/******************************************************************************
* 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.tests.modeling.el.functions.head;
import org.eclipse.sapphire.modeling.el.FunctionContext;
import org.eclipse.sapphire.modeling.el.FunctionResult;
import org.eclipse.sapphire.modeling.el.ModelElementFunctionContext;
import org.eclipse.sapphire.modeling.el.parser.ExpressionLanguageParser;
import org.eclipse.sapphire.tests.modeling.el.TestExpr;
import org.junit.Test;
/**
* Tests Head function.
*
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class HeadFunctionTests extends TestExpr
{
@Test
public void testHeadFunction()
{
final TestElement element = TestElement.TYPE.instantiate();
final FunctionContext context = new ModelElementFunctionContext( element );
FunctionResult fr = ExpressionLanguageParser.parse( "${ Value.Head( 3 ) }" ).evaluate( context );
try
{
assertEquals( "", fr.value() );
element.setValue( "ab" );
assertEquals( "ab", fr.value() );
element.setValue( "abcdefg" );
assertEquals( "abc", fr.value() );
}
finally
{
fr.dispose();
}
fr = ExpressionLanguageParser.parse( "${ Value.Head( 0 ) }" ).evaluate( context );
try
{
element.setValue( null );
assertEquals( "", fr.value() );
element.setValue( "ab" );
assertEquals( "", fr.value() );
element.setValue( "abcdefg" );
assertEquals( "", fr.value() );
}
finally
{
fr.dispose();
}
fr = ExpressionLanguageParser.parse( "${ Value.Head( -3 ) }" ).evaluate( context );
try
{
element.setValue( null );
assertEquals( "", fr.value() );
element.setValue( "ab" );
assertEquals( "", fr.value() );
element.setValue( "abcdefg" );
assertEquals( "", fr.value() );
}
finally
{
fr.dispose();
}
}
}