messageidhelper.java

来自「OpenJMS是一个开源的Java Message Service API 1.」· Java 代码 · 共 90 行

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 */

package org.exolab.jms.util;


/**
 * Helper class for manipulating JMSMessageIDs
 *
 * @version     $Revision: 1.1 $ $Date: 2004/11/26 01:51:02 $
 * @author      <a href="mailto:[e-mail]">Tim Anderson</a>
 **/
public class MessageIdHelper {

    /**
     * Return the 'null' JMSMessageID.
     * This is the first Id recognised by OpenJMS, but not assigned
     * to messages.
     *
     * @return      String              the 'null' message Id
     */
    public static String getNull() {
        return NULL_ID;
    }

    /**
     * Generate a JMSMessageID
     *
     * @param       Id                 numeric representation of the Id
     * @return      String             the generated JMSMessageID
     */
    public static String generate(long Id) {
        return ID_PREFIX + Id;
    }

    /**
     * Convert a JMSMessageID to its long value
     *
     * @param       messageId           JMSMessageID to convert
     * @return      long                value of the JMSMessageID
     */
    public static long convert(String messageId) {
        // strip off 'ID:' prefix
        return Long.parseLong(messageId.substring(ID_PREFIX.length()));
    }

    private static final String ID_PREFIX = "ID:";
    private static final String NULL_ID = "ID:0";
}