/*
* xtc - The eXTensible Compiler
* Copyright (C) 2004 Robert Grimm
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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 General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
package xtc.tree;
/**
* The superclass of all utilities. A utility provides state and
* functionality for visitors. Utilities are implemented as separate
* classes (instead of visitors inheriting from utilities) so that the
* same utility can be reused across visitors and also shared amongst
* several, composed visitors.
*
* @author Robert Grimm
* @version $Revision: 1.5 $
*/
public abstract class Utility {
/** The visitor for this utility. */
Visitor visitor;
/** Create a new utility. */
public Utility() { /* Nothing to do. */ }
/**
* Set the visitor for this utility.
*
* @param visitor The new visitor.
*/
public void register(Visitor visitor) {
this.visitor = visitor;
}
/**
* Get the visitor for this utility.
*
* @return The visitor.
*/
public Visitor visitor() {
return visitor;
}
}