/******************************************************************************
* 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 org.eclipse.sapphire.Collation;
import org.eclipse.sapphire.CollationService;
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.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;
/**
* A {@link CollationService} implementation that derives its behavior from @{@link Collation} annotation.
*
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class DeclarativeCollationService extends CollationService
{
private static final Comparator<String> IGNORE_CASE_COMPARATOR = new Comparator<String>()
{
public int compare( final String str1, final String str2 )
{
return str1.compareToIgnoreCase( str2 );
}
};
private FunctionResult ignoreCaseDifferencesFunctionResult;
@Override
protected void initCollationService()
{
final Collation annotation = context( PropertyDef.class ).getAnnotation( Collation.class );
Function ignoreCaseDifferencesFunction;
try
{
ignoreCaseDifferencesFunction = ExpressionLanguageParser.parse( annotation.ignoreCaseDifferences() );
ignoreCaseDifferencesFunction = FailSafeFunction.create( ignoreCaseDifferencesFunction, Boolean.class, false );
}
catch( Exception e )
{
Sapphire.service( LoggingService.class ).log( e );
ignoreCaseDifferencesFunction = Literal.FALSE;
}
final Element element = context( Element.class );
final FunctionContext context = ( element == null ? new FunctionContext() : new ModelElementFunctionContext( element ) );
this.ignoreCaseDifferencesFunctionResult = ignoreCaseDifferencesFunction.evaluate( context );
this.ignoreCaseDifferencesFunctionResult.attach
(
new Listener()
{
@Override
public void handle( final Event event )
{
refresh();
}
}
);
}
@Override
protected Comparator<String> compute()
{
if( ( (Boolean) this.ignoreCaseDifferencesFunctionResult.value() ) == true )
{
return IGNORE_CASE_COMPARATOR;
}
else
{
return DefaultCollationService.COMPARATOR;
}
}
public static final class GlobalCondition extends ServiceCondition
{
@Override
public boolean applicable( final ServiceContext context )
{
final ValueProperty property = context.find( ValueProperty.class );
if( property != null )
{
final Collation collation = property.getAnnotation( Collation.class );
if( collation != null )
{
return collation.global() ||
collation.ignoreCaseDifferences().equalsIgnoreCase( "true" ) ||
collation.ignoreCaseDifferences().equalsIgnoreCase( "false" );
}
}
return false;
}
}
public static final class InstanceCondition extends ServiceCondition
{
@Override
public boolean applicable( final ServiceContext context )
{
final ValueProperty property = context.find( ValueProperty.class );
if( property != null )
{
final Collation collation = property.getAnnotation( Collation.class );
if( collation != null )
{
return ! collation.global() &&
! collation.ignoreCaseDifferences().equalsIgnoreCase( "true" ) &&
! collation.ignoreCaseDifferences().equalsIgnoreCase( "false" );
}
}
return false;
}
}
}