/******************************************************************************
* Copyright (c) 2014 Oracle
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Konstantin Komissarchik - initial implementation and ongoing maintenance
******************************************************************************/
package org.eclipse.sapphire.internal;
import org.eclipse.sapphire.EnablementService;
import org.eclipse.sapphire.Event;
import org.eclipse.sapphire.FilteredListener;
import org.eclipse.sapphire.ImpliedElementProperty;
import org.eclipse.sapphire.Listener;
import org.eclipse.sapphire.MasterVersionCompatibilityService;
import org.eclipse.sapphire.Property;
import org.eclipse.sapphire.PropertyContentEvent;
/**
* Implementation of EnablementService that determines property's enablement state based on property's
* compatibility with the version compatibility target.
*
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class VersionCompatibilityEnablementService extends EnablementService
{
private MasterVersionCompatibilityService versionCompatibilityService;
private Listener versionCompatibilityServiceListener;
private Listener propertyListener;
@Override
protected void initEnablementService()
{
final Property property = context( Property.class );
this.versionCompatibilityService = property.service( MasterVersionCompatibilityService.class );
this.versionCompatibilityServiceListener = new Listener()
{
@Override
public void handle( final Event event )
{
refresh();
}
};
this.versionCompatibilityService.attach( this.versionCompatibilityServiceListener );
this.propertyListener = new FilteredListener<PropertyContentEvent>()
{
@Override
protected void handleTypedEvent( final PropertyContentEvent event )
{
refresh();
}
};
if( property.definition() instanceof ImpliedElementProperty )
{
property.element().attach( this.propertyListener, property.name() + "/*" );
}
else
{
property.element().attach( this.propertyListener, property.name() );
}
}
@Override
protected Boolean compute()
{
return this.versionCompatibilityService.compatible() || ! context( Property.class ).empty();
}
@Override
public void dispose()
{
super.dispose();
final Property property = context( Property.class );
this.versionCompatibilityService.detach( this.versionCompatibilityServiceListener );
if( property.definition() instanceof ImpliedElementProperty )
{
property.element().detach( this.propertyListener, property.name() + "/*" );
}
else
{
property.element().detach( this.propertyListener, property.name() );
}
}
}