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package Chapter4.util;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.Iterator;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.json.JSONException;
import org.json.JSONObject;
public class TweetFileProcessor implements Iterator<JSONObject>{
protected BufferedReader fileBuffer;
protected boolean endOfFile;
protected String nextLine;
public TweetFileProcessor(File f){
endOfFile = false;
InputStreamReader isr;
BufferedReader br = null;
try {
isr = new InputStreamReader(new FileInputStream(f), "UTF-8");
br = new BufferedReader(isr);
nextLine = br.readLine();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
endOfFile = true;
} catch (FileNotFoundException e) {
e.printStackTrace();
endOfFile = true;
} catch (IOException e) {
e.printStackTrace();
endOfFile = true;
}
finally{
fileBuffer = br;
}
}
@Override
public boolean hasNext() {
return !endOfFile;
}
@Override
public JSONObject next() {
JSONObject obj = null;
try {
obj = new JSONObject(nextLine);
} catch (JSONException ex) {
Logger.getLogger(TweetFileProcessor.class.getName()).log(Level.SEVERE, null, ex);
}
try {
nextLine = fileBuffer.readLine();
if(nextLine == null){
endOfFile = true;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return obj;
}
@Override
public void remove() throws UnsupportedOperationException{
throw new UnsupportedOperationException();
}
}
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