/*
* Copyright (C) 2000 - 2008 TagServlet Ltd
*
* This file is part of Open BlueDragon (OpenBD) CFML Server Engine.
*
* OpenBD is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* Free Software Foundation,version 3.
*
* OpenBD 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 General Public License
* along with OpenBD. If not, see http://www.gnu.org/licenses/
*
* Additional permission under GNU GPL version 3 section 7
*
* If you modify this Program, or any covered work, by linking or combining
* it with any of the JARS listed in the README.txt (or a modified version of
* (that library), containing parts covered by the terms of that JAR, the
* licensors of this Program grant you additional permission to convey the
* resulting work.
* README.txt @ http://www.openbluedragon.org/license/README.txt
*
* http://www.openbluedragon.org/
*/
package com.naryx.tagfusion.expression.function.bit;
import java.util.List;
import com.naryx.tagfusion.cfm.engine.cfData;
import com.naryx.tagfusion.cfm.engine.cfNumberData;
import com.naryx.tagfusion.cfm.engine.cfSession;
import com.naryx.tagfusion.cfm.engine.cfmRunTimeException;
import com.naryx.tagfusion.expression.function.functionBase;
public class bitMaskSet extends functionBase {
private static final long serialVersionUID = 1L;
public bitMaskSet(){ min = max = 4; }
public String[] getParamInfo(){
return new String[]{
"number",
"mask",
"bit number to start",
"length of bits"
};
}
public java.util.Map getInfo(){
return makeInfo(
"math",
"Set a mask on the given number covering the range given",
ReturnType.NUMERIC );
}
public cfData execute( cfSession _session, List<cfData> parameters ) throws cfmRunTimeException{
int number = getInt( _session, parameters.get(3) );
int mask = getInt( _session, parameters.get(2) );
int start = getInt( _session, parameters.get(1) );
int length = getInt( _session, parameters.get(0) );
//--[ Check some bounds
if ( start < 0 || start > 31 || length < 0 || length > 31 )
throwException( _session, "Parameters start and length must be in the range 0 - 31" );
//--[ Create the mask
int maskMask = 0;
for (int x=0; x < length; x++ )
maskMask = maskMask | ( 1 << x );
maskMask = mask & maskMask;
return new cfNumberData( number | (maskMask << start) );
}
}