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Following the DRY (Don't Repeat Yourself) principle, Hibernate Validator let's you express your domain constraints once (and only once) and ensure their compliance at various level of your system automatically.

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//$Id: MinValidator.java 15765 2009-01-09 14:56:30Z hardy.ferentschik $
package org.hibernate.validator;

import java.io.Serializable;
import java.math.BigDecimal;
import java.math.BigInteger;

import org.hibernate.mapping.Column;
import org.hibernate.mapping.Property;

/**
 * Do check a min restriction on a numeric (whether and actual number or its string representation,
 * and apply expected contraints on hibernate metadata.
 *
 * @author Gavin King
 */
public class MinValidator implements Validator, PropertyConstraint, Serializable {

	private long min;

	public void initialize(Min parameters) {
		min = parameters.value();
	}

	public boolean isValid(Object value) {
		if ( value == null ) return true;
		if ( value instanceof String ) {
			try {
				return new BigDecimal( (String) value ).compareTo( BigDecimal.valueOf(min) ) >= 0;
			}
			catch (NumberFormatException nfe) {
				return false;
			}
		}
		else if ( ( value instanceof Double ) || ( value instanceof Float ) ) {
			double dv = ( (Number) value ).doubleValue();
			return dv >= min;
		}
		else if ( value instanceof BigInteger ) {
			return ( (BigInteger) value ).compareTo( BigInteger.valueOf( min ) ) >= 0;
		}
		else if ( value instanceof BigDecimal ) {
			return ( (BigDecimal) value ).compareTo( BigDecimal.valueOf( min ) ) >= 0;
		}
		else if ( value instanceof Number ) {
			long lv = ( (Number) value ).longValue();
			return lv >= min;
		}
		else {
			return false;
		}
	}

	public void apply(Property property) {
		Column col = (Column) property.getColumnIterator().next();
		col.setCheckConstraint( col.getName() + ">=" + min );
	}
}