/*
* Copyright (c) 2013 Christopher Thunes
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.brewtab.ircbot.applets;
import java.net.MalformedURLException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import com.brewtab.irc.User;
import com.brewtab.irc.client.Channel;
import com.brewtab.ircbot.util.URLBuilder;
public class WolframAlphaApplet implements BotApplet {
private static final Logger log = LoggerFactory.getLogger(WolframAlphaApplet.class);
private DocumentBuilder documentBuilder;
private XPath xpath;
private String appid;
public WolframAlphaApplet(String appid) {
try {
this.documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
} catch (ParserConfigurationException e) {
throw new RuntimeException(e);
}
this.xpath = XPathFactory.newInstance().newXPath();
this.appid = appid;
}
@Override
public void run(Channel channel, User from, String command, String[] args, String unparsed) {
URLBuilder url;
String query = unparsed;
boolean foundResult = false;
/* Search for a valid result at the following paths in this order */
String[] resultSearchPaths = { "//pod[@primary]/subpod/plaintext", "//pod[2]/subpod/plaintext",
"//pod[2]/subpod/img/@src" };
if (query.trim().length() == 0) {
channel.write("Missing query");
return;
}
try {
url = new URLBuilder("http://api.wolframalpha.com/v2/query");
} catch (MalformedURLException e) {
throw new RuntimeException(e);
}
url.setParameter("appid", this.appid);
url.setParameter("reinterpret", "true");
url.setParameter("input", query);
try {
Document doc = this.documentBuilder.parse(url.toString());
String success = this.xpath.evaluate("/queryresult/@success", doc);
if (success.equals("true")) {
for (String path : resultSearchPaths) {
String result = this.xpath.evaluate(path, doc);
if (!result.equals("")) {
channel.writeMultiple(result.split("\n"));
foundResult = true;
break;
}
}
if (foundResult == false) {
channel.write("Could not get results");
}
} else {
channel.write("Could not interpret query");
}
} catch (Exception e) {
log.error("caught exception while parsing results", e);
return;
}
}
}