/*
* =============================================================================
*
* 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 java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.thymeleaf.Arguments;
import org.thymeleaf.Configuration;
import org.thymeleaf.Standards;
import org.thymeleaf.dom.Element;
import org.thymeleaf.exceptions.TemplateProcessingException;
import org.thymeleaf.processor.IAttributeNameProcessorMatcher;
import org.thymeleaf.processor.attr.AbstractAttributeModifierAttrProcessor;
import org.thymeleaf.standard.expression.Assignation;
import org.thymeleaf.standard.expression.AssignationSequence;
import org.thymeleaf.standard.expression.AssignationUtils;
import org.thymeleaf.standard.expression.IStandardExpression;
import org.thymeleaf.util.ArrayUtils;
import org.thymeleaf.util.EvaluationUtil;
import org.thymeleaf.util.StringUtils;
import org.thymeleaf.util.TemplateModeUtils;
/**
*
* @author Daniel Fernández
*
* @since 1.0
*
*/
public abstract class AbstractStandardAttributeModifierAttrProcessor
extends AbstractAttributeModifierAttrProcessor {
protected AbstractStandardAttributeModifierAttrProcessor(final IAttributeNameProcessorMatcher matcher) {
super(matcher);
}
protected AbstractStandardAttributeModifierAttrProcessor(final String attributeName) {
super(attributeName);
}
@Override
protected final Map<String,String> getModifiedAttributeValues(
final Arguments arguments, final Element element, final String attributeName) {
final String attributeValue = element.getAttributeValue(attributeName);
final Configuration configuration = arguments.getConfiguration();
final AssignationSequence assignations =
AssignationUtils.parseAssignationSequence(
configuration, arguments, attributeValue, false /* no parameters without value */);
if (assignations == null) {
throw new TemplateProcessingException(
"Could not parse value as attribute assignations: \"" + attributeValue + "\"");
}
final Map<String,String> newAttributeValues = new HashMap<String,String>(assignations.size() + 1, 1.0f);
for (final Assignation assignation : assignations) {
final IStandardExpression leftExpr = assignation.getLeft();
final Object leftValue = leftExpr.execute(configuration, arguments);
final IStandardExpression rightExpr = assignation.getRight();
final Object rightValue = rightExpr.execute(configuration, arguments);
final String newAttributeName = (leftValue == null? null : leftValue.toString());
if (StringUtils.isEmptyOrWhitespace(newAttributeName)) {
throw new TemplateProcessingException(
"Attribute name expression evaluated as null or empty: \"" + leftExpr + "\"");
}
if (TemplateModeUtils.isHtml(arguments.getTemplateResolution().getTemplateMode()) &&
ArrayUtils.contains(Standards.HTML_CONDITIONAL_FIXED_VALUE_ATTR_NAMES, newAttributeName)) {
// Attribute is a fixed-value conditional one, like "selected", which can only
// appear as selected="selected" or not appear at all.
if (EvaluationUtil.evaluateAsBoolean(rightValue)) {
newAttributeValues.put(newAttributeName, newAttributeName);
} else {
newAttributeValues.put(newAttributeName, null);
}
} else {
// Attribute is a "normal" attribute, not a fixed-value conditional one
newAttributeValues.put(newAttributeName, (rightValue == null ? "" : rightValue.toString()));
}
}
return Collections.unmodifiableMap(newAttributeValues);
}
@Override
protected boolean recomputeProcessorsAfterExecution(final Arguments arguments,
final Element element, final String attributeName) {
return false;
}
}