001/*
002 * Licensed to DuraSpace under one or more contributor license agreements.
003 * See the NOTICE file distributed with this work for additional information
004 * regarding copyright ownership.
005 *
006 * DuraSpace licenses this file to you under the Apache License,
007 * Version 2.0 (the "License"); you may not use this file except in
008 * compliance with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.fcrepo.http.commons.exceptionhandlers;
019
020import static javax.ws.rs.core.Response.status;
021import static javax.ws.rs.core.Response.Status.BAD_REQUEST;
022import static org.slf4j.LoggerFactory.getLogger;
023
024import java.util.regex.Matcher;
025import java.util.regex.Pattern;
026
027import javax.ws.rs.core.Response;
028import javax.ws.rs.ext.ExceptionMapper;
029import javax.ws.rs.ext.Provider;
030
031import org.slf4j.Logger;
032
033import com.hp.hpl.jena.query.QueryParseException;
034
035
036/**
037 * Handles Sparql query parsing exceptions thrown when querying or updating.
038 *
039 * @author whikloj
040 * @since September 9, 2014
041 */
042@Provider
043public class QueryParseExceptionMapper implements
044        ExceptionMapper<QueryParseException>, ExceptionDebugLogging {
045
046    private static final Logger LOGGER = getLogger(QueryParseExceptionMapper.class);
047
048    @Override
049    public Response toResponse(final QueryParseException e) {
050
051        LOGGER.error("Captured a query parse exception {}", e.getMessage());
052        debugException(this, e, LOGGER);
053        if (e.getMessage().matches(".* Unresolved prefixed name: .*")) {
054            final Pattern namespacePattern =
055                Pattern.compile("Unresolved prefixed name: (\\w+:\\w+)");
056            final Matcher namespaceMatch =
057                namespacePattern.matcher(e.getMessage());
058            if (namespaceMatch.find()) {
059                final String msg =
060                    String.format(
061                        "There are one or more undefined namespace(s) in your request [ %s ], " +
062                        "please define them before retrying",
063                        namespaceMatch.group(1));
064                return status(BAD_REQUEST).entity(msg).build();
065            }
066        }
067
068        return status(BAD_REQUEST).entity(e.getMessage()).build();
069    }
070
071}