Examples of org.pdf4j.saxon.type.TypeHierarchy$ItemTypePair

org.pdf4j.saxon.type.TypeHierarchy
This class exists to provide answers to questions about the type hierarchy. Because such questions are potentially expensive, it caches the answers. There is one instance of this class for a Configuration.

        if ((operand0 instanceof Literal) && (operand1 instanceof Literal)) {
            return Literal.makeLiteral(
                    (AtomicValue)evaluateItem(env.makeEarlyEvaluationContext()));
        }


        final TypeHierarchy th = env.getConfiguration().getTypeHierarchy();
        ItemType type0 = operand0.getItemType(th);
        ItemType type1 = operand1.getItemType(th);


        if (type0.isAtomicType()) {
            atomize0 = false;
        }
        if (type1.isAtomicType()) {
            atomize1 = false;
        }


        if (th.relationship(type0, BuiltInAtomicType.BOOLEAN) == TypeHierarchy.DISJOINT) {
            maybeBoolean0 = false;
        }
        if (th.relationship(type1, BuiltInAtomicType.BOOLEAN) == TypeHierarchy.DISJOINT) {
            maybeBoolean1 = false;
        }


        if (!maybeBoolean0 && !maybeBoolean1) {
            int n0 = th.relationship(type0, BuiltInAtomicType.NUMERIC);
            int n1 = th.relationship(type1, BuiltInAtomicType.NUMERIC);
            boolean maybeNumeric0 = (n0 != TypeHierarchy.DISJOINT);
            boolean maybeNumeric1 = (n1 != TypeHierarchy.DISJOINT);
            boolean numeric0 = (n0 == TypeHierarchy.SUBSUMED_BY || n0 == TypeHierarchy.SAME_TYPE);
            boolean numeric1 = (n1 == TypeHierarchy.SUBSUMED_BY || n1 == TypeHierarchy.SAME_TYPE);
            // Use the 2.0 path if we don't have to deal with the possibility of boolean values,

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     * Perform type analysis
     */


    public Expression typeCheck(ExpressionVisitor visitor, ItemType contextItemType) throws XPathException {


        final TypeHierarchy th = visitor.getConfiguration().getTypeHierarchy();
        if (state >= 2) {
            // we've already done the main analysis, and we don't want to do it again because
            // decisions on sorting get upset. But we have new information, namely the contextItemType,
            // so we use that to check that it's a node
            setStartExpression(visitor.typeCheck(start, contextItemType));

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        // TODO: recognize explosive path expressions such as ..//../..//.. : eliminate duplicates early to contain the size
        // Mainly for benchmarks, but one sees following-sibling::p/preceding-sibling::h2. We could define an expression as
        // explosive if it contains two adjacent steps with opposite directions (except where both are singletons).


        final TypeHierarchy th = visitor.getConfiguration().getTypeHierarchy();
        if (state >= 3) {
            // we've already done the main analysis, and we don't want to do it again because
            // decisions on sorting get upset. But we have new information, namely the contextItemType,
            // so we use that to check that it's a node
            setStartExpression(visitor.optimize(start, contextItemType));

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