1 /*
2 * Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package javax.xml.transform.sax;
27
28 import javax.xml.transform.Source;
29 import javax.xml.transform.stream.StreamSource;
30
31 import org.xml.sax.InputSource;
32 import org.xml.sax.XMLReader;
33
34 /**
35 * <p>Acts as an holder for SAX-style Source.</p>
36 *
37 * <p>Note that XSLT requires namespace support. Attempting to transform an
38 * input source that is not
39 * generated with a namespace-aware parser may result in errors.
40 * Parsers can be made namespace aware by calling the
41 * {@link javax.xml.parsers.SAXParserFactory#setNamespaceAware(boolean awareness)} method.</p>
42 *
43 * @author <a href="mailto:Jeff.Suttor@Sun.com">Jeff Suttor</a>
44 */
45 public class SAXSource implements Source {
46
47 /**
48 * If {@link javax.xml.transform.TransformerFactory#getFeature}
49 * returns true when passed this value as an argument,
50 * the Transformer supports Source input of this type.
51 */
52 public static final String FEATURE =
53 "http://javax.xml.transform.sax.SAXSource/feature";
54
55 /**
56 * <p>Zero-argument default constructor. If this constructor is used, and
57 * no SAX source is set using
58 * {@link #setInputSource(InputSource inputSource)} , then the
59 * <code>Transformer</code> will
60 * create an empty source {@link org.xml.sax.InputSource} using
61 * {@link org.xml.sax.InputSource#InputSource() new InputSource()}.</p>
62 *
63 * @see javax.xml.transform.Transformer#transform(Source xmlSource, Result outputTarget)
64 */
65 public SAXSource() { }
66
67 /**
68 * Create a <code>SAXSource</code>, using an {@link org.xml.sax.XMLReader}
69 * and a SAX InputSource. The {@link javax.xml.transform.Transformer}
70 * or {@link javax.xml.transform.sax.SAXTransformerFactory} will set itself
71 * to be the reader's {@link org.xml.sax.ContentHandler}, and then will call
72 * reader.parse(inputSource).
73 *
74 * @param reader An XMLReader to be used for the parse.
75 * @param inputSource A SAX input source reference that must be non-null
76 * and that will be passed to the reader parse method.
77 */
78 public SAXSource(XMLReader reader, InputSource inputSource) {
79 this.reader = reader;
80 this.inputSource = inputSource;
81 }
82
83 /**
84 * Create a <code>SAXSource</code>, using a SAX <code>InputSource</code>.
85 * The {@link javax.xml.transform.Transformer} or
86 * {@link javax.xml.transform.sax.SAXTransformerFactory} creates a
87 * reader via {@link org.xml.sax.helpers.XMLReaderFactory}
88 * (if setXMLReader is not used), sets itself as
89 * the reader's {@link org.xml.sax.ContentHandler}, and calls
90 * reader.parse(inputSource).
91 *
92 * @param inputSource An input source reference that must be non-null
93 * and that will be passed to the parse method of the reader.
94 */
95 public SAXSource(InputSource inputSource) {
96 this.inputSource = inputSource;
97 }
98
99 /**
100 * Set the XMLReader to be used for the Source.
101 *
102 * @param reader A valid XMLReader or XMLFilter reference.
103 */
104 public void setXMLReader(XMLReader reader) {
105 this.reader = reader;
106 }
107
108 /**
109 * Get the XMLReader to be used for the Source.
110 *
111 * @return A valid XMLReader or XMLFilter reference, or null.
112 */
113 public XMLReader getXMLReader() {
114 return reader;
115 }
116
117 /**
118 * Set the SAX InputSource to be used for the Source.
119 *
120 * @param inputSource A valid InputSource reference.
121 */
122 public void setInputSource(InputSource inputSource) {
123 this.inputSource = inputSource;
124 }
125
126 /**
127 * Get the SAX InputSource to be used for the Source.
128 *
129 * @return A valid InputSource reference, or null.
130 */
131 public InputSource getInputSource() {
132 return inputSource;
133 }
134
135 /**
136 * Set the system identifier for this Source. If an input source
137 * has already been set, it will set the system ID or that
138 * input source, otherwise it will create a new input source.
139 *
140 * <p>The system identifier is optional if there is a byte stream
141 * or a character stream, but it is still useful to provide one,
142 * since the application can use it to resolve relative URIs
143 * and can include it in error messages and warnings (the parser
144 * will attempt to open a connection to the URI only if
145 * no byte stream or character stream is specified).</p>
146 *
147 * @param systemId The system identifier as a URI string.
148 */
149 public void setSystemId(String systemId) {
150
151 if (null == inputSource) {
152 inputSource = new InputSource(systemId);
153 } else {
154 inputSource.setSystemId(systemId);
155 }
156 }
157
158 /**
159 * <p>Get the base ID (URI or system ID) from where URIs
160 * will be resolved.</p>
161 *
162 * @return Base URL for the <code>Source</code>, or <code>null</code>.
163 */
164 public String getSystemId() {
165
166 if (inputSource == null) {
167 return null;
168 } else {
169 return inputSource.getSystemId();
170 }
171 }
172
173 /**
174 * The XMLReader to be used for the source tree input. May be null.
175 */
176 private XMLReader reader;
177
178 /**
179 * <p>The SAX InputSource to be used for the source tree input.
180 * Should not be <code>null</code>.</p>
181 */
182 private InputSource inputSource;
183
184 /**
185 * Attempt to obtain a SAX InputSource object from a Source
186 * object.
187 *
188 * @param source Must be a non-null Source reference.
189 *
190 * @return An InputSource, or null if Source can not be converted.
191 */
192 public static InputSource sourceToInputSource(Source source) {
193
194 if (source instanceof SAXSource) {
195 return ((SAXSource) source).getInputSource();
196 } else if (source instanceof StreamSource) {
197 StreamSource ss = (StreamSource) source;
198 InputSource isource = new InputSource(ss.getSystemId());
199
200 isource.setByteStream(ss.getInputStream());
201 isource.setCharacterStream(ss.getReader());
202 isource.setPublicId(ss.getPublicId());
203
204 return isource;
205 } else {
206 return null;
207 }
208 }
209 }
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