| /* |
| * 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.eagle.query.aggregate; |
| |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| public enum SortFieldOrderType { |
| key("^(key)=(asc|desc)$"), |
| count("^(count)=(asc|desc)$"), |
| sum("^sum\\((.*)\\)=(asc|desc)$"), |
| avg("^avg\\((.*)\\)(asc|desc)$"), |
| max("^max\\((.*)\\)(asc|desc)$"), |
| min("^min\\((.*)\\)(asc|desc)$"); |
| |
| private Pattern pattern; |
| private SortFieldOrderType(String patternString) { |
| this.pattern = Pattern.compile(patternString); |
| } |
| |
| /** |
| * This method is thread safe |
| * match and retrieve back the aggregated fields, for count, aggregateFields can be null |
| * @param sortFieldOrder |
| * @return |
| */ |
| public SortFieldOrderTypeMatcher matcher(String sortFieldOrder) { |
| Matcher m = pattern.matcher(sortFieldOrder); |
| |
| if (m.find()) { |
| return new SortFieldOrderTypeMatcher(true, m.group(1), m.group(2)); |
| } else { |
| return new SortFieldOrderTypeMatcher(false, null, null); |
| } |
| } |
| |
| public static AggregateParams.SortFieldOrder matchAll(String sortFieldOrder) { |
| for (SortFieldOrderType type : SortFieldOrderType.values()) { |
| SortFieldOrderTypeMatcher m = type.matcher(sortFieldOrder); |
| if (m.find()) { |
| return m.sortFieldOrder(); |
| } |
| } |
| return null; |
| } |
| } |