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144 changes: 73 additions & 71 deletions source/includes/fundamentals/code-snippets/AggTour.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
package docs.aggregation;

// Hello codeowners

// begin imports
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
Expand All @@ -20,81 +22,81 @@
// begin class intro
// begin connection
public class AggTour {
public static void main(String[] args) {
// Replace the uri string with your MongoDB deployment's connection string
final String uri = "<connection string>";
MongoClient mongoClient = MongoClients.create(uri);
MongoDatabase database = mongoClient.getDatabase("aggregation");
MongoCollection<Document> collection = database.getCollection("restaurants");
// end connection
public static void main(String[] args) {
// Replace the uri string with your MongoDB deployment's connection string
final String uri = "<connection string>";
MongoClient mongoClient = MongoClients.create(uri);
MongoDatabase database = mongoClient.getDatabase("aggregation");
MongoCollection<Document> collection = database.getCollection("restaurants");
// end connection

collection.drop();
// Inserts sample documents describing restaurants
// begin insert
collection.insertMany(Arrays.asList(
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")),
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")),
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")),
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")),
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")),
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")),
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")),
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")),
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")),
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"))
));
// end insert
collection.drop();
// Inserts sample documents describing restaurants
// begin insert
collection.insertMany(Arrays.asList(
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")),
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")),
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")),
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")),
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")),
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")),
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")),
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")),
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")),
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"))
));
// end insert

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

// begin aggregation explain
Document explanation = collection.aggregate(
Arrays.asList(
Aggregates.match(Filters.eq("categories", "Bakery")),
Aggregates.group("$stars", Accumulators.sum("count", 1))
)
).explain(ExplainVerbosity.EXECUTION_STATS);
// begin aggregation explain
Document explanation = collection.aggregate(
Arrays.asList(
Aggregates.match(Filters.eq("categories", "Bakery")),
Aggregates.group("$stars", Accumulators.sum("count", 1))
)
).explain(ExplainVerbosity.EXECUTION_STATS);

String winningPlans = explanation
.getEmbedded(
Arrays.asList("queryPlanner", "winningPlan", "queryPlan"),
Document.class
)
.toJson(JsonWriterSettings.builder().indent(true).build());
String winningPlans = explanation
.getEmbedded(
Arrays.asList("queryPlanner", "winningPlan", "queryPlan"),
Document.class
)
.toJson(JsonWriterSettings.builder().indent(true).build());

System.out.println(winningPlans);
// end aggregation explain
System.out.println(winningPlans);
// end aggregation explain

// Prints the restaurant name and the first value in the "categories" array as a field named "firstCategory"
// begin aggregation expression
collection.aggregate(
Arrays.asList(
Aggregates.project(
Projections.fields(
Projections.excludeId(),
Projections.include("name"),
Projections.computed(
"firstCategory",
new Document(
"$arrayElemAt",
Arrays.asList("$categories", 0)
)
)
)
)
)
).forEach(doc -> System.out.println(doc.toJson()));
// end aggregation expression
}
// Prints the restaurant name and the first value in the "categories" array as a field named "firstCategory"
// begin aggregation expression
collection.aggregate(
Arrays.asList(
Aggregates.project(
Projections.fields(
Projections.excludeId(),
Projections.include("name"),
Projections.computed(
"firstCategory",
new Document(
"$arrayElemAt",
Arrays.asList("$categories", 0)
)
)
)
)
)
).forEach(doc -> System.out.println(doc.toJson()));
// end aggregation expression
}
}
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