com.wiiyaya.framework.provider.repository.BaseDaoImpl.java Source code

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Here is the source code for com.wiiyaya.framework.provider.repository.BaseDaoImpl.java

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/*
 * Copyright 2016-2017 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 com.wiiyaya.framework.provider.repository;

import com.mysema.query.Tuple;
import com.mysema.query.jpa.JPQLQuery;
import com.mysema.query.types.EntityPath;
import com.mysema.query.types.Predicate;
import com.mysema.query.types.path.PathBuilder;
import com.wiiyaya.framework.provider.tools.BaseDao;
import com.wiiyaya.framework.provider.tools.JF;
import com.wiiyaya.framework.provider.tools.JFTuple;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.support.JpaEntityInformation;
import org.springframework.data.jpa.repository.support.Querydsl;
import org.springframework.data.jpa.repository.support.SimpleJpaRepository;
import org.springframework.data.querydsl.SimpleEntityPathResolver;

import javax.persistence.EntityManager;
import java.io.Serializable;
import java.util.Collections;
import java.util.List;

public class BaseDaoImpl<T, ID extends Serializable> extends SimpleJpaRepository<T, ID> implements BaseDao<T, ID> {

    private final EntityPath<T> path;
    private final PathBuilder<T> builder;
    private final Querydsl querydsl;

    public BaseDaoImpl(JpaEntityInformation<T, ID> entityInformation, EntityManager entityManager) {
        super(entityInformation, entityManager);
        this.path = SimpleEntityPathResolver.INSTANCE.createPath(entityInformation.getJavaType());
        this.builder = new PathBuilder<T>(path.getType(), path.getMetadata());
        this.querydsl = new Querydsl(entityManager, builder);
    }

    @Override
    public Page<T> findAll(Predicate predicate, Pageable pageable) {
        JPQLQuery countQuery = createWhereQuery(predicate);
        JPQLQuery query = querydsl.applyPagination(pageable, createWhereQuery(predicate));

        Long total = countQuery.count();
        List<T> content = total > pageable.getOffset() ? query.list(path) : Collections.<T>emptyList();

        return new PageImpl<T>(content, pageable, total);
    }

    @Override
    public List<T> findAll(Predicate predicate) {
        return createWhereQuery(predicate).list(path);
    }

    @Override
    public Page<T> findAllJF(JF joinFetch, Pageable pageable) {
        JPQLQuery countQuery = createQuery();
        joinFetch.prepareQry(countQuery, false);
        Long total = countQuery.count();

        List<T> content = null;
        if (total > pageable.getOffset()) {
            JPQLQuery query = querydsl.applyPagination(pageable, createQuery());
            joinFetch.prepareQry(query, true);
            content = query.list(path);
        } else {
            content = Collections.<T>emptyList();
        }
        return new PageImpl<T>(content, pageable, total);
    }

    @Override
    public List<T> findAllJF(JF joinFetch) {
        JPQLQuery query = createQuery();
        joinFetch.prepareQry(query, true);
        return query.list(path);
    }

    @Override
    public Page<Tuple> findAllJFTuple(JFTuple joinFetch, Pageable pageable) {
        JPQLQuery countQuery = createQuery();
        joinFetch.prepareQry(countQuery, false);
        Long total = countQuery.count();

        List<Tuple> content = null;
        if (total > pageable.getOffset()) {
            JPQLQuery query = querydsl.applyPagination(pageable, createQuery());
            content = joinFetch.prepareQry(query, true);
        } else {
            content = Collections.<Tuple>emptyList();
        }
        return new PageImpl<Tuple>(content, pageable, total);
    }

    @Override
    public List<Tuple> findAllJFTuple(JFTuple joinFetch) {
        return joinFetch.prepareQry(createQuery(), true);
    }

    private JPQLQuery createWhereQuery(Predicate... predicate) {
        return createQuery().where(predicate);
    }

    private JPQLQuery createQuery() {
        return querydsl.createQuery(path);
    }
}