001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020package org.apache.directory.api.ldap.model.filter; 021 022 023/** 024 * An empty class used for the (ObjectClass=*) node. 025 * 026 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 027 * @version $Rev$, $Date$ 028 */ 029public final class ObjectClassNode extends AbstractExprNode 030{ 031 /** A static instance of this node */ 032 public static final ExprNode OBJECT_CLASS_NODE = new ObjectClassNode(); 033 034 035 /** 036 * Creates a new instance of ObjectClassNode. 037 */ 038 private ObjectClassNode() 039 { 040 super( AssertionType.OBJECTCLASS ); 041 } 042 043 044 /** 045 * {@inheritDoc} 046 * 047 * This implementation always returns true. 048 */ 049 @Override 050 public boolean isLeaf() 051 { 052 return true; 053 } 054 055 056 /** 057 * {@inheritDoc} 058 * 059 * This implementation always returns null. 060 */ 061 @Override 062 public Object accept( FilterVisitor visitor ) 063 { 064 return null; 065 } 066 067 068 /** 069 * {@inheritDoc} 070 */ 071 @Override 072 public String toString() 073 { 074 return "All"; 075 } 076}