/******************************************************************************
* 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;
import org.eclipse.sapphire.ValueProperty;
import org.eclipse.sapphire.modeling.annotations.Whitespace;
/**
* Standard implementation of ValueNormalizationService that derives its behavior from
* declarative annotations, such as @Whitespace. Can be extended to add further normalization
* logic to what's provided by the system.
*
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public class StandardValueNormalizationService extends ValueNormalizationService
{
private boolean trim;
private boolean collapse;
@Override
protected void init()
{
super.init();
final Whitespace ws = context( ValueProperty.class ).getAnnotation( Whitespace.class );
if( ws == null )
{
this.trim = true;
this.collapse = false;
}
else
{
this.trim = ws.trim();
this.collapse = ws.collapse();
}
}
@Override
public String normalize( final String str )
{
String text = str;
if( str != null )
{
if( this.trim )
{
text = trim( text );
}
if( this.collapse )
{
text = collapse( text );
}
}
return text;
}
public static final String trim( final String str )
{
return str.trim();
}
public static final String collapse( final String str )
{
String text = str;
final StringBuilder buf = new StringBuilder();
boolean skipNextWhitespace = true;
for( int i = 0, n = text.length(); i < n; i++ )
{
final char ch = text.charAt( i );
if( Character.isWhitespace( ch ) )
{
if( ! skipNextWhitespace )
{
buf.append( ' ' );
skipNextWhitespace = true;
}
}
else
{
buf.append( ch );
skipNextWhitespace = false;
}
}
final int length = buf.length();
if( length > 0 && buf.charAt( length - 1 ) == ' ' )
{
buf.deleteCharAt( length - 1 );
}
return buf.toString();
}
}