| /** |
| * 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.oozie; |
| |
| import com.google.common.base.Strings; |
| import com.google.common.collect.LinkedListMultimap; |
| import com.google.common.collect.ListMultimap; |
| import org.apache.oozie.servlet.XServletException; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServletResponse; |
| import java.util.StringTokenizer; |
| |
| public class FilterParser { |
| |
| private static final String PARAMETER_DELIMITER = ";"; |
| private static final String PARAMETER_EQUALS = "="; |
| |
| /** |
| * Parse filter string to a map with key = filter name and values = filter values |
| * |
| * @param filterString the filter string |
| * @return filter key and values map |
| * @throws ServletException thrown if failed to parse filter string |
| */ |
| public static ListMultimap<String, String> parseFilter(String filterString) throws ServletException { |
| ListMultimap<String, String> filterFieldMap = LinkedListMultimap.create(); |
| if (filterString != null) { |
| StringTokenizer st = new StringTokenizer(filterString, PARAMETER_DELIMITER); |
| while (st.hasMoreTokens()) { |
| String token = st.nextToken(); |
| if (token.contains(PARAMETER_EQUALS)) { |
| String[] nameValuePair = token.split(PARAMETER_EQUALS); |
| if (nameValuePair.length != 2) { |
| filterFormatError(filterString); |
| } |
| String key = nameValuePair[0]; |
| String value = nameValuePair[1]; |
| if (Strings.isNullOrEmpty(key)) { |
| filterFormatError(filterString); |
| } |
| filterFieldMap.put(key, value); |
| } |
| else { |
| filterFormatError(filterString); |
| } |
| } |
| } |
| return filterFieldMap; |
| } |
| |
| private static void filterFormatError(String filterString) throws ServletException { |
| throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401, |
| String.format("elements must be semicolon-separated name=value pairs but was %s", filterString)); |
| |
| } |
| } |