| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| |
| package org.apache.directory.api.ldap.aci; |
| |
| |
| import java.io.StringReader; |
| import java.text.ParseException; |
| |
| import org.apache.directory.api.i18n.I18n; |
| import org.apache.directory.api.ldap.model.schema.SchemaManager; |
| |
| import antlr.RecognitionException; |
| import antlr.TokenStreamException; |
| |
| |
| /** |
| * A reusable wrapper around the antlr generated parser for an ACIItem as |
| * defined by X.501. This class enables the reuse of the antlr parser/lexer pair |
| * without having to recreate them every time. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class ACIItemChecker |
| { |
| /** the antlr generated parser being wrapped */ |
| private ReusableAntlrACIItemParser checker; |
| |
| /** the antlr generated lexer being wrapped */ |
| private ReusableAntlrACIItemLexer lexer; |
| |
| |
| /** |
| * Creates a ACIItem parser. |
| * |
| * @param schemaManager the schema manager |
| */ |
| public ACIItemChecker( SchemaManager schemaManager ) |
| { |
| this.lexer = new ReusableAntlrACIItemLexer( new StringReader( "" ) ); |
| this.checker = new ReusableAntlrACIItemParser( lexer ); |
| this.checker.init( schemaManager ); |
| } |
| |
| |
| /** |
| * Initializes the plumbing by creating a pipe and coupling the parser/lexer |
| * pair with it. param spec the specification to be parsed |
| */ |
| private synchronized void reset( String spec ) |
| { |
| StringReader in = new StringReader( spec ); |
| this.lexer.prepareNextInput( in ); |
| this.checker.resetState(); |
| } |
| |
| |
| /** |
| * Parses an ACIItem without exhausting the parser. |
| * |
| * @param spec |
| * the specification to be parsed |
| * @throws ParseException |
| * if there are any recognition errors (bad syntax) |
| */ |
| public synchronized void parse( String spec ) throws ParseException |
| { |
| if ( spec == null || spec.trim().equals( "" ) ) |
| { |
| return; |
| } |
| |
| // reset and initialize the parser / lexer pair |
| reset( spec ); |
| |
| try |
| { |
| this.checker.wrapperEntryPoint(); |
| } |
| catch ( TokenStreamException e ) |
| { |
| throw new ParseException( I18n |
| .err( I18n.ERR_04004_PARSER_FAILURE_ACI_ITEM, spec, e.getLocalizedMessage() ), 0 ); |
| } |
| catch ( RecognitionException e ) |
| { |
| throw new ParseException( I18n |
| .err( I18n.ERR_04004_PARSER_FAILURE_ACI_ITEM, spec, e.getLocalizedMessage() ), e.getColumn() ); |
| } |
| } |
| |
| } |