/******************************************************************************
* 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 java.util.Comparator;
import java.util.SortedSet;
import org.eclipse.sapphire.CollationService;
import org.eclipse.sapphire.ElementType;
import org.eclipse.sapphire.Event;
import org.eclipse.sapphire.ListProperty;
import org.eclipse.sapphire.Listener;
import org.eclipse.sapphire.Property;
import org.eclipse.sapphire.PropertyDef;
import org.eclipse.sapphire.ValueProperty;
import org.eclipse.sapphire.services.PossibleTypesService;
import org.eclipse.sapphire.services.ServiceCondition;
import org.eclipse.sapphire.services.ServiceContext;
/**
* Implementation of CollationService for list properties based on CollationService implementation
* of list member's value property. This service implementation will only activate if the list property has
* one possible type, and that type has a single property, and that property is a value property.
*
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class ListFromValueCollationService extends CollationService
{
private CollationService base;
private Listener listener;
private boolean refreshing;
@Override
protected void initCollationService()
{
final ListProperty listProperty = context( ListProperty.class );
final ValueProperty listMemberValueProperty = (ValueProperty) listProperty.getType().properties().first();
this.base = listMemberValueProperty.service( CollationService.class );
this.listener = new Listener()
{
@Override
public void handle( final Event event )
{
if( ! ListFromValueCollationService.this.refreshing )
{
try
{
ListFromValueCollationService.this.refreshing = true;
refresh();
}
finally
{
ListFromValueCollationService.this.refreshing = false;
}
}
}
};
this.base.attach( this.listener );
}
@Override
protected Comparator<String> compute()
{
return this.base.comparator();
}
@Override
public void dispose()
{
super.dispose();
if( this.listener != null )
{
this.base.detach( this.listener );
this.listener = null;
}
this.base = null;
}
public static final class Condition extends ServiceCondition
{
@Override
public boolean applicable( final ServiceContext context )
{
final Property property = context.find( Property.class );
if( property != null && property.definition() instanceof ListProperty &&
property.service( PossibleTypesService.class ).types().size() == 1 )
{
final ElementType memberType = property.definition().getType();
final SortedSet<PropertyDef> properties = memberType.properties();
if( properties.size() == 1 )
{
final PropertyDef memberProperty = properties.first();
return ( memberProperty instanceof ValueProperty );
}
}
return false;
}
}
}