/*
* Created on 1-Dec-2004
*
*/
package net.sf.jabref.net;
import java.awt.Component;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.net.CookieHandler;
import javax.swing.ProgressMonitorInputStream;
/**
* @author Erik Putrycz erik.putrycz-at-nrc-cnrc.gc.ca
*/
public class URLDownload {
private URL source;
private URLConnection con = null;
private File dest;
private Component parent;
private String mimeType = null;
private String content = null;
private CookieHandler cm;
/**
* URL download to a string. After construction, call download() and then getStringContent().
* @param _source The URL to download.
*/
public URLDownload(URL _source) {
this.source = _source;
this.dest = null;
this.parent = null;
setCookieHandler();
}
/**
* URL download to a file. After construction, call download().
* @param _parent Parent component.
* @param _source The URL to download.
* @param _dest The file to download into.
*/
public URLDownload(Component _parent, URL _source, File _dest) {
source = _source;
dest = _dest;
parent = _parent;
setCookieHandler();
}
private void setCookieHandler() {
try {
// This should set up JabRef to receive cookies properly
if ((cm = CookieHandler.getDefault()) == null) {
cm = new CookieHandlerImpl();
CookieHandler.setDefault(cm);
}
} catch (SecurityException e) {
// Setting or getting the system default cookie handler is forbidden
// In this case cookie handling is not possible.
}
}
public String getMimeType() {
return mimeType;
}
public URLConnection getURLConnection() {
return con;
}
/**
* This method can be used after download() has been called, to get the contents
* of the download, provided this URLDownload was created with the constructor
* that takes no File argument.
*/
public String getStringContent() {
return content;
}
public void openConnectionOnly() throws IOException {
con = source.openConnection();
con.setRequestProperty("User-Agent", "Jabref");
mimeType = con.getContentType();
}
public void download() throws IOException {
if (con == null) {
con = source.openConnection();
con.setRequestProperty("User-Agent", "Jabref");
mimeType = con.getContentType();
}
if (dest != null)
downloadToFile();
else
downloadToString();
}
protected void downloadToString() throws IOException {
InputStream input = new BufferedInputStream(con.getInputStream());
Writer output = new StringWriter();
try
{
copy(input, output);
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
try
{
input.close();
output.close();
}
catch (Exception e)
{
}
}
content = output.toString();
}
protected void downloadToFile() throws IOException {
InputStream input = new BufferedInputStream(con.getInputStream());
OutputStream output = new BufferedOutputStream(new FileOutputStream(dest));
try
{
copy(input, output);
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
try
{
input.close();
output.close();
}
catch (Exception e)
{
}
}
}
public void copy(InputStream in, OutputStream out) throws IOException
{
InputStream _in = new ProgressMonitorInputStream(parent, "Downloading " + source.toString(), in);
byte[] buffer = new byte[512];
while(true)
{
int bytesRead = _in.read(buffer);
if(bytesRead == -1) break;
out.write(buffer, 0, bytesRead);
}
}
public void copy(InputStream in, Writer out) throws IOException
{
InputStream _in = new ProgressMonitorInputStream(parent, "Downloading " + source.toString(), in);
BufferedReader read = new BufferedReader(new InputStreamReader(_in));
byte[] buffer = new byte[512];
String line;
while ((line = read.readLine()) != null) {
out.write(line);
out.write("\n");
}
}
}