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package main;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import mining.TwitterApi;
import mining.TwitterApi.Builder;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Basic contained class for a Pair, because Java doesn't provide this.
*
* @author Maurice Laveaux
*/
class Parameter {
public Parameter(String variable, String value) {
this.variable = variable;
this.value = value;
}
public String variable;
public String value;
}
/**
* A single request/response command that executes once.
*
* @author Maurice Laveaux
*/
public class RequestCommand implements ICommand {
/**
* The api to execute requests on
*/
private final TwitterApi m_api;
private final String m_command;
/**
* The list of parameters that are executed
*/
private final ArrayList<Parameter> m_parameters;
/**
* Contruct a RequestCommand that executes the request and writes the
* results into a file.
*
* @param api the main twitter api.
* @param command the command of the twitter api f.e. users/show.
* @param parameters the parameters for the executed command.
*/
public RequestCommand(TwitterApi api, String command, String[] parameters) {
m_api = api;
m_command = command;
m_parameters = new ArrayList();
if (parameters.length < 1) {
throw new IllegalArgumentException("Not enough parameters specified.");
}
for (String param : parameters) {
// parse the parameter to a variable with a value.
m_parameters.add(parseParam(param));
}
}
@Override
public void execute() {
try {
// create the building object with the command.
Builder builder = m_api.build(m_command);
// add every parameter to the builder.
for (Parameter param : m_parameters) {
builder = builder.param(param.variable, param.value);
}
JSONObject result = builder.request();
// TODO: add the results to the main database.
// For now write to a file
File file = new File("database.txt");
FileWriter writer = new FileWriter(file, true);
writer.write("\n\r" + result.toString());
writer.flush();
System.out.println(result.toString(4));
} catch (JSONException ex) {
/* cannot happen */
throw new RuntimeException(ex);
} catch (IOException ex) {
// TODO: when ratelimit reached, add event back to queue.
throw new RuntimeException(ex);
}
}
/**
* Parses the input string to a parameter.
*
* @param input A single line in the form variable=value.
* @return A pair of strings for variable and value.
*/
private Parameter parseParam(final String input) {
String[] seperated = input.split("=");
if (seperated.length < 2) {
throw new IllegalArgumentException("parameter did not contain <variable>=<value>.");
}
return new Parameter(seperated[0], seperated[1]);
}
}
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