/*
* =============================================================================
*
* 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.dom.Element;
import org.thymeleaf.exceptions.TemplateProcessingException;
import org.thymeleaf.processor.IAttributeNameProcessorMatcher;
import org.thymeleaf.processor.attr.AbstractLocalVariableDefinitionAttrProcessor;
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.StringUtils;
/**
*
* @author Daniel Fernández
*
* @since 1.0
*
*/
public abstract class AbstractStandardLocalVariableDefinitionAttrProcessor
extends AbstractLocalVariableDefinitionAttrProcessor {
protected AbstractStandardLocalVariableDefinitionAttrProcessor(final IAttributeNameProcessorMatcher matcher) {
super(matcher);
}
protected AbstractStandardLocalVariableDefinitionAttrProcessor(final String attributeName) {
super(attributeName);
}
@Override
protected final Map<String, Object> getNewLocalVariables(
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 + "\"");
}
Arguments assignationExecutionArguments = arguments;
final Map<String,Object> newLocalVariables = new HashMap<String,Object>(assignations.size() + 1, 1.0f);
for (final Assignation assignation : assignations) {
final IStandardExpression leftExpr = assignation.getLeft();
final Object leftValue = leftExpr.execute(configuration, assignationExecutionArguments);
final IStandardExpression rightExpr = assignation.getRight();
final Object rightValue = rightExpr.execute(configuration, assignationExecutionArguments);
final String newVariableName = (leftValue == null? null : leftValue.toString());
if (StringUtils.isEmptyOrWhitespace(newVariableName)) {
throw new TemplateProcessingException(
"Variable name expression evaluated as null or empty: \"" + leftExpr + "\"");
}
// Creating a new Arguments object allows the reuse of variables in, for example, th:with expressions.
assignationExecutionArguments =
assignationExecutionArguments.addLocalVariables(Collections.singletonMap(newVariableName, rightValue));
newLocalVariables.put(newVariableName, rightValue);
}
return newLocalVariables;
}
}