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.camel.processor;
019
020import static java.net.URLEncoder.encode;
021
022import java.io.IOException;
023
024import org.apache.camel.Exchange;
025import org.apache.camel.Message;
026import org.apache.camel.Processor;
027
028/**
029 * Represents a Processor class that formulates a Sparql DESCRIBE query
030 * that is ready to be POSTed to a Sparql endpoint.
031 *
032 * The processor expects the following headers:
033 *      org.fcrepo.jms.identifier
034 *      org.fcrepo.jms.baseURL
035 * each of which can be overridden with the following:
036 *      FCREPO_IDENTIFIER
037 *      FCREPO_BASE_URL
038 *
039 * @author Aaron Coburn
040 * @since November 6, 2014
041 */
042public class SparqlDescribeProcessor implements Processor {
043    /**
044     *  Define how this message should be processed
045     *
046     *  @param exchange the current camel message exchange
047     */
048    public void process(final Exchange exchange) throws IOException {
049
050        final Message in = exchange.getIn();
051        final String subject = ProcessorUtils.getSubjectUri(in);
052
053        exchange.getIn().setBody("query=" + encode("DESCRIBE <" + subject + ">", "UTF-8"));
054        exchange.getIn().setHeader(Exchange.HTTP_METHOD, "POST");
055        exchange.getIn().setHeader(Exchange.ACCEPT_CONTENT_TYPE, "application/rdf+xml");
056        exchange.getIn().setHeader(Exchange.CONTENT_TYPE, "application/x-www-form-urlencoded; charset=utf-8");
057    }
058}