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import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Arrays;
/*
* @author
* Kian Agheli
*
* References:
*
* Date:
* 2024-05-20
*
* Purpose of class:
* Read from and interpret CSV files.
*/
public class CSVReader extends Reader {
private String[] header; // A CSV file has-a header. One line, multiple fields.
// Array of HashMaps. Headers are keys, values are on each line of the CSV following the header.
private ArrayList<HashMap<String,String>> body; // A CSV file has-a body. Multiple lines, multiple fields.
public CSVReader(File file) {
super(file); // Call parent constructor
/* Construct the body to be filled. */
body = new ArrayList<HashMap<String,String>>();
/* Parse the contents of the file, store in body. */
parse();
}
/**
* Parse CSV file.
*/
public void parse() {
/* Split the input on newlines. */
String[] lines = this.getContents().split("\n");
/* Split the first line by commas, assign to header array. */
this.header = lines[0].split(",");
/* Iterate over all lines of the body.
First line is header, count from 1 instead of 0. */
for (int i = 1; i < lines.length; i++) {
/* Some lines have commas within parentheses.
Angkor,"/South East Asian (Thai, Khmer, Lao)/Looped",100
Remove everything within parentheses. We need to escape
not on a language level, but on a function call level.
Double-backslash for a literal backslash, which is then
used to escape the parentheses in the regex library. */
lines[i] = lines[i].replaceAll("\\(.*\\)", "");
/* CSV, Comma-Separated Values. */
String[] fields = lines[i].split(",");
/* Allocate a new HashMap for the given line of the CSV. */
HashMap<String,String> map = new HashMap<String,String>();
/* Associate each of the line's fields with its header. */
for (int j = 0; j < header.length; j++) {
map.put(header[j], fields[j]);
}
/* Add the HashMap to the list. */
body.add(map);
}
}
/**
* @return the length of the body.
*/
public int getLength() {
return body.size();
}
/**
* @return the value associated with the given key on the given line.
*/
public String get(int i, String key) {
return body.get(i).get(key);
}
}
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