/*
 * Jalview - A Sequence Alignment Editor and Viewer (Version 2.8)
 * Copyright (C) 2012 J Procter, AM Waterhouse, LM Lui, J Engelhardt, G Barton, M Clamp, S Searle
 * 
 * This file is part of Jalview.
 * 
 * Jalview 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.
 *  
 * Jalview 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 Jalview.  If not, see <http://www.gnu.org/licenses/>.
 */
package jalview.ws;

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

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;

/**
 * Helpful procedures for working with services via HTTPClient
 * @author jimp
 *
 */
public class HttpClientUtils
{
  /**
   * do a minimal HTTP post with URL-Encoded parameters passed in the Query
   * string
   * 
   * @param postUrl
   * @param vals
   * @return Reader containing content, if any, or null if no entity returned.
   * @throws IOException
   * @throws ClientProtocolException
   * @throws Exception
   */
  public static BufferedReader doHttpUrlPost(String postUrl,
          List<NameValuePair> vals) throws ClientProtocolException,
          IOException
  {
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost(postUrl);
    UrlEncodedFormEntity ue = new UrlEncodedFormEntity(vals, "UTF-8");
    httppost.setEntity(ue);
    HttpResponse response = httpclient.execute(httppost);
    HttpEntity resEntity = response.getEntity();

    if (resEntity != null)
    {
      BufferedReader r = new BufferedReader(new InputStreamReader(
              resEntity.getContent()));
      return r;
    }
    else
    {
      return null;
    }
  }

}