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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/* ********************************************************************
 * Copyright (c) 1998-2001 Xerox Corporation,
 *               2002 Palo Alto Research Center, Incorporated (PARC).
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * Contributors:
 *     Xerox/PARC     initial implementation
 * *******************************************************************/

package org.aspectj.bridge;

import java.io.IOException;
import java.net.URL;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;

/** release-specific version information */
public class Version {

    // generated from build/lib/BridgeVersion.java

    /** default version value for development version */
    public static final String DEVELOPMENT = "DEVELOPMENT";
    // VersionUptodate.java depends on this value

    /** default time value for development version */
    public static final long NOTIME = 0L;

    public static final String UNREPLACED_TEXT = "${project.version}";
    public static final String UNREPLACED_TIME_TEXT = "${version.time_text}";

    /** set by build script */
    private static String text;// = "DEVELOPMENT";
    // VersionUptodate.java scans for "static final String text = "

    /**
      * Time text set by build script using SIMPLE_DATE_FORMAT.
      * (if DEVELOPMENT version, invalid)
      */
    private static String time_text;// = "Tuesday Jan 15, 2019 at 00:53:54 GMT";

    /**
      * time in seconds-since-... format, used by programmatic clients.
      * (if DEVELOPMENT version, NOTIME)
      */
    private static long time = -1; // -1 == uninitialized

	/** format used by build script to set time_text */
    public static final String SIMPLE_DATE_FORMAT = "EEEE MMM d, yyyy 'at' HH:mm:ss z";

    static {
    	try {
	    	URL resource = Version.class.getResource("version.properties");
	    	Properties p = new Properties();
			p.load(resource.openStream());
			text = p.getProperty("version.text","");
			if (text.equals(UNREPLACED_TEXT)) {
				text="DEVELOPMENT";
			}
			time_text = p.getProperty("version.time_text","");
			if (time_text.equals(UNREPLACED_TIME_TEXT)) {
				time_text="";
			}
		} catch (IOException e) {
			text="DEVELOPMENT";
			time_text = "";
		}
    }

    public static long getTime() {
    	if (time==-1) {
    		long foundTime = NOTIME;
    	    // if not DEVELOPMENT version, read time text using format used to set time
            try {
                SimpleDateFormat format = new SimpleDateFormat(SIMPLE_DATE_FORMAT);
                ParsePosition pos = new ParsePosition(0);
                Date date = format.parse(time_text, pos);
                if (date!=null) foundTime = date.getTime();
            } catch (Throwable t) {
            }
            time = foundTime;
    	}
    	return time;
    }

    /**
     * Test whether the version is as specified by any first argument.
     * Emit text to System.err on failure
     * @param args String[] with first argument equal to Version.text
     * @see Version#text
     */
    public static void main(String[] args) {
        if ((null != args) && (0 < args.length)) {
            if (!Version.text.equals(args[0])) {
                System.err.println("version expected: \""
                                + args[0]
                                + "\" actual=\""
                                + Version.text
                                + "\"");
            }
        }
    }

	public static String getTimeText() {
		return time_text;
	}

	public static String getText() {
		return text;
	}
}