com.synclio.hawk.TutorialRouteBuilder.java Source code

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Here is the source code for com.synclio.hawk.TutorialRouteBuilder.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 com.synclio.hawk;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Iterator;

import javax.xml.namespace.NamespaceContext;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;

import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.gae.http.GHttpException;
import org.apache.camel.component.gae.mail.GMailBinding;
import org.apache.camel.processor.aggregate.AggregationStrategy;
import org.apache.commons.io.IOUtils;

import com.google.appengine.api.urlfetch.HTTPMethod;
import com.google.appengine.api.urlfetch.HTTPRequest;
import com.google.appengine.api.urlfetch.HTTPResponse;
import com.google.appengine.api.urlfetch.URLFetchService;
import com.google.appengine.api.urlfetch.URLFetchServiceFactory;

public class TutorialRouteBuilder extends RouteBuilder {

    @Override
    public void configure() throws Exception {
        from("ghttp:///weather").process(new RequestProcessor()).marshal().serialization().to("gtask://default")
                .unmarshal().serialization().process(new ResponseProcessor());

        from("gtask://default").unmarshal().serialization().process(new Processor() {
            @Override
            public void process(Exchange exchange) throws Exception {
                ReportData data = exchange.getIn().getBody(ReportData.class);

                URLFetchService urlFetch = URLFetchServiceFactory.getURLFetchService();
                HTTPRequest req = new HTTPRequest(new URL("http://where.yahooapis.com/v1/places.q(" + data.getCity()
                        + ")?appid=0b4twNzV34GzaTHevW1SzEcnzG4Nyuhq6pvnSKZS.28kCqUw31jPRApe6_niElSL_waLc2M-"),
                        HTTPMethod.GET);
                HTTPResponse resp = urlFetch.fetch(req);

                Document doc = toDocument(IOUtils.toInputStream(new String(resp.getContent())));
                XPathFactory xpfactory = XPathFactory.newInstance();
                XPath xpath = xpfactory.newXPath();
                try {
                    System.out.print(xpath.evaluate("//places/place[1]/woeid/text()", doc));
                    System.out.print(new String(resp.getContent()));

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

        });
        //         .setHeader(Exchange.HTTP_METHOD,constant("GET"))
        //         .enrich("ghttp://where.yahooapis.com/v1/places.q(Chennai)?appid=0b4twNzV34GzaTHevW1SzEcnzG4Nyuhq6pvnSKZS.28kCqUw31jPRApe6_niElSL_waLc2M-")         .setHeader(GMailBinding.GMAIL_SUBJECT, constant("Weather report"))
        //         .setHeader(GMailBinding.GMAIL_SENDER, ReportData.requestor())
        //         .setHeader(GMailBinding.GMAIL_TO, ReportData.recipient())
        //         .process(new ReportGenerator())
        //         .to("gmail://default");
    }

    private static AggregationStrategy reportDataAggregator() {
        return new AggregationStrategy() {
            public Exchange aggregate(Exchange reportExchange, Exchange weatherExchange) {
                ReportData reportData = reportExchange.getIn().getBody(ReportData.class);
                try {
                    System.out.print(IOUtils.toString(weatherExchange.getIn().getBody(InputStream.class)));
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                reportData.setWeather(toDocument(weatherExchange.getIn().getBody(InputStream.class)));
                return reportExchange;
            }
        };
    }

    // As GAE have trouble to load the  javax.xml.transform.stax.StAXSource which is used the XmlConverter
    // Now we just do the transformation ourself.
    private static DocumentBuilderFactory createDocumentBuilderFactory() {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        factory.setNamespaceAware(true);
        factory.setIgnoringElementContentWhitespace(true);
        factory.setIgnoringComments(true);
        return factory;
    }

    private static Document toDocument(InputStream stream) {
        DocumentBuilderFactory factory = createDocumentBuilderFactory();
        try {
            Document doc = factory.newDocumentBuilder().parse(stream);
            return doc;
        } catch (Exception ex) {
            throw new RuntimeCamelException(ex);
        }
    }

}