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Once the actual result set is acquired, the next() and previous() methods just keep track of the database cursor as they scroll through the result set. The only tricky part is being careful with the beginning and end indexes of the result set. Both methods use the total number of rows, the page size constant, and the return value of the getRow() method to determine how much data to return. The getRow() method of the ResultSet object returns the index number of the current row selected. Using a page-able mechanism like this one allows your clients to build pageable tables in their displays. Users can then navigate forward and backward through the result set as needed. Another convenience method you could easily add to this bean is a jump() method. A jump method could loop through successive calls of next() or previous() to reach a certain page of data. Since the bean knows the total number of pages, this would be a simple exercise.

Always returns the same locale for each request that can be set with setDefaultLocale(). Resolves a locale from the HTTP headers of the client request. Most browsers and other HTTP clients send the current locale in the header accept-language. Resolves the locale from an attribute held in the user s HttpSession. The attribute key can be configured on the resolver. A locale resolved from the session is not persisted between sessions; it must be set once per user per session. Similar to a SessionLocaleResolver, but the choice of locale is persisted between sessions.

abs() acos() asin() atan() atan2() cos() cosh() exp() floor() fmod() hypot() int() log() pow() sin() sinh() sqrt() tan() tanh()

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Note If you use a SessionLocaleResolver or a CookieLocaleResolver, it will fall back to the accept-language locale in the request headers if a locale cannot be found in the session or cookie, respectively.

Absolute value Inverse cosine Inverse sine Inverse tangent Four-quadrant inverse tangent Cosine Hyperbolic cosine Exponential Round toward negative infinity Floating-point remainder of division Square-root of sum of squares Integer portion of a real number Natural logarithm Raise base number to an exponential power Sine Hyperbolic sine Square root Tangent Hyperbolic tangent

EJBs are hard workers that can perform many activities. In addition to working with data (covered in chapter 3), EJBs can be used to retrieve environment vari-

Listing 7-18 details the configuration of a LocaleResolver in the ApplicationContext. Listing 7-18. Configuring the AcceptHeaderLocaleResolver <bean id="localeResolver" class="org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver"/>

The bc utility is an arbitrary-precision calculator. This means the precision of the answer can be set at runtime through the use of the scale operator. Most of the mathematical shell utilities described up to this point focus on operations on whole numbers. The exception is the special library of functions available in ksh. With bc, you can set the scale (number of decimal places following the decimal point) so that results will be expressed as floatingpoint numbers of the precision you specify. The functional use of bc is very similar to the use of expr, as the following list shows: Addition: answer=`echo "$c+$d" | bc` Subtraction: answer=`echo "$c-$d" | bc` Multiplication: answer=`echo "$c*$d" | bc` Division: answer=`echo "$c/$d" | bc` Remainder: answer=`echo "$c%$d" | bc` Exponentiation: answer=`echo "$c^$d" | bc` Scale: The scale of a floating-point number is the number of digits that follow the decimal point. To set the scale when performing a calculation, you use answer=`echo "scale=5;$c/$d" | bc`. Trigonometric functions: To use the trigonometric functions, you must enable the math library by invoking bc using the -l switch. When the library is enabled, the default scale is set to 20 decimal places. The following examples set the scale to 5 places: Sine in radians: answer=`echo "scale=5;s($a)" | bc -l` Cosine in radians: answer=`echo "scale=5;c($a)" | bc -l` Arctangent in radians: answer=`echo "scale=5;s($a)" | bc -l`

ables, access the file system, send email, and more. This chapter also covers two important improvements added to EJBs with the 2.1 specification: the EJB timer service, and the use of EJBs as web service endpoints. You will find the following topics in this chapter:

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