| /* |
| * 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.any23.rdf; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.util.Locale; |
| import java.util.Map; |
| import java.util.Properties; |
| |
| /** |
| * This class act as a container for various well-known and adopted <i>RDF</i> Vocabulary prefixes. |
| */ |
| public class PopularPrefixes { |
| |
| private static final Logger logger = LoggerFactory.getLogger(PopularPrefixes.class); |
| |
| private static final String RESOURCE_NAME = "/org/apache/any23/prefixes/prefixes.properties"; |
| |
| private static final Prefixes popularPrefixes = getPrefixes(); |
| |
| private static Prefixes getPrefixes() { |
| Prefixes prefixes = new Prefixes(); |
| Properties properties = new Properties(); |
| try { |
| logger.trace(String.format(Locale.ROOT, "Loading prefixes from %s", RESOURCE_NAME)); |
| properties.load(getResourceAsStream()); |
| } catch (IOException e) { |
| logger.error(String.format(Locale.ROOT, "Error while loading prefixes from %s", RESOURCE_NAME), e); |
| throw new RuntimeException(String.format(Locale.ROOT, "Error while loading prefixes from %s", RESOURCE_NAME)); |
| } |
| for (Map.Entry entry : properties.entrySet()) { |
| if (testIRICompliance((String) entry.getValue())) { |
| prefixes.add( |
| (String) entry.getKey(), |
| (String) entry.getValue() |
| ); |
| } else { |
| logger.warn(String.format(Locale.ROOT, "Prefixes entry '%s' is not a well-formad IRI. Skipped.", entry.getValue())); |
| } |
| } |
| return prefixes; |
| } |
| |
| /** |
| * This method perform a prefix lookup. Given a set of prefixes it returns {@link Prefixes} bag |
| * class containing them. |
| * |
| * @param prefixes the input prefixes where perform the lookup |
| * @return a {@link Prefixes} containing all the prefixes mathing the input parameter |
| */ |
| public static Prefixes createSubset(String... prefixes) { |
| return popularPrefixes.createSubset(prefixes); |
| } |
| |
| /** |
| * @return a {@link Prefixes} with a set of well-known prefixes |
| */ |
| public static Prefixes get() { |
| return popularPrefixes; |
| } |
| |
| /** |
| * Checks the compliance of the <i>IRI</i>. |
| * |
| * @param stringUri the string of the IRI to be checked |
| * @return <code>true</code> if <i> stringUri</i> is a valid IRI, |
| * <code>false</code> otherwise. |
| */ |
| private static boolean testIRICompliance(String stringUri) { |
| try { |
| new URI(stringUri); |
| } catch (URISyntaxException e) { |
| return false; |
| } |
| return true; |
| } |
| |
| /** |
| * Loads the prefixes list configuration file. |
| * |
| * @return the input stream containing the configuration. |
| */ |
| private static InputStream getResourceAsStream() { |
| InputStream result; |
| result = PopularPrefixes.class.getResourceAsStream(RESOURCE_NAME); |
| if (result == null) { |
| result = PopularPrefixes.class.getClassLoader().getResourceAsStream(RESOURCE_NAME); |
| if (result == null) { |
| result = ClassLoader.getSystemResourceAsStream(RESOURCE_NAME); |
| } |
| } |
| return result; |
| } |
| |
| |
| } |