edu.pitt.dbmi.ipm.service.EntityStreamingOutput.java Source code

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Here is the source code for edu.pitt.dbmi.ipm.service.EntityStreamingOutput.java

Source

package edu.pitt.dbmi.ipm.service;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;

import javax.ws.rs.WebApplicationException;

import org.apache.http.HttpEntity;
import org.apache.http.client.HttpClient;

/**
 * Copyright (C) 2015  University of Pittsburgh
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 * 
 * Streams entity for downloading on client machine.
 * 
 * @author opm1
 * @version 1
 * @since Dec 8, 2015
 * 
 */
public class EntityStreamingOutput implements javax.ws.rs.core.StreamingOutput {
    private HttpEntity entity = null;
    private HttpClient httpclient = null;

    /**
     * 
     * @param httpclient - HttpClient
     * @param entity - HttpEntity
     */
    public EntityStreamingOutput(HttpClient httpclient, HttpEntity entity) {
        this.httpclient = httpclient;
        this.entity = entity;
    }

    /**
     * 
     * @return HttpEntity entity
     */
    public HttpEntity getEntity() {
        return entity;
    }

    /**
     * Writes to stream.
     */
    @Override
    public void write(OutputStream output) throws IOException, WebApplicationException {

        byte[] buffer = new byte[1024];
        int read = -1;
        InputStream instream = null;

        try {

            instream = entity.getContent();
            BufferedReader br = new BufferedReader(new InputStreamReader(instream));
            Writer writer = new BufferedWriter(new OutputStreamWriter(output));

            String line = null;
            while ((line = br.readLine()) != null) {
                line = line.replaceAll("\"", "");
                writer.write(line + "\n");
                writer.flush();
            }

        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {

            if (instream != null)
                instream.close();

            if (output != null)
                output.close();

            httpclient.getConnectionManager().shutdown();
        }

    }

}