identifiers.java

来自「OpenJMS是一个开源的Java Message Service API 1.」· Java 代码 · 共 180 行

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 */

package org.exolab.jms.selector;


/**
 * Utility methods for JMS message header identifiers
 *
 * @version     $Revision: 1.1 $ $Date: 2004/11/26 01:50:44 $
 * @author      <a href="mailto:[e-mail]">Tim Anderson</a>
 */
public final class Identifiers {

    /**
     * Prefix for identifiers available via message methods
     */
    public static final String JMS_PREFIX = "JMS";

    /**
     * Prefix for identifiers specified by the JMS standard
     */
    public static final String JMSX_PREFIX = "JMSX";

    /**
     * Prefix for provider specific identifiers
     */
    public static final String JMS_PROVIDER_PREFIX = "JMS_";

    /**
     * The JMSDeliveryMode identifier
     */
    public static final String JMS_DELIVERY_MODE = "JMSDeliveryMode";

    /**
     * The JMSPriority identifier
     */
    public static final String JMS_PRIORITY = "JMSPriority";

    /**
     * The JMSMessageID identifier
     */
    public static final String JMS_MESSAGE_ID = "JMSMessageID";

    /**
     * The JMSTimestamp identifier
     */
    public static final String JMS_TIMESTAMP = "JMSTimestamp";

    /**
     * The JMSCorrelationID identifier
     */
    public static final String JMS_CORRELATION_ID = "JMSCorrelationID";

    /**
     * The JMSType identifier
     */
    public static final String JMS_TYPE = "JMSType";

    /**
     * The persistent delivery mode
     */
    public static final String PERSISTENT = "PERSISTENT";

    /**
     * The non-persistent delivery mode
     */
    public static final String NON_PERSISTENT = "NON_PERSISTENT";


    /**
     * Private constructor
     */
    private Identifiers() {
    }

    /**
     * Determines if an identifier is a JMS identifier (not a JMSX or
     * provider specific identifier)
     *
     * @param name the identifier name
     * @return <code>true</code> if the identifier is a JMS identifier,
     * otherwise <code>false</code>
     */
    public static boolean isJMSIdentifier(final String name) {
        boolean result = false;
        if (name.startsWith(JMS_PREFIX)
            && !(name.startsWith(JMSX_PREFIX)
                 || name.startsWith(JMS_PROVIDER_PREFIX))) {
            result = true;
        }
        return result;
    }

    /**
     * Determines if a JMS identifier is valid in selectors
     *
     * @param name the identifier name
     * @return <code>true</code> if the identifier may be selected upon,
     * otherwise <code>false</code>
     */
    public static boolean isQueryableJMSIdentifier(final String name) {
        return (name.equals(JMS_DELIVERY_MODE)
                || name.equals(JMS_PRIORITY)
                || name.equals(JMS_TIMESTAMP)
                || name.equals(JMS_MESSAGE_ID)
                || name.equals(JMS_CORRELATION_ID)
                || name.equals(JMS_TYPE));
    }

    /**
     * Determines if a JMS identifier is a string
     *
     * @param name the identifier name
     * @return <code>true</code> if the identifier is a string, otherwise
     * <code>false</code>
     */
    public static boolean isString(final String name) {
        return (name.equals(JMS_MESSAGE_ID)
                || name.equals(JMS_CORRELATION_ID)
                || name.equals(JMS_TYPE)
                || name.equals(JMS_DELIVERY_MODE));
        // delivery mode is an integer which must be mapped to a string
        // (see '3.8.1.3 Special Notes' of the spec).
    }

    /**
     * Determines if a JMS identifier is numeric
     *
     * @param name the identifier name
     * @return <code>true</code> if the identifier is numeric, otherwise
     * <code>false</code>
     */
    public static boolean isNumeric(final String name) {
        return (name.equals(JMS_PRIORITY)
                || name.equals(JMS_TIMESTAMP));
    }

} //-- Identifiers