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public FlightLeg(Airport departFrom, Date departOn, Airport arriveAt, Date arriveOn) { this.arriveAt = arriveAt; this.arriveOn = arriveOn; this.departFrom = departFrom; this.departOn = departOn; } public Airport getArriveAt() { return arriveAt; } public Date getArriveOn() { return arriveOn; } public Date getDepartOn() { return departOn; } public Airport getDepartFrom() { return departFrom; } }

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if [ "$1" != "" ] then if [ -f $1 ] then while read LINE do populate done < $1 else echo "$1 Does not exist, please try again" fi

Once the domain model is flushed out, it is now time to define the service interface (see Listing 4-6). This interface provides easy access to the use cases through the fa ade pattern. These methods are coarse grained and stateless (i.e., multiple calls into the methods may happen concurrently without side effects). We say they are coarse grained to indicate that a single method call will accomplish the use case, instead of many small calls.

Table 8.2 Examples of formatting conversion characters. These are examples of applied formatting to the previous conversion characters. Each example uses the conversion character m. Character %5m %-5m %.5m Description The message (m) must be at least 5 characters long. To ensure this, the formatter will pad to the left if necessary. The message (m) must be at least 5 characters long. To ensure this, the formatter will pad to the right if necessary. The message (m) should be a maximum of 5 characters long. If necessary, the formatter will truncate it to 5 characters.

If it has, the script tests whether the file exists. If the file is validated, the script redirects it into the back end of the while loop. This loop calls the populate function for each line of the file. If the file named in the command line doesn t exist, we just output a simple error message. You may think performing a cat of the file and piping the result into the front of the while loop would work, but this can have unforeseen results. It works in ksh without a hitch, but not in pdksh or in bash. (For more information about piping data into a while loop, see 10.) Redirecting the file into the back end of the while loop always works. If no filename was passed to the script from the command line, we assume the data is being piped into the script.

Listing 4-6. FlightService Interface public interface FlightService { List<SpecialDeal> getSpecialDeals(); List<Flight> findFlights(SearchFlights search); } For the purposes of our example, we won t concern ourselves with how this interface is implemented. We want to show off Spring MVC, so in the meantime we will create a DummyFlightService implementation of FlightService that returns simple preset values. In the real world, you would most likely create a Data Access Object (DAO) layer for dealing with persistence. The service implementation would delegate to the DAOs, perform any extra processing necessary, and return the results. The Spring Framework contains many example projects that illustrate this architecture, and we recommend browsing through the source code. For a more in-depth discussion of the implementation of a Spring Framework application, consult the book Pro Spring by Rob Harrop and Jan Machacek (Apress, 2005).

When formatting messages, you can combine format modifiers. For example, the modifier %10.50c adds padding to the left of the logger name if it contains fewer than 10 characters, and truncates it if it s longer than 50 characters.

Each line is read in sequence, and the populate function is called to expand the variables to their values. Once the script has finished processing all the data, the counter variable contains the number of the last line of data that was processed.

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