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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       */
getAll()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       */
get()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       */
size()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       */
getID()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       */
contains(Object attrVal)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       */
add(Object attrVal)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       */
remove(Object attrval)173     boolean remove(Object attrval);
174 
175     /**
176       * Removes all values from this attribute.
177       */
clear()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 
getAttributeSyntaxDefinition()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       */
getAttributeDefinition()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       */
clone()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       */
isOrdered()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      * {@code 0 <= ix < size()}.
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      */
get(int ix)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      * {@code 0 <= ix < size()}.
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      */
remove(int ix)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      * {@code 0 <= ix <= size()}.
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      */
add(int ix, Object attrVal)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      * {@code 0 <= ix < size()}.
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      */
set(int ix, Object attrVal)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 }
341