1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one * 3 * or more contributor license agreements. See the NOTICE file * 4 * distributed with this work for additional information * 5 * regarding copyright ownership. The ASF licenses this file * 6 * to you under the Apache License, Version 2.0 (the * 7 * "License"); you may not use this file except in compliance * 8 * with the License. You may obtain a copy of the License at * 9 * * 10 * http://www.apache.org/licenses/LICENSE-2.0 * 11 * * 12 * Unless required by applicable law or agreed to in writing, * 13 * software distributed under the License is distributed on an * 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * 15 * KIND, either express or implied. See the License for the * 16 * specific language governing permissions and limitations * 17 * under the License. * 18 */ 19 package org.apache.rat.configuration.builders; 20 21 import java.util.regex.Pattern; 22 23 import org.apache.rat.ConfigurationException; 24 import org.apache.rat.analysis.matchers.SimpleRegexMatcher; 25 26 /** 27 * A builder for the regex matcher. 28 */ 29 public class RegexBuilder extends AbstractBuilder { 30 31 private Pattern pattern; 32 33 /** 34 * Sets the regex expression. This method compiles the string into a pattern and 35 * may throw any exception thrown by the {@code Pattern.compile(String)} method. 36 * @param exp the expression as a string. 37 * @return this builder for chaining. 38 * @see Pattern#compile(String) 39 */ 40 public RegexBuilder setExpr(String exp) { 41 this.pattern = exp == null ? null : Pattern.compile(exp); 42 return this; 43 } 44 45 @Override 46 public SimpleRegexMatcher build() { 47 if (null == pattern) { 48 throw new ConfigurationException("'regex' type matcher requires an expression"); 49 } 50 return new SimpleRegexMatcher(getId(), pattern); 51 } 52 53 @Override 54 public String toString() { 55 return String.format("RegexBuilder: %s", pattern == null ? null : pattern.pattern()); 56 } 57 58 }