J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 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 | } |