1 /* 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * 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 {@code Attribute} 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 {@code isOrdered()}). 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 {@code getAttributeDefinition()} and 50 * {@code getAttributeSyntaxDefinition()} 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 {@code Object.equals()} 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 {@code get()} and 61 * {@code getAll()}. 62 * to get the values dynamically from the directory. 63 *<p> 64 * Note that updates to {@code Attribute} (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 {@code DirContext} 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 * {@code Object.equals()} 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 * {@code attrVal} is already in the attribute, this method does nothing. 145 * If the attribute values are ordered, {@code attrVal} 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 * {@code Object.equals()} 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 {@code attrval} is not in the attribute, this method does nothing. 160 * If the attribute values are ordered, the first occurrence of 161 * {@code attrVal} 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 * {@code Object.equals()} 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 {@code ix} 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 {@code ix}; 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 {@code ix} 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 {@code ix} 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 {@code ix} 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 {@code ix} that was removed; 289 * null if the attribute value is null. 290 * @exception IndexOutOfBoundsException If {@code ix} 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 {@code attrVal} to the list of attribute values at 297 * index {@code ix}. 298 * Values located at indices at or greater than {@code ix} 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 {@code attrVal}, 302 * {@code IllegalStateException} 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 {@code ix} is outside the specified range. 309 * @exception IllegalStateException If the attribute values are unordered and 310 * {@code attrVal} 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 {@code ix} index of the list of 318 * attribute values to be {@code attrVal}. 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 {@code attrVal}, unless {@code attrVal} is already one of the values. 322 * In that case, {@code IllegalStateException} 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 {@code ix} is outside the specified range. 331 * @exception IllegalStateException If {@code attrVal} 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 @SuppressWarnings("serial") // serialVersionUID in an interface is ineffectual 340 static final long serialVersionUID = 8707690322213556804L; 341 }