WeatherMarshaller.java

/*
 * Copyright 2010 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.samples.testing.externalgateway;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;

import org.w3c.dom.Document;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.oxm.Marshaller;
import org.springframework.oxm.MarshallingFailureException;
import org.springframework.oxm.Unmarshaller;
import org.springframework.oxm.XmlMappingException;
import org.springframework.xml.transform.StringResult;
import org.springframework.xml.transform.StringSource;
import org.springframework.xml.xpath.XPathExpressionFactory;
/**
 *
 * @author Oleg Zhurakousky
 * @author Mark Fisher
 * @since SpringOne2GX - 2010, Chicago
 */
public class WeatherMarshaller implements Marshaller, Unmarshaller, InitializingBean {

	private static final TransformerFactory transformerFactory = TransformerFactory.newInstance();

	private Map<String, String> namespacePrefixes = new HashMap<String, String>();

	private String xpathPrefix = "/p:GetCityWeatherByZIPResponse/p:GetCityWeatherByZIPResult/";

	public Object unmarshal(Source source) throws IOException, XmlMappingException {

		//this.writeXml(((DOMSource)source).getNode().getOwnerDocument());
		DOMResult result = null;
		try {
			Transformer transformer = transformerFactory.newTransformer();
			result = new DOMResult();
			transformer.transform(source, result);
		} catch (Exception e) {
			throw new MarshallingFailureException("Failed to unmarshal SOAP Response", e);
		}
		Weather weather = new Weather();
		String expression = xpathPrefix + "p:City";
		String city = XPathExpressionFactory.createXPathExpression(expression, namespacePrefixes).evaluateAsString(result.getNode());
		weather.setCity(city);
		expression = xpathPrefix + "p:State";
		String state = XPathExpressionFactory.createXPathExpression(expression, namespacePrefixes).evaluateAsString(result.getNode());
		weather.setState(state);
		expression = xpathPrefix + "p:Temperature";
		String temperature = XPathExpressionFactory.createXPathExpression(expression, namespacePrefixes).evaluateAsString(result.getNode());
		weather.setTemperature(temperature);
		expression = xpathPrefix + "p:Description";
		String description = XPathExpressionFactory.createXPathExpression(expression, namespacePrefixes).evaluateAsString(result.getNode());
		weather.setDescription(description);
		return weather;
	}

	public boolean supports(Class<?> clazz) {
		System.out.println("Suppors");
		return false;
	}

	public void marshal(Object zip, Result result) throws IOException,
			XmlMappingException {
		String xmlString = "<weat:GetCityWeatherByZIP xmlns:weat=\"http://ws.cdyne.com/WeatherWS/\">" +
							"	<weat:ZIP>" + zip + "</weat:ZIP>" +
							"</weat:GetCityWeatherByZIP>";
		try {
			Transformer transformer = transformerFactory.newTransformer();
			transformer.transform(new StringSource(xmlString), result);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static final void writeXml(Document document) {
		Transformer transformer = createIndentingTransformer();

		transformer.setOutputProperty(OutputKeys.METHOD, "xml");

		try {
			StringResult streamResult = new StringResult();
			transformer.transform(new DOMSource(document), streamResult);
		} catch (Exception ex) {
			throw new IllegalStateException(ex);
		}
	}
	public static final Transformer createIndentingTransformer() {
		Transformer xformer;
		try {
			xformer = transformerFactory.newTransformer();
			xformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
			xformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
			xformer.setOutputProperty(OutputKeys.INDENT, "yes");
			xformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", String.valueOf(2));
		} catch (Exception ex) {
			throw new IllegalStateException(ex);
		}
		xformer.setOutputProperty(OutputKeys.INDENT, "yes");
		xformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
		return xformer;
	}

	public void afterPropertiesSet() throws Exception {
		namespacePrefixes.put("p", "http://ws.cdyne.com/WeatherWS/");
	}
}