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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, 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  }