arrays.asList("Steak", "Salad", "Chinese"))
49+
));
50+
// end insert
4951

50-
// Creates an aggregation pipeline that matches documents, groups them by the "stars" field, and tallies them by distinct values
51-
// begin aggregation basic
52-
collection.aggregate(
53-
Arrays.asList(
54-
Aggregates.match(Filters.eq("categories", "Bakery")),
55-
Aggregates.group("$stars", Accumulators.sum("count", 1))
56-
)
57-
// Prints the result of the aggregation operation as JSON
58-
).forEach(doc -> System.out.println(doc.toJson()));
59-
// end aggregation basic
52+
// Creates an aggregation pipeline that matches documents, groups them by the "stars" field, and tallies them by distinct values
53+
// begin aggregation basic
54+
collection.aggregate(
55+
Arrays.asList(
56+
Aggregates.match(Filters.eq("categories", "Bakery")),
57+
Aggregates.group("$stars", Accumulators.sum("count", 1))
58+
)
59+
// Prints the result of the aggregation operation as JSON
60+
).forEach(doc -> System.out.println(doc.toJson()));
61+
// end aggregation basic
6062

61-
// begin aggregation explain
62-
Document explanation = collection.aggregate(
63-
Arrays.asList(
64-
Aggregates.match(Filters.eq("categories", "Bakery")),
65-
Aggregates.group("$stars", Accumulators.sum("count", 1))
66-
)
67-
).explain(ExplainVerbosity.EXECUTION_STATS);
63+
// begin aggregation explain
64+
Document explanation = collection.aggregate(
65+
Arrays.asList(
66+
Aggregates.match(Filters.eq("categories", "Bakery")),
67+
Aggregates.group("$stars", Accumulators.sum("count", 1))
68+
)
69+
).explain(ExplainVerbosity.EXECUTION_STATS);
6870

69-
String winningPlans = explanation
70-
.getEmbedded(
71-
Arrays.asList("queryPlanner", "winningPlan", "queryPlan"),
72-
Document.class
73-
)
74-
.toJson(JsonWriterSettings.builder().indent(true).build());
71+
String winningPlans = explanation
72+
.getEmbedded(
73+
Arrays.asList("queryPlanner", "winningPlan", "queryPlan"),
74+
Document.class
75+
)
76+
.toJson(JsonWriterSettings.builder().indent(true).build());
7577

76-
System.out.println(winningPlans);
77-
// end aggregation explain
78+
System.out.println(winningPlans);
79+
// end aggregation explain
7880

79-
// Prints the restaurant name and the first value in the "categories" array as a field named "firstCategory"
80-
// begin aggregation expression
81-
collection.aggregate(
82-
Arrays.asList(
83-
Aggregates.project(
84-
Projections.fields(
85-
Projections.excludeId(),
86-
Projections.include("name"),
87-
Projections.computed(
88-
"firstCategory",
89-
new Document(
90-
"$arrayElemAt",
91-
Arrays.asList("$categories", 0)
92-
)
93-
)
94-
)
95-
)
96-
)
97-
).forEach(doc -> System.out.println(doc.toJson()));
98-
// end aggregation expression
99-
}
81+
// Prints the restaurant name and the first value in the "categories" array as a field named "firstCategory"
82+
// begin aggregation expression
83+
collection.aggregate(
84+
Arrays.asList(
85+
Aggregates.project(
86+
Projections.fields(
87+
Projections.excludeId(),
88+
Projections.include("name"),
89+
Projections.computed(
90+
"firstCategory",
91+
new Document(
92+
"$arrayElemAt",
93+
Arrays.asList("$categories", 0)
94+
)
95+
)
96+
)
97+
)
98+
)
99+
).forEach(doc -> System.out.println(doc.toJson()));
100+
// end aggregation expression
101+
}
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}

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