Java Doc for PropertyValue.java in  » GIS » udig-1.1 » net » refractions » udig » ui » operations » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » udig 1.1 » net.refractions.udig.ui.operations 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


net.refractions.udig.ui.operations.PropertyValue

All known Subclasses:   net.refractions.udig.project.ui.properties.OpenMap,  net.refractions.udig.tool.edit.CurrentShapeTypePropertyValue,
PropertyValue
public interface PropertyValue (Code)
Determines whether a property value is true or false given an object.

This class is must be implemented by objectProperty extensions to teach the system new properties for objects.


author:
   jones
since:
   1.1.0




Method Summary
 voidaddListener(IOpFilterListener listener)
     Adds a listener to listen for events indicating the value has changed.
 booleancanCacheResult()
     Returns true if the results can be cached.
 booleanisBlocking()
     Returns true if processing this filter may block when PropertyValue.accept(Object) is called.
 booleanisTrue(T object, String value)
     Returns true if the value provided is a legal value for the object.
 voidremoveListener(IOpFilterListener listener)
    



Method Detail
addListener
void addListener(IOpFilterListener listener)(Code)
Adds a listener to listen for events indicating the value has changed.
Parameters:
  listener - listener to add



canCacheResult
boolean canCacheResult()(Code)
Returns true if the results can be cached. A result can be cached if
  1. The value will never change
  2. It is possible for the filter to listen for changes and update listeners added via the PropertyValue.addListener(IOpFilterListener) method
Therefore this method only returns false if it must be calculated each time because there is no way to listen for state changes. If it is non-blocking that is fine, if it is blocking then try to do this rarely. true if the results can be cached.



isBlocking
boolean isBlocking()(Code)
Returns true if processing this filter may block when PropertyValue.accept(Object) is called. true if processing this filter may block when PropertyValue.accept(Object) is called.



isTrue
boolean isTrue(T object, String value)(Code)
Returns true if the value provided is a legal value for the object. The subclass determines what are legal values.
Parameters:
  object - the object that will be used to determine if the value is legal
Parameters:
  value - an arbitrary string. Returns true if the value provided is a legal value for the object.



removeListener
void removeListener(IOpFilterListener listener)(Code)
Removes a listeners
Parameters:
  listener - listener to remove



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