J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003 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.ldap; |
| 27 | |
| 28 | import java.io.IOException; |
| 29 | import com.sun.jndi.ldap.Ber; |
| 30 | import com.sun.jndi.ldap.BerEncoder; |
| 31 | |
| 32 | /** |
| 33 | * Requests that the results of a search operation be sorted by the LDAP server |
| 34 | * before being returned. |
| 35 | * The sort criteria are specified using an ordered list of one or more sort |
| 36 | * keys, with associated sort parameters. |
| 37 | * Search results are sorted at the LDAP server according to the parameters |
| 38 | * supplied in the sort control and then returned to the requestor. If sorting |
| 39 | * is not supported at the server (and the sort control is marked as critical) |
| 40 | * then the search operation is not performed and an error is returned. |
| 41 | * <p> |
| 42 | * The following code sample shows how the class may be used: |
| 43 | * <pre> |
| 44 | * |
| 45 | * // Open an LDAP association |
| 46 | * LdapContext ctx = new InitialLdapContext(); |
| 47 | * |
| 48 | * // Activate sorting |
| 49 | * String sortKey = "cn"; |
| 50 | * ctx.setRequestControls(new Control[]{ |
| 51 | * new SortControl(sortKey, Control.CRITICAL) }); |
| 52 | * |
| 53 | * // Perform a search |
| 54 | * NamingEnumeration results = |
| 55 | * ctx.search("", "(objectclass=*)", new SearchControls()); |
| 56 | * |
| 57 | * // Iterate over search results |
| 58 | * while (results != null && results.hasMore()) { |
| 59 | * // Display an entry |
| 60 | * SearchResult entry = (SearchResult)results.next(); |
| 61 | * System.out.println(entry.getName()); |
| 62 | * System.out.println(entry.getAttributes()); |
| 63 | * |
| 64 | * // Handle the entry's response controls (if any) |
| 65 | * if (entry instanceof HasControls) { |
| 66 | * // ((HasControls)entry).getControls(); |
| 67 | * } |
| 68 | * } |
| 69 | * // Examine the sort control response |
| 70 | * Control[] controls = ctx.getResponseControls(); |
| 71 | * if (controls != null) { |
| 72 | * for (int i = 0; i < controls.length; i++) { |
| 73 | * if (controls[i] instanceof SortResponseControl) { |
| 74 | * SortResponseControl src = (SortResponseControl)controls[i]; |
| 75 | * if (! src.isSorted()) { |
| 76 | * throw src.getException(); |
| 77 | * } |
| 78 | * } else { |
| 79 | * // Handle other response controls (if any) |
| 80 | * } |
| 81 | * } |
| 82 | * } |
| 83 | * |
| 84 | * // Close the LDAP association |
| 85 | * ctx.close(); |
| 86 | * ... |
| 87 | * |
| 88 | * </pre> |
| 89 | * <p> |
| 90 | * This class implements the LDAPv3 Request Control for server-side sorting |
| 91 | * as defined in |
| 92 | * <a href="http://www.ietf.org/rfc/rfc2891.txt">RFC 2891</a>. |
| 93 | * |
| 94 | * The control's value has the following ASN.1 definition: |
| 95 | * <pre> |
| 96 | * |
| 97 | * SortKeyList ::= SEQUENCE OF SEQUENCE { |
| 98 | * attributeType AttributeDescription, |
| 99 | * orderingRule [0] MatchingRuleId OPTIONAL, |
| 100 | * reverseOrder [1] BOOLEAN DEFAULT FALSE } |
| 101 | * |
| 102 | * </pre> |
| 103 | * |
| 104 | * @since 1.5 |
| 105 | * @see SortKey |
| 106 | * @see SortResponseControl |
| 107 | * @author Vincent Ryan |
| 108 | */ |
| 109 | final public class SortControl extends BasicControl { |
| 110 | |
| 111 | /** |
| 112 | * The server-side sort control's assigned object identifier |
| 113 | * is 1.2.840.113556.1.4.473. |
| 114 | */ |
| 115 | public static final String OID = "1.2.840.113556.1.4.473"; |
| 116 | |
| 117 | private static final long serialVersionUID = -1965961680233330744L; |
| 118 | |
| 119 | /** |
| 120 | * Constructs a control to sort on a single attribute in ascending order. |
| 121 | * Sorting will be performed using the ordering matching rule defined |
| 122 | * for use with the specified attribute. |
| 123 | * |
| 124 | * @param sortBy An attribute ID to sort by. |
| 125 | * @param criticality If true then the server must honor the control |
| 126 | * and return the search results sorted as |
| 127 | * requested or refuse to perform the search. |
| 128 | * If false, then the server need not honor the |
| 129 | * control. |
| 130 | * @exception IOException If an error was encountered while encoding the |
| 131 | * supplied arguments into a control. |
| 132 | */ |
| 133 | public SortControl(String sortBy, boolean criticality) throws IOException { |
| 134 | |
| 135 | super(OID, criticality, null); |
| 136 | super.value = setEncodedValue(new SortKey[]{ new SortKey(sortBy) }); |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Constructs a control to sort on a list of attributes in ascending order. |
| 141 | * Sorting will be performed using the ordering matching rule defined |
| 142 | * for use with each of the specified attributes. |
| 143 | * |
| 144 | * @param sortBy A non-null list of attribute IDs to sort by. |
| 145 | * The list is in order of highest to lowest sort key |
| 146 | * precedence. |
| 147 | * @param criticality If true then the server must honor the control |
| 148 | * and return the search results sorted as |
| 149 | * requested or refuse to perform the search. |
| 150 | * If false, then the server need not honor the |
| 151 | * control. |
| 152 | * @exception IOException If an error was encountered while encoding the |
| 153 | * supplied arguments into a control. |
| 154 | */ |
| 155 | public SortControl(String[] sortBy, boolean criticality) |
| 156 | throws IOException { |
| 157 | |
| 158 | super(OID, criticality, null); |
| 159 | SortKey[] sortKeys = new SortKey[sortBy.length]; |
| 160 | for (int i = 0; i < sortBy.length; i++) { |
| 161 | sortKeys[i] = new SortKey(sortBy[i]); |
| 162 | } |
| 163 | super.value = setEncodedValue(sortKeys); |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * Constructs a control to sort on a list of sort keys. |
| 168 | * Each sort key specifies the sort order and ordering matching rule to use. |
| 169 | * |
| 170 | * @param sortBy A non-null list of keys to sort by. |
| 171 | * The list is in order of highest to lowest sort key |
| 172 | * precedence. |
| 173 | * @param criticality If true then the server must honor the control |
| 174 | * and return the search results sorted as |
| 175 | * requested or refuse to perform the search. |
| 176 | * If false, then the server need not honor the |
| 177 | * control. |
| 178 | * @exception IOException If an error was encountered while encoding the |
| 179 | * supplied arguments into a control. |
| 180 | */ |
| 181 | public SortControl(SortKey[] sortBy, boolean criticality) |
| 182 | throws IOException { |
| 183 | |
| 184 | super(OID, criticality, null); |
| 185 | super.value = setEncodedValue(sortBy); |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * Encodes the sort control's value using ASN.1 BER. |
| 190 | * The result includes the BER tag and length for the control's value but |
| 191 | * does not include the control's object identifer and criticality setting. |
| 192 | * |
| 193 | * @param sortKeys A non-null list of keys to sort by. |
| 194 | * @return A possibly null byte array representing the ASN.1 BER encoded |
| 195 | * value of the sort control. |
| 196 | * @exception IOException If a BER encoding error occurs. |
| 197 | */ |
| 198 | private byte[] setEncodedValue(SortKey[] sortKeys) throws IOException { |
| 199 | |
| 200 | // build the ASN.1 BER encoding |
| 201 | BerEncoder ber = new BerEncoder(30 * sortKeys.length + 10); |
| 202 | String matchingRule; |
| 203 | |
| 204 | ber.beginSeq(Ber.ASN_SEQUENCE | Ber.ASN_CONSTRUCTOR); |
| 205 | |
| 206 | for (int i = 0; i < sortKeys.length; i++) { |
| 207 | ber.beginSeq(Ber.ASN_SEQUENCE | Ber.ASN_CONSTRUCTOR); |
| 208 | ber.encodeString(sortKeys[i].getAttributeID(), true); // v3 |
| 209 | |
| 210 | if ((matchingRule = sortKeys[i].getMatchingRuleID()) != null) { |
| 211 | ber.encodeString(matchingRule, (Ber.ASN_CONTEXT | 0), true); |
| 212 | } |
| 213 | if (! sortKeys[i].isAscending()) { |
| 214 | ber.encodeBoolean(true, (Ber.ASN_CONTEXT | 1)); |
| 215 | } |
| 216 | ber.endSeq(); |
| 217 | } |
| 218 | ber.endSeq(); |
| 219 | |
| 220 | return ber.getTrimmedBuf(); |
| 221 | } |
| 222 | } |