JavaVersion.java

package net.ftb.util.winreg;

import java.util.Comparator;

import lombok.Getter;
import net.ftb.log.Logger;
import net.ftb.util.ComparableVersion;

public class JavaVersion
{
	public ComparableVersion comparableVersion;
	public String origVersion;
	@Getter
	protected int major = -1, minor = -1, revision = -1, update = -1;

	public static JavaVersion createJavaVersion (String version)
	{
		try
		{
			return new JavaVersion(version, false);
		}
		catch (Exception e)
		{
			return null;
		}
	}

	/**
	 *
	 * @param str String containing output of java -version command
	 * @param full Boolean to indicate if str is full output or only version string
	 * @throws Exception
	 */
	protected JavaVersion (String str, boolean full) throws Exception
	{
		if (full)
		{
			String[] tokens = str.split("\"");
			if (tokens.length < 2)
			{
				throw new Exception("Input string unsupported format");
			}
			else
			{
				this.origVersion = tokens[1];
			}
		}
		else
		{
			this.origVersion = str;
		}
		parseVersionString();
		this.comparableVersion = new ComparableVersion(this.origVersion);
	}

	private void parseVersionString ()
	{
		String[] s = this.origVersion.split("[._-]");
		try
		{
			this.major = Integer.parseInt(s[0]);
			this.minor = s.length > 1 ? Integer.parseInt(s[1]) : 0;
			this.revision = s.length > 2 ? Integer.parseInt(s[2]) : 0;
			this.update = s.length > 3 ? Integer.parseInt(s[3]) : 0;
		}
		catch (NumberFormatException e)
		{
			Logger.logDebug("failed", e);
		}
	}

	/**
	 * @return Human-readable contents of this JavaInfo instance
	 ****************************************************************************/
	public String toString ()
	{
		return "Java Version: " + origVersion + " sorted as: " + this.verToString();
	}

	public String verToString ()
	{
		return major + "." + minor + "." + revision + "_" + update;
	}

	public static final Comparator<JavaVersion> PREFERRED_SORTING = new Comparator<JavaVersion>()
	{
		public int compare (JavaVersion j1, JavaVersion j2)
		{
			return j1.comparableVersion.compareTo(j2.comparableVersion);
		}
	};

	public boolean isOlder (JavaVersion j1)
	{
		return this.comparableVersion.isOlder(j1.comparableVersion);
	}

	public boolean isOlder (String str)
	{
		return this.isOlder(JavaVersion.createJavaVersion(str));
	}

	public boolean isSameVersion (JavaVersion j1)
	{
		return this.comparableVersion.isSameVersion(j1.comparableVersion);
	}

	public boolean isSameVersion (String str)
	{
		return this.isSameVersion(JavaVersion.createJavaVersion(str));
	}
}