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Now that we know how to construct the contents of a control using the BER package, how do we decode a byte array received from the server into something usable in an application Let s look at LDAPVirtualListResponse

identical to list comprehensions, the difference being that they are enclosed in parentheses rather than brackets Here are their syntaxes:

capture conversion ( 5110) At run time, the result of the eld access expression is computed as follows:

(expression for item in iterable) (expression for item in iterable if condition)

TABLE 16-1

If the eld is static:

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In the preceding chapter we created some iterator methods using yield expressions Here are two equivalent code snippets that show how a simple for in loop containing a yield expression can be coded as a generator:

The Primary expression is evaluated, and the result is discarded If evaluation of the Primary expression completes abruptly, the eld access expression completes abruptly for the same reason If the eld is final, then the result is the value of the speci ed class variable in the class or interface that is the type of the Primary expression If the eld is not final, then the result is a variable, namely, the speci ed class variable in the class that is the type of the Primary expression

BERBitString BERBoolean BEREnumerated BERInteger BERNull BERNumericString BERObjectId BEROctetString BERPrintableString BERReal BERUTCTime BERVisibleString

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def items_in_key_order(d): for key in sorted(d): yield key, d[key] def items_in_key_order(d): return ((key, d[key]) for key in sorted(d))

If the eld is not static:

BitString Boolean Enumerated Integer NULL Numeric ObjectID OctetString PrintableString Real UTCTime VisibleString

Both functions return a generator that produces a list of key value items for the given dictionary If we need all the items in one go we can pass the generator returned by the functions to list() or tuple(); otherwise, we can iterate over the generator to retrieve items as we need them Generators provide a means of performing lazy evaluation, which means that they compute only the values that are actually needed This can be more ef cient than, say, computing a very large list in one go Some generators produce as many values as we ask for without any upper limit For example:

The Primary expression is evaluated If evaluation of the Primary expression completes abruptly, the eld access expression completes abruptly for the same reason If the value of the Primary is null, then a NullPointerException is thrown

This function will return 00, 025, 05, and so on, forever Here is how we could use the generator:

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Note, speci cally, that only the type of the Primary expression, not the class of the actual object referred to at run time, is used in determining which eld to use Thus, the example:

TABLE 16-2

The break statement is essential without it the for in loop will never nish At the end the result list is [00, 025, 05, 075, 10] Every time we call quarters() we get back a generator that starts at 00 and increments by 025; but what if we want to reset the generator s current value It is possible to pass a value into a generator, as this new version of the generator function shows:

class S { int x = 0; } class T extends S { int x = 1; } class Test { public static void main(String[] args) { T t = new T(); Systemoutprintln("tx=" + tx + when("t", t)); S s = new S(); Systemoutprintln("sx=" + sx + when("s", s)); s = t; Systemoutprintln("sx=" + sx + when("s", s)); }

As with the request control, LDAPVirtualListResponse extends LDAPControl and passes its unique OID to the superclass constructor The main local constructor takes a byte array as input and parses it into member variables:

def quarters(next_quarter=00): while True:

If the eld is final, then the result is the value of the speci ed instance variable in the object referenced by the value of the Primary

public class LDAPVirtualListResponse extends LDAPControl { public final static String VIRTUALLISTRESPONSE = "21684011137303410"; /** * Constructs a new LDAPVirtualListResponse * object * @param value a BER-encoded byte array * @see netscapeldapLDAPControl */ public LDAPVirtualListResponse( byte[] value ) { super( VIRTUALLISTRESPONSE, true, null ); m_value = value; parseResponse(); }

received = (yield next_quarter) if received is None: next_quarter += 025 else: next_quarter = received

If the eld is not final, then the result is a variable, namely, the speci ed instance variable in the object referenced by the value of the Primary

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