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17 package org.apache.commons.feedparser;
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19 import java.util.Locale;
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21 import org.apache.commons.feedparser.tools.RFC3066LocaleParser;
22 import org.jaxen.jdom.JDOMXPath;
23 import org.jdom.Attribute;
24 import org.jdom.Element;
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32 public class BaseParser {
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34 protected static void doLocale( FeedParserState state,
35 FeedParserListener listener,
36 Element element ) throws Exception {
37
38 if ( element == null )
39 return;
40
41 if ( state.metaFeedParserlistener == null )
42 return;
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44 String l = getLocaleString( element );
45
46 if ( l != null ) {
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48 Locale locale = RFC3066LocaleParser.parse( l );
49
50 if ( locale != null )
51 state.metaFeedParserlistener.onLocale( state, locale );
52
53 }
54
55 }
56
57 protected static void doLocaleEnd( FeedParserState state,
58 FeedParserListener listener,
59 Element element )
60 throws Exception {
61
62 if ( element == null )
63 return;
64
65 if ( state.metaFeedParserlistener == null )
66 return;
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68 String l = getLocaleString( element );
69
70 if ( l != null )
71 state.metaFeedParserlistener.onLocaleEnd();
72
73 }
74
75 protected static String getLocaleString( Element element ) {
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78 Attribute attr = element.getAttribute( "lang" );
79
80 if ( attr != null )
81 return attr.getValue();
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85 Element lang = element.getChild( "language", NS.DC );
86
87 if ( lang != null )
88 return lang.getText();
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92 lang = element.getChild( "language" );
93
94 if ( lang != null )
95 return lang.getText();
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97 return null;
98
99 }
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104 protected static String selectText( String query, Element element ) throws Exception {
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106 JDOMXPath xpath = new JDOMXPath( query );
107 xpath.setNamespaceContext( NS.context );
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110 Element e = (Element)xpath.selectSingleNode( element );
111
112 if ( e == null )
113 return null;
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115 String result = e.getText();
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117
118
119 if ( result != null )
120 result = result.trim();
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122 return result;
123
124 }
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131 protected static String getChildElementTextByName( FeedParserState state,
132 String name ) throws Exception {
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136 JDOMXPath xpath = new JDOMXPath( "descendant::*[local-name() = '" + name + "']" );
137 Object resultNode = xpath.selectSingleNode( state.current );
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139 String resultText = null;
140
141 if ( resultNode != null )
142 resultText = ((Element)resultNode).getText();
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144
145
146 if ( resultText != null )
147 resultText = resultText.trim();
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149 return resultText;
150
151 }
152
153 }