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DATAMONGO-1322 - Polishing.

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Convert lineendings from CRLF to LF. Reduce validator implementations visibility to package. Extend Javadoc. Slight rewording in reference documentation.

Original pull request: #525.
Related pull request: #511.
Related ticket: DATACMNS-1835.
This commit is contained in:
Mark Paluch
2018-01-16 12:03:17 +01:00
parent 36614ef0ab
commit c3dbce4d9e
10 changed files with 239 additions and 245 deletions
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2
spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/CollectionOptions.java
View File

@@ -150,7 +150,7 @@ public class CollectionOptions {
}
/**
* /** Create new {@link CollectionOptions} with already given settings and {@code validationOptions} set to given
* Create new {@link CollectionOptions} with already given settings and {@code validationOptions} set to given
* {@link Validator}.
*
* @param validator can be {@literal null}.

35
spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/MongoTemplate.java
View File

@@ -63,7 +63,6 @@ import org.springframework.data.mapping.context.MappingContext;
import org.springframework.data.mapping.model.ConvertingPropertyAccessor;
import org.springframework.data.mongodb.MongoDbFactory;
import org.springframework.data.mongodb.core.BulkOperations.BulkMode;
import org.springframework.data.mongodb.core.CollectionOptions.ValidationOptions;
import org.springframework.data.mongodb.core.DefaultBulkOperations.BulkOperationContext;
import org.springframework.data.mongodb.core.aggregation.Aggregation;
import org.springframework.data.mongodb.core.aggregation.AggregationOperationContext;
@@ -108,7 +107,6 @@ import org.springframework.data.mongodb.core.query.Meta;
import org.springframework.data.mongodb.core.query.NearQuery;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;
import org.springframework.data.mongodb.core.validation.JsonSchemaValidator;
import org.springframework.data.mongodb.core.validation.Validator;
import org.springframework.data.mongodb.util.MongoClientVersion;
import org.springframework.data.projection.ProjectionInformation;
@@ -141,16 +139,7 @@ import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.MongoIterable;
import com.mongodb.client.model.CountOptions;
import com.mongodb.client.model.CreateCollectionOptions;
import com.mongodb.client.model.DeleteOptions;
import com.mongodb.client.model.Filters;
import com.mongodb.client.model.FindOneAndDeleteOptions;
import com.mongodb.client.model.FindOneAndUpdateOptions;
import com.mongodb.client.model.ReturnDocument;
import com.mongodb.client.model.UpdateOptions;
import com.mongodb.client.model.ValidationAction;
import com.mongodb.client.model.ValidationLevel;
import com.mongodb.client.model.*;
import com.mongodb.client.result.DeleteResult;
import com.mongodb.client.result.UpdateResult;
import com.mongodb.util.JSONParseException;
@@ -2385,11 +2374,12 @@ public class MongoTemplate implements MongoOperations, ApplicationContextAware,
Document doc = convertToDocument(collectionOptions);
if (collectionOptions != null && collectionOptions.getValidationOptions().isPresent()) {
if (collectionOptions != null) {
ValidationOptions v = collectionOptions.getValidationOptions().get();
v.getValidator().ifPresent(val -> doc.put("validator", getMappedValidator(val, targetType)));
collectionOptions.getValidationOptions().ifPresent(it -> it.getValidator() //
.ifPresent(val -> doc.put("validator", getMappedValidator(val, targetType))));
}
return doc;
}
@@ -2402,6 +2392,7 @@ public class MongoTemplate implements MongoOperations, ApplicationContextAware,
protected Document convertToDocument(@Nullable CollectionOptions collectionOptions) {
Document document = new Document();
if (collectionOptions != null) {
collectionOptions.getCapped().ifPresent(val -> document.put("capped", val));
@@ -2409,14 +2400,14 @@ public class MongoTemplate implements MongoOperations, ApplicationContextAware,
collectionOptions.getMaxDocuments().ifPresent(val -> document.put("max", val));
collectionOptions.getCollation().ifPresent(val -> document.append("collation", val.toDocument()));
if (collectionOptions.getValidationOptions().isPresent()) {
collectionOptions.getValidationOptions().ifPresent(it -> {
CollectionOptions.ValidationOptions v = collectionOptions.getValidationOptions().get();
v.getValidationLevel().ifPresent(val -> document.append("validationLevel", val.getValue()));
v.getValidationAction().ifPresent(val -> document.append("validationAction", val.getValue()));
v.getValidator().ifPresent(val -> document.append("validator", getMappedValidator(val, Object.class)));
}
it.getValidationLevel().ifPresent(val -> document.append("validationLevel", val.getValue()));
it.getValidationAction().ifPresent(val -> document.append("validationAction", val.getValue()));
it.getValidator().ifPresent(val -> document.append("validator", getMappedValidator(val, Object.class)));
});
}
return document;
}
@@ -2424,7 +2415,7 @@ public class MongoTemplate implements MongoOperations, ApplicationContextAware,
Document validationRules = validator.toDocument();
if (validator instanceof JsonSchemaValidator || validationRules.containsKey("$jsonSchema")) {
if (validationRules.containsKey("$jsonSchema")) {
return schemaMapper.mapSchema(validationRules, domainType);
}

5
spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ReactiveMongoTemplate.java
View File

@@ -100,7 +100,6 @@ import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.NearQuery;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;
import org.springframework.data.mongodb.core.validation.JsonSchemaValidator;
import org.springframework.data.mongodb.core.validation.Validator;
import org.springframework.data.mongodb.util.MongoClientVersion;
import org.springframework.data.projection.ProjectionInformation;
@@ -2033,11 +2032,11 @@ public class ReactiveMongoTemplate implements ReactiveMongoOperations, Applicati
return result;
}
Document getMappedValidator(Validator validator, Class<?> domainType) {
private Document getMappedValidator(Validator validator, Class<?> domainType) {
Document validationRules = validator.toDocument();
if (validator instanceof JsonSchemaValidator || validationRules.containsKey("$jsonSchema")) {
if (validationRules.containsKey("$jsonSchema")) {
return schemaMapper.mapSchema(validationRules, domainType);
}

150
spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/validation/CriteriaValidator.java
View File

@@ -1,75 +1,75 @@
/*
* Copyright 2018 the original author or authors.
*
* 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 org.springframework.data.mongodb.core.validation;
import lombok.AccessLevel;
import lombok.EqualsAndHashCode;
import lombok.RequiredArgsConstructor;
import org.bson.Document;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.CriteriaDefinition;
import org.springframework.data.mongodb.core.query.SerializationUtils;
import org.springframework.util.Assert;
/**
* {@link Validator} implementation based on {@link CriteriaDefinition query expressions}.
*
* @author Andreas Zink
* @author Christoph Strobl
* @since 2.1
* @see Criteria
* @see <a href="https://docs.mongodb.com/manual/core/schema-validation/#query-expressions">Schema Validation</a>
*/
@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
@EqualsAndHashCode
public class CriteriaValidator implements Validator {
private final CriteriaDefinition criteria;
/**
* Creates a new {@link Validator} object, which is basically setup of query operators, based on a
* {@link CriteriaDefinition} instance.
*
* @param criteria the criteria to build the {@code validator} from. Must not be {@literal null}.
* @return new instance of {@link CriteriaValidator}.
* @throws IllegalArgumentException when criteria is {@literal null}.
*/
public static CriteriaValidator of(CriteriaDefinition criteria) {
Assert.notNull(criteria, "Criteria must not be null!");
return new CriteriaValidator(criteria);
}
/*
* (non-Javadoc)
* @see org.springframework.data.mongodb.core.validation.Validator#toDocument()
*/
@Override
public Document toDocument() {
return criteria.getCriteriaObject();
}
/*
* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return SerializationUtils.serializeToJsonSafely(toDocument());
}
}
/*
* Copyright 2018 the original author or authors.
*
* 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 org.springframework.data.mongodb.core.validation;
import lombok.AccessLevel;
import lombok.EqualsAndHashCode;
import lombok.RequiredArgsConstructor;
import org.bson.Document;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.CriteriaDefinition;
import org.springframework.data.mongodb.core.query.SerializationUtils;
import org.springframework.util.Assert;
/**
* {@link Validator} implementation based on {@link CriteriaDefinition query expressions}.
*
* @author Andreas Zink
* @author Christoph Strobl
* @since 2.1
* @see Criteria
* @see <a href="https://docs.mongodb.com/manual/core/schema-validation/#query-expressions">Schema Validation</a>
*/
@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
@EqualsAndHashCode
class CriteriaValidator implements Validator {
private final CriteriaDefinition criteria;
/**
* Creates a new {@link Validator} object, which is basically setup of query operators, based on a
* {@link CriteriaDefinition} instance.
*
* @param criteria the criteria to build the {@code validator} from. Must not be {@literal null}.
* @return new instance of {@link CriteriaValidator}.
* @throws IllegalArgumentException when criteria is {@literal null}.
*/
static CriteriaValidator of(CriteriaDefinition criteria) {
Assert.notNull(criteria, "Criteria must not be null!");
return new CriteriaValidator(criteria);
}
/*
* (non-Javadoc)
* @see org.springframework.data.mongodb.core.validation.Validator#toDocument()
*/
@Override
public Document toDocument() {
return criteria.getCriteriaObject();
}
/*
* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return SerializationUtils.serializeToJsonSafely(toDocument());
}
}

11
spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/validation/DocumentValidator.java
View File

@@ -28,25 +28,26 @@ import org.springframework.util.Assert;
* which can be either a {@code $jsonSchema} or query expression.
*
* @author Christoph Strobl
* @author Mark Paluch
* @since 2.1
* @see <a href="https://docs.mongodb.com/manual/core/schema-validation/">Schema Validation</a>
*/
@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
@EqualsAndHashCode
public class DocumentValidator implements Validator {
class DocumentValidator implements Validator {
private final Document validatorObject;
/**
* Create new {@link org.springframework.data.mongodb.core.validation.DocumentValidator} defining validation rules via
* a plain {@link Document}.
* Create new {@link DocumentValidator} defining validation rules via a plain {@link Document}.
*
* @param validatorObject must not be {@literal null}.
* @throws IllegalArgumentException if validatorObject is {@literal null}.
*/
public static DocumentValidator of(Document validatorObject) {
static DocumentValidator of(Document validatorObject) {
Assert.notNull(validatorObject, "ValidatorObject must not be null!");
return new DocumentValidator(new Document(validatorObject));
}
@@ -60,7 +61,7 @@ public class DocumentValidator implements Validator {
}
/*
* (non-Javadoc)
* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override

18
spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/validation/JsonSchemaValidator.java
View File

@@ -28,23 +28,27 @@ import org.springframework.util.Assert;
* {@link Validator} implementation based on {@link MongoJsonSchema JSON Schema}.
*
* @author Christoph Strobl
* @author Mark Paluch
* @since 2.1
* @see <a href="https://docs.mongodb.com/manual/core/schema-validation/#json-schema">Schema Validation</a>
*/
@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
@EqualsAndHashCode
public class JsonSchemaValidator implements Validator {
class JsonSchemaValidator implements Validator {
private final MongoJsonSchema schema;
public static JsonSchemaValidator of(MongoJsonSchema schema) {
/**
* Create new {@link JsonSchemaValidator} defining validation rules via {@link MongoJsonSchema}.
*
* @param schema must not be {@literal null}.
* @throws IllegalArgumentException if schema is {@literal null}.
*/
static JsonSchemaValidator of(MongoJsonSchema schema) {
Assert.notNull(schema, "Schema must not be null!");
return new JsonSchemaValidator(schema);
}
public MongoJsonSchema getSchema() {
return schema;
return new JsonSchemaValidator(schema);
}
/*
@@ -57,7 +61,7 @@ public class JsonSchemaValidator implements Validator {
}
/*
* (non-Javadoc)
* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override

162
spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/validation/Validator.java
View File

@@ -1,81 +1,81 @@
/*
* Copyright 2018 the original author or authors.
*
* 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 org.springframework.data.mongodb.core.validation;
import org.bson.Document;
import org.springframework.data.mongodb.core.query.CriteriaDefinition;
import org.springframework.data.mongodb.core.schema.MongoJsonSchema;
import org.springframework.util.Assert;
/**
* Provides a {@code validator} object to be used for collection validation via
* {@link org.springframework.data.mongodb.core.CollectionOptions.ValidationOptions}.
*
* @author Andreas Zink
* @author Christoph Strobl
* @since 2.1
* @see <a href="https://docs.mongodb.com/manual/reference/method/db.createCollection/">MongoDB Collection Options</a>
*/
public interface Validator {
/**
* Get the {@link Document} containing the validation specific rules. The document may contain fields that may require
* type and/or field name mapping.
*
* @return a MongoDB {@code validator} {@link Document}. Never {@literal null}.
*/
Document toDocument();
/**
* Creates a basic {@link Validator} checking documents against a given set of rules.
*
* @param validationRules must not be {@literal null}.
* @return new instance of {@link Validator}.
* @throws IllegalArgumentException if validationRules is {@literal null}.
*/
static Validator document(Document validationRules) {
Assert.notNull(validationRules, "ValidationRules must not be null!");
return DocumentValidator.of(validationRules);
}
/**
* Creates a new {@link Validator} checking documents against the structure defined in {@link MongoJsonSchema}.
*
* @param schema must not be {@literal null}.
* @return new instance of {@link Validator}.
* @throws IllegalArgumentException if schema is {@literal null}.
*/
static Validator schema(MongoJsonSchema schema) {
Assert.notNull(schema, "Schema must not be null!");
return JsonSchemaValidator.of(schema);
}
/**
* Creates a new {@link Validator} checking documents against a given query structure expressed by
* {@link CriteriaDefinition}. <br />
*
* @param criteria must not be {@literal null}.
* @return new instance of {@link Validator}.
* @throws IllegalArgumentException if criteria is {@literal null}.
*/
static Validator criteria(CriteriaDefinition criteria) {
Assert.notNull(criteria, "Criteria must not be null!");
return CriteriaValidator.of(criteria);
}
}
/*
* Copyright 2018 the original author or authors.
*
* 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 org.springframework.data.mongodb.core.validation;
import org.bson.Document;
import org.springframework.data.mongodb.core.query.CriteriaDefinition;
import org.springframework.data.mongodb.core.schema.MongoJsonSchema;
import org.springframework.util.Assert;
/**
* Provides a {@code validator} object to be used for collection validation via
* {@link org.springframework.data.mongodb.core.CollectionOptions.ValidationOptions}.
*
* @author Andreas Zink
* @author Christoph Strobl
* @since 2.1
* @see <a href="https://docs.mongodb.com/manual/reference/method/db.createCollection/">MongoDB Collection Options</a>
*/
public interface Validator {
/**
* Get the {@link Document} containing the validation specific rules. The document may contain fields that may require
* type and/or field name mapping.
*
* @return a MongoDB {@code validator} {@link Document}. Never {@literal null}.
*/
Document toDocument();
/**
* Creates a basic {@link Validator} checking documents against a given set of rules.
*
* @param validationRules must not be {@literal null}.
* @return new instance of {@link Validator}.
* @throws IllegalArgumentException if validationRules is {@literal null}.
*/
static Validator document(Document validationRules) {
Assert.notNull(validationRules, "ValidationRules must not be null!");
return DocumentValidator.of(validationRules);
}
/**
* Creates a new {@link Validator} checking documents against the structure defined in {@link MongoJsonSchema}.
*
* @param schema must not be {@literal null}.
* @return new instance of {@link Validator}.
* @throws IllegalArgumentException if schema is {@literal null}.
*/
static Validator schema(MongoJsonSchema schema) {
Assert.notNull(schema, "Schema must not be null!");
return JsonSchemaValidator.of(schema);
}
/**
* Creates a new {@link Validator} checking documents against a given query structure expressed by
* {@link CriteriaDefinition}. <br />
*
* @param criteria must not be {@literal null}.
* @return new instance of {@link Validator}.
* @throws IllegalArgumentException if criteria is {@literal null}.
*/
static Validator criteria(CriteriaDefinition criteria) {
Assert.notNull(criteria, "Criteria must not be null!");
return CriteriaValidator.of(criteria);
}
}

5
spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/MongoTemplateValidationTests.java
View File

@@ -36,7 +36,6 @@ import org.springframework.data.mongodb.config.AbstractMongoConfiguration;
import org.springframework.data.mongodb.core.CollectionOptions.ValidationOptions;
import org.springframework.data.mongodb.core.mapping.Field;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.validation.DocumentValidator;
import org.springframework.data.mongodb.test.util.MongoVersionRule;
import org.springframework.data.util.Version;
import org.springframework.lang.Nullable;
@@ -48,7 +47,8 @@ import com.mongodb.client.model.ValidationLevel;
/**
* Integration tests for {@link CollectionOptions#validation(ValidationOptions)} using
* {@link org.springframework.data.mongodb.core.validation.CriteriaValidator} and {@link DocumentValidator}.
* {@link org.springframework.data.mongodb.core.validation.CriteriaValidator} and
* {@link org.springframework.data.mongodb.core.validation.DocumentValidator}.
*
* @author Andreas Zink
* @author Christoph Strobl
@@ -212,5 +212,4 @@ public class MongoTemplateValidationTests {
private @Nullable Integer rangedInteger;
private @Field("customName") Object customFieldName;
}
}

94
spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/validation/CriteriaValidatorUnitTests.java
View File

@@ -1,47 +1,47 @@
/*
* Copyright 2017 the original author or authors.
*
* 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 org.springframework.data.mongodb.core.validation;
import static org.assertj.core.api.Assertions.assertThat;
import org.bson.Document;
import org.junit.Test;
import org.springframework.data.mongodb.core.query.Criteria;
/**
* Unit tests for {@link CriteriaValidator}.
*
* @author Andreas Zink
* @author Christoph Strobl
*/
public class CriteriaValidatorUnitTests {
@Test // DATAMONGO-1322
public void testSimpleCriteria() {
Criteria criteria = Criteria.where("nonNullString").ne(null).type(2).and("rangedInteger").type(16).gte(0).lte(122);
Document validator = CriteriaValidator.of(criteria).toDocument();
assertThat(validator.get("nonNullString")).isEqualTo(new Document("$ne", null).append("$type", 2));
assertThat(validator.get("rangedInteger"))
.isEqualTo(new Document("$type", 16).append("$gte", 0).append("$lte", 122));
}
@Test(expected = IllegalArgumentException.class) // DATAMONGO-1322
public void testFailOnNull() {
CriteriaValidator.of(null);
}
}
/*
* Copyright 2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.mongodb.core.validation;
import static org.assertj.core.api.Assertions.*;
import org.bson.Document;
import org.junit.Test;
import org.springframework.data.mongodb.core.query.Criteria;
/**
* Unit tests for {@link CriteriaValidator}.
*
* @author Andreas Zink
* @author Christoph Strobl
*/
public class CriteriaValidatorUnitTests {
@Test // DATAMONGO-1322
public void testSimpleCriteria() {
Criteria criteria = Criteria.where("nonNullString").ne(null).type(2).and("rangedInteger").type(16).gte(0).lte(122);
Document validator = CriteriaValidator.of(criteria).toDocument();
assertThat(validator.get("nonNullString")).isEqualTo(new Document("$ne", null).append("$type", 2));
assertThat(validator.get("rangedInteger"))
.isEqualTo(new Document("$type", 16).append("$gte", 0).append("$lte", 122));
}
@Test(expected = IllegalArgumentException.class) // DATAMONGO-1322
public void testFailOnNull() {
CriteriaValidator.of(null);
}
}

2
src/main/asciidoc/reference/mongo-3.adoc
View File

@@ -99,7 +99,7 @@ Spring Data MongoDB supports MongoDB's specific JSON schema implementation to de
[[mongo.mongo-3.validation.query-expression]]
==== Query Expression Validation
Next to the <<mongo.mongo-3.validation.json-schema>> as of version 3.2 MongoDB supports validating documents against a given query structure. The structure can be built using `Criteria` objects just the same way as they are used for defining queries.
Next to the <<mongo.mongo-3.validation.json-schema>>, MongoDB supports as of version 3.2 validating documents against a given structure described by a query. The structure can be built using `Criteria` objects just the same way as they are used for defining queries.
[source,java]
----