FIGURE 12-4 Tree printout from ManagementParser in Java

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FIGURE 12-4 Tree printout from ManagementParser
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390 Modeling Relationships
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/** * Normalize a DN (spacing) * * @param dn String to be normalized * @return a normalized DN String */ static protected String normalizeDN( String dn ) { return new DN( dn )toString()toLowerCase(); }
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The createEntryNode method in the following block of code creates a node from an LDAPEntry The UserObject of a node is a Hashtable that contains various attribute values of the entry If additional attributes are to be tracked and rendered using the nodes, then the fetchAttrs list should be extended and createEntryNode modi ed to store them
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/** * Create a tree node from info in an entry * * @param entry a directory entry with "cn" and optionally * also "title" * @return a tree node */ static protected DefaultMutableTreeNode createEntryNode( LDAPEntry entry ) { String mgr = normalizeDN( getManagerFromEntry( entry ) ); String name = getValueFromEntry( entry, "cn" ); String title = getTitleFromEntry( entry ); String dn = normalizeDN( entrygetDN() ); Hashtable ht = new Hashtable(); if ( name != null ) { htput( "name", name ); } if ( title != null ) { htput( "title", title ); } if ( mgr != null ) { htput( "manager", mgr ); } htput( "dn", dn ); return new DefaultMutableTreeNode( ht ); }
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Attributes as Pointers 391
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In addition, utility methods extract values from an LDAPEntry or from a node:
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/** * Get a single String attribute value from an entry * * @param entry a directory entry * @param name name of the attribute * @return the attribute value, or null if * the attribute is not present */ static protected String getValueFromEntry( LDAPEntry entry, String name ) { // Get the value from the entry LDAPAttribute attr = entrygetAttribute( name ); if ( attr != null ) { Enumeration en = attrgetStringValues(); if ( (en != null) && enhasMoreElements() ) { return (String)ennextElement(); } } return null; } /** * Get a single String attribute value from a node * * @param node a tree node * @param name name of the attribute * @return the attribute value, or null if * the attribute is not present */ static protected String getValueFromNode( DefaultMutableTreeNode node, String name ) { Hashtable nodeEntry = (Hashtable)nodegetUserObject(); if( nodeEntry == null ) { return null; } return (String)nodeEntryget( name ); } /** * Get the DN from a node
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392 Modeling Relationships
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* * @param node a tree node * @return the DN value, or null if * the node doesn t have values */ static protected String getDNFromNode( DefaultMutableTreeNode node ) { return getValueFromNode( node, "dn" ); } /** * Get the manager DN from an entry * * @param entry a directory entry * @return the manager DN value, or null if * the manager attribute is not present */ static protected String getManagerFromEntry( LDAPEntry entry ) { // Get the manager DN from the entry return getValueFromEntry( entry, "manager" ); } /** * Get a title value from an entry * * @param entry a directory entry * @return String to use for title */ static protected String getTitleFromEntry( LDAPEntry entry ) { for( int i = 0; i < _titleAttrslength; i++ ) { String val = getValueFromEntry( entry, _titleAttrs[i] ); if ( val != null ) { return val; } } return _defaultTitle; }
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An Alternative Strategy for Management Parsing
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The CD-ROM that accompanies this book includes an alternative class for parsing the management relationships: ManagementParser2 (see Figure 12-5) It builds the
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Attributes as Pointers 393
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tree of nodes by starting at the top and doing a search at each node for entries that have the node as a manager, rather than doing a single search and then parsing the relationships in memory, as is done in ManagementParser The intention is to demonstrate a top-down, search-as-you-go algorithm ManagementParser2parseTree starts off just as ManagementParser: by creating a table of all top-level nodes Then it searches for all person entries that have a manager attribute, as in ManagementParser, but it keeps only the table of managers and not the table of all employees:
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// Now get all managers Hashtable managerTable = getAllManagers( ldc, base );
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The method getAllManagers is interested in only the manager attribute of each entry:
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// Filter string to retrieve users with a manager private static String _managerFilter = "(&(objectclass=person)(manager=*))";
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ManagementParser2 $ nSearches : int = 0 parseTree(Idc : LDAPConnection, base : String, rootDN : String) : DefaultMutableTreeNode parseTree(Idc : LDAPConnection, base : String) : DefaultMutableTreeNode printTree(root : DefaultMutableTreeNode) : void normalizeDN(dn : String) : String createEntryNode(entry : LDAPEntry) : DefaultMutableTreeNode getRootLevelManagers(Idc : LDAPConnection, base : String, root : DefaultMutableTreeNode) : Hashtable getAllManagers(Idc : LDAPConnection, base : String) : Hashtable addSubordinates(Idc : LDAPConnection, base : String, root : DefaultMutableTreeNode, managerTable : Hashtable) : void getValueFrom Entry(entry : LDAP Entry, name : String) : String getValueFrom Node(node : DefaultMutableTreeNode, name : String) : String getDNFromNode(node : DefaultMutableTreeNode) : String getManagerFromEntry(entry : LDAPEntry) : String getTitleFromEntry(entry : LDAPEntry) : String createManagerFilter(mgr : String) : String printManagers(managers : Hashtable) : void
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