com.alilitech.integration.jpa.criteria.specification.CompoundPredicateBuilder Maven / Gradle / Ivy
/**
* Copyright 2017-2020 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 com.alilitech.integration.jpa.criteria.specification;
import com.alilitech.integration.jpa.criteria.Specification;
import com.alilitech.integration.jpa.criteria.expression.CompoundPredicateExpression;
import com.alilitech.integration.jpa.criteria.expression.PredicateExpression;
import org.springframework.util.CollectionUtils;
/**
* @author Zhou Xiaoxiang
* @since 1.1
*/
public class CompoundPredicateBuilder extends PredicateBuilder {
public CompoundPredicateBuilder and() {
this.operator = PredicateExpression.BooleanOperator.AND;
return this;
}
public CompoundPredicateBuilder or() {
this.operator = PredicateExpression.BooleanOperator.OR;
return this;
}
public CompoundPredicateBuilder() {
super(new EmptySpecificationBuilder());
this.operator = PredicateExpression.BooleanOperator.AND;
}
@Override
public Specification build() {
return (cb, query) -> {
for (int i = 0; i < specifications.size(); i++) {
PredicateExpression predicateExpression = specifications.get(i).toPredicate(cb, query);
if(predicateExpression != null) {
this.predicates.add(predicateExpression);
}
}
if (!CollectionUtils.isEmpty(predicates)) {
return new CompoundPredicateExpression(this.operator, predicates);
}
return null;
};
}
}