org.jdbcluster.template.hibernate.HibernateConfiguration.java Source code

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Here is the source code for org.jdbcluster.template.hibernate.HibernateConfiguration.java

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/*
 * Copyright 2002-2005 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 org.jdbcluster.template.hibernate;

import java.util.Iterator;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.mapping.Column;
import org.hibernate.mapping.PersistentClass;
import org.hibernate.mapping.Property;
import org.jdbcluster.exception.ConfigurationException;
import org.jdbcluster.metapersistence.cluster.ICluster;
import org.jdbcluster.template.ConfigurationTemplate;
import org.jdbcluster.template.SessionFactoryTemplate;
import org.springframework.util.Assert;

/**
 * HBMConfiguration is an implementation of ConfigurationTemplate
 * and provides Hibernate specific information about sessions, sessionfactory
 * and Hibernate configuration (e.g. config file)
 * 
 * @author Philipp Noggler
 *
 */
public class HibernateConfiguration implements ConfigurationTemplate {

    /*
     * Hibernate configuration
     */
    protected Configuration cfg = null;

    /*
     * Session Factory
     */
    protected SessionFactory hibernateFactory;

    /**
     * getter of configuration
     * @return
     */
    public Configuration getConfiguration() {
        return cfg;
    }

    /**
     * setter of configuration
     * @param config
     */
    public void setConfiguration(Object config) {
        cfg = new Configuration().configure((String) config);
    }

    /**
     * @return SessionFactoryTemplate
     */
    public SessionFactoryTemplate buildSessionFactory() {
        hibernateFactory = cfg.buildSessionFactory();
        return new HibernateSessionFactory(hibernateFactory);
    }

    /**
     * returns the native configuration object
     * @return T
     */
    @SuppressWarnings("unchecked")
    public <T> T getNativeConfiguration() {
        return (T) cfg;
    }

    /**
     * calculated the max length of an attribute of type String
     * @param c Cluster that holds the attribute
     * @param attributeName name of the attribute
     * @return max allowed length of the attribute
     */
    public int getLenthOfStringAttribute(ICluster c, String attributeName) {

        Assert.notNull(c, "c may not be null");
        Assert.notNull(attributeName, "attributeName may not be null");

        PersistentClass pc = cfg.getClassMapping(c.getDaoClass().getName());

        if (pc == null)
            throw new ConfigurationException(
                    "Persistent Dao Class from Cluster " + c.getClass().getName() + " is not Hibernate configured");

        Property p = pc.getProperty(attributeName);

        if (p == null)
            throw new ConfigurationException(
                    "Property " + attributeName + " in cluster " + c.getClass().getName() + " not found");

        Iterator<Column> i = (Iterator<Column>) p.getValue().getColumnIterator();
        Column column = i.next();
        return column.getLength();
    }

}