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An alternative API for filtering data with Spring MVC and Spring Data JPA. This library provides a custom HandlerMethodArgumentResolver that transforms HTTP parameters into a Specification object ready to use with Spring Data repositories.

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/**
 * Copyright 2014-2022 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
 *
 * 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 net.kaczmarzyk.spring.data.jpa.web;

import net.kaczmarzyk.spring.data.jpa.domain.Disjunction;
import net.kaczmarzyk.spring.data.jpa.web.annotation.Or;
import net.kaczmarzyk.spring.data.jpa.web.annotation.Spec;
import org.springframework.data.jpa.domain.Specification;

import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.List;

/**
 * @author Tomasz Kaczmarzyk
 */
class OrSpecificationResolver implements SpecificationResolver {

    private SimpleSpecificationResolver specResolver;
    
    public OrSpecificationResolver(SimpleSpecificationResolver simpleSpecificationResolver) {
        this.specResolver = simpleSpecificationResolver;
    }
    
    @Override
    public Class getSupportedSpecificationDefinition() {
        return Or.class;
    }

    public Specification buildSpecification(ProcessingContext context, Or def) {
        List> innerSpecs = new ArrayList>();
        for (Spec innerDef : def.value()) {
            Specification innerSpec = specResolver.buildSpecification(context, innerDef);
            if (innerSpec != null) {
                innerSpecs.add(innerSpec);
            }
        }
        
        return innerSpecs.isEmpty() ? null : new Disjunction(innerSpecs);
    }

}