CSV Parsing

PTSet.java

package com.keods.gamaster;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Stream;

/**
 * Set of product targets
 * Created by dys on 02/03/15.
 */
public class PTSet {

	private List<ProductTarget> productTargets = new ArrayList<>();

	private enum CsvValueType {
		min, max
	}

	public static PTSet readFromCsvFile(Path path) throws IOException {
		class CsvColDescriptor{
			String elemName;
			CsvValueType type;
			CsvColDescriptor(String elemName, CsvValueType type) {
				this.elemName = elemName;
				this.type = type;
			}
			void read(String s, ProductTarget pt){
				ElementTarget et = pt.getNotNullElementTarget(elemName);
				try {
					switch (type) {
						case min: et.min = Float.parseFloat(s); break;
						case max: et.max = Float.parseFloat(s); break;
					}
				} catch (NumberFormatException e) {/* nothing to do here*/}
			}
		}
		try (Stream<String[]> lineStream = Files.lines(path).map(s -> s.split(";"))) {
			PTSet ptSet = new PTSet();
			CsvColDescriptor[] colDescriptors;
			Iterator<String[]> lines = lineStream.iterator();

			Pattern eMinMaxPattern = Pattern.compile("(?i)^(\\w+)\\s+(min|max)");
			colDescriptors = Arrays.stream(lines.next()).map(name -> {
				Matcher matcher = eMinMaxPattern.matcher(name);
				if (!matcher.find()) return null;
				return new CsvColDescriptor(
						matcher.group(1),
						CsvValueType.valueOf(matcher.group(2).toLowerCase())
				);
			}).toArray(CsvColDescriptor[]::new);

			lines.forEachRemaining(line -> {
				ProductTarget pt = new ProductTarget();
				pt.num = Integer.parseInt(line[0]);
				for (int i = 1; i < line.length && i<colDescriptors.length; i++) {
					if(colDescriptors[i]!=null) colDescriptors[i].read(line[i], pt);
				}
				ptSet.productTargets.add(pt);
			});

			System.out.format("%d lines in set\n", ptSet.productTargets.size());
			return ptSet;
		}
	}
}