/******************************************************************************
* 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;
import java.util.List;
import org.eclipse.sapphire.VersionCompatibilityService.Data;
import org.eclipse.sapphire.services.DataService;
/**
* Aggregates the data from all applicable version compatibility services in order to produce a single statement
* about version compatibility.
*
* <p>An implementation of this service is provided with Sapphire. This service is not intended to
* be implemented by adopters.</p>
*
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class MasterVersionCompatibilityService extends DataService<Data>
{
private List<VersionCompatibilityService> services;
private Listener listener;
@Override
protected final void initDataService()
{
this.services = context( Property.class ).services( VersionCompatibilityService.class );
this.listener = new Listener()
{
@Override
public void handle( final Event event )
{
refresh();
}
};
for( VersionCompatibilityService service : this.services )
{
service.attach( this.listener );
}
}
public final boolean compatible()
{
final Data data = data();
return ( data == null ? true : data.compatible() );
}
public final Version version()
{
final Data data = data();
return ( data == null ? null : data.version() );
}
public final String versioned()
{
final Data data = data();
return ( data == null ? null : data.versioned() );
}
@Override
protected Data compute()
{
VersionCompatibilityService.Data data = null;
for( VersionCompatibilityService service : this.services )
{
data = service.data();
if( service.compatible() == false )
{
break;
}
}
return data;
}
@Override
public void dispose()
{
super.dispose();
if( this.listener != null )
{
for( VersionCompatibilityService service : this.services )
{
service.detach( this.listener );
}
}
}
}