/*
* JBoss, Home of Professional Open Source
* Copyright 2013, Red Hat, Inc. and/or its affiliates, and individual
* contributors by the @authors tag. See the copyright.txt in the
* distribution for a full listing of individual contributors.
*
* 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.switchyard.quickstarts.demo.multiapp.service;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.stream.StreamSource;
import org.switchyard.annotations.Transformer;
import org.switchyard.quickstarts.demo.multiapp.Order;
import org.switchyard.quickstarts.demo.multiapp.OrderAck;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import java.io.StringReader;
public class Transformers {
// Element names in XML document
private static final String ORDER_ID = "orderId";
private static final String ITEM_ID = "itemId";
private static final String QUANTITY = "quantity";
/**
* Transform from a DOM element to an Order instance.
* <p/>
* No need to specify the "to" type because Order is a concrete type.
* @param from Order element.
* @return Order instance.
*/
@Transformer(from = "{urn:switchyard-quickstart-demo:multiapp:1.0}submitOrder")
public Order transform(Element from) {
return new Order()
.setOrderId(getElementValue(from, ORDER_ID))
.setItemId(getElementValue(from, ITEM_ID))
.setQuantity(Integer.valueOf(getElementValue(from, QUANTITY)));
}
/**
* Transform from an OrderAck to an Element.
* <p/>
* No need to specify the "from" type because OrderAck is a concrete type.
* @param orderAck OrderAck.
* @return Order response element.
*/
@Transformer(to = "{urn:switchyard-quickstart-demo:multiapp:1.0}submitOrderResponse")
public Element transform(OrderAck orderAck) {
StringBuffer ackXml = new StringBuffer()
.append("<orders:submitOrderResponse xmlns:orders=\"urn:switchyard-quickstart-demo:multiapp:1.0\">")
.append("<orderAck>")
.append("<orderId>" + orderAck.getOrderId() + "</orderId>")
.append("<accepted>" + orderAck.isAccepted() + "</accepted>")
.append("<status>" + orderAck.getStatus() + "</status>")
.append("</orderAck>")
.append("</orders:submitOrderResponse>");
return toElement(ackXml.toString());
}
/**
* Returns the text value of a child node of parent.
*/
private String getElementValue(Element parent, String elementName) {
String value = null;
NodeList nodes = parent.getElementsByTagName(elementName);
if (nodes.getLength() > 0) {
value = nodes.item(0).getChildNodes().item(0).getNodeValue();
}
return value;
}
private Element toElement(String xml) {
DOMResult dom = new DOMResult();
try {
TransformerFactory.newInstance().newTransformer().transform(
new StreamSource(new StringReader(xml)), dom);
} catch (Exception ex) {
ex.printStackTrace();
}
return ((Document) dom.getNode()).getDocumentElement();
}
}