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.schema.syntaxCheckers; 021 022 023import org.apache.directory.api.ldap.model.constants.SchemaConstants; 024import org.apache.directory.api.ldap.model.schema.SyntaxChecker; 025import org.apache.directory.api.util.Strings; 026import org.slf4j.Logger; 027import org.slf4j.LoggerFactory; 028 029 030/** 031 * A SyntaxChecker which verifies that a value is a valid DerefAlias. We 032 * have four possible values : 033 * <ul> 034 * <li>NEVER</li> 035 * <li>SEARCHING</li> 036 * <li>FINDING</li> 037 * <li>ALWAYS</li> 038 * </ul> 039 * The value is case insensitive 040 * 041 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 042 */ 043@SuppressWarnings("serial") 044public class DerefAliasSyntaxChecker extends SyntaxChecker 045{ 046 /** A logger for this class */ 047 private static final Logger LOG = LoggerFactory.getLogger( DerefAliasSyntaxChecker.class ); 048 049 050 /** 051 * Creates a new instance of DerefAliasSyntaxChecker. 052 */ 053 public DerefAliasSyntaxChecker() 054 { 055 super( SchemaConstants.DEREF_ALIAS_SYNTAX ); 056 } 057 058 059 /** 060 * {@inheritDoc} 061 */ 062 public boolean isValidSyntax( Object value ) 063 { 064 String strValue = null; 065 066 if ( value == null ) 067 { 068 LOG.debug( "Syntax invalid for 'null'" ); 069 return false; 070 } 071 072 if ( value instanceof String ) 073 { 074 strValue = ( String ) value; 075 } 076 else if ( value instanceof byte[] ) 077 { 078 strValue = Strings.utf8ToString( ( byte[] ) value ); 079 } 080 else 081 { 082 strValue = value.toString(); 083 } 084 085 strValue = Strings.trim( Strings.toLowerCase( strValue ) ); 086 087 return ( "never".equals( strValue ) || 088 "finding".equals( strValue ) || 089 "searching".equals( strValue ) || "always".equals( strValue ) ); 090 } 091}