@Test
public void testPrependToProtectedList() throws SyntaxException, InvalidTermException {
Context context = new CompileTimeContext();
// Create a protected resource.
ListResource list = new ListResource();
list = (ListResource) list.protect();
Element value = StringProperty.getInstance("OK");
Operation dml = Prepend.getInstance(null, list, value);
Element result = context.executeDmlBlock(dml);
// Check that the list argument has NOT been updated.
assertTrue(list.size() == 0);
// Verify that a copy has been made.
assertTrue(result != list);
// It must also be a list.
assertTrue(result instanceof ListResource);
// Verify that the new list has the correct value.
Element element = ((ListResource) result).get(TermFactory.create(0));
assertTrue(value == element);
}
@Test
public void testNoIterations() throws SyntaxException {
// Create the loop.
Operation op =
new Foreach(
null,
new SetValue(null, "k", new Operation[] {}),
new SetValue(null, "v", new Operation[] {}),
new HashResource(),
BooleanProperty.TRUE);
// Run the operation.
Context context = new CompileTimeContext();
Element r1 = op.execute(context);
// Check the value.
assertTrue(r1 instanceof Undef);
// Check side-effects of the loop.
Element k = context.getLocalVariable("k");
Element v = context.getLocalVariable("v");
assertTrue(k instanceof Undef);
assertTrue(v instanceof Undef);
}
@Test
public void testPrependToList() throws SyntaxException, InvalidTermException {
Context context = new CompileTimeContext();
ListResource list = new ListResource();
Element value = StringProperty.getInstance("OK");
Operation dml = Prepend.getInstance(null, list, value);
Element result = context.executeDmlBlock(dml);
// Check that the list argument has been updated.
assertTrue(list.size() == 1);
Element element = list.get(TermFactory.create(0));
assertTrue(value == element);
// Verify that the same list is given as the result.
assertTrue(result == list);
}
private static Element runDefaultDml(Operation dml) throws SyntaxException {
// If the argument is null, return null as the value immediately.
if (dml == null) {
return null;
}
// Create a nearly empty execution context. There are no global
// variables by default (including no 'self' variable). Only the
// standard built-in functions are accessible.
Context context = new CompileTimeContext();
Element value = null;
// IF this is an AbstractOperation, pull out the source location.
SourceRange sourceRange = null;
if (dml instanceof AbstractOperation) {
AbstractOperation op = (AbstractOperation) dml;
sourceRange = op.getSourceRange();
}
// Execute the DML block. The block must evaluate to an Element. Any
// error is fatal for the compilation.
try {
value = context.executeDmlBlock(dml);
} catch (EvaluationException ee) {
SyntaxException se = SyntaxException.create(sourceRange, MSG_DEF_VALUE_NOT_CONSTANT);
se.initCause(ee);
throw se;
}
// The default value cannot be either undef or null. Throw a syntax
// error if that is the case.
if (value instanceof Undef) {
throw SyntaxException.create(sourceRange, MSG_DEF_VALUE_CANNOT_BE_UNDEF);
} else if (value instanceof Null) {
throw SyntaxException.create(sourceRange, MSG_DEF_VALUE_CANNOT_BE_UNDEF);
}
// Looks Ok; return the value.
return value;
}
@Override
public Element execute(Context context) {
// Look up the variable.
Element result = context.getVariable(identifier);
// Return an error if the variable doesn't exist.
if (result == null && !lookupOnly) {
throw new EvaluationException(
MessageUtils.format(MSG_UNDEFINED_VAR, identifier), sourceRange, context);
}
return result;
}
