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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,
35          BNODE
36      }
37  
38      /**
39       * Instance subject type.
40       */
41      private final Type type;
42  
43      /**
44       * Constructor.
45       *
46       * @param type subject type.
47       * @param value internal value.
48       * @param isVar if <code>true</code> it the given <code>value</code>
49       *              will be resolved with the variable value.
50       */
51      public TemplateSubject(Type type, String value, boolean isVar) {
52          super(value, isVar);
53          if (type == null) {
54              throw new NullPointerException("object type cannot be null.");
55          }
56          this.type = type;
57      }
58  
59      @Override
60      protected Resource getValueInternal(String value) {
61          switch (type) {
62              case URI:
63                  return SimpleValueFactory.getInstance().createIRI(value);
64              case BNODE:
65                  return SimpleValueFactory.getInstance().createBNode(value);
66              default:
67                  throw new IllegalStateException();
68          }
69      }
70  
71      @Override
72      public String toString() {
73          final String superStr = super.toString();
74          switch (type) {
75              case URI:
76                  return "<" + superStr + ">";
77              case BNODE:
78                  return "_:" + superStr;
79              default:
80                  throw new IllegalStateException();
81          }
82      }
83  
84  }