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Eclipse Platform
Release 3.5

org.eclipse.core.databinding
Class AggregateValidationStatus

java.lang.Object
  extended by 

org.eclipse.core.databinding.observable.AbstractObservable
      extended by 

org.eclipse.core.databinding.observable.value.AbstractObservableValue
          extended by 

org.eclipse.core.databinding.observable.value.ComputedValue
              extended by 
org.eclipse.core.databinding.AggregateValidationStatus
All Implemented Interfaces:
IObservable, IObservableValue

public final class AggregateValidationStatus
extends ComputedValue

This class can be used to aggregate status values from a data binding context into a single status value. Instances of this class can be used as an observable value with a value type of IStatus, or the static methods can be called directly if an aggregated status result is only needed once.

Since:
1.0

Field Summary
static int MAX_SEVERITY
          Constant denoting an aggregation strategy that always returns the most severe status from the given validation status providers.
static int MERGED
          Constant denoting an aggregation strategy that merges multiple non-OK status objects in a MultiStatus.
 
Constructor Summary
AggregateValidationStatus ( DataBindingContext dbc, int strategy)
          Creates a new aggregate validation status observable for the given data binding context.
AggregateValidationStatus ( IObservableCollection validationStatusProviders, int strategy)
           
AggregateValidationStatus ( Realm realm, IObservableCollection validationStatusProviders, int strategy)
           
 
Method Summary
protected  void addListener ( Object listenerType, IObservablesListener listener)
           
protected   Object calculate ()
          Subclasses must override this method to provide the object's value.
protected   Object clone ()
           
protected  void fireEvent ( ObservableEvent event)
           
protected  void firstListenerAdded ()
           
  Realm getRealm ()
           
static  IStatus getStatusMaxSeverity ( Collection validationStatusProviders)
          Returns a status that always returns the most severe status from the given validation status providers.
static  IStatus getStatusMerged ( Collection validationStatusProviders)
          Returns a status object that merges multiple non-OK status objects in a MultiStatus.
protected  void lastListenerRemoved ()
           
protected  void removeListener ( Object listenerType, IObservablesListener listener)
           
 
Methods inherited from class org.eclipse.core.databinding.observable.value. ComputedValue
addChangeListener, addValueChangeListener, dispose, doGetValue, getValueType, hasListeners, isStale, makeDirty
 
Methods inherited from class org.eclipse.core.databinding.observable.value. AbstractObservableValue
doSetValue, fireChange, fireValueChange, getValue, removeValueChangeListener, setValue
 
Methods inherited from class org.eclipse.core.databinding.observable. AbstractObservable
addDisposeListener, addStaleListener, checkRealm, fireStale, isDisposed, removeChangeListener, removeDisposeListener, removeStaleListener
 
Methods inherited from class java.lang. Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.eclipse.core.databinding.observable. IObservable
addDisposeListener, addStaleListener, getRealm, isDisposed, removeChangeListener, removeDisposeListener, removeStaleListener
 

Field Detail

MERGED

public static final int MERGED
Constant denoting an aggregation strategy that merges multiple non-OK status objects in a MultiStatus. Returns an OK status result if all statuses from the given validation status providers are the an OK status. Returns a single status if there is only one non-OK status.

See Also:
getStatusMerged(Collection), Constant Field Values

MAX_SEVERITY

public static final int MAX_SEVERITY
Constant denoting an aggregation strategy that always returns the most severe status from the given validation status providers. If there is more than one status at the same severity level, it picks the first one it encounters.

See Also:
getStatusMaxSeverity(Collection), Constant Field Values
Constructor Detail

AggregateValidationStatus

public AggregateValidationStatus(
DataBindingContext dbc,
                                 int strategy)
Creates a new aggregate validation status observable for the given data binding context.

Parameters:
dbc - a data binding context
strategy - a strategy constant, one of MERGED or MAX_SEVERITY.
Since:
1.1

AggregateValidationStatus

public AggregateValidationStatus(
IObservableCollection validationStatusProviders,
                                 int strategy)
Parameters:
validationStatusProviders - an observable collection containing elements of type ValidationStatusProvider
strategy - a strategy constant, one of MERGED or MAX_SEVERITY.
See Also:
DataBindingContext.getValidationStatusProviders()

AggregateValidationStatus

public AggregateValidationStatus(
Realm realm,
                                 
IObservableCollection validationStatusProviders,
                                 int strategy)
Parameters:
realm - Realm
validationStatusProviders - an observable collection containing elements of type ValidationStatusProvider
strategy - a strategy constant, one of MERGED or MAX_SEVERITY.
Since:
1.1
See Also:
DataBindingContext.getValidationStatusProviders()
Method Detail

calculate

protected 
Object calculate()
Description copied from class: ComputedValue
Subclasses must override this method to provide the object's value. Any dependencies used to calculate the value must be IObservable, and implementers must use one of the interface methods tagged TrackedGetter for ComputedValue to recognize it as a dependency.

Specified by:
calculate in class ComputedValue
Returns:
the object's value

getStatusMerged

public static 
IStatus getStatusMerged(
Collection validationStatusProviders)
Returns a status object that merges multiple non-OK status objects in a MultiStatus. Returns an OK status result if all statuses from the given validation status providers are the an OK status. Returns a single status if there is only one non-OK status.

Parameters:
validationStatusProviders - a collection of validation status providers
Returns:
a merged status

getStatusMaxSeverity

public static 
IStatus getStatusMaxSeverity(
Collection validationStatusProviders)
Returns a status that always returns the most severe status from the given validation status providers. If there is more than one status at the same severity level, it picks the first one it encounters.

Parameters:
validationStatusProviders - a collection of validation status providers
Returns:
a single status reflecting the most severe status from the given validation status providers

addListener

protected void addListener(
Object listenerType,
                           
IObservablesListener listener)
Parameters:
listenerType -
listener -

removeListener

protected void removeListener(
Object listenerType,
                              
IObservablesListener listener)
Parameters:
listenerType -
listener -

fireEvent

protected void fireEvent(
ObservableEvent event)

firstListenerAdded

protected void firstListenerAdded()

lastListenerRemoved

protected void lastListenerRemoved()

getRealm

public 
Realm getRealm()
Returns:
Returns the realm.

clone

protected 
Object clone()
                throws 
CloneNotSupportedException
Overrides:
clone in class Object
Throws:
CloneNotSupportedException

Eclipse Platform
Release 3.5

Guidelines for using Eclipse APIs.

Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.


 
 
  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire