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1
50
51 package org.apache.avalon.meta;
52
53 import java.io.IOException  ;
54 import java.net.MalformedURLException ;
55 import javax.xml.parsers.ParserConfigurationException ;
56 import javax.xml.parsers.SAXParser ;
57 import javax.xml.parsers.SAXParserFactory ;
58 import org.apache.avalon.framework.configuration.Configuration;
59 import org.apache.avalon.framework.configuration.SAXConfigurationHandler;
60 import org.xml.sax.InputSource ;
61 import org.xml.sax.SAXException ;
62 import org.xml.sax.XMLReader ;
63
64
70 public class ConfigurationBuilder
71 {
72 private static final DTDInfo[] DTD_INFO = new DTDInfo[]
73 {
74 new DTDInfo( "-//AVALON/Component Type DTD Version 1.0//EN",
75 "http://avalon.apache.org/dtds/meta/type_1_0.dtd",
76 "org/apache/avalon/meta/type.dtd" ),
77 new DTDInfo( "-//AVALON/Component Type DTD Version 1.1//EN",
78 "http://avalon.apache.org/dtds/meta/type_1_1.dtd",
79 "org/apache/avalon/meta/type.dtd" ),
80 new DTDInfo( "-//AVALON/Service DTD Version 1.0//EN",
81 "http://avalon.apache.org/dtds/meta/service_1_0.dtd",
82 "org/apache/avalon/meta/service.dtd" ),
83 new DTDInfo( "-//PHOENIX/Block Info DTD Version 1.0//EN",
84 "http://avalon.apache.org/dtds/phoenix/blockinfo_1.0.dtd",
85 "org/apache/avalon/meta/blockinfo.dtd" ),
86 };
87
88 private static final DTDResolver DTD_RESOLVER =
89 new DTDResolver( DTD_INFO, ConfigurationBuilder.class.getClassLoader() );
90
91
94 private ConfigurationBuilder()
95 {
96 }
97
98
101 private static XMLReader createXMLReader()
102 throws SAXException , ParserConfigurationException
103 {
104 final SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
105 saxParserFactory.setNamespaceAware( false );
106 final SAXParser saxParser = saxParserFactory.newSAXParser();
107 return saxParser.getXMLReader();
108 }
109
110
113 private static void setupXMLReader( final XMLReader reader,
114 final SAXConfigurationHandler handler )
115 {
116 reader.setEntityResolver( DTD_RESOLVER );
117 reader.setContentHandler( handler );
118 reader.setErrorHandler( handler );
119 }
120
121
130 public static Configuration build( final String uri )
131 throws SAXException , ParserConfigurationException , IOException
132 {
133 try
134 {
135 return build( new InputSource ( uri ) );
136 }
137 catch( MalformedURLException mue )
138 {
139 final String error =
140 "Invalid input source uri: " + uri;
141 throw new IOException ( error );
142 }
143 }
144
145
154 public static Configuration build( final InputSource input )
155 throws SAXException , ParserConfigurationException , IOException
156 {
157 if( input == null )
158 {
159 throw new NullPointerException ( "input" );
160 }
161
162 final XMLReader reader = createXMLReader();
163 final SAXConfigurationHandler handler = new SAXConfigurationHandler();
164 setupXMLReader( reader, handler );
165 reader.parse( input );
166 return handler.getConfiguration();
167 }
168 }
169 |
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