1 /*
2 * Copyright 1999-2004 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.naming.directory;
27
28 import java.util.Vector;
29 import java.util.Enumeration;
30 import java.util.NoSuchElementException;
31
32 import javax.naming.NamingException;
33 import javax.naming.NamingEnumeration;
34 import javax.naming.OperationNotSupportedException;
35
36 /**
37 * This interface represents an attribute associated with a named object.
38 *<p>
39 * In a directory, named objects can have associated with them
40 * attributes. The <tt>Attribute</tt> interface represents an attribute associated
41 * with a named object. An attribute contains 0 or more, possibly null, values.
42 * The attribute values can be ordered or unordered (see <tt>isOrdered()</tt>).
43 * If the values are unordered, no duplicates are allowed.
44 * If the values are ordered, duplicates are allowed.
45 *<p>
46 * The content and representation of an attribute and its values is defined by
47 * the attribute's <em>schema</em>. The schema contains information
48 * about the attribute's syntax and other properties about the attribute.
49 * See <tt>getAttributeDefinition()</tt> and
50 * <tt>getAttributeSyntaxDefinition()</tt>
51 * for details regarding how to get schema information about an attribute
52 * if the underlying directory service supports schemas.
53 *<p>
54 * Equality of two attributes is determined by the implementation class.
55 * A simple implementation can use <tt>Object.equals()</tt> to determine equality
56 * of attribute values, while a more sophisticated implementation might
57 * make use of schema information to determine equality.
58 * Similarly, one implementation might provide a static storage
59 * structure which simply returns the values passed to its
60 * constructor, while another implementation might define <tt>get()</tt> and
61 * <tt>getAll()</tt>.
62 * to get the values dynamically from the directory.
63 *<p>
64 * Note that updates to <tt>Attribute</tt> (such as adding or removing a
65 * value) do not affect the corresponding representation of the attribute
66 * in the directory. Updates to the directory can only be effected
67 * using operations in the <tt>DirContext</tt> interface.
68 *
69 * @author Rosanna Lee
70 * @author Scott Seligman
71 *
72 * @see BasicAttribute
73 * @since 1.3
74 */
75 public interface Attribute extends Cloneable, java.io.Serializable {
76 /**
77 * Retrieves an enumeration of the attribute's values.
78 * The behaviour of this enumeration is unspecified
79 * if the attribute's values are added, changed,
80 * or removed while the enumeration is in progress.
81 * If the attribute values are ordered, the enumeration's items
82 * will be ordered.
83 *
84 * @return A non-null enumeration of the attribute's values.
85 * Each element of the enumeration is a possibly null Object. The object's
86 * class is the class of the attribute value. The element is null
87 * if the attribute's value is null.
88 * If the attribute has zero values, an empty enumeration
89 * is returned.
90 * @exception NamingException
91 * If a naming exception was encountered while retrieving
92 * the values.
93 * @see #isOrdered
94 */
95 NamingEnumeration<?> getAll() throws NamingException;
96
97 /**
98 * Retrieves one of this attribute's values.
99 * If the attribute has more than one value and is unordered, any one of
100 * the values is returned.
101 * If the attribute has more than one value and is ordered, the
102 * first value is returned.
103 *
104 * @return A possibly null object representing one of
105 * the attribute's value. It is null if the attribute's value
106 * is null.
107 * @exception NamingException
108 * If a naming exception was encountered while retrieving
109 * the value.
110 * @exception java.util.NoSuchElementException
111 * If this attribute has no values.
112 */
113 Object get() throws NamingException;
114
115 /**
116 * Retrieves the number of values in this attribute.
117 *
118 * @return The nonnegative number of values in this attribute.
119 */
120 int size();
121
122 /**
123 * Retrieves the id of this attribute.
124 *
125 * @return The id of this attribute. It cannot be null.
126 */
127 String getID();
128
129 /**
130 * Determines whether a value is in the attribute.
131 * Equality is determined by the implementation, which may use
132 * <tt>Object.equals()</tt> or schema information to determine equality.
133 *
134 * @param attrVal The possibly null value to check. If null, check
135 * whether the attribute has an attribute value whose value is null.
136 * @return true if attrVal is one of this attribute's values; false otherwise.
137 * @see java.lang.Object#equals
138 * @see BasicAttribute#equals
139 */
140 boolean contains(Object attrVal);
141 /**
142 * Adds a new value to the attribute.
143 * If the attribute values are unordered and
144 * <tt>attrVal</tt> is already in the attribute, this method does nothing.
145 * If the attribute values are ordered, <tt>attrVal</tt> is added to the end of
146 * the list of attribute values.
147 *<p>
148 * Equality is determined by the implementation, which may use
149 * <tt>Object.equals()</tt> or schema information to determine equality.
150 *
151 * @param attrVal The new possibly null value to add. If null, null
152 * is added as an attribute value.
153 * @return true if a value was added; false otherwise.
154 */
155 boolean add(Object attrVal);
156
157 /**
158 * Removes a specified value from the attribute.
159 * If <tt>attrval</tt> is not in the attribute, this method does nothing.
160 * If the attribute values are ordered, the first occurrence of
161 * <tt>attrVal</tt> is removed and attribute values at indices greater
162 * than the removed
163 * value are shifted up towards the head of the list (and their indices
164 * decremented by one).
165 *<p>
166 * Equality is determined by the implementation, which may use
167 * <tt>Object.equals()</tt> or schema information to determine equality.
168 *
169 * @param attrval The possibly null value to remove from this attribute.
170 * If null, remove the attribute value that is null.
171 * @return true if the value was removed; false otherwise.
172 */
173 boolean remove(Object attrval);
174
175 /**
176 * Removes all values from this attribute.
177 */
178 void clear();
179
180 /**
181 * Retrieves the syntax definition associated with the attribute.
182 * An attribute's syntax definition specifies the format
183 * of the attribute's value(s). Note that this is different from
184 * the attribute value's representation as a Java object. Syntax
185 * definition refers to the directory's notion of <em>syntax</em>.
186 *<p>
187 * For example, even though a value might be
188 * a Java String object, its directory syntax might be "Printable String"
189 * or "Telephone Number". Or a value might be a byte array, and its
190 * directory syntax is "JPEG" or "Certificate".
191 * For example, if this attribute's syntax is "JPEG",
192 * this method would return the syntax definition for "JPEG".
193 * <p>
194 * The information that you can retrieve from a syntax definition
195 * is directory-dependent.
196 *<p>
197 * If an implementation does not support schemas, it should throw
198 * OperationNotSupportedException. If an implementation does support
199 * schemas, it should define this method to return the appropriate
200 * information.
201 * @return The attribute's syntax definition. Null if the implementation
202 * supports schemas but this particular attribute does not have
203 * any schema information.
204 * @exception OperationNotSupportedException If getting the schema
205 * is not supported.
206 * @exception NamingException If a naming exception occurs while getting
207 * the schema.
208 */
209
210 DirContext getAttributeSyntaxDefinition() throws NamingException;
211
212 /**
213 * Retrieves the attribute's schema definition.
214 * An attribute's schema definition contains information
215 * such as whether the attribute is multivalued or single-valued,
216 * the matching rules to use when comparing the attribute's values.
217 *
218 * The information that you can retrieve from an attribute definition
219 * is directory-dependent.
220 *
221 *<p>
222 * If an implementation does not support schemas, it should throw
223 * OperationNotSupportedException. If an implementation does support
224 * schemas, it should define this method to return the appropriate
225 * information.
226 * @return This attribute's schema definition. Null if the implementation
227 * supports schemas but this particular attribute does not have
228 * any schema information.
229 * @exception OperationNotSupportedException If getting the schema
230 * is not supported.
231 * @exception NamingException If a naming exception occurs while getting
232 * the schema.
233 */
234 DirContext getAttributeDefinition() throws NamingException;
235
236 /**
237 * Makes a copy of the attribute.
238 * The copy contains the same attribute values as the original attribute:
239 * the attribute values are not themselves cloned.
240 * Changes to the copy will not affect the original and vice versa.
241 *
242 * @return A non-null copy of the attribute.
243 */
244 Object clone();
245
246 //----------- Methods to support ordered multivalued attributes
247
248 /**
249 * Determines whether this attribute's values are ordered.
250 * If an attribute's values are ordered, duplicate values are allowed.
251 * If an attribute's values are unordered, they are presented
252 * in any order and there are no duplicate values.
253 * @return true if this attribute's values are ordered; false otherwise.
254 * @see #get(int)
255 * @see #remove(int)
256 * @see #add(int, java.lang.Object)
257 * @see #set(int, java.lang.Object)
258 */
259 boolean isOrdered();
260
261 /**
262 * Retrieves the attribute value from the ordered list of attribute values.
263 * This method returns the value at the <tt>ix</tt> index of the list of
264 * attribute values.
265 * If the attribute values are unordered,
266 * this method returns the value that happens to be at that index.
267 * @param ix The index of the value in the ordered list of attribute values.
268 * 0 <= <tt>ix</tt> < <tt>size()</tt>.
269 * @return The possibly null attribute value at index <tt>ix</tt>;
270 * null if the attribute value is null.
271 * @exception NamingException If a naming exception was encountered while
272 * retrieving the value.
273 * @exception IndexOutOfBoundsException If <tt>ix</tt> is outside the specified range.
274 */
275 Object get(int ix) throws NamingException;
276
277 /**
278 * Removes an attribute value from the ordered list of attribute values.
279 * This method removes the value at the <tt>ix</tt> index of the list of
280 * attribute values.
281 * If the attribute values are unordered,
282 * this method removes the value that happens to be at that index.
283 * Values located at indices greater than <tt>ix</tt> are shifted up towards
284 * the front of the list (and their indices decremented by one).
285 *
286 * @param ix The index of the value to remove.
287 * 0 <= <tt>ix</tt> < <tt>size()</tt>.
288 * @return The possibly null attribute value at index <tt>ix</tt> that was removed;
289 * null if the attribute value is null.
290 * @exception IndexOutOfBoundsException If <tt>ix</tt> is outside the specified range.
291 */
292 Object remove(int ix);
293
294 /**
295 * Adds an attribute value to the ordered list of attribute values.
296 * This method adds <tt>attrVal</tt> to the list of attribute values at
297 * index <tt>ix</tt>.
298 * Values located at indices at or greater than <tt>ix</tt> are
299 * shifted down towards the end of the list (and their indices incremented
300 * by one).
301 * If the attribute values are unordered and already have <tt>attrVal</tt>,
302 * <tt>IllegalStateException</tt> is thrown.
303 *
304 * @param ix The index in the ordered list of attribute values to add the new value.
305 * 0 <= <tt>ix</tt> <= <tt>size()</tt>.
306 * @param attrVal The possibly null attribute value to add; if null, null is
307 * the value added.
308 * @exception IndexOutOfBoundsException If <tt>ix</tt> is outside the specified range.
309 * @exception IllegalStateException If the attribute values are unordered and
310 * <tt>attrVal</tt> is one of those values.
311 */
312 void add(int ix, Object attrVal);
313
314
315 /**
316 * Sets an attribute value in the ordered list of attribute values.
317 * This method sets the value at the <tt>ix</tt> index of the list of
318 * attribute values to be <tt>attrVal</tt>. The old value is removed.
319 * If the attribute values are unordered,
320 * this method sets the value that happens to be at that index
321 * to <tt>attrVal</tt>, unless <tt>attrVal</tt> is already one of the values.
322 * In that case, <tt>IllegalStateException</tt> is thrown.
323 *
324 * @param ix The index of the value in the ordered list of attribute values.
325 * 0 <= <tt>ix</tt> < <tt>size()</tt>.
326 * @param attrVal The possibly null attribute value to use.
327 * If null, 'null' replaces the old value.
328 * @return The possibly null attribute value at index ix that was replaced.
329 * Null if the attribute value was null.
330 * @exception IndexOutOfBoundsException If <tt>ix</tt> is outside the specified range.
331 * @exception IllegalStateException If <tt>attrVal</tt> already exists and the
332 * attribute values are unordered.
333 */
334 Object set(int ix, Object attrVal);
335
336 /**
337 * Use serialVersionUID from JNDI 1.1.1 for interoperability.
338 */
339 static final long serialVersionUID = 8707690322213556804L;
340 }
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