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import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Arrays;
/*
* @author
* Kian Agheli
*
* References:
*
* Date:
* 2024-05-08
*
* Purpose of class:
* Read from and interpret CSV files.
*/
public class CSVReader extends Reader {
String[] header; // A CSV file has-a header. One line, multiple fields.
/* Array of Hash map from header to value for each
line past the header. */
ArrayList<HashMap<String,String>> body; // A CSV file has-a body. Multiple lines, multiple fields.
public CSVReader(File file) {
super(file); // Call parent constructor
body = new ArrayList<HashMap<String,String>>();
parse();
}
/*
* Parse CSV file.
*/
public void parse() {
String[] lines = this.getContents().split("\n");
this.header = lines[0].split(",");
System.out.printf("%d\n", header.length);
/* Iterate over all lines of the body. */
for (int i = 1; i < lines.length; i++) {
String[] fields = lines[i].split(",");
HashMap<String,String> map = new HashMap<String,String>();
/* For each of the columns, add the associated
value in this row. */
for (int j = 0; j < header.length; j++) {
map.put(header[j], fields[j]);
}
body.add(map);
}
for (String head : this.header) {
System.out.printf("%s\t", head);
}
System.out.println();
for (HashMap<String,String> map : body) {
for (int i = 0; i < header.length; i++) {
System.out.printf("%s\t", map.get(header[i]));
}
System.out.println();
}
}
}
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