biz.c24.io.spring.integration.config.XPathHeaderEnricherParser.java Source code

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Here is the source code for biz.c24.io.spring.integration.config.XPathHeaderEnricherParser.java

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/*
 * Copyright 2011 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 biz.c24.io.spring.integration.config;

import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.ManagedMap;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.integration.config.xml.AbstractTransformerParser;
import org.springframework.integration.config.xml.IntegrationNamespaceUtils;
import org.springframework.util.StringUtils;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * Parser for <xpath-header-enricher> elements.
 *
 * @author Mark Fisher
 * @since 2.0
 */
public class XPathHeaderEnricherParser extends AbstractTransformerParser {

    @Override
    protected final String getTransformerClassName() {
        return "biz.c24.io.spring.integration.transformer.C24XPathHeaderEnricher";
    }

    @Override
    protected void parseTransformer(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
        ManagedMap<String, Object> headers = new ManagedMap<String, Object>();
        this.processHeaders(element, headers, parserContext);
        builder.addConstructorArgValue(headers);
        IntegrationNamespaceUtils.setValueIfAttributeDefined(builder, element, "default-overwrite");
        IntegrationNamespaceUtils.setValueIfAttributeDefined(builder, element, "should-skip-nulls");
    }

    protected void processHeaders(Element element, ManagedMap<String, Object> headers,
            ParserContext parserContext) {
        Object source = parserContext.extractSource(element);
        NodeList childNodes = element.getChildNodes();
        for (int i = 0; i < childNodes.getLength(); i++) {
            Node node = childNodes.item(i);
            if (node.getNodeType() == Node.ELEMENT_NODE) {
                Element headerElement = (Element) node;
                String elementName = node.getLocalName();
                if ("header".equals(elementName)) {
                    BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition(
                            "biz.c24.io.spring.integration.transformer.C24XPathHeaderEnricher$XPathExpressionEvaluatingHeaderValueMessageProcessor");
                    String expressionString = headerElement.getAttribute("xpath-statement");
                    String expressionRef = headerElement.getAttribute("xpath-statement-ref");
                    boolean isExpressionString = StringUtils.hasText(expressionString);
                    boolean isExpressionRef = StringUtils.hasText(expressionRef);
                    if (!(isExpressionString ^ isExpressionRef)) {
                        parserContext.getReaderContext().error(
                                "Exactly one of the 'xpath-statement' or 'xpath-statement-ref' attributes is required.",
                                source);
                    }
                    if (isExpressionString) {
                        builder.addConstructorArgValue(expressionString);
                    } else {
                        builder.addConstructorArgReference(expressionRef);
                    }
                    IntegrationNamespaceUtils.setValueIfAttributeDefined(builder, headerElement, "evaluation-type");
                    IntegrationNamespaceUtils.setValueIfAttributeDefined(builder, headerElement, "overwrite");
                    String headerName = headerElement.getAttribute("name");
                    headers.put(headerName, builder.getBeanDefinition());
                }
            }
        }
    }

}