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DynamicAttributesDescriptor.javaAPI DocGlassfish v2 API7153Fri May 04 22:31:20 BST 2007com.sun.enterprise.deployment

DynamicAttributesDescriptor

public class DynamicAttributesDescriptor extends Observable implements Serializable
This class is a value holder for dynamic attributes. Dynamic attributes can be added, queried and removed from this value holder. Attributes are identified by a string key.
author
Jerome Dochez

Fields Summary
private Map
dynamicAttributes
Constructors Summary
Methods Summary
public voidaddExtraAttribute(java.lang.String name, java.lang.Object value)
Add a new dynamic attribte

param
name the attribute name
param
value the attribute value

        if (value==null) {
            return;
        }
	if (dynamicAttributes == null) {
	    dynamicAttributes = new Hashtable();
	}
        dynamicAttributes.put(name, value);
        changed();
private voidchanged()
notify our observers we have changed

        setChanged();
        notifyObservers();
public java.lang.ObjectgetExtraAttribute(java.lang.String name)
Obtain a dynamic attribute from the repository

param
name the attribute name
return
the attribute value of null of non existent

        if (dynamicAttributes == null) {
            return null;
        }
        return dynamicAttributes.get(name);
public java.util.MapgetExtraAttributes()
Direct acess to the dynamic attributes repository

return
the Map of dynamic attributes

	if (dynamicAttributes == null) {
	    dynamicAttributes = new Hashtable();
	}
	return dynamicAttributes;
public voidprint(java.lang.StringBuffer toStringBuffer)

return
a meaningfull string about ourself This method is invoked by toString() method. This method can be overwritten by any descriptor which inherits this class to self describe. This pattern is adopted to imporve the performance of S1AS 8.0 which avoids creation of several String objects in toString() method. When toString() method is called on a Descriptor object, the toString method of this class is called. The toString method of this class invokes print(StringBuffer) method. If the Descriptor object overrides print method, its method will be invoked. For better performance, care should be taken to use print method on all descriptors instead of printing object itself (which calls to toString). For example Iterator itr = getDeploymentExtensions(); if (itr!=null && itr.hasNext()) { do { sb.append("\n Deployment Extension : ").append(itr.next()); } while (itr.hasNext()); } should probably read as below. Iterator itr = getDeploymentExtensions(); if (itr!=null && itr.hasNext()) { do { sb.append("\n Deployment Extension : "); ((Descriptor) itr.next()).print(sb); } while (itr.hasNext()); }

        if (dynamicAttributes==null) {
            toStringBuffer.append("<== No attribute ==>");
        }  else {
           toStringBuffer.append("==>Dynamic Attribute");
           Set keys = dynamicAttributes.keySet();
           for (Iterator itr = keys.iterator();itr.hasNext();) {
               String keyName = (String) itr.next();
               Object o = getExtraAttribute(keyName);
	       if (o instanceof Object[]) {
		   Object[] objects = (Object[]) o;
		   for (int i=0;i<objects.length;i++) {
		       toStringBuffer.append("\n Indexed prop name ").append(keyName).append("[").append(i).append("] = ");
                       if(objects[i] instanceof DynamicAttributesDescriptor)
                            ((DynamicAttributesDescriptor)objects[i]).print(toStringBuffer);
                       else
                            toStringBuffer.append(objects[i]);
		   }
	       } else {
		   toStringBuffer.append("\n  Property name = ").append(keyName).append(" value = ");
                   if(o instanceof DynamicAttributesDescriptor)
                            ((DynamicAttributesDescriptor)o).print(toStringBuffer);
                       else
                            toStringBuffer.append(o);
               }
           }
	   toStringBuffer.append("\n<==End");
           return ;
        }
public voidremoveExtraAttribute(java.lang.String name)
Removes a dynamic attribute from the repository

param
name the attribute name

        if (dynamicAttributes == null) {
            return;
        } 
        dynamicAttributes.remove(name);
        changed();
public java.lang.StringtoString()

return
a meaningfull string about ourself No Descriptor class which inherits this class should override this method. Rather print() method which is defined in this class should be overridden to describe itself. Refer to the comments on print() method for more details. This method is optimized for persformance reasons.

        StringBuffer toStringBuf = new StringBuffer();
        this.print(toStringBuf);
        return toStringBuf.toString();