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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.microdata;
19  
20  /**
21   * Base class for <b>Microdata</b> items.
22   *
23   * @author Michele Mostarda (mostarda@fbk.eu)
24   */
25  public abstract class Item {
26  
27      /**
28       * Xpath item location in container document.
29       */
30      private final String xpath;
31  
32      /**
33       * Constructor.
34       *
35       * @param xpath xpath to this item in container document.
36       */
37      public Item(String xpath) {
38          if (xpath == null) {
39              throw new NullPointerException("xpath cannot be null.");
40          }
41          this.xpath = xpath;
42      }
43  
44      /**
45       * @return the <b>JSON</b> representation for this item.
46       */
47      public abstract String toJSON();
48  
49      /**
50       * @return the item location in container document.
51       */
52      public String getXpath() {
53          return xpath;
54      }
55  
56      @Override
57      public int hashCode() {
58          return xpath.hashCode();
59      }
60  
61      @Override
62      public boolean equals(Object obj) {
63          if(obj == null) {
64              return false;
65          }
66          if(obj == this) {
67              return true;
68          }
69          if(obj instanceof Item) {
70              final Itemf="../../../../../org/apache/any23/extractor/microdata/Item.html#Item">Item other = (Item) obj;
71              return xpath.equals( other.xpath );
72          }
73          return false;
74      }
75  }