br.usp.poli.lta.cereda.macro.util.CommonUtils.java Source code

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Here is the source code for br.usp.poli.lta.cereda.macro.util.CommonUtils.java

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/**
* ------------------------------------------------------
*    Laboratrio de Linguagens e Tcnicas Adaptativas
*       Escola Politcnica, Universidade So Paulo
* ------------------------------------------------------
* 
* 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.
* 
**/
package br.usp.poli.lta.cereda.macro.util;

import br.usp.poli.lta.cereda.macro.model.exceptions.TextRetrievalException;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.Charset;
import org.apache.commons.io.FileUtils;

/**
 * Implementa alguns mtodos comuns.
 * @author Paulo Roberto Massa Cereda
 * @version 1.0
 * @since 1.0
 */
public class CommonUtils {

    /**
     * Obtm o contedo a partir do caminho informado.
     * @param path Caminho a ser pesquisado.
     * @return Contedo do caminho informado.
     * @throws TextRetrievalException Um erro ocorreu ao obter o arquivo.
     */
    public static String get(String path) throws TextRetrievalException {

        try {

            // cria uma nova URL e obtm o fluxo de bytes
            URL url = new URL(path);
            InputStream stream = url.openStream();

            // cria um arquivo temporrio, copia o fluxo de bytes para ele, l
            // o contedo e remove o arquivo temporrio
            File temp = new File(
                    System.getProperty("user.home").concat(java.io.File.separator).concat("get-tmp.txt"));
            FileUtils.copyInputStreamToFile(stream, temp);
            String output = FileUtils.readFileToString(temp, Charset.forName("UTF-8"));
            temp.delete();

            // retorna o contedo
            return output;

        } catch (MalformedURLException mue) {

            // a URL  invlida, lanar exceo
            throw new TextRetrievalException("A URL informada  invlida.");
        } catch (IOException ioe) {

            // o documento no foi encontrado, lanar exceo
            throw new TextRetrievalException("O documento informado na URL no foi encontrado.");
        }

    }

}