/******************************************************************************
* 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.Since;
import org.eclipse.sapphire.Version;
import org.eclipse.sapphire.VersionCompatibility;
import org.eclipse.sapphire.VersionCompatibilityService;
import org.eclipse.sapphire.VersionCompatibilityTargetService;
import org.eclipse.sapphire.VersionConstraint;
import org.eclipse.sapphire.modeling.el.ConcatFunction;
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.modeling.util.MiscUtil;
import org.eclipse.sapphire.services.ServiceCondition;
import org.eclipse.sapphire.services.ServiceContext;
/**
* Implementation of VersionCompatibilityService that derives its behavior from @VersionCompatibility and @Since annotations.
*
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class DeclarativeVersionCompatibilityService extends VersionCompatibilityService
{
private VersionCompatibilityTargetService versionCompatibilityTargetService;
private Listener versionCompatibilityTargetServiceListener;
private FunctionResult functionResult;
@Override
protected void initVersionCompatibilityService()
{
final Element element = context( Element.class );
final PropertyDef property = context( PropertyDef.class );
this.versionCompatibilityTargetService = VersionCompatibilityTargetService.find( element, property );
this.versionCompatibilityTargetServiceListener = new Listener()
{
@Override
public void handle( final Event event )
{
refresh();
}
};
this.versionCompatibilityTargetService.attach( this.versionCompatibilityTargetServiceListener );
Function function = null;
final VersionCompatibility versionCompatibilityAnnotation = property.getAnnotation( VersionCompatibility.class );
if( versionCompatibilityAnnotation != null )
{
try
{
function = ExpressionLanguageParser.parse( versionCompatibilityAnnotation.value() );
}
catch( Exception e )
{
Sapphire.service( LoggingService.class ).log( e );
}
}
else
{
final Since sinceAnnotation = property.getAnnotation( Since.class );
try
{
function = ExpressionLanguageParser.parse( sinceAnnotation.value() );
}
catch( Exception e )
{
Sapphire.service( LoggingService.class ).log( e );
}
if( function != null )
{
function = ConcatFunction.create( "[", function );
}
}
if( function == null )
{
function = Literal.NULL;
}
else
{
function = FailSafeFunction.create( function, Literal.create( VersionConstraint.class ), null );
this.functionResult = function.evaluate( new ModelElementFunctionContext( element ) );
this.functionResult.attach
(
new Listener()
{
@Override
public void handle( final Event event )
{
refresh();
}
}
);
}
}
@Override
protected Data compute()
{
final Version version = this.versionCompatibilityTargetService.version();
final String versioned = this.versionCompatibilityTargetService.versioned();
boolean compatible = false;
final VersionConstraint constraint = (VersionConstraint) this.functionResult.value();
if( constraint != null && version != null )
{
compatible = constraint.check( version );
}
return new Data( versioned, version, constraint, compatible );
}
public VersionConstraint constraint()
{
final Data data = (Data) data();
return ( data == null ? null : data.constraint() );
}
@Override
public void dispose()
{
super.dispose();
if( this.versionCompatibilityTargetService != null )
{
this.versionCompatibilityTargetService.detach( this.versionCompatibilityTargetServiceListener );
}
if( this.functionResult != null )
{
try
{
this.functionResult.dispose();
}
catch( Exception e )
{
Sapphire.service( LoggingService.class ).log( e );
}
}
}
public static final class Data extends VersionCompatibilityService.Data
{
private final VersionConstraint constraint;
public Data( final String versioned,
final Version version,
final VersionConstraint constraint,
final boolean compatible )
{
super( compatible, version, versioned );
this.constraint = constraint;
}
public VersionConstraint constraint()
{
return this.constraint;
}
@Override
public boolean equals( final Object obj )
{
if( obj instanceof Data )
{
final Data data = (Data) obj;
return super.equals( obj ) && MiscUtil.equal( this.constraint, data.constraint );
}
return false;
}
@Override
public int hashCode()
{
return super.hashCode() + ( this.constraint == null ? 0 : this.constraint.hashCode() );
}
}
public static final class Condition extends ServiceCondition
{
@Override
public boolean applicable( final ServiceContext context )
{
final Element element = context.find( Element.class );
final PropertyDef property = context.find( PropertyDef.class );
return ( property.hasAnnotation( VersionCompatibility.class ) || property.hasAnnotation( Since.class ) ) &&
( VersionCompatibilityTargetService.find( element, property ) != null );
}
}
}