1 /*
2 * Copyright 2000-2005 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 // Attributes.java - attribute list with Namespace support
27 // http://www.saxproject.org
28 // Written by David Megginson
29 // NO WARRANTY! This class is in the public domain.
30 // $Id: Attributes.java,v 1.2 2004/11/03 22:44:51 jsuttor Exp $
31
32 package org.xml.sax;
33
34
35 /**
36 * Interface for a list of XML attributes.
37 *
38 * <blockquote>
39 * <em>This module, both source code and documentation, is in the
40 * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
41 * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
42 * for further information.
43 * </blockquote>
44 *
45 * <p>This interface allows access to a list of attributes in
46 * three different ways:</p>
47 *
48 * <ol>
49 * <li>by attribute index;</li>
50 * <li>by Namespace-qualified name; or</li>
51 * <li>by qualified (prefixed) name.</li>
52 * </ol>
53 *
54 * <p>The list will not contain attributes that were declared
55 * #IMPLIED but not specified in the start tag. It will also not
56 * contain attributes used as Namespace declarations (xmlns*) unless
57 * the <code>http://xml.org/sax/features/namespace-prefixes</code>
58 * feature is set to <var>true</var> (it is <var>false</var> by
59 * default).
60 * Because SAX2 conforms to the original "Namespaces in XML"
61 * recommendation, it normally does not
62 * give namespace declaration attributes a namespace URI.
63 * </p>
64 *
65 * <p>Some SAX2 parsers may support using an optional feature flag
66 * (<code>http://xml.org/sax/features/xmlns-uris</code>) to request
67 * that those attributes be given URIs, conforming to a later
68 * backwards-incompatible revision of that recommendation. (The
69 * attribute's "local name" will be the prefix, or "xmlns" when
70 * defining a default element namespace.) For portability, handler
71 * code should always resolve that conflict, rather than requiring
72 * parsers that can change the setting of that feature flag. </p>
73 *
74 * <p>If the namespace-prefixes feature (see above) is
75 * <var>false</var>, access by qualified name may not be available; if
76 * the <code>http://xml.org/sax/features/namespaces</code> feature is
77 * <var>false</var>, access by Namespace-qualified names may not be
78 * available.</p>
79 *
80 * <p>This interface replaces the now-deprecated SAX1 {@link
81 * org.xml.sax.AttributeList AttributeList} interface, which does not
82 * contain Namespace support. In addition to Namespace support, it
83 * adds the <var>getIndex</var> methods (below).</p>
84 *
85 * <p>The order of attributes in the list is unspecified, and will
86 * vary from implementation to implementation.</p>
87 *
88 * @since SAX 2.0
89 * @author David Megginson
90 * @see org.xml.sax.helpers.AttributesImpl
91 * @see org.xml.sax.ext.DeclHandler#attributeDecl
92 */
93 public interface Attributes
94 {
95
96
97 ////////////////////////////////////////////////////////////////////
98 // Indexed access.
99 ////////////////////////////////////////////////////////////////////
100
101
102 /**
103 * Return the number of attributes in the list.
104 *
105 * <p>Once you know the number of attributes, you can iterate
106 * through the list.</p>
107 *
108 * @return The number of attributes in the list.
109 * @see #getURI(int)
110 * @see #getLocalName(int)
111 * @see #getQName(int)
112 * @see #getType(int)
113 * @see #getValue(int)
114 */
115 public abstract int getLength ();
116
117
118 /**
119 * Look up an attribute's Namespace URI by index.
120 *
121 * @param index The attribute index (zero-based).
122 * @return The Namespace URI, or the empty string if none
123 * is available, or null if the index is out of
124 * range.
125 * @see #getLength
126 */
127 public abstract String getURI (int index);
128
129
130 /**
131 * Look up an attribute's local name by index.
132 *
133 * @param index The attribute index (zero-based).
134 * @return The local name, or the empty string if Namespace
135 * processing is not being performed, or null
136 * if the index is out of range.
137 * @see #getLength
138 */
139 public abstract String getLocalName (int index);
140
141
142 /**
143 * Look up an attribute's XML qualified (prefixed) name by index.
144 *
145 * @param index The attribute index (zero-based).
146 * @return The XML qualified name, or the empty string
147 * if none is available, or null if the index
148 * is out of range.
149 * @see #getLength
150 */
151 public abstract String getQName (int index);
152
153
154 /**
155 * Look up an attribute's type by index.
156 *
157 * <p>The attribute type is one of the strings "CDATA", "ID",
158 * "IDREF", "IDREFS", "NMTOKEN", "NMTOKENS", "ENTITY", "ENTITIES",
159 * or "NOTATION" (always in upper case).</p>
160 *
161 * <p>If the parser has not read a declaration for the attribute,
162 * or if the parser does not report attribute types, then it must
163 * return the value "CDATA" as stated in the XML 1.0 Recommendation
164 * (clause 3.3.3, "Attribute-Value Normalization").</p>
165 *
166 * <p>For an enumerated attribute that is not a notation, the
167 * parser will report the type as "NMTOKEN".</p>
168 *
169 * @param index The attribute index (zero-based).
170 * @return The attribute's type as a string, or null if the
171 * index is out of range.
172 * @see #getLength
173 */
174 public abstract String getType (int index);
175
176
177 /**
178 * Look up an attribute's value by index.
179 *
180 * <p>If the attribute value is a list of tokens (IDREFS,
181 * ENTITIES, or NMTOKENS), the tokens will be concatenated
182 * into a single string with each token separated by a
183 * single space.</p>
184 *
185 * @param index The attribute index (zero-based).
186 * @return The attribute's value as a string, or null if the
187 * index is out of range.
188 * @see #getLength
189 */
190 public abstract String getValue (int index);
191
192
193
194 ////////////////////////////////////////////////////////////////////
195 // Name-based query.
196 ////////////////////////////////////////////////////////////////////
197
198
199 /**
200 * Look up the index of an attribute by Namespace name.
201 *
202 * @param uri The Namespace URI, or the empty string if
203 * the name has no Namespace URI.
204 * @param localName The attribute's local name.
205 * @return The index of the attribute, or -1 if it does not
206 * appear in the list.
207 */
208 public int getIndex (String uri, String localName);
209
210
211 /**
212 * Look up the index of an attribute by XML qualified (prefixed) name.
213 *
214 * @param qName The qualified (prefixed) name.
215 * @return The index of the attribute, or -1 if it does not
216 * appear in the list.
217 */
218 public int getIndex (String qName);
219
220
221 /**
222 * Look up an attribute's type by Namespace name.
223 *
224 * <p>See {@link #getType(int) getType(int)} for a description
225 * of the possible types.</p>
226 *
227 * @param uri The Namespace URI, or the empty String if the
228 * name has no Namespace URI.
229 * @param localName The local name of the attribute.
230 * @return The attribute type as a string, or null if the
231 * attribute is not in the list or if Namespace
232 * processing is not being performed.
233 */
234 public abstract String getType (String uri, String localName);
235
236
237 /**
238 * Look up an attribute's type by XML qualified (prefixed) name.
239 *
240 * <p>See {@link #getType(int) getType(int)} for a description
241 * of the possible types.</p>
242 *
243 * @param qName The XML qualified name.
244 * @return The attribute type as a string, or null if the
245 * attribute is not in the list or if qualified names
246 * are not available.
247 */
248 public abstract String getType (String qName);
249
250
251 /**
252 * Look up an attribute's value by Namespace name.
253 *
254 * <p>See {@link #getValue(int) getValue(int)} for a description
255 * of the possible values.</p>
256 *
257 * @param uri The Namespace URI, or the empty String if the
258 * name has no Namespace URI.
259 * @param localName The local name of the attribute.
260 * @return The attribute value as a string, or null if the
261 * attribute is not in the list.
262 */
263 public abstract String getValue (String uri, String localName);
264
265
266 /**
267 * Look up an attribute's value by XML qualified (prefixed) name.
268 *
269 * <p>See {@link #getValue(int) getValue(int)} for a description
270 * of the possible values.</p>
271 *
272 * @param qName The XML qualified name.
273 * @return The attribute value as a string, or null if the
274 * attribute is not in the list or if qualified names
275 * are not available.
276 */
277 public abstract String getValue (String qName);
278
279 }
280
281 // end of Attributes.java
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