An example of a fixed record part with a substructured array is as follows:
Record myPart type basicRecord 10 MyTopStructure CHAR(20)[5]; 20 MyStructureItem01 CHAR(10); 20 MyStructureItem02 CHAR(10); end
Later descriptions refer to the wrapper classes for a given program as the program wrapper class, the parameter wrapper classes, the dynamic array wrapper classes, and the substructured-item-array wrapper classes.
EGL generates a BeanInfo class for each parameter wrapper class, dynamic array wrapper class, or substructured-item-array wrapper class. The BeanInfo class allows the related wrapper class to be used as a Java-compliant Java bean. You probably will not interact with the BeanInfo class.
When you generate a wrapper, the parameter list of the called program cannot include parameters of type BLOB, CLOB, STRING, Dictionary, ArrayDictionary, or non-fixed record.
import com.ibm.javart.v6.cso.*; public class MyNativeClass { /* declare a variable for middleware */ CSOPowerServer powerServer = null; try { powerServer = new CSOLocalPowerServerProxy(); } catch (CSOException exception) { System.out.println("Error initializing middleware" + exception.getMessage()); System.exit(8); } }
myProgram = new MyprogramWrapper(powerServer);
Mypart myParm = myProgram.getMyParm(); Mypart2 myParm2 = myProgram.getMyParm2();
myRecArrayVar myParm3 = myProgram.getMyParm3();
For details on interacting with dynamic arrays, see Dynamic array wrapper classes.
The userid and password are not used for database access.
myProgram.callOptions.setUserID("myID"); myProgram.callOptions.setPassword("myWord"); myUserID = myProgram.callOptions.getUserID(); myPassword = myProgram.callOptions.getPassword();
myProgram.execute();
powerServer.commit(); powerServer.rollback();
if (powerServer != null) { try { powerServer.close(); powerServer = null; } catch(CSOException error) { System.out.println("Error closing middleware" + error.getMessage()); System.exit(8); } }
The program wrapper class includes a private instance variable for each parameter in the generated program. If the parameter is a record or form, the variable refers to an instance of the related parameter wrapper class. If the parameter is a data item, the variable has a primitive Java type.
A table at the end of this help page describes the conversions between EGL and Java types.
purposeParmname()
setPassword(passWord) setUserid(userid) getPassword() getUserid()
The PropertyChange event is described in the JavaBean specification of Sun Microsystems, Inc.
Mypart myRecWrapperObject = myProgram.getMyrecord();
In this case, you are using the memory allocated by the program wrapper object.
You also can use the parameter wrapper class to declare memory, as is necessary if you invoke the call method (rather than the execute method) of the program object.
purposesiName()
purposesiNameNullIndicator()
ParameterClassname.ArrayClassName
Record CompanyPart type basicRecord 10 Departments CHAR(20)[5]; 20 CountryCode CHAR(10); 20 FunctionCode CHAR(10)[3]; 30 FunctionCategory CHAR(4); 30 FunctionDetail CHAR(6); end
If the parameter Company is based on CompanyPart, you use the string CompanyPart.Departments as the name of the inner class.
An inner class of an inner class extends use of a dotted syntax. In this example, you use the symbol CompanyPart.Departments.Functioncode as the name of the inner class of Departments.
For additional details on how the substructured-item-array wrapper classes are named, see Output of Java wrapper generation.
Program myProgram(intParms int[], recParms MyRec[])
The name of the dynamic array wrapper classes are IntParmsArray and MyRecArray.
IntParmsArray myIntArrayVar = myProgram.getIntParms(); MyRecArray myRecArrayVar = myProgram.getRecParms();
After declaring the variables for each dynamic array, you might add elements:
// adding to an array of Java primitives // is a one-step process myIntArrayVar.add(new Integer(5)); // adding to an array of records or forms // requires multiple steps; in this case, // begin by allocating a new record object MyRec myLocalRec = (MyRec)myRecArrayVar.makeNewElement(); // the steps to assign values are not shown // in this example; but after you assign values, // add the record to the array myRecArrayVar.add(myLocalRec); // next, run the program myProgram.execute(); // when the program returns, you can determine // the number of elements in the array int myIntArrayVarSize = myIntArrayVar.size(); // get the first element of the integer array // and cast it to an Integer object Integer firstIntElement = (Integer)myIntArrayVar.get(0); // get the second element of the record array // and cast it to a MyRec object MyRec secondRecElement = (MyRec)myRecArrayVar.get(1);
As suggested by that example, EGL provides several methods for manipulating the variables that you declared.
Method of the dynamic array class | Purpose |
---|---|
add(int, Object) | To insert an object at the position specified by int and to shift the current and subsequent elements to the right. |
add(Object) | To append an object to the end of the dynamic array. |
addAll(ArrayList) | To append an ArrayList to the end of the dynamic array. |
get() | To retrieve the ArrayList object that contains all elements in the array |
get(int) | To retrieve the element that is in the position specified by int |
makeNewElement() | To allocate a new element of the array-specific type and to retrieve that element, without adding that element to the dynamic array. |
maxSize() | To retrieve an integer that indicates the maximum (but not actual) number of elements in the dynamic array |
remove(int) | To remove the element that is in the position specified by int |
set(ArrayList) | To use the specified ArrayList as a replacement for the dynamic array |
set(int, Object) | To use the specified object as a replacement for the element that is in the position specified by int |
size() | To retrieve the number of elements that are in the dynamic array |
The next table indicates the relationship of EGL primitive types in the generated program and the Java data types in the generated wrapper.
EGL primitive type | Length in chars or digits | Length in bytes | Decimals | Java data type | Maximum precision in Java |
---|---|---|---|---|---|
CHAR | 1-32767 | 2-32766 | NA | String | NA |
DBCHAR | 1-16383 | 1-32767 | NA | String | NA |
MBCHAR | 1-32767 | 1-32767 | NA | String | NA |
UNICODE | 1-16383 | 2-32766 | NA | String | NA |
HEX | 2-75534 | 1-32767 | NA | byte[] | NA |
BIN, SMALLINT | 4 | 2 | 0 | short | 4 |
BIN, INT | 9 | 4 | 0 | int | 9 |
BIN, BIGINT | 18 | 8 | 0 | long | 18 |
BIN | 4 | 2 | >0 | float | 4 |
BIN | 9 | 4 | >0 | double | 15 |
BIN | 18 | 8 | >0 | double | 15 |
DECIMAL, PACF | 1-3 | 1-2 | 0 | short | 4 |
DECIMAL, PACF | 4-9 | 3-5 | 0 | int | 9 |
DECIMAL, PACF | 10-18 | 6-10 | 0 | long | 18 |
DECIMAL, PACF | 1-5 | 1-3 | >0 | float | 6 |
DECIMAL, PACF | 7-18 | 4-10 | >0 | double | 15 |
NUM, NUMC | 1-4 | 1-4 | 0 | short | 4 |
NUM, NUMC | 5-9 | 5-9 | 0 | int | 9 |
NUM, NUMC | 10-18 | 10-18 | 0 | long | 18 |
NUM, NUMC | 1-6 | 1-6 | >0 | float | 6 |
NUM, NUMC | 7-18 | 7-18 | >0 | double | 15 |
Related concepts
Java wrapper
Runtime configurations
Related tasks
Generating Java wrappers