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package io;
import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;
import data.Tweet;
import data.TwitterJsonDeserializer;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
/**
* Reads tweets from an InputStream.
*
* @author Peter Wu
*/
public class TweetReader implements ITweetReader {
private final InputStream is;
private final BufferedReader reader;
private final Gson gson;
public TweetReader(InputStream is) {
if (is == null) {
throw new NullPointerException();
}
this.is = is;
reader = new BufferedReader(new InputStreamReader(is));
gson = TwitterJsonDeserializer.getGsonBuilder().create();
}
@Override
public Tweet getTweet() throws IOException {
String line = reader.readLine();
Tweet tweet = null;
if (line != null) {
try {
tweet = gson.fromJson(line, Tweet.class);
} catch (JsonSyntaxException ex) {
debugTweet(line, ex);
throw ex;
}
}
return tweet;
}
@Override
public void close() {
try {
is.close();
} catch (IOException ex) {
}
}
private void debugTweet(String line, JsonSyntaxException ex) {
System.err.println("Faulty line: " + line);
ex.printStackTrace();
}
}
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