/*
* 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) 2001 - 2013 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.function;
/**
* Checks whether a field is empty. A field is considered empty, if it contains the value 'null', or an string that is
* empty or only consists of whitespaces or a number that evaluates to zero.
*
* @author Thomas Morgner
* @deprecated Use a Formula Instead
*/
public class IsEmptyExpression extends AbstractExpression {
/**
* The field name.
*/
private String field;
/**
* Default constructor.
*/
public IsEmptyExpression() {
}
/**
* Returns the name of the field from where to read the value.
*
* @return the field.
*/
public String getField() {
return field;
}
/**
* Defines the name of the field from where to read the value.
*
* @param field
* the field.
*/
public void setField( final String field ) {
this.field = field;
}
/**
* Return the current expression value.
* <P>
* The value depends (obviously) on the expression implementation.
*
* @return the value of the function.
*/
public Object getValue() {
final Object o = getDataRow().get( getField() );
if ( o == null ) {
return Boolean.TRUE;
}
if ( o instanceof String ) {
final String s = (String) o;
if ( s.trim().length() == 0 ) {
return Boolean.TRUE;
}
return Boolean.FALSE;
}
if ( o instanceof Number ) {
final Number n = (Number) o;
if ( n.doubleValue() == 0 ) {
return Boolean.TRUE;
}
return Boolean.FALSE;
}
return Boolean.FALSE;
}
}