package it.unimi.dsi.mg4j.query.nodes;/*		  * MG4J: Managing Gigabytes for Java * * Copyright (C) 2006-2007 Sebastiano Vigna  * *  This library 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 2.1 of the License, or (at your option) *  any later version. * *  This library 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * *//** A {@link it.unimi.dsi.mg4j.query.nodes.QueryBuilderVisitor} that * returns true on all <code>visitPre()</code> methods and does nothing * on {@link #prepare()}. *  * @author Sebastiano Vigna */public abstract class AbstractQueryBuilderVisitor<T> implements QueryBuilderVisitor<T> {	/** No-op. */	public QueryBuilderVisitor<T> prepare() { return this; }	public boolean visitPre( And node ) throws QueryBuilderVisitorException { return true; }	public boolean visitPre( Consecutive node ) throws QueryBuilderVisitorException { return true; }	public boolean visitPre( LowPass node ) throws QueryBuilderVisitorException { return true; }	public boolean visitPre( Not node ) throws QueryBuilderVisitorException  { return true; }	public boolean visitPre( Or node ) throws QueryBuilderVisitorException { return true; }	public boolean visitPre( OrderedAnd node ) throws QueryBuilderVisitorException { return true; }	public boolean visitPre( Align node ) throws QueryBuilderVisitorException { return true; }	public boolean visitPre( MultiTerm node ) throws QueryBuilderVisitorException { return true; }	public boolean visitPre( Select node ) throws QueryBuilderVisitorException { return true; }	public boolean visitPre( Difference node ) throws QueryBuilderVisitorException { return true; }}