/******************************************************************************
* 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:
* Shenxue Zhou - initial implementation and ongoing maintenance
* Konstantin Komissarchik - initial implementation and ongoing maintenance
******************************************************************************/
package org.eclipse.sapphire.samples.sqlschema.internal;
import org.eclipse.sapphire.DerivedValueService;
import org.eclipse.sapphire.FilteredListener;
import org.eclipse.sapphire.Listener;
import org.eclipse.sapphire.PropertyContentEvent;
import org.eclipse.sapphire.samples.sqlschema.Column;
import org.eclipse.sapphire.samples.sqlschema.ForeignKey;
import org.eclipse.sapphire.samples.sqlschema.Table;
/**
* @author <a href="mailto:shenxue.zhou@oracle.com">Shenxue Zhou</a>
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class PartOfForeignKeyDerivedValueService extends DerivedValueService
{
private Listener listener;
protected void initDerivedValueService()
{
this.listener = new FilteredListener<PropertyContentEvent>()
{
@Override
protected void handleTypedEvent( final PropertyContentEvent event )
{
refresh();
}
};
context( Table.class ).attach( this.listener, "ForeignKeys/ColumnAssociations/LocalColumn" );
}
@Override
protected String compute()
{
final Column column = context( Column.class );
final Table table = column.nearest( Table.class );
for( final ForeignKey fk : table.getForeignKeys() )
{
for( final ForeignKey.ColumnAssociation fkcol : fk.getColumnAssociations() )
{
final String name = fkcol.getLocalColumn().content();
if( name != null && name.equals( column.getName().content() ) )
{
return Boolean.TRUE.toString();
}
}
}
return Boolean.FALSE.toString();
}
@Override
public void dispose()
{
context( Table.class ).detach( this.listener, "ForeignKeys/ColumnAssociations/LocalColumn" );
super.dispose();
}
}