Hibernate example source code file (JdbcDateTypeDescriptor.java)

This example Hibernate source code file (JdbcDateTypeDescriptor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

calendar, calendar, date, date, date_format, datemutabilityplan, gregoriancalendar, jdbcdatetypedescriptor, jdbcdatetypedescriptor, override, suppresswarnings, text, util, wrapperoptions, x, x

The Hibernate JdbcDateTypeDescriptor.java source code

/*
 * 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.java;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import org.hibernate.HibernateException;
import org.hibernate.type.descriptor.WrapperOptions;

/**
 * TODO : javadoc
 *
 * @author Steve Ebersole
 */
public class JdbcDateTypeDescriptor extends AbstractTypeDescriptor<Date> {
	public static final JdbcDateTypeDescriptor INSTANCE = new JdbcDateTypeDescriptor();
	public static final String DATE_FORMAT = "dd MMMM yyyy";

	public static class DateMutabilityPlan extends MutableMutabilityPlan<Date> {
		public static final DateMutabilityPlan INSTANCE = new DateMutabilityPlan();

		public Date deepCopyNotNull(Date value) {
			return java.sql.Date.class.isInstance( value )
					? new java.sql.Date( value.getTime() )
					: new Date( value.getTime() );
		}
	}

	public JdbcDateTypeDescriptor() {
		super( Date.class, DateMutabilityPlan.INSTANCE );
	}

	public String toString(Date value) {
		return new SimpleDateFormat( DATE_FORMAT ).format( value );
	}

	public Date fromString(String string) {
		try {
			return new Date( new SimpleDateFormat(DATE_FORMAT).parse( string ).getTime() );
		}
		catch ( ParseException pe) {
			throw new HibernateException( "could not parse date string" + string, pe );
		}
	}

	@Override
	public boolean areEqual(Date one, Date another) {
		if ( one == another ) {
			return true;
		}
		if ( one == null || another == null ) {
			return false;
		}

		if ( one.getTime() == another.getTime() ) {
			return true;
		}

		Calendar calendar1 = Calendar.getInstance();
		Calendar calendar2 = Calendar.getInstance();
		calendar1.setTime( one );
		calendar2.setTime( another );

		return calendar1.get( Calendar.MONTH ) == calendar2.get( Calendar.MONTH )
				&& calendar1.get( Calendar.DAY_OF_MONTH ) == calendar2.get( Calendar.DAY_OF_MONTH )
				&& calendar1.get( Calendar.YEAR ) == calendar2.get( Calendar.YEAR );
	}

	@Override
	public int extractHashCode(Date value) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime( value );
		int hashCode = 1;
		hashCode = 31 * hashCode + calendar.get( Calendar.MONTH );
		hashCode = 31 * hashCode + calendar.get( Calendar.DAY_OF_MONTH );
		hashCode = 31 * hashCode + calendar.get( Calendar.YEAR );
		return hashCode;
	}

	@SuppressWarnings({ "unchecked" })
	public <X> X unwrap(Date value, Class type, WrapperOptions options) {
		if ( value == null ) {
			return null;
		}
		if ( java.sql.Date.class.isAssignableFrom( type ) ) {
			final java.sql.Date rtn = java.sql.Date.class.isInstance( value )
					? ( java.sql.Date ) value
					: new java.sql.Date( value.getTime() );
			return (X) rtn;
		}
		if ( java.sql.Time.class.isAssignableFrom( type ) ) {
			final java.sql.Time rtn = java.sql.Time.class.isInstance( value )
					? ( java.sql.Time ) value
					: new java.sql.Time( value.getTime() );
			return (X) rtn;
		}
		if ( java.sql.Timestamp.class.isAssignableFrom( type ) ) {
			final java.sql.Timestamp rtn = java.sql.Timestamp.class.isInstance( value )
					? ( java.sql.Timestamp ) value
					: new java.sql.Timestamp( value.getTime() );
			return (X) rtn;
		}
		if ( Date.class.isAssignableFrom( type ) ) {
			return (X) value;
		}
		if ( Calendar.class.isAssignableFrom( type ) ) {
			final GregorianCalendar cal = new GregorianCalendar();
			cal.setTimeInMillis( value.getTime() );
			return (X) cal;
		}
		if ( Long.class.isAssignableFrom( type ) ) {
			return (X) Long.valueOf( value.getTime() );
		}
		throw unknownUnwrap( type );
	}

	@SuppressWarnings({ "UnnecessaryUnboxing" })
	public <X> Date wrap(X value, WrapperOptions options) {
		if ( value == null ) {
			return null;
		}
		if ( Date.class.isInstance( value ) ) {
			return (Date) value;
		}

		if ( Long.class.isInstance( value ) ) {
			return new java.sql.Date( ( (Long) value ).longValue() );
		}

		if ( Calendar.class.isInstance( value ) ) {
			return new java.sql.Date( ( (Calendar) value ).getTimeInMillis() );
		}

		if ( java.util.Date.class.isInstance( value ) ) {
			return new java.sql.Date( ( (java.util.Date) value ).getTime() );
		}

		throw unknownWrap( value.getClass() );
	}
}