/***************************************************************************
* Copyright (C) by Fabrizio Montesi *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Library General Public License as *
* published by the Free Software Foundation; either version 2 of the *
* License, or (at your option) any later version. *
* *
* 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 General Public License for more details. *
* *
* You should have received a copy of the GNU Library General Public *
* License along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
* *
* For details about the authors of this software, see the AUTHORS file. *
***************************************************************************/
package joliex.util;
import java.math.BigDecimal;
import jolie.runtime.JavaService;
import jolie.runtime.Value;
/**
* JavaService offering various math related functionalities.
* @author Fabrizio Montesi
*/
public class MathService extends JavaService
{
public Double random()
{
return Math.random();
}
public Integer abs( Integer i )
{
return Math.abs( i );
}
public Double pow( Value request )
{
return Math.pow( request.getFirstChild( "base" ).doubleValue(), request.getFirstChild( "exponent" ).doubleValue() );
}
public Integer summation( Value request )
{
int from = request.getFirstChild( "from" ).intValue();
int to = request.getFirstChild( "to" ).intValue();
int result = 0;
while( from <= to ) {
result += from;
from++;
}
return result;
}
/**
* @author Claudio Guidi
* @author Fabrizio Montesi
*/
public Double round( Value v )
{
int decimals = 0;
if ( v.hasChildren( "decimals" ) ) {
decimals = v.getFirstChild( "decimals" ).intValue();
}
double orig = v.doubleValue();
double power = Math.pow( 10, decimals );
double ret = orig * power;
if ( ret == Double.POSITIVE_INFINITY ) {
BigDecimal b = new BigDecimal( orig );
b = b.setScale( decimals, BigDecimal.ROUND_HALF_UP );
ret = b.doubleValue();
} else {
ret = Math.round( ret ) / power;
}
return ret;
}
}