Trying to invoke an expression rule with input parameter from my java plugin.

girikumard over 9 years ago

Trying to invoke an expression rule with input parameter from my java plugin.

Tried using evaluateExpression(java.lang.String expression, NamedTypedValue[] variableValues) method in ProcessDesignService Interface.But not able to construct variableValues of type NamedTypedValue[].

Do we have any sample code to pass a parameter to an expression rule from java ?

Thanks in Advance.

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0 abhi.jana
Appian Employee
over 9 years ago

Example using Appian's enumerate() function -

NamedTypedValue var = new NamedTypedValue();
var.setName("input");
var.setInstanceType(AppianTypeLong.INTEGER);
var.setValue(3);

List<NamedTypedValue> list = new ArrayList<NamedTypedValue>();
list.add(var);

NamedTypedValue[] inputs = new NamedTypedValue[list.size()];
list.toArray(inputs);

TypedValue result = new TypedValue();
try {
result = pds.evaluateExpression("=enumerate(!input)",inputs);
} catch (ExpressionEvaluationException e) {
e.printStackTrace();
}
System.out.println(result);
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0 abhi.jana
Appian Employee
over 9 years ago

Example using Appian's enumerate() function -

NamedTypedValue var = new NamedTypedValue();
var.setName("input");
var.setInstanceType(AppianTypeLong.INTEGER);
var.setValue(3);

List<NamedTypedValue> list = new ArrayList<NamedTypedValue>();
list.add(var);

NamedTypedValue[] inputs = new NamedTypedValue[list.size()];
list.toArray(inputs);

TypedValue result = new TypedValue();
try {
result = pds.evaluateExpression("=enumerate(!input)",inputs);
} catch (ExpressionEvaluationException e) {
e.printStackTrace();
}
System.out.println(result);
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