Hibernate example source code file (ColumnTransformer.java)

This example Hibernate source code file (ColumnTransformer.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

annotation, columntransformer, columntransformer, field,method, field,method, retention, retention, string, string

The Hibernate ColumnTransformer.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat, Inc. and/or its affiliates 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.annotations;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Retention;

/**
 * Custom SQL expression used to read the value from and write a value to a column.
 * Use for direct object loading/saving as well as queries.
 * The write expression must contain exactly one '?' placeholder for the value. 
 *
 * For example: <code>read="decrypt(credit_card_num)" write="encrypt(?)"
 *  
 * @author Emmanuel Bernard
 */
@java.lang.annotation.Target({FIELD,METHOD})
@Retention(RUNTIME)
public @interface ColumnTransformer {
	/**
	 * (Logical) column name for which the expression is used
	 *
	 * This can be left out if the property is bound to a single column
	 */
	String forColumn() default "";

	/**
	 * Custom SQL expression used to read from the column
	 */
	String read() default "";

	/**
	 * Custom SQL expression used to write to the column.
	 * The write expression must contain exactly one '?' placeholder for the value.
	 */
	String write() default "";
}