org.thiesen.hafas.Client.java Source code

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Here is the source code for org.thiesen.hafas.Client.java

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/*
 * (c) Copyright 2011 Marcus Thiesen (marcus@thiesen.org)
 *
 *  This file is part of Bahn Client.
 *
 *  Bahn Client 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.
 *
 *  Bahn Client 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 gitant.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package org.thiesen.hafas;

import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

import org.apache.commons.io.IOUtils;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.thiesen.hafas.exception.ClientException;
import org.thiesen.hafas.exception.CommunicationException;
import org.thiesen.hafas.request.Request;
import org.thiesen.hafas.response.Response;

import com.google.common.base.Charsets;

public class Client {

    private final Configuration _config;
    private final DefaultHttpClient _httpClient;

    private Client(final Configuration config) {
        _config = config;

        _httpClient = new DefaultHttpClient(new ThreadSafeClientConnManager());

    }

    public static Client create(final Configuration config) {
        return new Client(config);
    }

    public Response doRequest(final Request request) throws ClientException {
        final HttpPost postMethod = new HttpPost(_config.getBaseUrl());

        try {
            final String requestString = request.makeStringRepresentation(_config);

            System.out.println(requestString);
            postMethod.setEntity(new StringEntity(requestString, _config.getEncoding().name()));
        } catch (final UnsupportedEncodingException e) {
            throw new Error("Invalid java, UTF-8 not supported", e);
        }

        try {
            final HttpResponse httpResponse = _httpClient.execute(postMethod);

            final StatusLine statusLine = httpResponse.getStatusLine();
            if (statusLine.getStatusCode() != 200) {
                handleErrorResponse(httpResponse, statusLine);
            } else {
                final String extractedResponseContent = extractResponseContent(httpResponse);

                return request.makeResponseFrom(extractedResponseContent);
            }

        } catch (final RuntimeException e) {
            postMethod.abort();
            throw new ClientException(e);
        } catch (final ClientProtocolException e) {
            throw new ClientException(e);
        } catch (final IOException e) {
            throw new ClientException(e);
        }

        throw new RuntimeException("Should never arrive here!");

    }

    private static void handleErrorResponse(final HttpResponse httpResponse, final StatusLine statusLine)
            throws CommunicationException, ClientException {
        try {
            final String contentString = extractResponseContent(httpResponse);

            throw new CommunicationException(statusLine.getStatusCode(), contentString);

        } catch (final IOException e) {
            throw new ClientException(e);
        }
    }

    private static String extractResponseContent(final HttpResponse httpResponse) throws IOException {
        final InputStream content = httpResponse.getEntity().getContent();

        final String contentString = IOUtils.toString(content);
        IOUtils.closeQuietly(content);
        return contentString;
    }

}