package com.fp.frontend.filter;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

/**
 * Clase para envolver los filtros gzip
 * 
 * @author Jorge Vaca
 * @version 2.1
 */
public class GZIPResponseWrapper extends HttpServletResponseWrapper {

    protected HttpServletResponse origResponse = null;

    protected ServletOutputStream stream = null;

    protected PrintWriter writer = null;

    public GZIPResponseWrapper(HttpServletResponse response) {
        super(response);
        origResponse = response;
    }

    public ServletOutputStream createOutputStream() throws IOException {
        return (new GZIPResponseStream(origResponse));
    }

    public void finishResponse() {
        try {
            if (writer != null) {
                writer.close();
            } else {
                if (stream != null) {
                    stream.close();
                }
            }
        } catch (IOException e) {
        }
    }

    /**
     * 
     * @throws IOException
     */
    @Override
    public void flushBuffer() throws IOException {
        stream.flush();
    }

    /**
     * 
     * @return
     * @throws IOException
     */
    @Override
    public ServletOutputStream getOutputStream() throws IOException {
        if (writer != null) {
            throw new IllegalStateException("getWriter() has already been called!");
        }
        if (stream == null) {
            stream = createOutputStream();
        }
        return (stream);
    }

    /**
     * 
     * @return
     * @throws IOException
     */
    @Override
    public PrintWriter getWriter() throws IOException {
        if (writer != null) {
            return (writer);
        }
        if (stream != null) {
            throw new IllegalStateException("getOutputStream() has already been called!");
        }
        stream = createOutputStream();
        writer = new PrintWriter(new OutputStreamWriter(stream, "UTF-8"));
        return (writer);
    }

    /**
     * 
     * @param length
     */
    @Override
    public void setContentLength(int length) {
    }
}