| /* |
| * 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.fuseki.servlets; |
| |
| import java.util.Enumeration; |
| |
| import javax.servlet.http.HttpServletRequest; |
| |
| import org.apache.jena.riot.web.HttpNames; |
| |
| public abstract class GSP_Base extends ActionREST { |
| |
| protected GSP_Base() {} |
| |
| @Override |
| public void validate(HttpAction action) { |
| if ( isQuads(action) ) |
| validateQuads(action); |
| else |
| validateGSP(action); |
| } |
| |
| protected static boolean isQuads(HttpAction action) { |
| return action.request.getQueryString() == null; |
| } |
| |
| private static void validateQuads(HttpAction action) { } |
| |
| /** |
| * Test a SPARQL GSP request; if there are any protocol errors, respond |
| * by throwing {@link ActionErrorException} with a specific error messages to the problem |
| * identified. |
| */ |
| private static void validateGSP(HttpAction action) { |
| HttpServletRequest request = action.request; |
| if ( request.getQueryString() == null ) |
| ServletOps.errorBadRequest("No query string. ?default or ?graph required."); |
| |
| String g = request.getParameter(HttpNames.paramGraph); |
| String d = request.getParameter(HttpNames.paramGraphDefault); |
| |
| if ( g != null && d != null ) |
| ServletOps.errorBadRequest("Both ?default and ?graph in the query string of the request"); |
| |
| if ( g == null && d == null ) |
| ServletOps.errorBadRequest("Neither ?default nor ?graph in the query string of the request"); |
| |
| int x1 = SPARQLProtocol.countParamOccurences(request, HttpNames.paramGraph); |
| int x2 = SPARQLProtocol.countParamOccurences(request, HttpNames.paramGraphDefault); |
| |
| if ( x1 > 1 ) |
| ServletOps.errorBadRequest("Multiple ?default in the query string of the request"); |
| if ( x2 > 1 ) |
| ServletOps.errorBadRequest("Multiple ?graph in the query string of the request"); |
| |
| Enumeration<String> en = request.getParameterNames(); |
| for (; en.hasMoreElements(); ) { |
| String h = en.nextElement(); |
| if ( !HttpNames.paramGraph.equals(h) && !HttpNames.paramGraphDefault.equals(h) ) |
| ServletOps.errorBadRequest("Unknown parameter '" + h + "'"); |
| // one of ?default and &graph |
| if ( request.getParameterValues(h).length != 1 ) |
| ServletOps.errorBadRequest("Multiple parameters '" + h + "'"); |
| } |
| } |
| } |