/*
* 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.Collections;
import java.util.List;
import javax.xml.parsers.DocumentBuilderFactory;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConversionException;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.xml.xpath.XPathExpression;
import org.springframework.xml.xpath.XPathExpressionFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
*
* @author Oleg Zhurakousky
* @author Mark Fisher
* @since SpringOne2GX - 2010, Chicago
*/
public class TrafficHttpConverter implements HttpMessageConverter<Traffic> {
private List<MediaType> supportedMediaTypes = Collections.emptyList();
public boolean canRead(Class<?> clazz, MediaType mediaType) {
return Traffic.class.equals(clazz);
}
public boolean canWrite(Class<?> clazz, MediaType mediaType) {
return false;
}
public List<MediaType> getSupportedMediaTypes() {
return supportedMediaTypes;
}
public Traffic read(Class<? extends Traffic> clazz, HttpInputMessage inputMessage) throws IOException,
HttpMessageNotReadableException {
Traffic traffic = new Traffic();
try {
Document document =
DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(inputMessage.getBody());
XPathExpression titlesXp = XPathExpressionFactory.createXPathExpression("/ResultSet/Result[@type='incident']/Title");
List<Node> titles = titlesXp.evaluateAsNodeList(document);
XPathExpression descXp = XPathExpressionFactory.createXPathExpression("/ResultSet/Result[@type='incident']/Description");
List<Node> description = descXp.evaluateAsNodeList(document);
int counter = 0;
for (Node node : titles) {
traffic.addIncident(((Element)node).getTextContent(), ((Element)description.get(counter++)).getTextContent());
}
} catch (Exception e) {
throw new HttpMessageConversionException("Failed to convert response to: " + clazz, e);
}
return traffic;
}
public void write(Traffic t, MediaType contentType,
HttpOutputMessage outputMessage) throws IOException,
HttpMessageNotWritableException {
// for now this converter is only used for converting response
}
}