[opencms-dev] Access Constants per Expression Laguage. Example: ${aCmsWorkplaceObject.constants.A_CONSTANT_NAME}

[Brabenetz, Harald]

The following Code-Fragments can be inserted into CmsWorkplace and CmsJspBean
It will be very useful for JSTL like

<c:choose>
	<c:when test="${wp.constants.ACTION_CANCEL==wp.action}">
.......
.......

I attached a simplified Example: ConstantsMap.java (JDK 1.4: ConstantsMap14.java)


################### Members: ##############################################################
   
    /** Map<ClassName, Constants<Const_Name, Const_Value>> */
    private static final Map<String, Map<String, Object>> m_constants = new HashMap<String, Map<String, Object>>();;

###########################################################################################

################### Functions: ############################################################

	/**
	 * Get all public final static Members of this Class-Object
	 * You can access it in JSTL and JSP 2.0 through the Expression Language.
	 * Example: ${aCmsWorkplaceObject.constants.A_CONSTANT_NAME}
	 *
	 * @return the value of a public static final Member
	 */
	public Map<String, Object> getConstants() {
		Map<String, Object> constants = m_constants.get(this.getClass().getName()); //needed for Child-Objects
		if (constants == null){
	        synchronized (this) {
				constants = m_constants.get(this.getClass().getName());
	    		if (constants == null){
	    			constants = getConstantsMap(this.getClass());
	    			m_constants.put(this.getClass().getName(), constants);
	    		}
	        }
		}
		return constants;
	}

	/**
	 * Get a Map of all Constants (public static final) in a Class-Object and his parents
	 * @param clazz The class and his Constants
	 * @return the Map
	 */
	public static Map<String, Object> getConstantsMap(Class clazz){
		Map<String, Object> result = new HashMap<String, Object>();
		java.lang.reflect.Field[] fields = clazz.getFields();
		for (java.lang.reflect.Field field : fields) {
			int modifier = field.getModifiers();
			if (java.lang.reflect.Modifier.isPublic(modifier) &&
				java.lang.reflect.Modifier.isStatic(modifier) &&
				java.lang.reflect.Modifier.isFinal(modifier))
			{
				try {
					result.put(field.getName(), field.get(null));
				}
				catch (IllegalAccessException e) {}
			}
		}
		return java.util.Collections.unmodifiableMap(result);
	}
###########################################################################################

Please send me a response.

With friendly regards,

Harald Brabenetz | Senior Consultant | BearingPoint | A-8141 Graz |
Seering 6 | Phone +43 - (0)316 - 8003 - 1250
<mailto:harald.brabenetz at bearingpoint.com> | <http://www.bearingpoint.de>



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