/*
* =============================================================================
*
* 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.standard.processor;
import java.util.Map;
import org.thymeleaf.context.ITemplateContext;
import org.thymeleaf.engine.AttributeName;
import org.thymeleaf.model.IProcessableElementTag;
import org.thymeleaf.processor.element.AbstractAttributeTagProcessor;
import org.thymeleaf.processor.element.IElementTagStructureHandler;
import org.thymeleaf.standard.expression.IStandardExpression;
import org.thymeleaf.standard.expression.IStandardExpressionParser;
import org.thymeleaf.standard.expression.StandardExpressions;
import org.thymeleaf.templatemode.TemplateMode;
/**
*
* @author Daniel Fernández
*
* @since 3.0.0
*
*/
public abstract class AbstractStandardTargetSelectionTagProcessor extends AbstractAttributeTagProcessor {
protected AbstractStandardTargetSelectionTagProcessor(
final TemplateMode templateMode, final String dialectPrefix, final String attrName, final int precedence) {
super(templateMode, dialectPrefix, null, false, attrName, true, precedence, true);
}
@Override
protected final void doProcess(
final ITemplateContext context,
final IProcessableElementTag tag,
final AttributeName attributeName, final String attributeValue,
final IElementTagStructureHandler structureHandler) {
final IStandardExpressionParser expressionParser = StandardExpressions.getExpressionParser(context.getConfiguration());
final IStandardExpression expression =
expressionParser.parseExpression(context, attributeValue);
validateSelectionValue(context, tag, attributeName, attributeValue, expression);
final Object newSelectionTarget = expression.execute(context);
final Map<String,Object> additionalLocalVariables =
computeAdditionalLocalVariables(context, tag, attributeName, attributeValue, expression);
if (additionalLocalVariables != null && additionalLocalVariables.size() > 0) {
for (final Map.Entry<String,Object> variableEntry : additionalLocalVariables.entrySet()) {
structureHandler.setLocalVariable(variableEntry.getKey(), variableEntry.getValue());
}
}
structureHandler.setSelectionTarget(newSelectionTarget);
}
protected void validateSelectionValue(
final ITemplateContext context,
final IProcessableElementTag tag,
final AttributeName attributeName, final String attributeValue,
final IStandardExpression expression) {
// Meant for being overridden. Nothing to be done in default implementation.
}
protected Map<String,Object> computeAdditionalLocalVariables(
final ITemplateContext context,
final IProcessableElementTag tag,
final AttributeName attributeName, final String attributeValue,
final IStandardExpression expression) {
// This method is meant to be overriden. By default, no local variables
// will be set.
return null;
}
}