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You should now be able to start using ed effectively. Take note again that the ed input can contain multiple entries to perform several tasks on a single file. Often the desired search strings or their replacements become known just before the target file is manipulated. For example, your ed command input may depend on accessing variables that were set prior to creating the ed script. For more examples of this technique in action, take a look at the scripts in s 36 and 37.

As mentioned before, Spring MVC applications are typically layered with the service layer encapsulating the actual use cases. Therefore, we start by creating the service layer interface, helping us keep the business logic out of the web layer. Because the Spring Framework does such a good job at managing plain old Java objects (POJOs) and beans, we re not afraid of creating many well-defined and orthogonal Java objects that together form the entire system. Creating the interface first also allows development work to begin on the web layer, before the actual interface implementation is complete.

log4j.logger.ejb.session=DEBUG, myappender #setup appender myappender log4j.appender.myappender=org.apache.log4j.ConsoleAppender log4j.appender.myappender.layout=org.apache.log4j.PatternLayout log4j.appender.myappender.ConversionPattern=%5p [%t] - %m%n

The following is a short script to escape all the special characters in a file that is specified from the command line. The script is meant to be a baseline that can escape any character, though you will likely tailor it to your own needs. The script performs its task using here-document syntax. The here-document notation can be found in the shell manual page. The script starts simply enough. The usage is defined and then the input is validated to make sure a file is specified and that it exists.

Use Case #1

After specifying the PatternLayout class as the formatter, also indicate the value of the ConversionPattern attribute for the appender. The ConversionPattern value tells the PatternLayout class how to format your message. Using this setup, the following shows output from some sample code:

#!/bin/sh usage="$0 {target file containing any special characters to be escaped}" if [ $# -eq 0 ] then echo $usage exit 1 fi if [ ! -f $1 ] then echo File $1 does not exist echo $usage exit 1 else file=$1 fi

The first use case doesn t specify any type of uniqueness to the special deals. That is, every user will see the same special deals when they view the home page. For now, the most simple thing to do is create a getSpecialDeals() method on the service interface (Listing 4-6) returning a list of SpecialDeal objects. The SpecialDeal class (Listing 4-2) is defined by the use case to include three parameters: the departure airport, the arrival airport, and the total cost. The airports will be instances of the Airport class (see Listing 4-1), so that we can encapsulate both the name and airport code. Listing 4-1. Airport Class public class Airport { private String name; private String airportCode; public Airport(String name, String airportCode) { this.name = name; this.airportCode = airportCode; } public String getAirportCode() { return airportCode; } public String getName() { return name; } public String toString() { return name + " (" + airportCode + ")"; } } Like the Airport class, we have made the SpecialDeal class (Listing 4-2) immutable, to make it easier and safer to use. As it stands now, the only use of this class is to return read-only data, so in this case it is justified.

public void testMethod(){ Logger ejbSession = Logger.getLogger( "ejb.session" ); ejbSession.debug("Writing statement 1" ); ejbSession.debug("Writing statement 2" ); }

If these requirements aren t met, the script displays the usage information and exits. The following code starts the here-document for input to the ed command:

For more notes on immutability for objects, consult Joshua Bloch s excellent book Effective Java Tip

Invoking testMethod() produces the following output based on the appender setup for the logger ejb.session:

The first search and replace is for the escape character itself. This replacement must be first or it will replace the backslash of characters that have already been escaped. These replacements are the most simple of the bunch:

Listing 4-2. SpecialDeal Class public class SpecialDeal { private private private private private Airport departFrom; Airport arriveAt; BigDecimal cost; Date beginOn; Date endOn;

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