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Bean Validation API
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// $Id: ValidatorFactory.java 17620 2009-10-04 19:19:28Z hardy.ferentschik $
/*
* JBoss, Home of Professional Open Source
* Copyright 2009, Red Hat, Inc. and/or its affiliates, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.validation;

/**
 * Factory returning initialized Validator instances.
 * Implementations are thread-safe
 * This object is typically cached and reused.
 *
 * @author Emmanuel Bernard
 */
public interface ValidatorFactory {
	/**
	 * Returns an initialized Validator instance using the
	 * factory defaults for message interpolator, traversable resolver
	 * and constraint validator factory.
	 * 
	 * Validator instances can be pooled and shared by the implementation.
	 * 
	 * @return an initialized Validator instance
	 */
	Validator getValidator();

	/**
	 * Defines a new validator context and return a Validator
	 * compliant this new context.
	 *
	 * @return a ValidatorContext.
	 */
	ValidatorContext usingContext();

	/**
	 * Returns the MessageInterpolator instance configured at
	 * initialization time for the ValidatorFactory.
	 * This is the instance used by #getValidator().
	 *
	 * @return MessageInterpolator instance.
	 */
	MessageInterpolator getMessageInterpolator();

	/**
	 * Returns the TraversableResolver instance configured
	 * at initialization time for the ValidatorFactory.
	 * This is the instance used by #getValidator().
	 *
	 * @return TraversableResolver instance.
	 */
	TraversableResolver getTraversableResolver();

	/**
	 * Returns the ConstraintValidatorFactory instance
	 * configured at initialization time for the
	 * ValidatorFactory.
	 * This is the instance used by #getValidator().
	 *
	 * @return ConstraintValidatorFactory instance.
	 */
	ConstraintValidatorFactory getConstraintValidatorFactory();

	/**
	 * Return an instance of the specified type allowing access to
	 * provider-specific APIs. If the Bean Validation provider
	 * implementation does not support the specified class,
	 * ValidationException, is thrown.
	 *
	 * @param type  the class of the object to be returned.
	 *
	 * @return an instance of the specified class.
	 *
	 * @throws ValidationException if the provider does not
	 *         support the call.
	 */
	public  T unwrap(Class type);
}