/*
* =============================================================================
*
* Copyright (c) 2011-2014, 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.spring3.expression;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.expression.BeanFactoryResolver;
import org.springframework.context.expression.MapAccessor;
import org.springframework.core.convert.ConversionService;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.expression.spel.support.StandardTypeConverter;
import org.thymeleaf.util.Validate;
/**
* <p>
* Thymeleaf's basic implementation of Spring's {@link org.springframework.expression.EvaluationContext}
* interface.
* </p>
* <p>
* This implementation adds Thymeleaf's own property accessors
* (see {@link org.springframework.expression.PropertyAccessor}) for accessing
* the {@link org.thymeleaf.context.VariablesMap} object in which variables are stored at the
* context.
* </p>
* <p>
* Also, this evaluation context (which is usually instanced at the
* {@link org.thymeleaf.spring3.view.ThymeleafView} initialization) links the execution of expressions
* with the available {@link BeanFactory} and {@link ConversionService} instances, used during evaluation.
* </p>
* <p>
* Before executing a Spring EL expression using this evaluation context, it should be enriched with the
* variables to be made accessible (like <tt>#variableName</tt>), using a
* {@link ThymeleafEvaluationContextWrapper} object.
* </p>
*
* @author Daniel Fernández
*
* @since 2.1.0
*
*/
public final class ThymeleafEvaluationContext extends StandardEvaluationContext {
public static final String THYMELEAF_EVALUATION_CONTEXT_CONTEXT_VARIABLE_NAME = "thymeleafEvaluationContext";
public static final MapAccessor MAP_ACCESSOR_INSTANCE = new MapAccessor();
public ThymeleafEvaluationContext(final BeanFactory beanFactory, final ConversionService conversionService) {
super();
Validate.notNull(beanFactory, "Bean factory cannot be null");
// ConversionService CAN be null
this.setBeanResolver(new BeanFactoryResolver(beanFactory));
if (conversionService != null) {
this.setTypeConverter(new StandardTypeConverter(conversionService));
}
this.addPropertyAccessor(VariablesMapPropertyAccessor.INSTANCE);
this.addPropertyAccessor(BeansPropertyAccessor.INSTANCE);
this.addPropertyAccessor(MAP_ACCESSOR_INSTANCE);
}
}