ABAP_to_the_Future

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7Exception Classes and Design by Contractlo_monster ?= data_object.result = abap_false.CHECK lo_monster->scariness CS 'SCARY'.CHECK lo_monster->bolts_in_neck EQ 2.CHECK lo_monster->fluffiness EQ 0.CHECK lo_monster->colour NE 'PINK'.result = abap_true.ENDMETHOD."IF_CONSTRAINT~is_validMETHOD if_constraint~get_description.*-------------------------------------------------------** RETURNING result TYPE string_table*-------------------------------------------------------** Local VariablesDATA: ld_message TYPE string.ld_message = 'Monster is no longer a monster!'.APPEND ld_message TO result.ENDMETHOD. "IF_CONSTRAINT~get_descriptionENDCLASS. "Monster Constraint ImplementationListing 7.13 Pink and Fluffy is not Scary!You could then add the code in Listing 7.14 to the end of every method in themonster class. In this way, you can be sure that no method call will have anadverse effect on the essential nature of the monster.zcl_dbc=>ensure(that = 'The Monster is still a Monster'which_is_true_if = lo_monster_constraint->if_constraint~is_valid( mo_class_under_test ) ).Listing 7.14 Calling a Class Invariant at the End of Each Method CallNoteInstead of adding the code in Listing 7.14 to the end of every method call, you couldalternatively add such a call to the end of every unit test you do on the monster class. Itwould not make much sense to do both.280
Summary 7.47.4 SummaryThis chapter introduced you to exception classes, explaining the types that areavailable, how to design them, and design by contract exceptions. After readingthis chapter, you should now be familiar with the myriad ways in which you candeal with an error that has occurred, which is in sharp contrast to the traditionalapproach of totally ignoring the problem and which will ensure that your programsare robust and your users don’t scream in frustration all day long.Recommended Reading왘 Design By Contract:http://se.ethz.ch/~meyer/publications/computer/contract.pdf (Bertrand Meyer)왘 Message Handling—Finding the Needle in the Haystack:http://wiki.scn.sap.com/wiki/display/profile/2007/07/09/Message+Handling+-+Finding+the+Needle+in+the+Haystack281
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Paul HardyABAP ®to the Futurewww.a
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To my mother, Mary, who would have
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Notes on UsageThis e-book is protec
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ContentsForeword ..................
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Contents2.9 Unit Testing ..........
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Contents7.3.2 Class Invariants ....
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Contents11.1.2 Downloading ABAP2XLS
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Contents15.3 Bottom-Up Development
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Forewordtoolsets your company shoul
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1It may be hard for an egg to turn
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IntroductionSAP introduced ABAP Obj
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Structure of the Booktechnologies d
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Structure of the Book(BOPF), which
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The Example ApplicationBaron Franke
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It’s best not to stare at the sun
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Installation 1.1very basics of how
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Installation 1.1Figure 1.2 Installi
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Installation 1.1Figure 1.4 Eclipse
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Features 1.2Figure 1.6 ABAP in Ecli
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Features 1.2Figure 1.8 Searching fo
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Features 1.2oper to such an extent
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Features 1.2to forget the exact nam
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Features 1.2METHODS: main.ENDCLASS.
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Features 1.2The definition and impl
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Features 1.2ld_description1 = 'BONK
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Features 1.2Figure 1.16 Extracting
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Features 1.2ld_result = ld_use_this
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Features 1.2Automatically creating
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Testing and Troubleshooting 1.3Figu
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Testing and Troubleshooting 1.3does
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Testing and Troubleshooting 1.3by r
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Testing and Troubleshooting 1.3Figu
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Customization Options with User-Def
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Summary 1.5design UML diagrams insi
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It's a beautiful thing, the Destruc
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Database Access 2.1Figure 2.1 Micro
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Database Access 2.1lower the sanity
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Database Access 2.1account of secon
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Database Access 2.1efficient way to
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Declaring and Creating Variables 2.
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String Processing 2.3LD_RESULT = |M
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Calling Functions 2.4However, now y
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Calling Functions 2.4sometimes the
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Conditional Logic 2.52.5.1 Using Fu
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Conditional Logic 2.5If the functio
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Conditional Logic 2.5l_day = 'Tuesd
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Internal Tables 2.6WHEN cs_monster_
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Internal Tables 2.6unique hashed ke
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Internal Tables 2.6In Section 2.2.2
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Internal Tables 2.6a traditional RE
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Internal Tables 2.6monster_name TYP
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Internal Tables 2.6This saves you a
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Internal Tables 2.6you want to modi
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Internal Tables 2.6at a time; someh
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Internal Tables 2.6DATA( lt_average
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Object-Oriented Programming 2.7In 7
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Search Helps 2.8to the end of the d
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Unit Testing 2.9So, you can imagine
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Unit Testing 2.9IF id_chemcial_type
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Cross-Program Communication 2.10The
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Code without tests is bad code. It
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Eliminating Dependencies 3.13.1 Eli
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Eliminating Dependencies 3.1WHEN 'N
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Implementing Mock Objects 3.2mo_use
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Implementing Mock Objects 3.2rd_ans
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Writing and Implementing Unit Tests
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Automating the Test Process 3.4supp
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Automating the Test Process 3.4whil
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Automating the Test Process 3.4INSE
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Automating the Test Process 3.4ld_c
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Automating the Test Process 3.4cl_a
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Behavior-Driven Development 3.5you
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Summary 3.6Whatever you want to cal
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If builders built buildings the way
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Automatic Run of Unit Tests 4.14.1
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Mass Checks 4.2program that was wri
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Mass Checks 4.2Figure 4.5 ATC Confi
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Mass Checks 4.2In the Description f
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Mass Checks 4.2objects and set a va
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Mass Checks 4.2Next, go into SE80 t
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Mass Checks 4.2CASE statement, like
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Mass Checks 4.2On the next screen (
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Recent Code Inspector Enhancements
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Debugging is twice as hard as writi
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Script Tab Overview 5.1Figure 5.1 D
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Script Tab Overview 5.1rally, then
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Coding the SCRIPT Method 5.25.2 Cod
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Coding the SCRIPT Method 5.2For exa
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Coding the SCRIPT Method 5.2call an
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Coding the INIT and END Methods 5.3
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Summary 5.4script, you can tell the
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6The Enhancement Framework and New
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6The Enhancement Framework and New
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8Business Object Processing Framewo
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9BRFplusProcessResultsTake Orderfor
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9BRFplus9.1 The Historic Location o
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9BRFplusThe flowchart is shown to t
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9BRFplus9.1.3 Rules in ABAPProgramm
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9BRFplusFigure 9.6 Creating a BRFpl
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9BRFplussort of object is what—fo
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9BRFplusHere, there is only one res
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9BRFplusIn the pop-up shown in Figu
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9BRFplusdecision tree and a decisio
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9BRFplusFigure 9.17 Adding a Decisi
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9BRFplusis also a lot of text on ea
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9BRFplusAt the bottom of the screen
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9BRFplusanother explanation could b
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9BRFplusFigure 9.26 Adding Formulas
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9BRFplushave a Check button at the
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9BRFplusIn case you don’t think y
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9BRFplusTo find the appropriate per
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9BRFplusues from the spreadsheet th
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9BRFplusFigure 9.34 Overlap Check S
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9BRFplusFigure 9.37 Simulation: 3 o
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9BRFplustask that is about to be cr
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9BRFplusFigure 9.42 Generated BRFpl
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9BRFplus9.6.2 Application ExitsWhen
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9BRFpluscase feature (which require
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Computer science departments have a
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Getting Started 10.12. Calling the
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Getting Started 10.1The first probl
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Getting Started 10.1FROM ztvc_monst
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Designing a Report Interface 10.2Th
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Designing a Report Interface 10.2Fi
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Designing a Report Interface 10.2Se
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Designing a Report Interface 10.2me
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Designing a Report Interface 10.2if
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Designing a Report Interface 10.2
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Designing a Report Interface 10.2In
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Designing a Report Interface 10.2ME
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Designing a Report Interface 10.2IF
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Designing a Report Interface 10.2Fi
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Designing a Report Interface 10.2fo
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Adding Custom Command Icons Program
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Editing Data 10.4id_title= 'Monster
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Editing Data 10.4SAP class CL_SALV_
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Editing Data 10.4it_user_commands =
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Editing Data 10.4table containing t
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Handling Large Internal Tables with
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Q. How do you identify an extrovert
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The Basics 11.1nity can benefit. Th
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The Basics 11.1Figure 11.5 Workshee
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The Basics 11.1Adding Desired Attri
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The Basics 11.1ld_pathld_fullpathTY
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Enhancing Custom Reports with ABAP2
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Tips and Tricks 11.3"44300 is the s
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Tips and Tricks 11.3However, it wor
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Summary 11.4As an example, in Secti
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12Web Dynpro ABAP and Floorplan Man
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What if you could find brand new wo
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Architecture 13.11. Use SAP Gateway
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Prerequisites 13.2to SAP PI, direct
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Backend Tasks: Creating the Model U
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Frontend Tasks: Creating the View a
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Adding Elements with OpenUI5 13.5Du
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Adding Elements with OpenUI5 13.5Fi
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Adding Elements with OpenUI5 13.5}"
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Importing SAPUI5 Applications to SA
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Summary 13.8Synactive must have bee
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The worst part of holding the memor
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The Promises of Shared Memory 14.11
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Creating and Using Shared Memory Ob
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Updating the Database and Shared Me
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Troubleshooting 14.4send data from
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Troubleshooting 14.4* updated, so w
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Troubleshooting 14.4memory root obj
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When you innovate, you’ve got to
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Introduction to Code Pushdown 15.11
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Top-Down Development 15.2CDS ViewAM
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Top-Down Development 15.2Creating a
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Top-Down Development 15.2You always
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Top-Down Development 15.2To recap,
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Top-Down Development 15.2SELECT *FR
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Top-Down Development 15.2{ vbak.zz_
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Top-Down Development 15.2SummaryIn
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Top-Down Development 15.2USING zt_m
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Top-Down Development 15.2-- declare
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Bottom-Up Development 15.315.3 Bott
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Bottom-Up Development 15.3Figure 15
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Locating Code that Can Be Pushed Do
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Other Modifications to ABAP for SAP
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Summary 15.6SP 12. So SAP clearly h
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16ConclusionThey want everything to
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AImproving Code ReadabilityAs Rober
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The What vs. the How A.2When it com
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BMaking Programs FlexibleOne of the
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Making Programs FlexibleBExampleThe
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Making Programs FlexibleBThis appro
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Making Programs FlexibleBBoth examp
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IndexAABAP 7.02, 90, 96, 98, 103, 1
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IndexEclipse (Cont.)connect to back
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IndexSSALV, 408add custom icons, 44
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IndexXXML, 460, 463XSDBOOL, 105ZZ c
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About Us and Our ProgramThe website
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TrademarksThe common names, trade n
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