/***
 * Copyright (c) 2009 Caelum - www.caelum.com.br/opensource All rights reserved.
 *
 * 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 br.com.caelum.vraptor.validator;

import static java.util.Arrays.asList;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.validation.Validation;
import javax.validation.ValidatorFactory;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import br.com.caelum.vraptor.http.ParameterNameProvider;
import br.com.caelum.vraptor.ioc.ApplicationScoped;
import br.com.caelum.vraptor.ioc.ComponentFactory;

/**
 * Bring up Method Validation factory. This class builds the {@link ValidatorFactory} factory once when
 * application starts. This class only works with Bean Validation 1.1 (for 1.0 use
 * {@link ValidatorFactoryCreator} instead. WARN: Method validation is beta, and is subject to change.
 *
 * @author Otávio Scherer Garcia
 * @since 3.5.2
 */
@ApplicationScoped
public class MethodValidatorFactoryCreator
	implements ComponentFactory<ValidatorFactory> {

	private static final Logger logger = LoggerFactory.getLogger(MethodValidatorFactoryCreator.class);
	private static final List<Method> OBJECT_METHODS = asList(Object.class.getDeclaredMethods());

	private ValidatorFactory instance;
	private final ParameterNameProvider nameProvider;
	private final DIConstraintValidatorFactory constraintValidatorFactory;

	public MethodValidatorFactoryCreator(ParameterNameProvider nameProvider,
		DIConstraintValidatorFactory constraintValidatorFactory) {
	this.nameProvider = nameProvider;
	this.constraintValidatorFactory = constraintValidatorFactory;
	}

	@PostConstruct
	public void buildFactory() {
	instance = Validation.byDefaultProvider().configure()
		.constraintValidatorFactory(constraintValidatorFactory).buildValidatorFactory();

	logger.debug("Initializing Bean Validation (1.1 supported)");
	}

	@PreDestroy
	public void close() {
	instance.close();
	}

	public ValidatorFactory getInstance() {
	if (instance == null) { // pico don't call PostConstruct
		buildFactory();
	}
	return instance;
	}
}