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.kernel.api.rdf;
019
020import java.io.File;
021import java.io.IOException;
022import java.util.HashMap;
023import java.util.Map;
024
025import org.fcrepo.kernel.api.utils.AutoReloadingConfiguration;
026
027import com.fasterxml.jackson.core.type.TypeReference;
028import com.fasterxml.jackson.databind.ObjectMapper;
029import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
030
031/**
032 * Registry of RDF namespaces
033 *
034 * @author bbpennel
035 */
036public class RdfNamespaceRegistry extends AutoReloadingConfiguration {
037
038    private Map<String, String> namespaces;
039
040    /**
041     * Load the namespace prefix to URI configuration file
042     */
043    @Override
044    protected synchronized void loadConfiguration() throws IOException {
045        final ObjectMapper mapper = new ObjectMapper(new YAMLFactory());
046        final TypeReference<HashMap<String, String>> typeRef = new TypeReference<HashMap<String, String>>() {};
047        namespaces = mapper.readValue(new File(configPath), typeRef);
048    }
049
050    /**
051     * Get the mapping of namespace prefixes to URIs
052     *
053     * @return map of namespace prefixes to URIs, or an empty map if no mapping was provided.
054     */
055    public Map<String, String> getNamespaces() {
056        if (namespaces == null) {
057            namespaces = new HashMap<>();
058        }
059        return namespaces;
060    }
061
062    /**
063     * Set the mapping of namespace prefixes to URIs
064     *
065     * @param namespaces mapping of namespaces
066     */
067    public void setNamespaces(final Map<String, String> namespaces) {
068        this.namespaces = namespaces;
069    }
070}