001/*
002 * Copyright 2002-2015 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.web.bind.support;
018
019import javax.validation.ConstraintValidator;
020import javax.validation.ConstraintValidatorFactory;
021
022import org.springframework.web.context.ContextLoader;
023import org.springframework.web.context.WebApplicationContext;
024
025/**
026 * JSR-303 {@link ConstraintValidatorFactory} implementation that delegates to
027 * the current Spring {@link WebApplicationContext} for creating autowired
028 * {@link ConstraintValidator} instances.
029 *
030 * <p>In contrast to
031 * {@link org.springframework.validation.beanvalidation.SpringConstraintValidatorFactory},
032 * this variant is meant for declarative use in a standard {@code validation.xml} file,
033 * e.g. in combination with JAX-RS or JAX-WS.
034 *
035 * @author Juergen Hoeller
036 * @since 4.2.1
037 * @see ContextLoader#getCurrentWebApplicationContext()
038 * @see org.springframework.validation.beanvalidation.SpringConstraintValidatorFactory
039 */
040public class SpringWebConstraintValidatorFactory implements ConstraintValidatorFactory {
041
042        @Override
043        public <T extends ConstraintValidator<?, ?>> T getInstance(Class<T> key) {
044                return getWebApplicationContext().getAutowireCapableBeanFactory().createBean(key);
045        }
046
047        // Bean Validation 1.1 releaseInstance method
048        public void releaseInstance(ConstraintValidator<?, ?> instance) {
049                getWebApplicationContext().getAutowireCapableBeanFactory().destroyBean(instance);
050        }
051
052
053        /**
054         * Retrieve the Spring {@link WebApplicationContext} to use.
055         * The default implementation returns the current {@link WebApplicationContext}
056         * as registered for the thread context class loader.
057         * @return the current WebApplicationContext (never {@code null})
058         * @see ContextLoader#getCurrentWebApplicationContext()
059         */
060        protected WebApplicationContext getWebApplicationContext() {
061                WebApplicationContext wac = ContextLoader.getCurrentWebApplicationContext();
062                if (wac == null) {
063                        throw new IllegalStateException("No WebApplicationContext registered for current thread - " +
064                                        "consider overriding SpringWebConstraintValidatorFactory.getWebApplicationContext()");
065                }
066                return wac;
067        }
068
069}