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We create the required BER-encoded byte array by instantiating various basic BER objects (BERInteger in this case), adding them to sequence elements (BERSequence) as dictated by the ASN1 for the particular control, and then streaming the outermost element to a byte array Since the VLV request control contains a CHOICE eld, it must also include a tag (BERTag) that indicates which of the options is present The flattenBER method in LDAPControl (which is the superclass for all control classes) converts the results into a byte array appropriate for transmission in an LDAP request When a string rather than an index is used to identify the rst result, the following code constructs the byte array

functions = dict(a=add_dvd, e=edit_dvd, l=list_dvds, r=remove_dvd, i=import_, x=export, q=quit) functions[action](db)

The type of the Primary must be a reference type T, or a compile-time error occurs The meaning of the eld access expression is determined as follows: If the identi er names several accessible member elds of type T, then the eld access is ambiguous and a compile-time error occurs

private byte[] createPageSpecification( String subFilter, int beforeCount, int afterCount ) { /* A sequence */ BERSequence seq = new BERSequence(); seqaddElement( new BERInteger( beforeCount ) ); seqaddElement( new BERInteger( afterCount ) ); seqaddElement( new BERTag( BERTagCONTEXT|TAG_BYFILTER, new BEROctetString(subFilter), true) ); /* Optional context cookie */ if ( _context != null ) { seqaddElement( new BEROctetString(_context) );

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The choice is held as a one-character string in the action variable, and the database to be used is held in the db variable The import_() function has a trailing underscore to keep it distinct from the built-in import statement In the right-hand code snippet we create a dictionary whose keys are the valid menu choices, and whose values are function references In the second statement we retrieve the function reference corresponding to the given action and call the function referred to using the call operator, (), and in this example, passing the db argument Not only is the code on the right-hand side much shorter than the code on the left, but also it can scale (have far more dictionary items) without affecting its performance, unlike the left-hand code whose speed depends on how many elifs must be tested to nd the appropriate function to call The convert-incidentspy program from the preceding chapter uses this technique in its import_() method, as this extract from the method shows:

If the identi er does not name an accessible member eld of type T, then the eld access is unde ned and a compile-time error occurs

} /* Suck out the data and return it */ return flattenBER( seq ); }

call = {("aix", "dom"): selfimport_xml_dom, ("aix", "etree"): selfimport_xml_etree, ("aix", "sax"): selfimport_xml_sax, ("ait", "manual"): selfimport_text_manual, ("ait", "regex"): selfimport_text_regex, ("aib", None): selfimport_binary, ("aip", None): selfimport_pickle} result = call[extension, reader](filename)

Otherwise, the identi er names a single accessible member eld of type T and the type of the eld access expression is the type of the member eld after

The complete method is 13 lines long; the extension parameter is computed in the method, and the reader is passed in The dictionary keys are 2-tuples, and the values are methods If we had used if statements, the code would be 22 lines long, and would not scale as well

A eld access expression may access a eld of an object or array, a reference to which is the value of either an expression or the special keyword super (It is also possible to refer to a eld of the current instance or current class by using a simple name; see 656)

The string option uses a BEROctetString to encode the value and sets the tag for the CHOICE eld to 1 (TAG_BY_FILTER) The BERTagCONTEXT constant, which is OR ed with the tag number, indicates that the tag number is speci c to this control; it is not a global tag number shared with other BER elements The netscapeldapberstream package includes the classes listed in Table 16-1 for encoding basic data types Of these classes, the ones you are most likely to use in writing new controls are BERInteger, BEROctetString, BERBoolean, and BEREnumerated The classes listed in Table 16-2 provide the constructs for grouping and tagging the data elements The BERTag element always contains another element, which may be a basic type or another BERTag

Back in 6 we introduced generator functions and methods It is also possible to create generator expressions These are syntactically almost

because the out-of-memory condition is detected after the dimension expression oldlen = len is evaluated Compare this to class instance creation expressions ( 159), which detect the out-of-memory condition before evaluating argument expressions ( 1596)

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