| /* |
| * 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.tdb2.lib; |
| |
| import static org.apache.jena.tdb2.sys.SystemTDB.LenNodeHash; |
| |
| import java.security.DigestException; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.util.Iterator; |
| |
| import org.apache.jena.atlas.iterator.Iter; |
| import org.apache.jena.atlas.lib.Bytes; |
| import org.apache.jena.atlas.lib.Pool; |
| import org.apache.jena.atlas.lib.PoolBase; |
| import org.apache.jena.atlas.lib.PoolSync; |
| import org.apache.jena.atlas.logging.Log; |
| import org.apache.jena.dboe.base.record.Record; |
| import org.apache.jena.graph.Node; |
| import org.apache.jena.sparql.util.NodeUtils; |
| import org.apache.jena.tdb2.TDBException; |
| import org.apache.jena.tdb2.store.Hash; |
| import org.apache.jena.tdb2.store.NodeId; |
| import org.apache.jena.tdb2.store.NodeIdFactory; |
| import org.apache.jena.tdb2.store.nodetable.NodeTable; |
| |
| public class NodeLib { |
| public static Hash hash(Node n) { |
| Hash h = new Hash(LenNodeHash); |
| setHash(h, n); |
| return h; |
| } |
| |
| private static String BNODE = "bnode"; |
| private static String URI = "uri"; |
| private static String LITERAL = "literal"; |
| |
| public static void setHash(Hash h, Node n) { |
| if ( n.isURI() ) |
| hash(h, n.getURI(), null, null, URI); |
| else if ( n.isBlank() ) |
| hash(h, n.getBlankNodeLabel(), null, null, BNODE); |
| else if ( n.isLiteral() ) { |
| String dt = n.getLiteralDatatypeURI(); |
| if ( NodeUtils.isSimpleString(n) || NodeUtils.isLangString(n) ) { |
| // RDF 1.1 : No datatype for: |
| // xsd:String as simple literals |
| // rdf:langString and @ |
| dt = null; |
| } |
| hash(h, n.getLiteralLexicalForm(), n.getLiteralLanguage(), dt, LITERAL); |
| } else |
| throw new TDBException("Attempt to hash something strange: " + n); |
| } |
| |
| private static int InitialPoolSize = 5; |
| private static Pool<MessageDigest> digesters = PoolSync.create(new PoolBase<MessageDigest>()); |
| static { |
| try { |
| for ( int i = 0; i < InitialPoolSize ; i++ ) |
| digesters.put(MessageDigest.getInstance("MD5")); |
| } |
| catch (NoSuchAlgorithmException e) { |
| Log.warn(NodeLib.class, "NoSuchAlgorithmException", e); |
| throw new RuntimeException(e); |
| } |
| } |
| |
| private static MessageDigest allocDigest() { |
| try { |
| MessageDigest disgest = digesters.get(); |
| if ( disgest == null ) |
| disgest = MessageDigest.getInstance("MD5"); |
| return disgest; |
| } |
| catch (NoSuchAlgorithmException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| private static void deallocDigest(MessageDigest digest) { |
| digest.reset(); |
| digesters.put(digest); |
| } |
| |
| private static void hash(Hash h, String lex, String lang, String datatype, String nodeName) { |
| if ( datatype == null ) |
| datatype = ""; |
| if ( lang == null ) |
| lang = ""; |
| String toHash = lex + "|" + lang + "|" + datatype + "|" + nodeName; |
| MessageDigest digest; |
| try { |
| // MessageDigest.getInstance("MD5"); |
| digest = allocDigest(); |
| digest.update(Bytes.string2bytes(toHash)); |
| if ( h.getLen() == 16 ) { |
| // MD5 is 16 bytes. |
| digest.digest(h.getBytes(), 0, 16); |
| } else { |
| byte b[] = digest.digest(); // 16 bytes. |
| System.arraycopy(b, 0, h.getBytes(), 0, h.getLen()); |
| } |
| deallocDigest(digest); |
| return; |
| } |
| catch (DigestException ex) { |
| Log.error(NodeLib.class, "DigestException", ex); |
| } |
| } |
| |
| public static NodeId getNodeId(Record r, int idx) { |
| return NodeIdFactory.get(r.getKey(), idx); |
| } |
| |
| public static Node termOrAny(Node node) { |
| if ( node == null || node.isVariable() ) |
| return Node.ANY; |
| return node; |
| } |
| |
| public static Iterator<Node> nodes(final NodeTable nodeTable, Iterator<NodeId> iter) { |
| return Iter.map(iter, nodeTable::getNodeForNodeId); |
| } |
| } |