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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.dialect;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import org.hibernate.HibernateError;
import org.hibernate.boot.registry.classloading.spi.ClassLoaderService;
import org.hibernate.boot.registry.classloading.spi.ClassLoadingException;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.type.descriptor.jdbc.JdbcType;

/**
 * The following class provides some convenience methods for accessing JdbcType instance,
 * that are loaded into the app class loader, where they have access to the JDBC driver classes.
 *
 * @author Christian Beikov
 */
public class OracleJdbcHelper {

	public static boolean isUsable(ServiceRegistry serviceRegistry) {
		final ClassLoaderService classLoaderService = serviceRegistry.getService( ClassLoaderService.class );
		try {
			classLoaderService.classForName( "oracle.jdbc.OracleConnection" );
			return true;
		}
		catch (ClassLoadingException ex) {
			return false;
		}
	}

	public static JdbcType getArrayJdbcType(ServiceRegistry serviceRegistry) {
		return createJdbcType( serviceRegistry, "org.hibernate.dialect.OracleArrayJdbcType" );
	}

	public static JdbcType getStructJdbcType(ServiceRegistry serviceRegistry) {
		return createJdbcType( serviceRegistry, "org.hibernate.dialect.OracleStructJdbcType" );
	}

	public static JdbcType createJdbcType(ServiceRegistry serviceRegistry, String className) {
		final ClassLoaderService classLoaderService = serviceRegistry.getService( ClassLoaderService.class );
		try {
			final Class clazz = classLoaderService.classForName( className );
			final Constructor constructor = clazz.getConstructor();
			return (JdbcType) constructor.newInstance();
		}
		catch (NoSuchMethodException e) {
			throw new HibernateError( "Class does not have an empty constructor", e );
		}
		catch (InstantiationException | IllegalAccessException | InvocationTargetException e) {
			throw new HibernateError( "Could not construct JdbcType", e );
		}
	}
}