1 /*
2 * Copyright (c) 2002-2017, Mairie de Paris
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice
10 * and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright notice
13 * and the following disclaimer in the documentation and/or other materials
14 * provided with the distribution.
15 *
16 * 3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 *
32 * License 1.0
33 */
34 package fr.paris.lutece.plugins.googleapi.service;
35
36 import fr.paris.lutece.plugins.googleapi.business.Item;
37
38 import org.xml.sax.Attributes;
39 import org.xml.sax.SAXException;
40 import org.xml.sax.helpers.DefaultHandler;
41
42 import java.util.List;
43 import java.util.Stack;
44
45
46 /**
47 * Simple SAX event handler, which prints out the titles of all entries in the
48 * Atom response feed.
49 */
50 public class FeedHandler extends DefaultHandler
51 {
52 protected List<Item> _listItems;
53
54 /**
55 * Stack containing the opening XML tags of the response.
56 */
57 protected Stack<String> xmlTags = new Stack<String>( );
58
59 /**
60 * True if we are inside of a data entry's title, false otherwise.
61 */
62 protected boolean _bInsideEntryTitle;
63 protected boolean _bInsideEntryContent;
64 protected Item _item;
65
66 /**
67 * Receive notification of an opening XML tag: push the tag to
68 * <code>xmlTags</code>. If the tag is a title tag inside an entry tag,
69 * turn <code>insideEntryTitle</code> to <code>true</code>.
70 * @param listItems
71 */
72 public void setItemList( List<Item> listItems )
73 {
74 _listItems = listItems;
75 }
76
77 /**
78 *
79 * @param uri
80 * @param localName
81 * @param qName
82 * @param attributes
83 * @throws org.xml.sax.SAXException
84 */
85 public void startElement( String uri, String localName, String qName, Attributes attributes )
86 throws SAXException
87 {
88 if ( qName.equals( "title" ) && xmlTags.peek( ).equals( "entry" ) )
89 {
90 _bInsideEntryTitle = true;
91 _item = new Item( );
92 _listItems.add( _item );
93 }
94 else if ( qName.equals( "content" ) && xmlTags.peek( ).equals( "entry" ) )
95 {
96 _bInsideEntryContent = true;
97 }
98 else if ( qName.equals( "link" ) && xmlTags.peek( ).equals( "entry" ) )
99 {
100 if ( attributes.getValue( "rel" ).equals( "alternate" ) )
101 {
102 _item.setLink( attributes.getValue( "href" ) );
103 }
104 }
105 else if ( qName.equals( "media:thumbnail" ) )
106 {
107 _item.setThumbnailUrl( attributes.getValue( "url" ) );
108 }
109
110 xmlTags.push( qName );
111 }
112
113 /**
114 * Receive notification of a closing XML tag: remove the tag from teh stack.
115 * If we were inside of an entry's title, turn <code>insideEntryTitle</code>
116 * to <code>false</code>.
117 * @param uri
118 * @param localName
119 * @param qName
120 * @throws org.xml.sax.SAXException
121 */
122 public void endElement( String uri, String localName, String qName )
123 throws SAXException
124 {
125 // If a "title" element is closed, we start a new line, to prepare
126 // printing the new title.
127 xmlTags.pop( );
128
129 if ( _bInsideEntryTitle )
130 {
131 _bInsideEntryTitle = false;
132 }
133 else if ( _bInsideEntryContent )
134 {
135 _bInsideEntryContent = false;
136 }
137 }
138
139 /**
140 * Callback method for receiving notification of character data inside an
141 * XML element.
142 * @param ch
143 * @param start
144 * @param length
145 * @throws org.xml.sax.SAXException
146 */
147 public void characters( char[] ch, int start, int length )
148 throws SAXException
149 {
150 // display the character data if the opening tag is "title" and its parent is
151 // "entry"
152 if ( _bInsideEntryTitle )
153 {
154 _item.setTitle( new String( ch, start, length ) );
155 }
156 else if ( _bInsideEntryContent )
157 {
158 _item.setContent( new String( ch, start, length ) );
159 }
160 }
161 }