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Methods are overridden on a signature-by-signature basis If, for example, an interface declares two public methods with the same name, and a subinterface overrides one of them, the subinterface still inherits the other method An interface inherits from its direct superinterfaces all methods of the superinterfaces that are not overridden by a declaration in the interface It is possible for an interface to inherit several methods with override-equivalent signatures ( 842) Such a situation does not in itself cause a compile-time error The interface is considered to inherit all the methods However, one of the inherited methods must must be return type substitutable for any other inherited method; otherwise, a compile-time error occurs (The throws clauses do not cause errors in this case) There might be several paths by which the same method declaration is inherited from an interface This fact causes no dif culty and never of itself results in a compile-time error 942 Overloading If two methods of an interface (whether both declared in the same interface, or both inherited by an interface, or one declared and one inherited) have the same name but different signatures that are not override-equivalent ( 842), then the

def export_binary(self, filename, compress=False): def pack_string(string): data = stringencode("utf8") format = "<H{0}s"format(len(data)) return structpack(format, len(data), data)

method name is said to be overloaded This fact causes no dif culty and never of itself results in a compile-time error There is no required relationship between the return types or between the throws clauses of two methods with the same name but different signatures that are not override-equivalent 943 Examples of Abstract Method Declarations The following examples illustrate some (possibly subtle) points about abstract method declarations 9431 Example: Overriding

This chapter has discussed the LDAPUrl class for representing an anonymous search, issues with storing non-ASCII string data, how to share a single connection among multiple threads, when and how to use the search-level cache class, and a few techniques to squeeze more performance out of your LDAP-enabled application 16 will explore a few of the more advanced features of the SDK

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Methods declared in interfaces are abstract and thus contain no implementation About all that can be accomplished by an overriding method declaration, other than to af rm a method signature, is to re ne the return type or to restrict the exceptions that might be thrown by an implementation of the method Here is a variation of the example shown in ( 8431):

The strencode() method returns a bytes object with the string encoded according to the speci ed encoding UTF-8 is a very convenient encoding because it can represent any Unicode character and is especially compact when representing ASCII characters (just one byte each) The format variable is set to hold a struct format based on the string s length For example, given the string

n this chapter we will explore some of the less followed paths through the SDK, including managing the schema, using Virtual List Views, and handling password expiration We ll take a look at the built-in controls of the SDK for accessing LDAP server functionality beyond what is de ned by the protocol standards, how to write your own control, how to manage referrals, how to access extended operations, and how to use the asynchronous interface

class BufferException extends Exception { BufferException() { super(); } BufferException(String s) { super(s); } } public interface Buffer { char get() throws BufferEmpty, BufferException; } public interface InfiniteBuffer extends Buffer { char get() throws BufferException; // override }

The struct module provides structpack(), structunpack(), and some other functions, and the structStruct() class The structpack() function takes a struct format string and one or more values and returns a bytes object that holds all the values represented in accordance with the format The structunpack() function takes a format and a bytes or bytearray object and returns a tuple of the values that were originally packed using the format For example:

We ran into the schema earlier in this book 2 introduced a few of the most commonly used object classes and attributes We addressed the constraints imposed by the schema in 11, when we wanted to add values for various user preferences to the user s directory entry If schema enforcement is enabled in a server, you can add values only for attributes that are de ned as mandatory or optional for the object classes of the entry

9432 Example: Overloading In the example code:

data = structpack("<2h", 11, -9) items = structunpack("<2h", data) # data == b'\x0b\x00\xf7\xff' # items == (11, -9)

interface PointInterface { void move(int dx, int dy); } interface RealPointInterface extends PointInterface { void move(float dx, float dy); void move(double dx, double dy); }

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