/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-04 Wolfgang M. Meier
* wolfgang@exist-db.org
* http://exist.sourceforge.net
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package org.exist.xquery;
import org.exist.dom.QName;
/**
* Used to uniquely identify a function by its function name and arity.
*
* @author wolf
*/
public class FunctionId implements Comparable {
final private QName qname;
final private int argCount;
public FunctionId(QName qname, int arguments) {
this.qname = qname;
this.argCount = arguments;
}
/* (non-Javadoc)
* @see java.lang.Comparable#compareTo(java.lang.Object)
*/
public int compareTo(Object o) {
final FunctionId other = (FunctionId)o;
final int cmp = qname.compareTo(other.qname);
if(cmp == 0) {
if(argCount == other.argCount || argCount == -1 || other.argCount == -1)
return Constants.EQUAL;
else if(argCount < other.argCount)
return Constants.INFERIOR;
else
return Constants.SUPERIOR;
} else
return cmp;
}
public String toString() {
return qname.getStringValue() + "/" + argCount;
}
}