/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2006 - 2013 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.formula.function.information;
import org.pentaho.reporting.libraries.formula.EvaluationException;
import org.pentaho.reporting.libraries.formula.FormulaContext;
import org.pentaho.reporting.libraries.formula.function.Function;
import org.pentaho.reporting.libraries.formula.function.ParameterCallback;
import org.pentaho.reporting.libraries.formula.lvalues.TypeValuePair;
import org.pentaho.reporting.libraries.formula.typing.coretypes.LogicalType;
/**
* Creation-Date: 24.11.2006, 13:02:41
*
* @author Thomas Morgner
*/
public class HasChangedFunction implements Function {
private static final TypeValuePair RETURN_FALSE = new TypeValuePair( LogicalType.TYPE, Boolean.FALSE );
private static final TypeValuePair RETURN_TRUE = new TypeValuePair( LogicalType.TYPE, Boolean.TRUE );
private static final long serialVersionUID = 5952911264465883971L;
public HasChangedFunction() {
}
public String getCanonicalName() {
return "HASCHANGED";
}
public TypeValuePair evaluate( final FormulaContext context,
final ParameterCallback parameters )
throws EvaluationException {
// we expect strings and will check, whether the reference for theses
// strings is dirty.
final int parCount = parameters.getParameterCount();
for ( int i = 0; i < parCount; i++ ) {
final Object value = parameters.getValue( i );
if ( value == null ) {
continue;
}
if ( context.isReferenceDirty( value ) ) {
return RETURN_TRUE;
}
}
return RETURN_FALSE;
}
}