com.kurtraschke.wsf.gtfsrealtime.services.WSFVesselLocationService.java Source code

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Here is the source code for com.kurtraschke.wsf.gtfsrealtime.services.WSFVesselLocationService.java

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/*
 * Copyright (C) 2015 Kurt Raschke <kurt@kurtraschke.com>
 *
 * 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 com.kurtraschke.wsf.gtfsrealtime.services;

import com.google.common.collect.ImmutableList;

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.conn.HttpClientConnectionManager;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.transform.stream.StreamSource;

import gov.wa.wsdot.ferries.vessels.ArrayOfVesselLocationResponse;
import gov.wa.wsdot.ferries.vessels.VesselLocationResponse;

@Singleton
public class WSFVesselLocationService {

    @Inject
    @Named("WSF.apiaccesscode")
    String _apiAccessCode;

    @Inject
    HttpClientConnectionManager _connectionManager;

    Unmarshaller _um;

    public WSFVesselLocationService() throws JAXBException {
        JAXBContext jc = JAXBContext.newInstance(ArrayOfVesselLocationResponse.class);
        _um = jc.createUnmarshaller();
    }

    public List<VesselLocationResponse> getAllVessels() throws URISyntaxException, IOException, JAXBException {
        ImmutableList.Builder<VesselLocationResponse> allVessels = ImmutableList.builder();

        URI endpoint = new URIBuilder("http://www.wsdot.wa.gov/ferries/api/vessels/rest/vessellocations")
                .addParameter("apiaccesscode", _apiAccessCode).build();
        CloseableHttpClient httpclient = HttpClients.custom().setConnectionManager(_connectionManager).build();
        HttpGet request = new HttpGet(endpoint);
        request.addHeader("Accept", "text/xml");

        try (CloseableHttpResponse response = httpclient.execute(request)) {
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                try (InputStream instream = entity.getContent()) {
                    JAXBElement<ArrayOfVesselLocationResponse> responseArray;
                    responseArray = _um.unmarshal(new StreamSource(instream), ArrayOfVesselLocationResponse.class);

                    allVessels.addAll(responseArray.getValue().getVesselLocationResponse());
                }
            }
        }
        return allVessels.build();
    }
}