private SerializablePredicate<HString> generate(Expression e) {
if (e.isInstance(ValueExpression.class)) {
return s -> s.contains(e.as(ValueExpression.class).value);
} else if (e.isInstance(PrefixExpression.class)) {
PrefixExpression pe = e.as(PrefixExpression.class);
if (pe.operator.getType().isInstance(Types.NOT)) {
return negate(generate(pe.right));
} else if (pe.operator.getType().isInstance(Types.FIELD)) {
final AttributeType attributeType =
com.davidbracewell.hermes.Types.attribute(
pe.operator.getText().substring(1, pe.operator.getText().length() - 2));
final SerializablePredicate<HString> predicate = generate(pe.right);
return hString ->
hString.document().contains(attributeType)
&& predicate.test(
Fragments.string(hString.document().get(attributeType).asString()));
}
return generate(pe.right);
}
BinaryOperatorExpression boe = e.as(BinaryOperatorExpression.class);
SerializablePredicate<HString> left = generate(boe.left);
SerializablePredicate<HString> right = generate(boe.right);
return boe.operator.getType().isInstance(Operator.AND) ? and(left, right) : or(left, right);
}
SerializablePredicate<HString> or(
SerializablePredicate<HString> l, SerializablePredicate<HString> r) {
return (hString -> l.test(hString) || r.test(hString));
}
SerializablePredicate<HString> and(
SerializablePredicate<HString> l, SerializablePredicate<HString> r) {
return (hString -> l.test(hString) && r.test(hString));
}
SerializablePredicate<HString> negate(SerializablePredicate<HString> p) {
return (hString -> !p.test(hString));
}
