| /* |
| * 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.jena.sparql.expr; |
| |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| import java.util.regex.PatternSyntaxException; |
| |
| public class RegexJava implements RegexEngine |
| { |
| private Pattern regexPattern; |
| |
| public RegexJava(String pattern, String flags) { |
| regexPattern = makePattern("Regex", pattern, flags); |
| } |
| |
| @Override |
| public boolean match(String s) { |
| Matcher m = regexPattern.matcher(s); |
| return m.find(); |
| } |
| |
| public static Pattern makePattern(String label, String patternStr, String flags) { |
| try { |
| int mask = 0; |
| if ( flags != null ) { |
| mask = makeMask(flags); |
| if ( flags.contains("q") ) |
| patternStr = Pattern.quote(patternStr); |
| } |
| return Pattern.compile(patternStr, mask); |
| } |
| catch (PatternSyntaxException pEx) { |
| throw new ExprEvalException(label+" pattern exception: " + pEx); |
| } |
| } |
| |
| public static int makeMask(String modifiers) { |
| if ( modifiers == null ) |
| return 0; |
| |
| int newMask = 0; |
| for ( int i = 0; i < modifiers.length(); i++ ) { |
| switch (modifiers.charAt(i)) { |
| case 'i': |
| newMask |= Pattern.UNICODE_CASE; |
| newMask |= Pattern.CASE_INSENSITIVE; |
| break; |
| case 'm': newMask |= Pattern.MULTILINE; break; |
| case 's': newMask |= Pattern.DOTALL; break; |
| // Not suported by Java regex |
| //case 'x': newMask |= Pattern.; break; |
| case 'q':; break; |
| |
| default: |
| throw new ExprEvalException("Unsupported flag in regex modifiers: "+modifiers.charAt(i)); |
| } |
| } |
| return newMask; |
| } |
| } |