com.senacor.core.manager.BaseManagerImpl.java Source code

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Here is the source code for com.senacor.core.manager.BaseManagerImpl.java

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/**
 * Copyright 2009 Roland Foerther, Carl-Eric-Menzel, Olaf Siefart
 *
 * 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.senacor.core.manager;

import java.beans.PropertyDescriptor;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.LockMode;
import org.hibernate.Session;
import org.hibernate.criterion.CriteriaSpecification;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Restrictions;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

import com.senacor.core.bo.BusinessObject;

public abstract class BaseManagerImpl<T extends BusinessObject> extends ManagerImpl implements BaseManager<T> {
    protected final Class<T> boClass;

    public BaseManagerImpl() {
        Type[] types = findParameterizedSuperclass().getActualTypeArguments();
        boClass = (Class<T>) types[0];
    }

    private ParameterizedType findParameterizedSuperclass() {
        Class c = this.getClass();
        Type t;
        do {
            t = c.getGenericSuperclass();
            c = c.getSuperclass();
        } while ((t == null) || !(t instanceof ParameterizedType));
        return (ParameterizedType) t;
    }

    public T save(final T bo) {
        Session session = getSession();
        session.save(bo);
        return bo;
    }

    protected Session getSession() {
        return sessionFactory.getCurrentSession();
    }

    public T saveOrUpdate(final T bo) {
        Session session = getSession();
        session.saveOrUpdate(bo);
        return bo;
    }

    public T retrieve(final long id) {
        Session session = getSession();
        return (T) session.get(boClass, id);
    }

    public void delete(final T t) {
        Session session = getSession();
        session.delete(t);
    }

    @SuppressWarnings("unchecked")
    public List<T> findAll() {
        Session session = getSession();
        return session.createCriteria(boClass).setResultTransformer(CriteriaSpecification.DISTINCT_ROOT_ENTITY)
                .addOrder(Order.asc("id")).list();
    }

    public List<T> find(final T t) {
        Session session = getSession();
        Criteria criteria = session.createCriteria(boClass);
        criteria.setResultTransformer(CriteriaSpecification.DISTINCT_ROOT_ENTITY);
        PropertyDescriptor[] descriptors = BeanUtils.getPropertyDescriptors(boClass);
        BeanWrapper beanWrapper = new BeanWrapperImpl(t);
        for (PropertyDescriptor descriptor : descriptors) {
            if (!descriptor.getName().equals("class") && !descriptor.getName().equals("id")) {
                Object value = beanWrapper.getPropertyValue(descriptor.getName());
                if (value != null) {
                    criteria.add(Restrictions.eq(descriptor.getName(), value));
                }
            }
        }
        criteria.addOrder(Order.asc("id"));
        return criteria.list();
    }

    protected <A extends BusinessObject> A reattach(final A objectToLock) {
        getSession().lock(objectToLock, LockMode.NONE);
        return objectToLock;
    }
}