/* * 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 <http://www.gnu.org/licenses/lgpl-2.1.html>. */ package org.hibernate.userguide.collections.type; import java.sql.Timestamp; import java.util.Comparator; import java.util.Date; import org.hibernate.HibernateException; import org.hibernate.dialect.Dialect; import org.hibernate.engine.spi.SharedSessionContractImplementor; import org.hibernate.type.AbstractSingleColumnStandardBasicType; import org.hibernate.type.LiteralType; import org.hibernate.type.StringType; import org.hibernate.type.VersionType; import org.hibernate.type.descriptor.java.JdbcTimestampTypeDescriptor; import org.hibernate.type.descriptor.sql.BigIntTypeDescriptor; /** * @author Vlad Mihalcea */ //tag::collections-map-custom-key-type-mapping-example[] public class TimestampEpochType extends AbstractSingleColumnStandardBasicType<Date> implements VersionType<Date>, LiteralType<Date> { public static final TimestampEpochType INSTANCE = new TimestampEpochType(); public TimestampEpochType() { super( BigIntTypeDescriptor.INSTANCE, JdbcTimestampTypeDescriptor.INSTANCE ); } @Override public String getName() { return "epoch"; } @Override public Date next( Date current, SharedSessionContractImplementor session) { return seed( session ); } @Override public Date seed( SharedSessionContractImplementor session) { return new Timestamp( System.currentTimeMillis() ); } @Override public Comparator<Date> getComparator() { return getJavaTypeDescriptor().getComparator(); } @Override public String objectToSQLString( Date value, Dialect dialect) throws Exception { final Timestamp ts = Timestamp.class.isInstance( value ) ? ( Timestamp ) value : new Timestamp( value.getTime() ); return StringType.INSTANCE.objectToSQLString( ts.toString(), dialect ); } @Override public Date fromStringValue( String xml) throws HibernateException { return fromString( xml ); } } //end::collections-map-custom-key-type-mapping-example[]