import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

public class HeaderMetadataAggregator {

public static void main(String[] args) {

if (args.length != 1) {

System.out.println("Usage: java HeaderMetadataAggregator <file_path>");

return;

}

String filePath = args[0];

Map<String, Integer> headerCounts = new HashMap<>();

Map<String, String> headerValues = new HashMap<>();

try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {

String line;

while ((line = reader.readLine()) != null) {

// Split the line by comma (or other delimiter) to extract header and value

String[] parts = line.split(",");

if (parts.length >= 2) {

String header = parts[0].trim(); // Extract header and remove leading/trailing spaces

String value = parts[1].trim(); // Extract value and remove leading/trailing spaces

// Update header counts

headerCounts.put(header, headerCounts.getOrDefault(header, 0) + 1);

//Store header values

headerValues.put(header, value);

} else {

System.err.println("Skipping invalid line: " + line); //Handle invalid lines

}

}

} catch (IOException e) {

System.err.println("Error reading file: " + e.getMessage());

return;

}

//Print the results

System.out.println("Header Counts:");

for (Map.Entry<String, Integer> entry : headerCounts.entrySet()) {

System.out.println(entry.getKey() + ": " + entry.getValue());

}

System.out.println("\nHeader Values:");

for (Map.Entry<String, String> entry : headerValues.entrySet()) {

System.out.println(entry.getKey() + ": " + entry.getValue());

}

}

}