es.juntadeandalucia.panelGestion.negocio.utiles.file.RemoteFileReader.java Source code

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Here is the source code for es.juntadeandalucia.panelGestion.negocio.utiles.file.RemoteFileReader.java

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/**
 * Empresa desarrolladora: GUADALTEL S.A.
 *
 * Autor: Junta de Andaluca
 *
 * Derechos de explotacin propiedad de la Junta de Andaluca.
 *
 * Este programa es software libre: usted tiene derecho a redistribuirlo y/o modificarlo bajo los trminos de la
 *
 * Licencia EUPL European Public License publicada por el organismo IDABC de la Comisin Europea, en su versin 1.0.
 * o posteriores.
 *
 * Este programa se distribuye de buena fe, pero SIN NINGUNA GARANT?A, incluso sin las presuntas garantas implcitas
 * de USABILIDAD o ADECUACIN A PROPSITO CONCRETO. Para mas informacin consulte la Licencia EUPL European Public
 * License.
 *
 * Usted recibe una copia de la Licencia EUPL European Public License junto con este programa, si por algn motivo no
 * le es posible visualizarla, puede consultarla en la siguiente URL: http://ec.europa.eu/idabc/servlets/Doc?id=31099
 *
 * You should have received a copy of the EUPL European Public License along with this program. If not, see
 * http://ec.europa.eu/idabc/servlets/Doc?id=31096
 *
 * Vous devez avoir reu une copie de la EUPL European Public License avec ce programme. Si non, voir
 * http://ec.europa.eu/idabc/servlets/Doc?id=30194
 *
 * Sie sollten eine Kopie der EUPL European Public License zusammen mit diesem Programm. Wenn nicht, finden Sie da
 * http://ec.europa.eu/idabc/servlets/Doc?id=29919
 */
/**
 * 
 */
package es.juntadeandalucia.panelGestion.negocio.utiles.file;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;

import org.apache.commons.httpclient.Credentials;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.UsernamePasswordCredentials;
import org.apache.commons.httpclient.auth.AuthScope;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.lang.StringUtils;

import es.juntadeandalucia.panelGestion.persistencia.entidades.Source;

/**
 * This class manages remote files
 *
 * @author GUADALTEL S.A
 */
public class RemoteFileReader implements FileReader {

    /**
     * The input stream reader of the remote source
     */
    private InputStreamReader inputStreamReader;

    private long numBytes;

    /**
     * Main constructor
     * @param source Source to connect
     * @throws IOException thrown by the reader constructor
     */
    public RemoteFileReader(Source source) throws IOException {
        // gets repository properties
        String sourceName = source.getName();
        String url = source.getUrl();
        String sourceUrl = url + sourceName;
        String user = source.getUser();
        String password = source.getPassword();

        HttpMethod getMethod = httpGet(sourceUrl, user, password);
        InputStream is = getMethod.getResponseBodyAsStream();

        // gets the reader
        inputStreamReader = new InputStreamReader(is);

        numBytes = ((GetMethod) getMethod).getResponseContentLength();
    }

    @Override
    public int countLines() {
        /* it always returns -1 in order to avoid large time reading
         * the source to get the num lines */
        return -1;
    }

    @Override
    public long getBytesLength() {
        return numBytes;
    }

    @Override
    public InputStreamReader getInputStreamReader() {
        return inputStreamReader;
    }

    public static GetMethod httpGet(String url, String user, String password) throws HttpException, IOException {
        // http client
        HttpClient client = new HttpClient();

        // credentials
        if (!StringUtils.isEmpty(user) || !StringUtils.isEmpty(password)) {
            Credentials creds = new UsernamePasswordCredentials(user, password);
            client.getState().setCredentials(AuthScope.ANY, creds);
        }

        // executes get method
        HttpMethod getMethod = new GetMethod(url);
        client.executeMethod(getMethod);

        return (GetMethod) getMethod;
    }

    public static InputStream getInputStream(URL url, String user, String password)
            throws HttpException, IOException {
        InputStream inputStream;
        if (StringUtils.isEmpty(user) && StringUtils.isEmpty(password)) {
            inputStream = url.openConnection().getInputStream();
        } else {
            HttpMethod getMethod = httpGet(url.toExternalForm(), user, password);
            inputStream = getMethod.getResponseBodyAsStream();
        }
        return inputStream;
    }
}