panda.doc.markdown.html.WebSequencePlugin Maven / Gradle / Ivy

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Panda Core is the core module of Panda Framework, it contains commonly used utility classes similar to apache-commons.

There is a newer version: 1.8.0

package panda.doc.markdown.html;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;

import panda.doc.markdown.Plugin;

public class WebSequencePlugin extends Plugin {

	public WebSequencePlugin() {
		super("sequence");
	}

	@Override
	public void emit(final StringBuilder out, final List lines, final Map params) {
		String style = params.get("style");
		if (style == null) {
			style = "default";
		}
		String content = null;
		for (String line : lines) {
			if (content == null) {
				content = line;
			}
			else {
				content = content + "\n" + line;
			}
		}

		content = content + "\n";

		try {
			String link = getSequenceDiagram(content, style);

			if (link != null) {
				out.append("");
			}
		}
		catch (IOException e) {
			throw new RuntimeException("Error while rendering websequenceplugin", e);
		}
	}

	private String getSequenceDiagram(String text, String style) throws IOException {
		// Build parameter string
		String data = "style=" + style + "&message=" + URLEncoder.encode(text, "UTF-8") + "&apiVersion=1";

		// Send the request
		URL url = new URL("http://www.websequencediagrams.com");
		URLConnection conn = url.openConnection();
		conn.setDoOutput(true);
		OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());

		// write parameters
		writer.write(data);
		writer.flush();

		// Get the response
		StringBuilder answer = new StringBuilder();
		BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
		String line;
		while ((line = reader.readLine()) != null) {
			answer.append(line);
		}
		writer.close();
		reader.close();

		String json = answer.toString();

		int start = json.indexOf("?png=");
		int end = json.indexOf("\"", start);

		if (start != -1 && end != -1) {
			String surl = "http://www.websequencediagrams.com/" + json.substring(start, end);
			return surl;
		}
		return null;
	}
}