Get Example source ABAP code based on a different SAP table
Classes and Interfaces for Streams The classes and interfaces of streams are in the package SABP_STREAMS_AND_LOCATORS. Interfaces and classes that have been released for use are exposed in their package interface SABP_STREAMS_AND_LOCATORS. The following figure shows the hierarchy of the most important interfaces and classes for streams. IMAGE ABDOC_Streaming.gif 654 503
Classes for Data Streams and Filter Streams The classes for data streams and filter streams are the templates for data stream objects and filter stream objects. The classes for the data stream category start with CL_ABAP_, followed by an ID resource for the resource that is used as a streaming data source or a streaming data sink. Currently, data streams are supported for the following resources:
LOBs in database tables; the associated resource ID is DB.
Strings; the associated resource ID is STRING.
Internal tables; the associated resource ID is ITAB. an ID type for the stream type. Here the IDs C and X are possible for the binary streams or character streams. an ID direction for the stream direction. Here the IDs READER and WRITER are possible for reader streams or writer streams. The classes for the filter stream category start with CL_ABAP_FILTER_, followed by the IDs type and direction with the same meanings as for data stream classes. Currently, no filter streams are implemented.
Interfaces and Superclasses All public methods of the data stream and filter stream classes are declared in interfaces which allow general access to the classes.
The IF_ABAP_direction interface enables general access to all reader and writer streams.
The IF_ABAP_TYPE_direction interface enables a type-dependent access to reader and writer streams.
The IF_ABAP_RESOURCE_direction interface enables resource-dependent access to reader and writer streams.
The IF_ABAP_CLOSE_RESOURCE interface contains the CLOSE method, which is required by all stream kinds in order to close an open resource. This also applies to filter streams, since these are usually connected to data streams and the resource can then only be closed using the filter stream. Data stream classes inherit CL_ABAP_TYPE_direction from abstract superclasses. In these classes, methods are implemented that are dependent on the stream type and stream direction but independent of the resource.
Important Methods In the case of data streams, the following methods BEGIN_SECTION VERSION 5 OUT are implemented as kernel methods END_SECTION VERSION 5 OUT . The actual access to the streaming data source or streaming data sink is completed by the ABAP runtime framework.
Methods for Reader Streams Methods from the interface IF_ABAP_READER:
DATA_AVAILABLE returns X if there is still data in the reader stream.
IS_X_READER returns X if it is a binary stream.
READ returns a string with a predefined number of bytes or characters from the reader stream.
SKIP skips a predefined number of bytes or characters from the reader stream.
Methods for Writer Streams Methods from the interface IF_ABAP_WRITER:
WRITE writes the content of a passed string to a writer stream.
Methods for Both Stream Categories Methods from the IF_ABAP_CLOSE_RESOURCE interface:
