net.refractions.udig.ui.operations
Class Or

java.lang.Object
  net.refractions.udig.ui.operations.Or

All Implemented Interfaces:

OpFilter

public class Or
extends java.lang.Object
implements OpFilter

Represents the Or element in the operation extension point.

Since:

1.1.0

Author:

jones

Field Summary

Fields inherited from interface net.refractions.udig.ui.operations.OpFilter

FALSE, TRUE

Constructor Summary

Or()

Method Summary

boolean	accept(java.lang.Object object) Returns true if the object is accepted by the filter
void	addListener(IOpFilterListener listener) Adds a listener to listen for events indicating the value has changed.
boolean	canCacheResult() Returns true if the results can be cached.
java.util.List<OpFilter>	getFilters()
boolean	isBlocking() Returns true if processing this filter may block when OpFilter.accept(Object) is called or takes a large amount of time to execute.
void	removeListener(IOpFilterListener listener) Removes a listeners

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Or

public Or()

Method Detail

getFilters

public java.util.List<OpFilter> getFilters()

Returns:

Returns the filters.

accept

public boolean accept(java.lang.Object object)

Description copied from interface: OpFilter

Returns true if the object is accepted by the filter

Specified by:

accept in interface OpFilter

Parameters:

object - object to test

Returns:

true if the object is accepted by the filter

addListener

public void addListener(IOpFilterListener listener)

Description copied from interface: OpFilter

Adds a listener to listen for events indicating the value has changed. Listeners should only be added if OpFilter.canCacheResult() returns true.

Specified by:

addListener in interface OpFilter

Parameters:

listener - listener to add

canCacheResult

public boolean canCacheResult()

Description copied from interface: OpFilter

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 OpFilter.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.

WARNING: If this returns true then the listeners must be notified for the new value to be recognized

Specified by:

canCacheResult in interface OpFilter

Returns:

true if the results can be cached.

isBlocking

public boolean isBlocking()

Description copied from interface: OpFilter

Returns true if processing this filter may block when OpFilter.accept(Object) is called or takes a large amount of time to execute.

Specified by:

isBlocking in interface OpFilter

Returns:

true if processing this filter may block when OpFilter.accept(Object) is called.

removeListener

public void removeListener(IOpFilterListener listener)

Description copied from interface: OpFilter

Removes a listeners

Specified by:

removeListener in interface OpFilter

Parameters:

listener - listener to remove