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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
36       *            xpath to this item in container document.
37       */
38      public Item(String xpath) {
39          if (xpath == null) {
40              throw new NullPointerException("xpath cannot be null.");
41          }
42          this.xpath = xpath;
43      }
44  
45      /**
46       * @return the <b>JSON</b> representation for this item.
47       */
48      public abstract String toJSON();
49  
50      /**
51       * @return the item location in container document.
52       */
53      public String getXpath() {
54          return xpath;
55      }
56  
57      @Override
58      public int hashCode() {
59          return xpath.hashCode();
60      }
61  
62      @Override
63      public boolean equals(Object obj) {
64          if (obj == null) {
65              return false;
66          }
67          if (obj == this) {
68              return true;
69          }
70          if (obj instanceof Item) {
71              final Itemf="../../../../../org/apache/any23/extractor/microdata/Item.html#Item">Item other = (Item) obj;
72              return xpath.equals(other.xpath);
73          }
74          return false;
75      }
76  }