| /* |
| * 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 |
| * |
| * https://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.ant.props.stringops; |
| |
| import org.apache.ant.props.RegexBasedEvaluator; |
| import org.apache.tools.ant.BuildException; |
| import org.apache.tools.ant.PropertyHelper; |
| |
| /** |
| * Require property operation. |
| */ |
| public class RequireProperty extends RegexBasedEvaluator { |
| private static final String DEFAULT_MESSAGE = "Missing required property "; |
| |
| /** |
| * Construct a new RequireProperty operation. |
| */ |
| public RequireProperty() { |
| super("^(.*):\\?(.*)$"); |
| } |
| |
| /** {@inheritDoc} */ |
| protected Object evaluate(String[] groups, PropertyHelper propertyHelper) { |
| String result = (String) propertyHelper.getProperty(groups[1]); |
| if (result == null) { |
| String message = "".equals(groups[2]) ? DEFAULT_MESSAGE + groups[1] : groups[2]; |
| throw new BuildException(message); |
| } |
| return result; |
| } |
| } |