[JavaForFun] /

package de.spring.example.services.impl;

import javax.inject.Inject;
import javax.inject.Named;

import org.resthub.common.service.CrudServiceImpl;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;

import com.querydsl.core.types.dsl.BooleanExpression;

import de.spring.example.persistence.domain.AdDescription;
import de.spring.example.persistence.domain.QAdDescription;
import de.spring.example.persistence.repository.AdDescriptionRepository;
import de.spring.example.services.AdDescriptionService;

@Named("adDescriptionService")
public class AdDescriptionServiceImpl
        extends CrudServiceImpl<AdDescription, Long, AdDescriptionRepository>
        implements AdDescriptionService {

        @Override
        @Inject
    public void setRepository(AdDescriptionRepository repository) {
        this.repository = repository;
    }

        // Extending CrudServiceImpl when we need some business logic. Otherwise we would be using
        // the JPA repositories and nothing else :)
        
        // In this case there is any business logic, but this is just an example.
        
        
        /**
         * Using Querydsl. Giving some business logic to this service :)
         * 
         * Querydsl: fluent interface done easy. There is no effort because it is already implemented.
         * 
         * Criteria using Specifications requires some effort.
         * 
         * See: de.spring.example.services.impl.AdServiceImpl
         */
        @Override
        public Page<AdDescription> queryDslExample(Pageable pageRequest) {
                final QAdDescription adDescription = QAdDescription.adDescription1;
                final BooleanExpression adDescriptionHasAdLink = adDescription.adLink.contains("gumartinm");
                final BooleanExpression adDescriptionHasDescription = adDescription.adDescription.contains("babucha");
                
                return repository.findAll(adDescriptionHasAdLink.and(adDescriptionHasDescription), pageRequest);
        }
}