a2 = a2.dereference();
if (a2.isVariable()) {
throw new PInstantiationException(this, 2);
}
if (!a2.isSymbol()) {
throw new IllegalTypeException(this, 2, "character", a2);
}
// S_or_a
a1 = a1.dereference();
if (a1.isVariable()) {
throw new PInstantiationException(this, 1);
} else if (a1.isSymbol()) {
if (!engine.getStreamManager().containsKey(a1)) {
throw new ExistenceException(this, 1, "stream", a1, "");
}
stream = ((JavaObjectTerm) engine.getStreamManager().get(a1))
.object();
} else if (a1.isJavaObject()) {
stream = ((JavaObjectTerm) a1).object();
} else {
throw new IllegalDomainException(this, 1, "stream_or_alias", a1);
}
if (!(stream instanceof PrintWriter)) {
throw new PermissionException(this, "output", "stream", a1, "");
}
// print single character
str = ((SymbolTerm) a2).name();
if (str.length() != 1) {
throw new IllegalTypeException(this, 2, "character", a2);
}
c = str.charAt(0);
if (!Character.isDefined(c)) {
throw new RepresentationException(this, 2, "character");
}