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There are ve conversion contexts in which conversion of expressions may occur Each context allows conversions in some of the categories named above but not others The term conversion is also used to describe the process of choosing a speci c conversion for such a context For example, we say that an expression that is an actual argument in a method invocation is subject to method invocation conversion, meaning that a speci c conversion will be implicitly chosen for that expression according to the rules for the method invocation argument context One conversion context is the operand of a numeric operator such as + or * The conversion process for such operands is called numeric promotion Promotion is special in that, in the case of binary operators, the conversion chosen for one operand may depend in part on the type of the other operand expression This chapter rst describes the eleven categories of conversions ( 51), including the special conversions to String allowed for the string concatenation operator + Then the ve conversion contexts are described: Assignment conversion ( 52, 1526) converts the type of an expression to the type of a speci ed variable Assignment conversion may cause a OutOfMemoryError (as a result of boxing conversion ( 517)), a NullPointer-

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LDAPConnection ld = new LDAPConnection(); try { ldconnect( HOST, PORT); ldauthenticate( "cn=Directory Manager", "PASSWORD" ); } catch ( LDAPException e ) { }

the nal example we will also see how to handle operators and their precedences and associativities

Exception (as a result of unboxing conversion ( 518)), or a ClassCastException (as a result of an unchecked conversion ( 519)) to be

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In the previous section s third subsection we created a recursive descent parser for blk les In this subsection we will create a PyParsing implementation of a blocks parser that should be easier to understand and be more maintainable Two example blk les are shown in Figures 148 (525 ) and 1410 (526 ) The BNF for the blocks format is shown in Figure 1412 (527 ) We will look at the creation of the parser elements in two parts, then we will look at the helper function, and then we will see how the parser is called And at the end we will see how the parser s results are transformed into a root block with child blocks (which themselves may contain child blocks, etc), that is our required output

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thrown at run time Method invocation conversion ( 53, 159, 1512) is applied to each argument in a method or constructor invocation and, except in one case, performs the same conversions that assignment conversion does Method invocation conversion may cause a OutOfMemoryError (as a result of boxing conversion ( 517)), a NullPointerException (as a result of unboxing conversion ( 518)), or a ClassCastException (as a result of an unchecked conversion ( 519)) to be thrown at run time Casting conversion ( 55) converts the type of an expression to a type explicitly speci ed by a cast operator ( 1516) It is more inclusive than assignment or method invocation conversion, allowing any speci c conversion other than a string conversion, but certain casts to a reference type may cause an exception at run time String conversion ( 54, 15181) allows any type to be converted to type String

If a blank password is passed, the authentication will succeed but it will be an anonymous authentication (authenticating as the anonymous user) Although the authentication process itself will not throw an error, anytime an operation that requires privileges is requested, an exception will be thrown When your program accepts passwords as input, you should check that the supplied password is not blank If the program requires authentication other than as anonymous, you should reject a DN or password that is blank You may issue another authenticate operation against an existing connection The operation allows for changing authentication information after a connection has been established Finally, the user ID must be speci ed as a full DN Users usually do not know the full DNs of their user IDs, so typically a search must be performed anonymously (or as a special user) to locate the DN corresponding to the user ID before the user can authenticate to the directory 7 will provide sample code and discuss authentication in detail; the following code just provides the highlights of authentication with a user-supplied user ID and password

left_bracket, right_bracket = map(Suppress, "[]") new_rows = Word("/")("new_rows")setParseAction( lambda tokens: len(tokensnew_rows)) name = CharsNotIn("[]/\n")("name")setParseAction( lambda tokens: tokensnamestrip()) color = (Word("#", hexnums, exact=7) | Word(alphas, alphanums))("color") empty_node = (left_bracket + right_bracket)setParseAction( lambda: EmptyBlock)

Numeric promotion ( 56) brings the operands of a numeric operator to a common type so that an operation can be performed Here are some examples of the various contexts for conversion:

import netscapeldap*; import javautil*; /** * Given a uid and password, find the corresponding entry * and authenticate */ public class UidLogin {

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