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Modern server-side Java template engine for both web and standalone environments

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/*
 * =============================================================================
 *
 *   Copyright (c) 2011-2018, 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.spring5.webflow.view;

import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.js.ajax.AjaxHandler;
import org.springframework.util.StringUtils;
import org.thymeleaf.exceptions.ConfigurationException;
import org.thymeleaf.spring5.view.ThymeleafView;


/**
 * 

* Subclass of {@link ThymeleafView} adding compatibility with AJAX events in * Spring JavaScript (part of Spring WebFlow). This allows this View implementation * to be able to return only fragments of the page. *

*

* These rendering of fragments is used, for example, in Spring WebFlow's <render> * instructions (though not only). *

*

* This view searches for a comma-separated list of markup selectors in a request * parameter called {@code fragments}. *

* * @author Daniel Fernández * * @since 3.0.3 * */ public class AjaxThymeleafView extends ThymeleafView implements AjaxEnabledView { private static final Logger vlogger = LoggerFactory.getLogger(AjaxThymeleafView.class); private static final String FRAGMENTS_PARAM = "fragments"; private AjaxHandler ajaxHandler = null; public AjaxThymeleafView() { super(); } public AjaxHandler getAjaxHandler() { return this.ajaxHandler; } public void setAjaxHandler(final AjaxHandler ajaxHandler) { this.ajaxHandler = ajaxHandler; } @Override public void render(final Map model, final HttpServletRequest request, final HttpServletResponse response) throws Exception { final AjaxHandler templateAjaxHandler = getAjaxHandler(); if (templateAjaxHandler == null) { throw new ConfigurationException("[THYMELEAF] AJAX Handler set into " + AjaxThymeleafView.class.getSimpleName() + " instance for template " + getTemplateName() + " is null."); } if (templateAjaxHandler.isAjaxRequest(request, response)) { final Set fragmentsToRender = getRenderFragments(model, request, response); if (fragmentsToRender == null || fragmentsToRender.size() == 0) { vlogger.warn("[THYMELEAF] An Ajax request was detected, but no fragments were specified to be re-rendered. " + "Falling back to full page render. This can cause unpredictable results when processing " + "the ajax response on the client."); super.render(model, request, response); return; } super.renderFragment(fragmentsToRender, model, request, response); } else { super.render(model, request, response); } } @SuppressWarnings({ "rawtypes", "unused" }) protected Set getRenderFragments( final Map model, final HttpServletRequest request, final HttpServletResponse response) { final String fragmentsParam = request.getParameter(FRAGMENTS_PARAM); final String[] renderFragments = StringUtils.commaDelimitedListToStringArray(fragmentsParam); if (renderFragments.length == 0) { return null; } if (renderFragments.length == 1) { return Collections.singleton(renderFragments[0]); } return new HashSet(Arrays.asList(renderFragments)); } }




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