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/*
* Copyright 2013-2022 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
*
* https://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.aggregation;
import org.bson.Document;
import org.springframework.data.mongodb.core.query.CriteriaDefinition;
import org.springframework.util.Assert;
/**
* Encapsulates the {@code $match}-operation.
*
* We recommend to use the static factory method
* {@link Aggregation#match(org.springframework.data.mongodb.core.query.Criteria)} instead of creating instances of this
* class directly.
*
* @author Sebastian Herold
* @author Thomas Darimont
* @author Oliver Gierke
* @author Divya Srivastava
* @since 1.3
* @see MongoDB Aggregation Framework:
* $match
*/
public class MatchOperation implements AggregationOperation {
private final CriteriaDefinition criteriaDefinition;
private final AggregationExpression expression;
/**
* Creates a new {@link MatchOperation} for the given {@link CriteriaDefinition}.
*
* @param criteriaDefinition must not be {@literal null}.
*/
public MatchOperation(CriteriaDefinition criteriaDefinition) {
Assert.notNull(criteriaDefinition, "Criteria must not be null!");
this.criteriaDefinition = criteriaDefinition;
this.expression = null;
}
/**
* Creates a new {@link MatchOperation} for the given {@link AggregationExpression}.
*
* @param expression must not be {@literal null}.
* @since 3.3
*/
public MatchOperation(AggregationExpression expression) {
Assert.notNull(expression, "Expression must not be null!");
this.criteriaDefinition = null;
this.expression = expression;
}
/*
* (non-Javadoc)
* @see org.springframework.data.mongodb.core.aggregation.AggregationOperation#toDocument(org.springframework.data.mongodb.core.aggregation.AggregationOperationContext)
*/
@Override
public Document toDocument(AggregationOperationContext context) {
return new Document(getOperator(),
context.getMappedObject(expression != null ? expression.toDocument() : criteriaDefinition.getCriteriaObject()));
}
/*
* (non-Javadoc)
* @see org.springframework.data.mongodb.core.aggregation.AggregationOperation#getOperator()
*/
@Override
public String getOperator() {
return "$match";
}
}