public FunctionArgument evaluate(XACMLEvalContext pip) throws XACML3EntitlementException {
int args = getArgCount();
if (args < 2) {
throw new IndeterminateException(
"Function Requires at least 2 arguments, " + "however " + getArgCount() + " in stack.");
}
// Create our union DataBag from other Bags.
DataBag unionBag = new DataBag();
// Iterate Over All DataBag's in Stack, Evaluate and create a Union of all Bags with Unique
// Objects.
try {
for (int i = 0; i < args; i++) {
DataBag bag = (DataBag) getArg(i).doEvaluate(pip);
if (bag == null) {
continue;
}
// Set our Union Data Bag with First Bag's Data Type and check subsequent Bags.
if (i == 0) {
unionBag.setType(bag.getType());
} else {
// Verify our Data Type with First Data Bag's Data Type.
if (bag.getType().getIndex() != unionBag.getType().getIndex()) {
throw new IndeterminateException(
"First Bag Type: "
+ unionBag.getType().getTypeName()
+ ", however a subsequent Bag Type was "
+ bag.getType().getTypeName());
}
}
// Iterate over the current Bag.
for (int b = 0; b < bag.size(); b++) {
DataValue dataValue = (DataValue) bag.get(b).doEvaluate(pip);
boolean contained = false;
for (int z = 0; z < unionBag.size(); z++) {
// Apply the Typed Equal Function to determine if
// the object already exists in the Union Bag.
TimeEqual fEquals = new TimeEqual();
fEquals.addArgument(unionBag.get(z));
fEquals.addArgument(dataValue);
FunctionArgument result = fEquals.doEvaluate(pip);
if (result.isTrue()) {
contained = true;
break;
}
}
// Add the Object if not contained.
if (!contained) {
// Add the Unique DataValue Element into the Union Bag.
unionBag.add(dataValue);
}
} // End of Inner For Loop.
} // End of Outer For Loop.
} catch (Exception e) {
throw new IndeterminateException("Iterating over Arguments Exception: " + e.getMessage());
}
// Return our UnionBag Value.
return unionBag;
}
