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uk.org.ogsadai.common.properties
Class SelfUpdatingProperty

java.lang.Object
  |
  +--java.util.Observable
        |
        +--uk.org.ogsadai.common.properties.Property
              |
              +--uk.org.ogsadai.common.properties.SelfUpdatingProperty
public class SelfUpdatingProperty
extends Property

A property that updates its value automatically whenever a specified object changes state.

The specified object is Observable The new property value will be the argument passed to the notifyObservers method of the Observable object. This in turn will be passed to the observers of this property.

Author:
The OGSA-DAI Project Team

Field Summary
private static java.lang.String COPYRIGHT_NOTICE
           
private  java.util.Observable mObservable
           
private  java.lang.Object mValue
           
 
Fields inherited from class uk.org.ogsadai.common.properties.Property
mName, mSecurityContext
 
Fields inherited from class java.util.Observable
 
Constructor Summary
SelfUpdatingProperty(javax.xml.namespace.QName name, java.lang.Object initialValue, java.util.Observable observable)
          Create a new property with the specified name and initial value.
 
Method Summary
protected  java.util.Observer createObserver()
          Creates and returns an observer that will automatically notify observers of the property whenever the property value changes state.
 java.lang.Object getValue()
          Return the property value.
 void setValue(java.lang.Object value)
          Set the property value.
 
Methods inherited from class uk.org.ogsadai.common.properties.Property
getName, setName, setSecurityContext
 
Methods inherited from class java.util.Observable
addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

COPYRIGHT_NOTICE

private static final java.lang.String COPYRIGHT_NOTICE
See Also:
Constant Field Values

mValue

private java.lang.Object mValue

mObservable

private final java.util.Observable mObservable
Constructor Detail

SelfUpdatingProperty

public SelfUpdatingProperty(javax.xml.namespace.QName name,
                            java.lang.Object initialValue,
                            java.util.Observable observable)
Create a new property with the specified name and initial value. The value will be updated whenever the specified observable object notifies its observers of a change of state.

Parameters:
name - The name of the property.
initialValue - The initial value for the property.
observable - The observable object that will govern when the property value is updated.
Method Detail

createObserver

protected java.util.Observer createObserver()
Creates and returns an observer that will automatically notify observers of the property whenever the property value changes state.

Returns:
observer.

getValue

public java.lang.Object getValue()
                          throws PropertyValueException
Description copied from class: Property
Return the property value.

Specified by:
getValue in class Property
Returns:
the value for the property or null if it has not been set.
Throws:
PropertyValueException - if an error occurs when obtaining the value.

setValue

public void setValue(java.lang.Object value)
Description copied from class: Property
Set the property value.

Specified by:
setValue in class Property
Parameters:
value - Property value.
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