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package org.nakedobjects.applib.events;

import org.nakedobjects.applib.Identifier;


/**
 * Represents a check to determine whether a proposed change is valid.
 * 
 * 
 * Multiple subclasses, including:
 * 

 * modifying a property
 * adding to/removing from a collection
 * checking a single argument for an action invocation
 * checking all arguments for an action invocation
 * checking all properties for an object before saving
 * 
 * 
 * 
 * If {@link #getReason()} is null, then is usable; otherwise is disabled.
 * 
 * @see AccessEvent
 * @see VisibilityEvent
 * @see UsabilityEvent
 */
public abstract class ValidityEvent extends InteractionEvent {

    private static final long serialVersionUID = 1L;

    public ValidityEvent(final Object source, final Identifier identifier) {
        super(source, identifier);
    }

    @Override
    public Object getSource() {
    	return super.getSource();
    }
}