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. * */import it.unimi.dsi.lang.MutableString;/** A node representing a set of terms defined by a common prefix. *  * @author Sebastiano Vigna */public class Prefix implements Query {	/** The common prefix of the set of terms represented by this node. */	public final CharSequence prefix;		public Prefix( final CharSequence prefix ) {		this.prefix = prefix;	}		public String toString() {		return new MutableString().append( prefix ).append( '*' ).toString();	}	public <T> T accept( final QueryBuilderVisitor<T> visitor ) throws QueryBuilderVisitorException {		return visitor.visit( this );	}	public boolean equals( final Object o ) {		if ( ! ( o instanceof Prefix) ) return false;		return prefix.equals( ((Prefix)o).prefix );	}		public int hashCode() {		return prefix.hashCode() ^ getClass().hashCode();	}}