1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.any23.extractor.xpath;
19
20 import org.eclipse.rdf4j.model.Resource;
21 import org.eclipse.rdf4j.model.impl.SimpleValueFactory;
22
23 /**
24 * Represents a <i>Quad</i> subject <i>template</i>.
25 *
26 * @author Michele Mostarda (mostarda@fbk.eu)
27 */
28 public class TemplateSubject extends Term<Resource> {
29
30 /**
31 * Supported subject types.
32 */
33 public enum Type {
34 URI, BNODE
35 }
36
37 /**
38 * Instance subject type.
39 */
40 private final Type type;
41
42 /**
43 * Constructor.
44 *
45 * @param type
46 * subject type.
47 * @param value
48 * internal value.
49 * @param isVar
50 * if <code>true</code> it the given <code>value</code> will be resolved with the variable value.
51 */
52 public TemplateSubject(Type type, String value, boolean isVar) {
53 super(value, isVar);
54 if (type == null) {
55 throw new NullPointerException("object type cannot be null.");
56 }
57 this.type = type;
58 }
59
60 @Override
61 protected Resource getValueInternal(String value) {
62 switch (type) {
63 case URI:
64 return SimpleValueFactory.getInstance().createIRI(value);
65 case BNODE:
66 return SimpleValueFactory.getInstance().createBNode(value);
67 default:
68 throw new IllegalStateException();
69 }
70 }
71
72 @Override
73 public String toString() {
74 final String superStr = super.toString();
75 switch (type) {
76 case URI:
77 return "<" + superStr + ">";
78 case BNODE:
79 return "_:" + superStr;
80 default:
81 throw new IllegalStateException();
82 }
83 }
84
85 }