ABAP AND XML

COMP268

Exercises / Solutions

Stefan Bresch / SAP AGThomas Ritter / SAP AGChristoph Wedler / SAP AG

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General Remarks

To get features like code completion and ST debugging, you have to switch to the new debugger and the new editor: Go to transaction SE80, select “Utilities->Settings…” tab “ABAP editor”; check “Front End Editor (New) in tab “Editor” and “New Debugger” in tab “Debugging”.

Exercise 1 – XML Processing with SXML Reader

Exercise descriptionLearn how to parse an XML document using the SXML (dataset) reader. Go to transaction SE38 (or SE80), create a new program with type “Executable program”, proposed name ZCOMP268_SXML_<nr>, where <nr> is your group number.

Create an instance of the class CL_SXML_DATASET_READER. The xml document to be parsed is stored in file ZCOMP268.

Loop over all the nodes in the xml document using method NEXT_NODE. Stop if the final state IF_SXML_NODE=>CO_NT_FINAL is reached.

In this loop, determine the maximum depth of the documents by increasing a depth counter on open element and decreasing it on a close element.

Don’t forget to close the dataset reader at the end.

Additional / HintIf you are interested in displaying the XML document in your program, you can use method SHOW_XML of class ZCL_ABAP_BROWSER. The method expects an SXML reader instance. Create a dataset reader instance for file ZCOMP268.

Exercise 2 – ABAP Data Serialization with CALL TRANSFORMATION ID

Exercise descriptionLearn how to serialize and de-serialize ABAP data. Go to transaction SE38 (or SE80), create a new program with type “Executable program”, proposed name ZCOMP268_BXML_<nr>, where <nr> is your group number.

In this program, define a local class with a public attribute of elementary type. Don’t forget to add the interface IF_SERIALIZABLE_OBJECT. No implementation part is needed.

Create an instance of this class, and set the public attribute to some value. Serialize your instance using CALL TRANSFORMATION ID and result type XSTRING. Clear the reference variable. De-serialize the data using CALL TRANSFORMATION ID and source type XSTRING..

Additionally, learn how to use binary XML. Create a binary XML writer instance passing the constant IF_SXML=>CO_XT_BINARY to the factory method CREATE

of the class CL_SXML_STRING_WRITER. Serialize your instance using CALL TRANSFORMATION ID and the binary writer. Access the binary XML with writer method GET_OUTPUT. Create an XML reader instance of class CL_SXML_STRING_READER passing the binary data to the CREATE

method. The reader identifies the binary XML automatically De-serialize the binary data using CALL TRANSFORMATION ID and the binary reader.

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Exercise 3 – ABAP XML Mapping with Simple Transformations

Exercise descriptionLearn how to process an XML document using Simple Transformations. Go to transaction SE38 (or SE80), create a new program with type “Executable program”, proposed name ZCOMP268_ST_<nr>, where <nr> is your group number.

Go to transaction STRANS (or SE80), create a new transformation with type “Simple transformation“, proposed name ZCOMP268_ST_<nr>, where <nr> is your group number and activate the transformation.

In your ABAP program, use CALL TRANSFORMATION ID to create a simple XML document (XSTRING) by serializing an elementary data object or literal (integer, string or character). Use the binding name ROOT.

Now, de-serialize your data using the Simple Transformation ZCOMP268_ST_<nr>. In your Simple Transformation, you have to process the XML document, which is in the asXML format. The generated transformation data root is ROOT, don’t change it. Match the asXML envelope using literal XML content (Copy the envelope with the elements <asx:abap> and <asx:values> to the main template).

Match the <ROOT> element. Move the value of the <ROOT> element to the data root ROOT using the tt:value instruction.

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Proposed Solutions

Exercise 1 – XML Processing with SXML Reader

DATA reader TYPE REF TO if_sxml_reader.DATA max TYPE i.DATA depth TYPE i.

reader = cl_sxml_dataset_reader=>create( filename = 'ZCOMP268' ).reader->next_node( ).WHILE reader->node_type <> if_sxml_node=>co_nt_final.  CASE reader->node_type.    WHEN if_sxml_node=>co_nt_element_open.      depth = depth + 1.    WHEN if_sxml_node=>co_nt_element_close.      depth = depth - 1.  ENDCASE.  IF depth > max.    max = depth.  ENDIF.  reader->next_node( ).ENDWHILE.DATA dataset_reader TYPE REF TO cl_sxml_dataset_reader.dataset_reader ?= reader.dataset_reader->close( ).

Exercise 1 – XML Processing with SXML Reader –Additional / Hint

DATA dataset_reader TYPE REF TO cl_sxml_dataset_reader.dataset_reader ?= cl_sxml_dataset_reader=>create( filename = 'ZCOMP268' ).zcl_abap_browser=>show_xml( xml_reader = dataset_reader ).dataset_reader->close( ).

Exercise 2 – ABAP Data Serialization with CALL TRANSFORMATION ID

CLASS lcl DEFINITION.  PUBLIC SECTION.    INTERFACES: IF_SERIALIZABLE_OBJECT.    DATA i TYPE i.ENDCLASS.

START-OF-SELECTION.

  DATA my_lcl TYPE REF TO lcl.  CREATE OBJECT my_lcl.  my_lcl->i = 42.

  DATA xml TYPE xstring.  CALL TRANSFORMATION ID    SOURCE root = my_lcl    RESULT XML xml.

  CLEAR my_lcl.

  CALL TRANSFORMATION ID    SOURCE XML xml    RESULT root = my_lcl.

Exercise 2 – ABAP Data Serialization with CALL TRANSFORMATION ID and binary XML

  DATA writer TYPE REF TO cl_sxml_string_writer.  writer = cl_sxml_string_writer=>create( if_sxml=>co_xt_binary ).  CALL TRANSFORMATION ID    SOURCE root = my_lcl

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    RESULT XML writer.  xml = writer->get_output( ).

  DATA reader TYPE REF TO cl_sxml_string_reader.  reader ?= cl_sxml_string_reader=>create( xml ).  CALL TRANSFORMATION ID    SOURCE XML reader    RESULT root = my_lcl.

Exercise 3 – ABAP XML Mapping with Simple Transformations - ABAP

DATA xml TYPE xstring.  CALL TRANSFORMATION ID  SOURCE root = 42  RESULT XML xml.

DATA i TYPE i.CALL TRANSFORMATION zcomp268_st_00  SOURCE XML xml  RESULT root = i.

Exercise 3 – ABAP XML Mapping with Simple Transformations - ST

<?sap.transform simple?><tt:transform xmlns:tt="http://www.sap.com/transformation-templates">

  <tt:root name="ROOT"/>

  <tt:template>    <asx:abap xmlns:asx="http://www.sap.com/abapxml">      <asx:values>        <ROOT>          <tt:value ref="ROOT"/>        </ROOT>      </asx:values>    </asx:abap>  </tt:template>

</tt:transform>

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