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/*
 * =============================================================================
 * 
 *   Copyright (c) 2011-2016, The THYMELEAF team (http://www.thymeleaf.org)
 * 
 *   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 org.thymeleaf.spring4.expression;

import org.thymeleaf.exceptions.ConfigurationException;
import org.thymeleaf.spring4.util.SpringVersionUtils;
import org.thymeleaf.util.ClassLoaderUtils;

/**
 * 

* Expression object in charge of the creation of URLs using the controller-based mechanism in Spring MVC 4.1. *

*

* This mimics the s:mvcUrl behaviour explained at * http://docs.spring.io/spring/docs/4.1.0.RELEASE/spring-framework-reference/html/mvc.html#mvc-links-to-controllers-from-views * using the same method (function) names in the Spring JSP tag library. *

* * @author Daniel Fernández * * @since 2.1.4 * */ public class Mvc { private static final MvcUriComponentsBuilderDelegate mvcUriComponentsBuilderDelegate; private static final String SPRING41_MVC_URI_COMPONENTS_BUILDER_DELEGATE_CLASS_NAME = Mvc.class.getName() + "$Spring41MvcUriComponentsBuilderDelegate"; private static final String NON_SPRING41_MVC_URI_COMPONENTS_BUILDER_DELEGATE_CLASS_NAME = Mvc.class.getName() + "$NonSpring41MvcUriComponentsBuilderDelegate"; static { final ClassLoader classLoader = ClassLoaderUtils.getClassLoader(Mvc.class); final String delegateClassName = (SpringVersionUtils.isSpring41AtLeast()? SPRING41_MVC_URI_COMPONENTS_BUILDER_DELEGATE_CLASS_NAME : NON_SPRING41_MVC_URI_COMPONENTS_BUILDER_DELEGATE_CLASS_NAME); try { final Class implClass = Class.forName(delegateClassName, true, classLoader); mvcUriComponentsBuilderDelegate = (MvcUriComponentsBuilderDelegate) implClass.newInstance(); } catch (final Exception e) { throw new ExceptionInInitializerError( new ConfigurationException( "Thymeleaf could not initialize a delegate of class \"" + delegateClassName + "\" for taking " + "care of the " + SpringStandardExpressionObjectFactory.MVC_EXPRESSION_OBJECT_NAME + " expression utility object", e)); } } public MethodArgumentBuilderWrapper url(final String mappingName) { return mvcUriComponentsBuilderDelegate.fromMappingName(mappingName); } static interface MvcUriComponentsBuilderDelegate { public MethodArgumentBuilderWrapper fromMappingName(String mappingName); } static class Spring41MvcUriComponentsBuilderDelegate implements MvcUriComponentsBuilderDelegate { Spring41MvcUriComponentsBuilderDelegate() { super(); } public MethodArgumentBuilderWrapper fromMappingName(final String mappingName) { return new Spring41MethodArgumentBuilderWrapper(org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder.fromMappingName(mappingName)); } } static class NonSpring41MvcUriComponentsBuilderDelegate implements MvcUriComponentsBuilderDelegate { NonSpring41MvcUriComponentsBuilderDelegate() { super(); } public MethodArgumentBuilderWrapper fromMappingName(final String mappingName) { throw new UnsupportedOperationException( "MVC URI component building is only supported in Spring versions 4.1 or newer"); } } public static interface MethodArgumentBuilderWrapper { public MethodArgumentBuilderWrapper arg(int index, Object value); public String build(); public String buildAndExpand(Object... uriVariables); } static class Spring41MethodArgumentBuilderWrapper implements MethodArgumentBuilderWrapper { private final org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder.MethodArgumentBuilder builder; private Spring41MethodArgumentBuilderWrapper( final org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder.MethodArgumentBuilder builder) { super(); this.builder = builder; } public MethodArgumentBuilderWrapper arg(final int index, final Object value) { return new Spring41MethodArgumentBuilderWrapper(this.builder.arg(index, value)); } public String build() { return this.builder.build(); } public String buildAndExpand(final Object... uriVariables) { return this.builder.buildAndExpand(uriVariables); } } }




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