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 */ 020 021package org.apache.directory.api.ldap.extras.controls.vlv_impl; 022 023 024import org.apache.directory.api.asn1.ber.grammar.AbstractGrammar; 025import org.apache.directory.api.asn1.ber.grammar.Grammar; 026import org.apache.directory.api.asn1.ber.grammar.GrammarTransition; 027import org.apache.directory.api.asn1.ber.tlv.UniversalTag; 028import org.slf4j.Logger; 029import org.slf4j.LoggerFactory; 030 031 032/** 033 * The VLV grammar. It's an implementation of https://www.ietf.org/archive/id/draft-ietf-ldapext-ldapv3-vlv-09.txt 034 * 035 * Here is the grammar : 036 * 037 * <pre> 038 * VirtualListViewRequest ::= SEQUENCE { 039 * beforeCount INTEGER (0..maxInt), 040 * afterCount INTEGER (0..maxInt), 041 * target CHOICE { 042 * byOffset [0] SEQUENCE { 043 * offset INTEGER (1 .. maxInt), 044 * contentCount INTEGER (0 .. maxInt) 045 * }, 046 * greaterThanOrEqual [1] AssertionValue 047 * }, 048 * contextID OCTET STRING OPTIONAL 049 * } 050 * </pre> 051 * 052 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 053 */ 054public final class VirtualListViewRequestGrammar extends AbstractGrammar<VirtualListViewRequestContainer> 055{ 056 static final Logger LOG = LoggerFactory.getLogger( VirtualListViewRequestGrammar.class ); 057 058 static final boolean IS_DEBUG = LOG.isDebugEnabled(); 059 060 private static Grammar<?> instance = new VirtualListViewRequestGrammar(); 061 062 063 /** 064 * Creates a new VirtualListViewRequestGrammar object. 065 */ 066 @SuppressWarnings("unchecked") 067 private VirtualListViewRequestGrammar() 068 { 069 setName( VirtualListViewRequestGrammar.class.getName() ); 070 071 super.transitions = new GrammarTransition[VirtualListViewRequestStates.END_STATE.ordinal()][256]; 072 073 super.transitions[VirtualListViewRequestStates.START_STATE.ordinal()][UniversalTag.SEQUENCE.getValue()] = 074 new GrammarTransition<VirtualListViewRequestContainer>( 075 VirtualListViewRequestStates.START_STATE, 076 VirtualListViewRequestStates.VLV_SEQUENCE_STATE, 077 UniversalTag.SEQUENCE.getValue(), 078 null ); 079 080 super.transitions[VirtualListViewRequestStates.VLV_SEQUENCE_STATE.ordinal()][UniversalTag.INTEGER.getValue()] = 081 new GrammarTransition<VirtualListViewRequestContainer>( 082 VirtualListViewRequestStates.VLV_SEQUENCE_STATE, 083 VirtualListViewRequestStates.VLV_BEFORE_COUNT_STATE, 084 UniversalTag.INTEGER.getValue(), 085 new StoreBeforeCount() ); 086 087 super.transitions[VirtualListViewRequestStates.VLV_BEFORE_COUNT_STATE.ordinal()][UniversalTag.INTEGER 088 .getValue()] = 089 new GrammarTransition<VirtualListViewRequestContainer>( 090 VirtualListViewRequestStates.VLV_BEFORE_COUNT_STATE, 091 VirtualListViewRequestStates.VLV_AFTER_COUNT_STATE, 092 UniversalTag.INTEGER.getValue(), 093 new StoreAfterCount() ); 094 095 super.transitions[VirtualListViewRequestStates.VLV_AFTER_COUNT_STATE.ordinal()][VirtualListViewerTags.BY_OFFSET_TAG 096 .getValue()] = 097 new GrammarTransition<VirtualListViewRequestContainer>( 098 VirtualListViewRequestStates.VLV_AFTER_COUNT_STATE, 099 VirtualListViewRequestStates.VLV_TARGET_BY_OFFSET_STATE, 100 ( byte ) VirtualListViewerTags.BY_OFFSET_TAG.getValue(), 101 null ); 102 103 super.transitions[VirtualListViewRequestStates.VLV_AFTER_COUNT_STATE.ordinal()][VirtualListViewerTags.ASSERTION_VALUE_TAG 104 .getValue()] = 105 new GrammarTransition<VirtualListViewRequestContainer>( 106 VirtualListViewRequestStates.VLV_AFTER_COUNT_STATE, 107 VirtualListViewRequestStates.VLV_ASSERTION_VALUE_STATE, 108 ( byte ) VirtualListViewerTags.ASSERTION_VALUE_TAG.getValue(), 109 new StoreAssertionValue() ); 110 111 super.transitions[VirtualListViewRequestStates.VLV_TARGET_BY_OFFSET_STATE.ordinal()][UniversalTag.INTEGER 112 .getValue()] = 113 new GrammarTransition<VirtualListViewRequestContainer>( 114 VirtualListViewRequestStates.VLV_TARGET_BY_OFFSET_STATE, 115 VirtualListViewRequestStates.VLV_OFFSET_STATE, 116 UniversalTag.INTEGER.getValue(), 117 new StoreOffset() ); 118 119 super.transitions[VirtualListViewRequestStates.VLV_OFFSET_STATE.ordinal()][UniversalTag.INTEGER.getValue()] = 120 new GrammarTransition<VirtualListViewRequestContainer>( 121 VirtualListViewRequestStates.VLV_OFFSET_STATE, 122 VirtualListViewRequestStates.VLV_CONTENT_COUNT_STATE, 123 UniversalTag.INTEGER.getValue(), 124 new StoreContentCount() ); 125 126 super.transitions[VirtualListViewRequestStates.VLV_CONTENT_COUNT_STATE.ordinal()][UniversalTag.OCTET_STRING 127 .getValue()] = 128 new GrammarTransition<VirtualListViewRequestContainer>( 129 VirtualListViewRequestStates.VLV_CONTENT_COUNT_STATE, 130 VirtualListViewRequestStates.VLV_CONTEXT_ID_STATE, 131 UniversalTag.OCTET_STRING.getValue(), 132 new StoreContextId() ); 133 134 super.transitions[VirtualListViewRequestStates.VLV_ASSERTION_VALUE_STATE.ordinal()][UniversalTag.OCTET_STRING 135 .getValue()] = 136 new GrammarTransition<VirtualListViewRequestContainer>( 137 VirtualListViewRequestStates.VLV_ASSERTION_VALUE_STATE, 138 VirtualListViewRequestStates.VLV_CONTEXT_ID_STATE, 139 UniversalTag.OCTET_STRING.getValue(), 140 new StoreContextId() ); 141 } 142 143 144 /** 145 * @return the singleton instance of the VirtualListViewRequestGrammar 146 */ 147 public static Grammar<?> getInstance() 148 { 149 return instance; 150 } 151}