org.wisepersist.gradle.plugins.gwt.internal.GwtVersion Maven / Gradle / Ivy

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package org.wisepersist.gradle.plugins.gwt.internal;

import static java.lang.String.format;

/**
 * A representation of a parsed GWT version string.
 */
public final class GwtVersion {

	private static final String PARSING_ERROR_MESSAGE_FORMAT = "GWT version %s can not be parsed. Valid versions must have the format major.minor.patch where major and minor are positive integer numbers.";

	private final int major;

	private final int minor;

	private final String patch;

	private GwtVersion(final int major, final int minor, final String patch) {
		this.major = major;
		this.minor = minor;
		this.patch = patch;
	}

	/**
	 * @param gwtVersion the gwt version string to be parsed
	 * @return a newly created {@linkplain GwtVersion} instance representing the parsed GWT version string argument, or {@code null} if parsing failed
	 */
	public static GwtVersion parseOrNull(final String gwtVersion) {
		try {
			return GwtVersion.parse(gwtVersion);
		} catch (final IllegalArgumentException e) {
			return null;
		}
	}

	/**
	 * @param gwtVersion the gwt version string to be parsed
	 * @return a newly created {@linkplain GwtVersion} instance representing the parsed GWT version string argument
	 * @throws IllegalArgumentException if any of the passed arguments are invalid
	 */
	public static GwtVersion parse(final String gwtVersion) {
		if ((gwtVersion != null) && !gwtVersion.isEmpty()) {
			try {
				final String[] versionParts = gwtVersion.split("\\.", 3);
				if (versionParts.length >= 3) {
					return new GwtVersion(Integer.parseUnsignedInt(versionParts[0]),
							Integer.parseUnsignedInt(versionParts[1]),
							versionParts[2]);
				} else if (versionParts.length >= 2) {
					return new GwtVersion(Integer.parseUnsignedInt(versionParts[0]),
							Integer.parseUnsignedInt(versionParts[1]),
							"0");
				}
			} catch (final NumberFormatException e) {
				throw new IllegalArgumentException(format(PARSING_ERROR_MESSAGE_FORMAT, gwtVersion), e);
			}
			throw new IllegalArgumentException(format(PARSING_ERROR_MESSAGE_FORMAT, gwtVersion));
		}
		throw new IllegalArgumentException("GWT version is is null or empty.");
	}

	public int getMajor() {
		return major;
	}

	public int getMinor() {
		return minor;
	}

	public String getPatch() {
		return patch;
	}

	/**
	 * @return the original parsed string
	 */
	@Override
	public String toString() {
		return format("%d.%d.%s", major, minor, patch);
	}
}