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import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
public class ConfusionMatrixReader {
final static String DATAFILE_LOC = "confusion_matrix.txt";
final private HashMap<String, Integer> confusionMatrix = new HashMap<>();
final private HashMap<String, Integer> countMatrix = new HashMap<>();
public ConfusionMatrixReader() {
try {
readConfusionMatrix();
} catch (Exception ex) {
Logger.getLogger(ConfusionMatrixReader.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void readConfusionMatrix()
throws FileNotFoundException, IOException {
FileInputStream fis;
fis = new FileInputStream(DATAFILE_LOC);
BufferedReader in = new BufferedReader(new InputStreamReader(fis));
while (in.ready()) {
String line = in.readLine();
int space = line.lastIndexOf(' ');
String keys = line.substring(0, space);
try {
int count = Integer.parseInt(line.substring(space + 1));
confusionMatrix.put(keys, count);
String key = keys.substring(0, keys.indexOf('|'));
Integer value = countMatrix.get(key);
if (value == null) {
value = 0;
}
countMatrix.put(key, value + count);
} catch (NumberFormatException e) {
System.err.println("problems with string <" + line + ">");
}
}
}
/**
* Returns the count for the pair <error>|<correct> in the confusion matrix,
* e.g. "c|ct" is 36
*
* @param error
* @param correct
* @return
*/
public int getConfusionCount(String error, String correct) {
Integer count = confusionMatrix.get(error + "|" + correct);
return count == null ? 0 : count;
}
/**
* Given the error {@code error}, find the number of occurrences of the
* error.
*
* @param error
* @return
*/
public int getErrorsCount(String error) {
return countMatrix.getOrDefault(error, 0);
}
}
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