/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.type.descriptor.sql;

import java.sql.PreparedStatement;
import java.sql.SQLException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.hibernate.type.descriptor.JdbcTypeNameMapper;
import org.hibernate.type.descriptor.ValueBinder;
import org.hibernate.type.descriptor.WrapperOptions;
import org.hibernate.type.descriptor.java.JavaTypeDescriptor;

/**
 * Convenience base implementation of {@link ValueBinder}
 *
 * @author Steve Ebersole
 */
public abstract class BasicBinder<J> implements ValueBinder<J> {
	private static final Logger log = LoggerFactory.getLogger( BasicBinder.class );

	private static final String BIND_MSG_TEMPLATE = "binding parameter [%d] as [%s] - %s";
	private static final String NULL_BIND_MSG_TEMPLATE = "binding parameter [%d] as [%s] - <null>";

	private final JavaTypeDescriptor<J> javaDescriptor;
	private final SqlTypeDescriptor sqlDescriptor;

	public JavaTypeDescriptor<J> getJavaDescriptor() {
		return javaDescriptor;
	}

	public SqlTypeDescriptor getSqlDescriptor() {
		return sqlDescriptor;
	}

	public BasicBinder(JavaTypeDescriptor<J> javaDescriptor, SqlTypeDescriptor sqlDescriptor) {
		this.javaDescriptor = javaDescriptor;
		this.sqlDescriptor = sqlDescriptor;
	}

	/**
	 * {@inheritDoc}
	 */
	public final void bind(PreparedStatement st, J value, int index, WrapperOptions options) throws SQLException {
		if ( value == null ) {
			if ( log.isTraceEnabled() ) {
				log.trace(
						String.format(
								NULL_BIND_MSG_TEMPLATE,
								index,
								JdbcTypeNameMapper.getTypeName( sqlDescriptor.getSqlType() )
						)
				);
			}
			st.setNull( index, sqlDescriptor.getSqlType() );
		}
		else {
			if ( log.isTraceEnabled() ) {
				log.trace(
						String.format(
								BIND_MSG_TEMPLATE,
								index,
								JdbcTypeNameMapper.getTypeName( sqlDescriptor.getSqlType() ),
								getJavaDescriptor().extractLoggableRepresentation( value )
						)
				);
			}
			doBind( st, value, index, options );
		}
	}

	/**
	 * Perform the binding.  Safe to assume that value is not null.
	 *
	 * @param st The prepared statement
	 * @param value The value to bind (not null).
	 * @param index The index at which to bind
	 * @param options The binding options
	 *
	 * @throws SQLException Indicates a problem binding to the prepared statement.
	 */
	protected abstract void doBind(PreparedStatement st, J value, int index, WrapperOptions options) throws SQLException;
}
