cz.muni.pa165.carparkapp.DAOImpl.BranchDAOImpl.java Source code

Introduction

Here is the source code for cz.muni.pa165.carparkapp.DAOImpl.BranchDAOImpl.java

Source

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package cz.muni.pa165.carparkapp.DAOImpl;

import cz.muni.pa165.carparkapp.DAO.BranchDAO;
import cz.muni.pa165.carparkapp.Entities.Branch;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.transaction.Transactional;
import org.springframework.stereotype.Repository;

/**
 *
 * @author coldfront
 */
@Repository("branchDAO")
@Transactional
public class BranchDAOImpl implements BranchDAO {
    @PersistenceContext
    private EntityManager em;

    public BranchDAOImpl() {
    }

    public EntityManager getEm() {
        return em;
    }

    public void setEm(EntityManager em) {
        this.em = em;
    }

    @Override
    public Branch createBranch(Branch branch) {
        if (branch == null)
            throw new NullPointerException("Argument cannot be null");

        em.persist(branch);
        return branch;
    }

    @Override
    public boolean updateBranch(Branch branch) {
        if (branch == null)
            throw new NullPointerException("Argument cannot be null");

        if (findBranch(branch.getId()) == null)
            return false;

        em.merge(branch);
        return true;
    }

    @Override
    public Branch findBranch(int id) {
        if (id < 1)
            throw new IllegalArgumentException("id must be positive number");

        Branch branch = em.find(Branch.class, id);
        return branch;
    }

    @Override
    public boolean deleteBranch(Branch branch) {
        if (branch == null)
            throw new NullPointerException("Argument cannot be null");

        Branch attached = em.find(Branch.class, branch.getId());

        if (attached == null) {
            return false;
        }

        em.remove(attached);
        return true;
    }

    @Override
    public List<Branch> getAllBranches() {
        List<Branch> allBranches = em.createQuery("SELECT b FROM Branch b", Branch.class).getResultList();
        return allBranches;
    }

}