/******************************************************************************
* 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.services.internal;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.eclipse.sapphire.Element;
import org.eclipse.sapphire.Event;
import org.eclipse.sapphire.Listener;
import org.eclipse.sapphire.LoggingService;
import org.eclipse.sapphire.PropertyDef;
import org.eclipse.sapphire.Sapphire;
import org.eclipse.sapphire.ValueProperty;
import org.eclipse.sapphire.modeling.annotations.FileExtensions;
import org.eclipse.sapphire.modeling.el.FailSafeFunction;
import org.eclipse.sapphire.modeling.el.Function;
import org.eclipse.sapphire.modeling.el.FunctionResult;
import org.eclipse.sapphire.modeling.el.Literal;
import org.eclipse.sapphire.modeling.el.ModelElementFunctionContext;
import org.eclipse.sapphire.modeling.el.parser.ExpressionLanguageParser;
import org.eclipse.sapphire.services.FileExtensionsService;
import org.eclipse.sapphire.services.FileExtensionsServiceData;
import org.eclipse.sapphire.services.ServiceCondition;
import org.eclipse.sapphire.services.ServiceContext;
/**
* Implementation of FileExtensionsService that derives its behavior from @FileExtensions annotation.
*
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class DeclarativeFileExtensionsService extends FileExtensionsService
{
private FunctionResult functionResult;
@Override
protected void initFileExtensionsService()
{
final FileExtensions fileExtensionsAnnotation = context( PropertyDef.class ).getAnnotation( FileExtensions.class );
Function function = null;
try
{
function = ExpressionLanguageParser.parse( fileExtensionsAnnotation.expr() );
}
catch( Exception e )
{
Sapphire.service( LoggingService.class ).log( e );
function = null;
}
if( function != null )
{
function = FailSafeFunction.create( function, Literal.create( List.class ), Literal.create( Collections.emptyList() ) );
this.functionResult = function.evaluate( new ModelElementFunctionContext( context( Element.class ) ) );
this.functionResult.attach
(
new Listener()
{
@Override
public void handle( final Event event )
{
refresh();
}
}
);
}
}
@Override
protected FileExtensionsServiceData compute()
{
final List<String> extensions = new ArrayList<String>();
if( this.functionResult != null )
{
for( Object extension : (List<?>) this.functionResult.value() )
{
extensions.add( (String) extension );
}
}
return new FileExtensionsServiceData( extensions );
}
@Override
public void dispose()
{
super.dispose();
if( this.functionResult != null )
{
try
{
this.functionResult.dispose();
}
catch( Exception e )
{
Sapphire.service( LoggingService.class ).log( e );
}
}
}
public static final class Condition extends ServiceCondition
{
@Override
public boolean applicable( final ServiceContext context )
{
final ValueProperty property = context.find( ValueProperty.class );
return property != null && property.hasAnnotation( FileExtensions.class );
}
}
}