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 * An empty class used for the (ObjectClass=*) node. 024 * 025 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 026 * @version $Rev$, $Date$ 027 */ 028public final class ObjectClassNode extends AbstractExprNode 029{ 030 /** A static instance of this node */ 031 public static final ExprNode OBJECT_CLASS_NODE = new ObjectClassNode(); 032 033 034 /** 035 * Creates a new instance of ObjectClassNode. 036 */ 037 private ObjectClassNode() 038 { 039 super( AssertionType.OBJECTCLASS ); 040 } 041 042 043 /** 044 * {@inheritDoc} 045 * 046 * This implementation always returns true. 047 */ 048 @Override 049 public boolean isLeaf() 050 { 051 return true; 052 } 053 054 055 /** 056 * {@inheritDoc} 057 * 058 * This implementation always returns null. 059 */ 060 @Override 061 public Object accept( FilterVisitor visitor ) 062 { 063 return null; 064 } 065 066 067 /** 068 * Tells if this Node is Schema aware. 069 * 070 * @return true if the Node is SchemaAware 071 */ 072 @Override 073 public boolean isSchemaAware() 074 { 075 return true; 076 } 077 078 079 /** 080 * {@inheritDoc} 081 */ 082 @Override 083 public String toString() 084 { 085 return "All"; 086 } 087}