/*
* =============================================================================
*
* 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.standard.processor.attr;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.thymeleaf.Arguments;
import org.thymeleaf.Configuration;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.dom.Element;
import org.thymeleaf.exceptions.TemplateProcessingException;
import org.thymeleaf.processor.IAttributeNameProcessorMatcher;
import org.thymeleaf.processor.attr.AbstractConditionalVisibilityAttrProcessor;
import org.thymeleaf.standard.expression.EqualsExpression;
import org.thymeleaf.standard.expression.IStandardExpression;
import org.thymeleaf.standard.expression.IStandardExpressionParser;
import org.thymeleaf.standard.expression.StandardExpressions;
import org.thymeleaf.standard.processor.attr.AbstractStandardSwitchStructureAttrProcessor.SwitchStructure;
import org.thymeleaf.util.EvaluationUtil;
/**
*
* @author Daniel Fernández
*
* @since 2.0.0
*
*/
public abstract class AbstractStandardCaseAttrProcessor
extends AbstractConditionalVisibilityAttrProcessor {
public static final String CASE_DEFAULT_ATTRIBUTE_VALUE = "*";
private final Logger logger = LoggerFactory.getLogger(this.getClass());
protected AbstractStandardCaseAttrProcessor(final IAttributeNameProcessorMatcher matcher) {
super(matcher);
}
protected AbstractStandardCaseAttrProcessor(final String attributeName) {
super(attributeName);
}
@Override
protected boolean isVisible(final Arguments arguments, final Element element, final String attributeName) {
if (!arguments.hasLocalVariable(AbstractStandardSwitchStructureAttrProcessor.SWITCH_VARIABLE_NAME)) {
throw new TemplateProcessingException(
"Cannot specify a \"" + attributeName + "\" attribute in an environment where no " +
"switch operator has been defined before.");
}
final SwitchStructure switchStructure =
(SwitchStructure) arguments.getLocalVariable(AbstractStandardSwitchStructureAttrProcessor.SWITCH_VARIABLE_NAME);
if (switchStructure.isExecuted()) {
return false;
}
final String attributeValue = element.getAttributeValue(attributeName);
if (attributeValue != null && attributeValue.trim().equals(CASE_DEFAULT_ATTRIBUTE_VALUE)) {
if (this.logger.isTraceEnabled()) {
this.logger.trace("[THYMELEAF][{}][{}] Case expression \"{}\" in attribute \"{}\" has been evaluated as: \"{}\"",
new Object[] {TemplateEngine.threadIndex(), arguments.getTemplateName(), attributeValue, attributeName, attributeValue, Boolean.TRUE});
}
switchStructure.setExecuted(true);
return true;
}
final Configuration configuration = arguments.getConfiguration();
final IStandardExpressionParser expressionParser = StandardExpressions.getExpressionParser(configuration);
final IStandardExpression caseExpression = expressionParser.parseExpression(configuration, arguments, attributeValue);
final EqualsExpression equalsExpression = new EqualsExpression(switchStructure.getExpression(), caseExpression);
final Object value = equalsExpression.execute(configuration, arguments);
final boolean visible = EvaluationUtil.evaluateAsBoolean(value);
if (this.logger.isTraceEnabled()) {
this.logger.trace("[THYMELEAF][{}][{}] Case expression \"{}\" in attribute \"{}\" has been evaluated as: \"{}\"",
new Object[] {TemplateEngine.threadIndex(), arguments.getTemplateName(), attributeValue, attributeName, attributeValue, Boolean.valueOf(visible)});
}
if (visible) {
switchStructure.setExecuted(true);
}
return visible;
}
}