import com.wolfram.alpha.WAEngine;

import com.wolfram.alpha.WAException;

import com.wolfram.alpha.WAPlainText;

import com.wolfram.alpha.WAPod;

import com.wolfram.alpha.WAQuery;

import com.wolfram.alpha.WAQueryResult;

import com.wolfram.alpha.WASubpod;

/*

* A simple example program demonstrating the WolframAlpha.jar library. The program

* performs a query given on the command line and prints out the resulting pod titles

* and plaintext content.

*

* You will need to insert your appid into the code. To compile or run this program

* you will need the following dependent libraries on your classpath (including

* WolframAlpha.jar, of course):

*

* commons-codec-1.3.jar

* httpclient-4.0.1.jar

* httpcore-4.0.1.jar

* commons-logging.jar

*

* These libraries are widely available on the Internet. You can probably use other version

* numbers than these, although these are the versions I used.

*

* To launch from the command line, do the following (these classpath specifications assume

* that the WolframAlpha.jar file and the four other dependent jars listed above are in the same

* directory as AlphaAPISample.class):

*

* Windows:

*

* java -classpath .;* AlphaAPISample "sin x"

*

* Linux, Mac OSX:

*

* java -classpath .:* AlphaAPISample "sin x"

*/

public class AlphaAPISample {

// PUT YOUR APPID HERE:

private static String appid = "XXXXX";

public static void main(String[] args) {

// Use "pi" as the default query, or caller can supply it as the lone command-line argument.

String input = "pi";

if (args.length > 0)

input = args[0];

// The WAEngine is a factory for creating WAQuery objects,

// and it also used to perform those queries. You can set properties of

// the WAEngine (such as the desired API output format types) that will

// be inherited by all WAQuery objects created from it. Most applications

// will only need to crete one WAEngine object, which is used throughout

// the life of the application.

WAEngine engine = new WAEngine();

// These properties will be set in all the WAQuery objects created from this WAEngine.

engine.setAppID(appid);

engine.addFormat("plaintext");

// Create the query.

WAQuery query = engine.createQuery();

// Set properties of the query.

query.setInput(input);

try {

// For educational purposes, print out the URL we are about to send:

System.out.println("Query URL:");

System.out.println(engine.toURL(query));

System.out.println("");

// This sends the URL to the Wolfram|Alpha server, gets the XML result

// and parses it into an object hierarchy held by the WAQueryResult object.

WAQueryResult queryResult = engine.performQuery(query);

if (queryResult.isError()) {

System.out.println("Query error");

System.out.println(" error code: " + queryResult.getErrorCode());

System.out.println(" error message: " + queryResult.getErrorMessage());

} else if (!queryResult.isSuccess()) {

System.out.println("Query was not understood; no results available.");

} else {

// Got a result.

System.out.println("Successful query. Pods follow:\n");

for (WAPod pod : queryResult.getPods()) {

if (!pod.isError()) {

System.out.println(pod.getTitle());

System.out.println("------------");

for (WASubpod subpod : pod.getSubpods()) {

for (Object element : subpod.getContents()) {

if (element instanceof WAPlainText) {

System.out.println(((WAPlainText) element).getText());

System.out.println("");

}

}

}

System.out.println("");

}

}

// We ignored many other types of Wolfram|Alpha output, such as warnings, assumptions, etc.

// These can be obtained by methods of WAQueryResult or objects deeper in the hierarchy.

}

} catch (WAException e) {

e.printStackTrace();

}

}

}