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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: MessageInterpolator.java 15133 2008-08-20 10:05:57Z hardy.ferentschik $
package org.hibernate.validator;

/**
 * Responsible for validator message interpolation (variable replacement etc)
 * this extension point is useful if the call has some contextual informations to
 * interpolate in validator messages
 *
 * @author Emmanuel Bernard
 */
public interface MessageInterpolator {
	/**
	 * Interpolate a given validator message.
	 * The implementation is free to delegate to the default interpolator or not.
	 */
	String interpolate(String message, Validator validator, MessageInterpolator defaultInterpolator);
}