public void convertToImage(GraphConfiguration config) throws IOException {
File outputDirectory = new File(config.getOutputDirectory());
if (!outputDirectory.exists()) {
LOGGER.info(
"Output directory does not exist yet. Creating it: " + outputDirectory.getAbsolutePath());
FileUtils.forceMkdir(outputDirectory);
}
File imageFile = new File(outputDirectory, config.getGraphName() + ".png");
File dotFile = new File(outputDirectory, config.getGraphName() + ".dot");
StringBuilder builder = new StringBuilder();
BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(dotFile)));
String line = null;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
postDotCode(config, builder.toString(), imageFile);
}
private int postDotCode(GraphConfiguration config, String dotCode, File imageFile)
throws IOException {
HttpClient httpclient = new DefaultHttpClient();
try {
HttpPost post = new HttpPost("https://chart.googleapis.com/chart");
List<NameValuePair> postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("cht", "gv"));
postParameters.add(new BasicNameValuePair("chl", dotCode));
String width = config.getGraphWidth();
String height = config.getGraphHeight();
if (StringUtils.isNotEmpty(width) && StringUtils.isNotEmpty(height)) {
String dimensions = config.getGraphWidth() + "x" + config.getGraphHeight();
LOGGER.info("Adding dimensions: " + dimensions);
// postParameters.add(new BasicNameValuePair("chs", dimensions));
}
post.setEntity(new UrlEncodedFormEntity(postParameters));
LOGGER.info("Sending request..");
HttpResponse response = httpclient.execute(post);
LOGGER.info("Response: " + response);
HttpEntity responseEntity = response.getEntity();
BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(imageFile));
responseEntity.writeTo(outputStream);
outputStream.close();
return response.getStatusLine().getStatusCode();
} finally {
// When HttpClient instance is no longer needed,
// shut down the connection manager to ensure
// immediate deallocation of all system resources
httpclient.getConnectionManager().shutdown();
}
}