Example of polymorphic behavior

It is presented here without the terminal IO requests. See C++ sample programs.

#include "icceh.hpp"
#include "iccmain.hpp"
char* dataItems[] =
{
"Hello World - item 1",
"Hello World - item 2",
"Hello World - item 3"
};
void IccUserControl::run()
{

Here we include Foundation Class headers and the main function. dataItems contains some sample data items. We write our application code in the run method of IccUserControl class.

 IccBuf buffer( 50 );
IccResource* pObj[2];

We create an IccBuf object (50 bytes initially) to hold our data items. An array of two pointers to IccResource objects is declared.

 pObj[0] = new IccDataQueue("ICCQ");
pObj[1] = new IccTempStore("ICCTEMPS");

We create two objects whose classes are derived from IccResource – IccDataQueue and IccTempStore.

 for ( short index=0; index <= 1 ; index++ )
{
pObj[index]->clear();
}

For both objects we invoke the clear method. This is handled differently by each object in a way that is transparent to the application program; this is polymorphic behavior.

 for ( index=0; index <= 1 ; index++ )
{
for (short j=1 ; j <= 3 ; j++)
{
buffer = dataItems[j-1];
pObj[index]->put( buffer );
}
}

Now we put three data items in each of our resource objects. Again the put method responds to the request in a way that is appropriate to the object type.

 for ( index=0; index <= 1 ; index++ )
{
buffer = pObj[index]->get();
while (pObj[index]->condition() == IccCondition::NORMAL)
{
buffer = pObj[index]->get();
}
delete pObj[index];
}
return;
}

The data items are read back in from each of our resource objects using the get method. We delete the resource objects and return control to CICS®.