eu.comvantage.dataintegration.DHMConnector.java Source code

Introduction

Here is the source code for eu.comvantage.dataintegration.DHMConnector.java

Source

/*
 * Copyright 2014 SAP SE
 * 
 * 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 eu.comvantage.dataintegration;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.entity.AbstractHttpEntity;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.HTTP;

import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.query.Syntax;
import com.hp.hpl.jena.update.UpdateException;

import eu.comvantage.dataintegration.data.Credentials;
import eu.comvantage.dataintegration.data.Endpoint;
import eu.comvantage.dataintegration.data.QueryResult;

public class DHMConnector {
    private Endpoint endpoint;
    private Credentials credentials;

    public DHMConnector(Endpoint endpoint) {
        this.endpoint = endpoint;
    }

    public DHMConnector(Endpoint endpoint, Credentials credentials) {
        this.endpoint = endpoint;
        this.credentials = credentials;
    }

    public HttpResponse query(String location, String arguments) {
        HttpResponse response = null;
        String queryString = location + "?" + arguments;
        queryString = endpoint.getEndpointURL() + "/" + queryString;

        try {
            HttpGet httpGet = new HttpGet(queryString);

            //      ByteArrayOutputStream b_out = new ByteArrayOutputStream();
            //      OutputStreamWriter wr = new OutputStreamWriter(b_out);
            //      wr.write(queryString);
            //      wr.flush();
            //      byte[] bytes = b_out.toByteArray() ;
            //      AbstractHttpEntity reqEntity = new ByteArrayEntity(bytes) ;
            //      eqEntity.setContentType("application/x-www-form-urlencoded") ;
            //      reqEntity.setContentEncoding(HTTP.UTF_8) ;
            //      httpPost.setEntity(reqEntity) ;
            HttpClient httpclient = new DefaultHttpClient();

            //set proxy if defined
            if (System.getProperty("http.proxyHost") != null) {
                HttpHost proxy = new HttpHost(System.getProperty("http.proxyHost"),
                        Integer.valueOf(System.getProperty("http.proxyPort")), "http");
                httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
            }

            try {
                System.out.println("DHMConnector, Command: " + queryString);
                response = httpclient.execute(httpGet);
                int responseCode = response.getStatusLine().getStatusCode();
                String responseMessage = response.getStatusLine().getReasonPhrase();

                if (responseCode == 204)
                    System.out.println("DHMConnector response: NO_CONTENT_204");
                if (responseCode == 200)
                    System.out.println("DHMConnector response: OK_200");
                if (responseCode == 404)
                    System.out.println("DHMConnector response: NOT_FOUND_404");

                //wr.close();
            } catch (IOException ex) {
                response = null;
                //throw new UpdateException(ex);
            }

        } catch (Exception e) {
            System.out.println("DHMConnector: Can't build HTTP GET object, arguments string is corrupted");
            //e.printStackTrace();
        }
        return response;
    }
}