1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * https://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 *
19 */
20 package org.apache.directory.api.ldap.model.filter;
21
22 /**
23 * An empty class used for the (ObjectClass=*) node.
24 *
25 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
26 * @version $Rev$, $Date$
27 */
28 public final class ObjectClassNode extends AbstractExprNode
29 {
30 /** A static instance of this node */
31 public static final ExprNode OBJECT_CLASS_NODE = new ObjectClassNode();
32
33
34 /**
35 * Creates a new instance of ObjectClassNode.
36 */
37 private ObjectClassNode()
38 {
39 super( AssertionType.OBJECTCLASS );
40 }
41
42
43 /**
44 * {@inheritDoc}
45 *
46 * This implementation always returns true.
47 */
48 @Override
49 public boolean isLeaf()
50 {
51 return true;
52 }
53
54
55 /**
56 * {@inheritDoc}
57 *
58 * This implementation always returns null.
59 */
60 @Override
61 public Object accept( FilterVisitor visitor )
62 {
63 return null;
64 }
65
66
67 /**
68 * Tells if this Node is Schema aware.
69 *
70 * @return true if the Node is SchemaAware
71 */
72 @Override
73 public boolean isSchemaAware()
74 {
75 return true;
76 }
77
78
79 /**
80 * {@inheritDoc}
81 */
82 @Override
83 public String toString()
84 {
85 return "All";
86 }
87 }