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An API for working with native system APIs, with a higher-level interface.

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package com.github.bloodshura.ignitium.ntv.pattern;

import com.github.bloodshura.ignitium.collection.view.XView;
import com.github.bloodshura.ignitium.math.BaseConverter;
import com.github.bloodshura.ignitium.tokenizer.SimpleTokenizer;
import com.github.bloodshura.ignitium.util.XApi;

import javax.annotation.Nonnull;

public class HexPattern extends AbstractSequentialPattern {
	public HexPattern(@Nonnull byte... pattern) {
		super(true, pattern);
	}

	public HexPattern(@Nonnull int... pattern) {
		super(true, toPattern(pattern));
	}

	public HexPattern(@Nonnull String pattern) {
		super(true, toPattern(pattern));
	}

	private static byte[] toPattern(int[] intPattern) {
		byte[] pattern = new byte[intPattern.length];

		for (int i = 0; i < intPattern.length; i++) {
			pattern[i] = (byte) intPattern[i];
		}

		return pattern;
	}

	private static byte[] toPattern(String pattern) {
		SimpleTokenizer tokenizer = new SimpleTokenizer();
		XView tokens = tokenizer.tokenize(pattern);
		byte[] hexPattern = new byte[tokens.size()];
		int index = 0;

		for (String token : tokens) {
			if (token.equals("??")) {
				hexPattern[index] = 0x0;
			} else if (token.length() == 2) {
				try {
					// Can't use Byte::parseByte 'cause it won't allow "unsigned byte" values (> 127), so we use
					// Short::parseShort and simply downcast it to byte
					hexPattern[index] = (byte) Short.parseShort(token, BaseConverter.HEXADECIMAL);
				} catch (NumberFormatException exception) {
					XApi.raise("Found unrecognized value \"" + token + "\" on input pattern (value must consist of 2 hexadecimal digits)");
				}
			} else {
				XApi.raise("Found unrecognized value \"" + token + "\" on input pattern (value must consist of 2 hexadecimal digits)");
			}

			index++;
		}

		return hexPattern;
	}
}