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Modern server-side Java template engine for both web and standalone environments
There is a newer version: 3.1.3.RELEASE
/*
 * =============================================================================
 * 
 *   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.spring5.context.reactive;

import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;

import org.thymeleaf.IEngineConfiguration;
import org.thymeleaf.context.EngineContext;
import org.thymeleaf.context.IContext;
import org.thymeleaf.context.IEngineContext;
import org.thymeleaf.context.IEngineContextFactory;
import org.thymeleaf.engine.TemplateData;
import org.thymeleaf.spring5.SpringWebReactiveTemplateEngine;
import org.thymeleaf.util.Validate;

/**
 * 
 *   Spring Web Reactive-based implementation of the {@link IEngineContextFactory} interface.
 * 
 * 
 *   This factory will examine the context being passed as a parameter and, depending on whether
 *   this context object implements the {@link ISpringWebReactiveContext} interface or not (i.e. whether support
 *   for Spring Web Reactive should be enabled or not), return a {@link SpringWebReactiveEngineContext} or
 *   a simple {@link EngineContext} instance as a result.
 * 
 * 
 *   This is the default factory implementation used by {@link SpringWebReactiveTemplateEngine}.
 * 
 *
 * @author Daniel Fernández
 *
 * @since 3.0.3
 *
 */
public class SpringWebReactiveEngineContextFactory implements IEngineContextFactory {




    public SpringWebReactiveEngineContextFactory() {
        super();
    }




    public IEngineContext createEngineContext(
            final IEngineConfiguration configuration, final TemplateData templateData,
            final Map templateResolutionAttributes, final IContext context) {

        Validate.notNull(context, "Context object cannot be null");

        final Set variableNames = context.getVariableNames();

        if (variableNames == null || variableNames.isEmpty()) {
            if (context instanceof ISpringWebReactiveContext) {
                final ISpringWebReactiveContext srContext = (ISpringWebReactiveContext)context;
                return new SpringWebReactiveEngineContext(
                        configuration, templateData, templateResolutionAttributes,
                        srContext.getExchange(), srContext.getLocale(), Collections.EMPTY_MAP);
            }
            return new EngineContext(
                    configuration, templateData, templateResolutionAttributes,
                    context.getLocale(), Collections.EMPTY_MAP);
        }

        final Map variables = new LinkedHashMap<>(variableNames.size() + 1, 1.0f);
        for (final String variableName : variableNames) {
            variables.put(variableName, context.getVariable(variableName));
        }
        if (context instanceof ISpringWebReactiveContext) {
            final ISpringWebReactiveContext srContext = (ISpringWebReactiveContext)context;
            return new SpringWebReactiveEngineContext(
                    configuration, templateData, templateResolutionAttributes,
                    srContext.getExchange(), srContext.getLocale(), variables);
        }

        return new EngineContext(
                configuration, templateData, templateResolutionAttributes,
                context.getLocale(), variables);

    }


}