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Given all that VLV can do, why not use it on every search and page through the results by making repeated calls to the directory The answer is that the VLV Internet Draft de nes the protocol to use but not the server implementation, and LDAP servers generally cannot provide random subsets of search results for an arbitrary query Some servers may have certain prede ned queries that can always be serviced on a VLV search Others including Netscape Directory Server can provide VLV results for any query, but they can do so ef ciently only if a special index exists for the query Netscape Directory Server attempts to sort all search results in memory to return a requested window of entries if no index exists This means that even if you request only ve entries in your VLV control, the server will read all entries of the virtual result list into memory and sort them before returning the ve results If the query results in a virtual list size of more than one or two thousand entries, a lot of memory is used by the server to process the request and the response time degrades If the virtual list size is just a thousand or so entries, we haven t gained much compared to just reading all results and buffering them on the client To allow ef cient browsing of millions of entries, we must create an index for the particular search we are doing The following steps are required with Netscape Directory Server to create a new VLV index: Create a VLV search entry in the directory under cn=config,cn=ldbm The entry de nes the base DN, scope, and search lter of the query Create one or more VLV index entries under the search entry Each entry de nes a sort order for the results Stop the server or make it read-only Run the vlvindex script to generate a new index or indexes Restart the server or make it read/writeable The following is an example of creating an index for a search for any person entry under o=Airiuscom, sorted by last name, rst name.

selfclear() for element in treefindall("incident"): try: data = {} for attribute in ("report_id", "date", "aircraft_id", "aircraft_type", "pilot_percent_hours_on_type", "pilot_total_hours", "midair"): data[attribute] = elementget(attribute) data["date"] = datetimedatetimestrptime( data["date"], "%Y-%m-%d")date() data["pilot_percent_hours_on_type"] = ( float(data["pilot_percent_hours_on_type"])) data["pilot_total_hours"] = int( data["pilot_total_hours"]) data["midair"] = bool(int(data["midair"])) data["airport"] = elementfind("airport")textstrip() narrative = elementfind("narrative")text data["narrative"] = (narrativestrip() if narrative is not None else "") incident = Incident(**data) self[incidentreport_id] = incident except (ValueError, LookupError, IncidentError) as err: print("{0}: import error: {1}"format( ospathbasename(sysargv[0]), err)) return False return True

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Situations where the class of an object is not statically known may lead to runtime type errors In addition, there are situations where the statically known type may not be accurate at run-time Such situations can arise in a program that gives rise to unchecked warnings Such warnings are given in response to operations that cannot be statically guaranteed to be safe, and cannot immediately be subjected to dynamic checking because they involve non-rei able ( 47) types As a result, dynamic checks later in the course of program execution may detect inconsistencies and result in run-time type errors A run-time type error can occur only in these situations:

Once we have the element tree we can iterate over every <incident> using the xmletreeElementTreefindall() method Each incident is returned as an xmletreeElement object We use the same technique for handling the element attributes as we did in the previous section s import_text_regex() method rst we store all the values in the data dictionary, and then we convert those values which are dates, numbers, or Booleans to the correct type For the airport and narrative subelements we use the xmletreeElementfind() method to nd them and read their text attributes If a text element has no text its text attribute will be None, so we must account for this when reading the narrative text element since it might be empty In all cases, the attribute values and text returned to us do not contain XML escapes since they are automatically unescaped As with all the XML parsers used to process aircraft incident data, an exception will occur if the aircraft or narrative element is missing, or if one of the attributes is missing, or if one of the conversions fails, or if any of the numeric data is out of range this ensures that invalid data will cause parsing to stop and for an error message to be output The code at the end for creating and storing incidents and for handling exceptions is the same as we have seen before

java LDAPModify -D "cn=directory manager" -w password -a dn: cn=Find all persons, cn=config, cn=ldbm objectclass: top objectclass: vlvSearch cn: Find all persons vlvbase: o=Airiuscom vlvfilter: objectclass=person vlvscope: 2 dn: cn=LastNameFirstName, cn=Find all persons, cn=config, cn=ldbm objectclass: top objectclass: vlvIndex cn: LastNameFirstName vlvsort: sn givenName ctrl-D (Unix) or ctrl-Z (Windows) cd /usr/netscape/server4/slapd-foo stop-slapd vlvindex "LastNameFirstName" start-slapd

In a cast, when the actual class of the object referenced by the value of the operand expression is not compatible with the target type speci ed by the cast operator ( 55, 1516); in this case a ClassCastException is thrown In an implicit, compiler-generated cast introduced to ensure the validity of an operation on a non-rei able type

DOM (Document Object Model)

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