Package org.eclipse.core.databinding

Class AggregateValidationStatus

java.lang.Object

org.eclipse.core.databinding.observable.AbstractObservable

org.eclipse.core.databinding.observable.value.AbstractObservableValue<T>

org.eclipse.core.databinding.observable.value.ComputedValue<IStatus>

org.eclipse.core.databinding.AggregateValidationStatus

All Implemented Interfaces:

IObservable, IObservableValue<IStatus>

public final class AggregateValidationStatus
extends ComputedValue<IStatus>

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

Fields

Modifier and Type	Field	Description
static final int	MAX_SEVERITY	Constant denoting an aggregation strategy that always returns the most severe status from the given validation status providers.
static final int	MERGED	Constant denoting an aggregation strategy that merges multiple non-OK status objects in a MultiStatus.

Constructor Summary

Constructors

Constructor	Description
AggregateValidationStatus(DataBindingContext dbc, int strategy)	Creates a new aggregate validation status observable for the given data binding context.
AggregateValidationStatus(IObservableCollection<? extends ValidationStatusProvider> validationStatusProviders, int strategy)
AggregateValidationStatus(Realm realm, IObservableCollection<? extends ValidationStatusProvider> validationStatusProviders, int strategy)

Method Summary

Modifier and Type	Method	Description
protected void	addListener(Object listenerType, IObservablesListener listener)
protected IStatus	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<? extends ValidationStatusProvider> validationStatusProviders)	Returns a status that always returns the most severe status from the given validation status providers.
static IStatus	getStatusMerged(Collection<? extends ValidationStatusProvider> 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, create, 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 Details

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 Details

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<? extends ValidationStatusProvider> 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<? extends ValidationStatusProvider> 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 Details

calculate

protected IStatus 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<IStatus>

Returns:

the object's value

getStatusMerged

public static IStatus getStatusMerged(Collection<? extends ValidationStatusProvider> 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<? extends ValidationStatusProvider> 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 - arbitrary object to identify a type of the listener

listener - the listener to add; not null

removeListener

protected void removeListener(Object listenerType,
 IObservablesListener listener)

Parameters:

listenerType - arbitrary object to identify a type of the listener

listener - the listener to remove; not null

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