/*
* Copyright 2002-2016 the original author or authors.
*
* 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.springframework.integration.config.xml;
import org.w3c.dom.Element;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.beans.factory.xml.AbstractBeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.integration.config.ExpressionFactoryBean;
import org.springframework.integration.transaction.DefaultTransactionSynchronizationFactory;
import org.springframework.integration.transaction.ExpressionEvaluatingTransactionSynchronizationProcessor;
import org.springframework.util.StringUtils;
import org.springframework.util.xml.DomUtils;
/**
* Parser for transaction-synchronizatioin-factory element
*
* @author Oleg Zhurakousky
* @since 2.2
*
*/
public class TransactionSynchronizationFactoryParser extends
AbstractBeanDefinitionParser {
@Override
protected AbstractBeanDefinition parseInternal(Element element, ParserContext parserContext) {
BeanDefinitionBuilder syncFactoryBuilder =
BeanDefinitionBuilder.genericBeanDefinition(DefaultTransactionSynchronizationFactory.class);
Element beforeCommitElement = DomUtils.getChildElementByTagName(element, "before-commit");
Element afterCommitElement = DomUtils.getChildElementByTagName(element, "after-commit");
Element afterRollbackElement = DomUtils.getChildElementByTagName(element, "after-rollback");
if (this.elementsNotDefined(beforeCommitElement, afterCommitElement, afterRollbackElement)) {
parserContext.getReaderContext().error("At least one sub-element " +
"('before-commit', 'after-commit' and/or 'after-rollback') must be defined", element);
}
BeanDefinitionBuilder expressionProcessor =
BeanDefinitionBuilder.genericBeanDefinition(ExpressionEvaluatingTransactionSynchronizationProcessor.class);
this.processSubElement(beforeCommitElement, parserContext, expressionProcessor, "beforeCommit");
this.processSubElement(afterCommitElement, parserContext, expressionProcessor, "afterCommit");
this.processSubElement(afterRollbackElement, parserContext, expressionProcessor, "afterRollback");
syncFactoryBuilder.addConstructorArgValue(expressionProcessor.getBeanDefinition());
return syncFactoryBuilder.getBeanDefinition();
}
private void processSubElement(Element element, ParserContext parserContext, BeanDefinitionBuilder expressionProcessor, String elementPrefix) {
if (element != null) {
String expression = element.getAttribute("expression");
String channel = element.getAttribute("channel");
if (this.attributesNotDefined(expression, channel)) {
parserContext.getReaderContext().error("At least one attribute " +
"('expression' and/or 'channel') must be defined", element);
}
if (StringUtils.hasText(expression)) {
RootBeanDefinition expressionDef = new RootBeanDefinition(ExpressionFactoryBean.class);
expressionDef.getConstructorArgumentValues().addGenericArgumentValue(expression);
expressionProcessor.addPropertyValue(elementPrefix + "Expression", expressionDef);
}
if (StringUtils.hasText(channel)) {
expressionProcessor.addPropertyReference(elementPrefix + "Channel", channel);
}
else {
expressionProcessor.addPropertyReference(elementPrefix + "Channel", "nullChannel");
}
}
}
private boolean elementsNotDefined(Element... elements) {
for (Object element : elements) {
if (element != null) {
return false;
}
}
return true;
}
private boolean attributesNotDefined(String... attributes) {
for (String attribute : attributes) {
if (StringUtils.hasText(attribute)) {
return false;
}
}
return true;
}
}