/*
* 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;
/**
* Computes the minimum of all data-row columns defined in the field-list. This computes the horizontal minimum, to
* compute the minimum value in a group, use the ItemMinFunction instead.
*
* @author Thomas Morgner
* @deprecated Use a formula
*/
public class ColumnMinimumExpression extends ColumnAggregationExpression {
/**
* Default Constructor.
*/
public ColumnMinimumExpression() {
}
/**
* Returns the minimum value. Non-comparable values are ignored.
*
* @return the minimum value computed by the function.
*/
public Object getValue() {
final Object[] values = getFieldValues();
Comparable computedResult = null;
for ( int i = 0; i < values.length; i++ ) {
final Object value = values[i];
if ( value instanceof Comparable == false ) {
continue;
}
final Comparable n = (Comparable) value;
if ( computedResult == null ) {
computedResult = n;
} else if ( computedResult.compareTo( n ) < 0 ) {
computedResult = n;
}
}
return computedResult;
}
}