/*
* =============================================================================
*
* 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.spring4.processor.attr;
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.spring4.naming.SpringContextVariableNames;
import org.thymeleaf.standard.expression.IStandardExpression;
import org.thymeleaf.standard.expression.IStandardExpressionParser;
import org.thymeleaf.standard.expression.StandardExpressions;
import org.thymeleaf.standard.expression.VariableExpression;
import org.thymeleaf.standard.processor.attr.AbstractStandardSelectionAttrProcessor;
/**
* Specifies an object to use on a <form>
*
* @author Daniel Fernández
* @since 1.0
*/
public final class SpringObjectAttrProcessor
extends AbstractStandardSelectionAttrProcessor {
public static final int ATTR_PRECEDENCE = 500;
public static final String ATTR_NAME = "object";
public SpringObjectAttrProcessor() {
super(ATTR_NAME);
}
@Override
public int getPrecedence() {
return ATTR_PRECEDENCE;
}
@Override
protected void validateSelectionValue(final Arguments arguments, final Element element,
final String attributeName, final String attributeValue, final IStandardExpression expression) {
if (expression == null || !(expression instanceof VariableExpression)) {
throw new TemplateProcessingException(
"The expression used for object selection is " + expression + ", which is not valid: " +
"only variable expressions (${...}) are allowed in '" + attributeName + "' attributes in " +
"Spring-enabled environments.");
}
}
@Override
protected Map<String, Object> getAdditionalLocalVariables(
final Arguments arguments, final Element element, final String attributeName) {
final Map<String, Object> previousAdditionalLocalVariables =
super.getAdditionalLocalVariables(arguments, element, attributeName);
final Map<String,Object> additionalLocalVariables =
new HashMap<String, Object>(previousAdditionalLocalVariables.size() + 3);
additionalLocalVariables.putAll(previousAdditionalLocalVariables);
final String attributeValue = element.getAttributeValue(attributeName);
final Configuration configuration = arguments.getConfiguration();
final IStandardExpressionParser expressionParser = StandardExpressions.getExpressionParser(configuration);
final VariableExpression varExpression =
(VariableExpression) expressionParser.parseExpression(arguments.getConfiguration(), arguments, attributeValue);
additionalLocalVariables.put(SpringContextVariableNames.SPRING_BOUND_OBJECT_EXPRESSION, varExpression);
// Added also with the deprecated name, for backwards compatibility
additionalLocalVariables.put(SpringContextVariableNames.SPRING_FORM_COMMAND_VALUE, varExpression);
return additionalLocalVariables;
}
}