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 023import org.apache.directory.api.i18n.I18n; 024 025 026/** 027 * Node used for the application of arbitrary predicates on return candidates. 028 * Applies dynamic and programatic criteria for the selection of candidates for 029 * return. Nodes of this type may be introduced into the filter expression to 030 * provided the opportunity to constrain the search further without altering the 031 * search algorithm. 032 * 033 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 034 */ 035public abstract class AssertionNode extends AbstractExprNode 036{ 037 /** The assertion or predicate to apply */ 038 private final Assertion assertion; 039 040 /** Description of assertion for polish printouts */ 041 private final String desc; 042 043 044 // ------------------------------------------------------------------------ 045 // C O N S T R U C T O R S 046 // ------------------------------------------------------------------------ 047 048 /** 049 * Creates an AssertionNode using an arbitrary candidate assertion. 050 * 051 * @param assertion the arbitrary selection logic. 052 */ 053 public AssertionNode( Assertion assertion ) 054 { 055 this( assertion, "ASSERTION" ); 056 057 isSchemaAware = true; 058 } 059 060 061 /** 062 * Creates an AssertionNode using an arbitrary candidate assertion with a 063 * descriptions used for filter AST walker dumps. 064 * 065 * @param assertion the arbitrary selection logic. 066 * @param desc the printout representation for filter prints. 067 */ 068 public AssertionNode( Assertion assertion, String desc ) 069 { 070 super( AssertionType.ASSERTION ); 071 this.desc = desc; 072 this.assertion = assertion; 073 074 /* 075 * We never want this node to ever make it to the point of becoming a 076 * candidate for use in an enumeration so we set the scan count to the 077 * maximum value. 078 */ 079 set( "count", Long.MAX_VALUE ); 080 } 081 082 083 /** 084 * Makes a full clone in new memory space of the current node and children 085 * 086 * @return the clone 087 */ 088 @Override 089 public ExprNode clone() 090 { 091 return ( ExprNode ) super.clone(); 092 } 093 094 095 /** 096 * Gets the Assertion used by this assertion node. 097 * 098 * @return the assertion used by this node 099 */ 100 public Assertion getAssertion() 101 { 102 return assertion; 103 } 104 105 106 // ------------------------------------------------------------------------ 107 // A B S T R A C T M E T H O D I M P L E M E N T A T I O N S 108 // ------------------------------------------------------------------------ 109 110 /** 111 * Always returns true since an AssertionNode has no children. 112 * 113 * @see ExprNode#isLeaf() 114 * @return true if the node is a leaf,false otherwise 115 */ 116 public boolean isLeaf() 117 { 118 return true; 119 } 120 121 122 /** 123 * @see ExprNode#printRefinementToBuffer(StringBuilder) 124 */ 125 public StringBuilder printRefinementToBuffer( StringBuilder buf ) throws UnsupportedOperationException 126 { 127 throw new UnsupportedOperationException( I18n.err( I18n.ERR_04145 ) ); 128 } 129 130 131 /** 132 * {@inheritDoc} 133 */ 134 @Override 135 public boolean equals( Object obj ) 136 { 137 if ( obj == this ) 138 { 139 return true; 140 } 141 142 if ( ( obj == null ) || !( obj instanceof AssertionNode ) ) 143 { 144 return false; 145 } 146 AssertionNode that = ( AssertionNode ) obj; 147 if ( assertion == null ) 148 { 149 if ( that.assertion != null ) 150 { 151 return false; 152 } 153 } 154 else 155 { 156 if ( !assertion.equals( that.assertion ) ) 157 { 158 return false; 159 } 160 } 161 if ( desc == null ) 162 { 163 if ( that.desc != null ) 164 { 165 return false; 166 } 167 } 168 else 169 { 170 if ( !desc.equals( that.desc ) ) 171 { 172 return false; 173 } 174 } 175 return super.equals( obj ); 176 } 177 178 179 /** 180 * @see Object#hashCode() 181 * @return the instance's hash code 182 */ 183 @Override 184 public int hashCode() 185 { 186 int h = 37; 187 188 h = h * 17 + super.hashCode(); 189 h = h * 17 + ( assertion != null ? assertion.hashCode() : 0 ); 190 h = h * 17 + ( desc != null ? desc.hashCode() : 0 ); 191 192 return h; 193 } 194 195 196 /** 197 * @see ExprNode#accept( 198 *FilterVisitor) 199 */ 200 public Object accept( FilterVisitor visitor ) 201 { 202 return visitor.visit( this ); 203 } 204 205 206 /** 207 * @see Object#toString 208 * @return A string representing the AndNode 209 */ 210 public String toString() 211 { 212 StringBuilder buf = new StringBuilder(); 213 214 buf.append( "(@" ); 215 buf.append( desc ); 216 buf.append( super.toString() ); 217 buf.append( ')' ); 218 219 return buf.toString(); 220 } 221}