eu.prestoprime.plugin.ltfsarchiver.client.LTFSClient.java Source code

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Here is the source code for eu.prestoprime.plugin.ltfsarchiver.client.LTFSClient.java

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/**
 * LTFSClient.java
 * Author: Francesco Rosso (rosso@eurix.it)
 * 
 * This file is part of PrestoPRIME Preservation Platform (P4).
 * 
 * Copyright (C) 2009-2012 EURIX Srl, Torino, Italy
 *  
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package eu.prestoprime.plugin.ltfsarchiver.client;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class LTFSClient {

    private static final Logger logger = LoggerFactory.getLogger(LTFSClient.class);

    public LTFSResponse execute(LTFSRequest request) throws LTFSException {
        LTFSResponse response;
        do {
            response = this.executeRequest(request);
            LTFSRequest nextRequest = request.nextRequest(response);

            if (nextRequest != null && nextRequest == request) {
                try {
                    Thread.sleep(5000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            request = nextRequest;
        } while (request != null);
        return response;
    }

    private LTFSResponse executeRequest(LTFSRequest ltfsRequest) throws LTFSException {
        logger.debug("Calling: " + ltfsRequest);

        try {
            HttpClient client = new DefaultHttpClient();
            HttpGet request = new HttpGet(ltfsRequest.toURL());
            HttpResponse response = client.execute(request);
            if (response.getStatusLine().getStatusCode() == 200) {
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent()));
                    StringBuffer sb = new StringBuffer();
                    String line;
                    while ((line = reader.readLine()) != null)
                        sb.append(line.trim());
                    reader.close();
                    EntityUtils.consume(entity);

                    logger.debug("Received: " + sb);

                    LTFSResponse ltfsResponse;
                    switch (response.getHeaders("content-Type")[0].getValue()) {
                    case "text/plain":
                    default:
                        ltfsResponse = new LTFSResponse(sb.toString());
                        break;
                    case "application/json":
                        ltfsResponse = new LTFSResponse(new JSONObject(sb.toString()));
                        break;
                    }
                    return ltfsResponse;
                } else {
                    throw new LTFSException("LTFSArchiver returns with empty entity...");
                }
            } else {
                throw new LTFSException(
                        "LTFSArchiver returns with error " + response.getStatusLine().getStatusCode() + "...");
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
            throw new LTFSException("Unable to contact the LTFSArchiver Web Service...");
        } catch (IOException e) {
            e.printStackTrace();
            throw new LTFSException("Unable to read the response...");
        } catch (JSONException e) {
            e.printStackTrace();
            throw new LTFSException("Unable to parse JSON response...");
        }
    }
}