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CDS4j Core

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package com.sap.cds.impl.parser;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.sap.cds.reflect.impl.CdsVersion;

/**
 * Parses and returns the comparable version object. Supported version patterns
 * are:

 * 1.22.333 - simple version,

 * 01.022.0333 - leading zeroes are ignored,

 * 1.22.033-ms.4 - milestone build number
 *
 */
public class VersionParser {

	private static final String VERSION_PATTERN = "(\\d+)\\.(\\d+)\\.(\\d+)(?:\\-[ms]{2}\\.(\\d+))?";

	public static CdsVersion parse(String versionString) {
		Pattern pattern = Pattern.compile(VERSION_PATTERN);
		Matcher matcher = pattern.matcher(versionString);

		if (!matcher.matches()) {
			throw new IllegalArgumentException(String.format("Unable to parse version string '%s'", versionString));
		}

		int major = Integer.valueOf(matcher.group(1));
		int minor = Integer.valueOf(matcher.group(2));
		int micro = Integer.valueOf(matcher.group(3));
		int buildNumber = matcher.group(4) == null ? 0 : Integer.valueOf(matcher.group(4));

		return new CdsVersion(major, minor, micro, buildNumber);
	}
}