Deleting an Entry 149 in Java

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Deleting an Entry 149
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// Done, so disconnect if ( (ld != null) && ldisConnected() ) { try { lddisconnect(); } catch ( LDAPException e ) { Systemoutprintln( etoString() ); } } Systemexit(0); }
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In the next block of code, we rst determine if any entries are under the one being deleted We use a search scope of LDAPConnectionSCOPE_ONE We are requesting no attributes from the search because the only data we are interested in is the DNs of the entries we nd If there are any entries, we recursively call ourselves with the DNs of those entries to check the next level If there are no entries, then we delete the entry using the standard LDAPConnectiondelete method
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/** * Delete an entry, recursing if the entry has children * * @param dn DN of the entry to delete * @param ld active connection to server * @param doDelete true if the entries really * are to be deleted */ public static void delete( String dn, LDAPConnection ld, boolean doDelete ) { String theDN = "";
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try { LDAPSearchConstraints cons = ldgetSearchConstraints(); // Retrieve all results at once conssetBatchSize( 0 );
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// Find all immediate child nodes; return no // attributes LDAPSearchResults res = ldsearch( dn, ldSCOPE_ONE,
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"objectclass=*", new String[] {LDAPv3NO_ATTRS}, false, cons ); // Recurse on entries under this entry while ( reshasMoreElements() ) { try { // Next directory entry LDAPEntry entry = resnext(); theDN = entrygetDN(); // Recurse down delete( theDN, ld, doDelete ); } catch ( LDAPReferralException e ) { // Do not follow referrals; just list them Systemoutprintln( "Search reference: " ); LDAPUrl refUrls[] = egetURLs(); for ( int i = 0; i < refUrlslength; i++ ) { Systemoutprintln( " " + refUrls[i]getUrl() ); } continue; } catch ( LDAPException e ) { Systemoutprintln( etoString() ); continue; } } // At this point, the DN represents a leaf node, // so stop recursing and delete the node try { if ( doDelete ) { lddelete( dn ); Systemoutprintln( dn + " deleted" ); } else { Systemoutprintln( dn + " would be deleted" ); } } catch (LDAPException e) { Systemoutprintln( etoString() ); }
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Renaming an Entry: Modifying the RDN 151
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} catch( LDAPException e ) { Systemoutprintln( etoString() ); } return; } }
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The CD-ROM that accompanies this book includes an LDIF le that you can import into the directory to test the branch deletion code Import the le branchdeleteldif using the following command:
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java LDAPModify -D "cn=directory manager" -w password -c -a -f branchdeleteldif
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This le will create a new ou entry called People2 and place entries underneath it, including another ou entry Execute BranchDelete by typing the following:
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java BranchDelete localhost 389 "ou=People2,o=airiuscom" "cn=Directory Manager" "password" N
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The N means you do not wish the deletions to be performed, but instead you want the entries that would be deleted to be displayed When you are ready to try the actual deletion, reissue the command with the YES option instead The preceding block of code provides a generic library routine for universal deletions It is not transactional, though, because LDAP does not support transactions or subtree deletions as a single operation You may have permission to delete some entries in a subtree but not others, in which case BranchDelete will fail midway through the subtree deletion
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Renaming an Entry: Modifying the RDN
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Renaming an entry means changing the relative distinguished name (RDN) of the entry Suppose you would like to rename an entry with the DN uid=bjensen, ou= People, o=airiuscom to have the DN uid=babsjensen, ou=People, o=airiuscom The RDN of the entry is uid=bjensen The LDAPConnectionrename method invokes the LDAP operation to change the RDN of the entry There are four forms of the rename method We will look at two of these forms:
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public void rename(String DN, String newRDN, boolean deleteOldRDN) throws LDAPException
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public void rename(String DN, String newRDN, String newParentDN, boolean deleteOldRDN) throws LDAPException
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The rst form of the rename method is for altering the RDN without moving the entry to a different branch node in the directory tree The best way to understand how the rename operation works is to look at an entry before and after a rename has been issued The entry in Figure 6-5 is one on which we wish to perform a rename A small Java program (RenameRDNjava) to test the LDAPConnectionrename method is provided on the CD-ROM that accompanies this book This program takes some simple arguments and passes them directly to the rename method after setting up a connection to the directory We will use it in the following examples Let s rename bjensen to babsjensen and not delete the old RDN Execute the following command:
java RenameRDN localhost 389 "uid=bjensen,ou=People,o=airiuscom" "uid=babsjensen" "cn=Directory Manager" "password" N
The new record for Babs Jensen looks like Figure 6-6 Note (1) that the DN is now uid=babsjensen, ou=People, o=airiuscom and (2) that because we requested the rename operation not to delete the old RDN, there are two values for the uid attribute (the old value bjensen and the new value babsjensen ) Let s execute the command again on the original record and specify true for the deleteoldRDN parameter:
java RenameRDN localhost 389 "uid=bjensen,ou=People,o=airiuscom" "uid=babsjensen" "cn=Directory Manager" "password" Y
Figure 6-7 shows the result The DN has been changed as in the previous example, and the uid eld contains only the new value This is the expected result of a rename operation and is the form that is most commonly used