/******************************************************************************
* 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.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.Version;
import org.eclipse.sapphire.VersionCompatibilityTarget;
import org.eclipse.sapphire.VersionCompatibilityTargetService;
import org.eclipse.sapphire.modeling.el.FailSafeFunction;
import org.eclipse.sapphire.modeling.el.Function;
import org.eclipse.sapphire.modeling.el.FunctionContext;
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.ServiceCondition;
import org.eclipse.sapphire.services.ServiceContext;
/**
* Implementation of VersionCompatibilityTargetService that derives its behavior from @VersionCompatibilityTarget annotation.
*
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class DeclarativeVersionCompatibilityTargetService extends VersionCompatibilityTargetService
{
private FunctionResult versionFunctionResult;
private FunctionResult versionedFunctionResult;
@Override
protected void initContextVersionService()
{
final Element element = context( Element.class );
final PropertyDef property = context( PropertyDef.class );
final VersionCompatibilityTarget versionCompatibilityTargetAnnotation;
if( property != null )
{
versionCompatibilityTargetAnnotation = property.getAnnotation( VersionCompatibilityTarget.class );
}
else
{
versionCompatibilityTargetAnnotation = element.type().getAnnotation( VersionCompatibilityTarget.class );
}
Function versionFunction = null;
try
{
versionFunction = ExpressionLanguageParser.parse( versionCompatibilityTargetAnnotation.version() );
}
catch( Exception e )
{
Sapphire.service( LoggingService.class ).log( e );
}
if( versionFunction == null )
{
versionFunction = Literal.NULL;
this.versionedFunctionResult = versionFunction.evaluate( new FunctionContext() );
}
else
{
versionFunction = FailSafeFunction.create( versionFunction, Literal.create( Version.class ), null );
this.versionFunctionResult = versionFunction.evaluate( new ModelElementFunctionContext( element ) );
this.versionFunctionResult.attach
(
new Listener()
{
@Override
public void handle( final Event event )
{
refresh();
}
}
);
}
Function versionedFunction = null;
try
{
versionedFunction = ExpressionLanguageParser.parse( versionCompatibilityTargetAnnotation.versioned() );
}
catch( Exception e )
{
Sapphire.service( LoggingService.class ).log( e );
}
if( versionedFunction == null )
{
versionedFunction = Literal.NULL;
this.versionedFunctionResult = versionedFunction.evaluate( new FunctionContext() );
}
else
{
versionedFunction = FailSafeFunction.create( versionedFunction, Literal.create( String.class ), null );
this.versionedFunctionResult = versionedFunction.evaluate( new ModelElementFunctionContext( element ) );
this.versionedFunctionResult.attach
(
new Listener()
{
@Override
public void handle( final Event event )
{
refresh();
}
}
);
}
}
@Override
protected Data compute()
{
return new Data( (Version) this.versionFunctionResult.value(), (String) this.versionedFunctionResult.value() );
}
@Override
public void dispose()
{
super.dispose();
if( this.versionFunctionResult != null )
{
try
{
this.versionFunctionResult.dispose();
}
catch( Exception e )
{
Sapphire.service( LoggingService.class ).log( e );
}
}
if( this.versionFunctionResult != null )
{
try
{
this.versionFunctionResult.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 PropertyDef property = context.find( PropertyDef.class );
if( property != null )
{
return property.hasAnnotation( VersionCompatibilityTarget.class );
}
else
{
final Element element = context.find( Element.class );
return element != null && element.type().hasAnnotation( VersionCompatibilityTarget.class );
}
}
}
}