Examples of client.net.sf.saxon.ce.pattern.CombinedNodeTest

client.net.sf.saxon.ce.pattern.CombinedNodeTest
A CombinedNodeTest combines two nodetests using one of the operators union (=or), intersect (=and), difference (= "and not"). This arises when optimizing a union (etc) of two path expressions using the same axis. A CombinedNodeTest is also used to support constructs such as element(N,T), which can be expressed as (element(N,*) AND element(*,T)) @author Michael H. Kay

        if (operand0 instanceof AxisExpression && operand1 instanceof AxisExpression) {
            final AxisExpression a1 = (AxisExpression)operand0;
            final AxisExpression a2 = (AxisExpression)operand1;
            if (a1.getAxis() == a2.getAxis()) {
                AxisExpression ax = new AxisExpression(a1.getAxis(),
                             new CombinedNodeTest(a1.getNodeTest(),
                                                  operator,
                                                  a2.getNodeTest()));
                ExpressionTool.copyLocationInfo(this, ax);
                return ax;
            }

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        ItemType operandType = operand.getItemType(th);
        int relationship = th.relationship(requiredItemType, operandType);
        switch (relationship) {
            case TypeHierarchy.OVERLAPS:
                if (requiredItemType instanceof NodeTest && operandType instanceof NodeTest) {
                    return new CombinedNodeTest((NodeTest)requiredItemType, Token.INTERSECT, (NodeTest)operandType);
                } else {
                    // we don't know how to intersect atomic types, it doesn't actually happen
                    return requiredItemType;
                }

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Related Classes of client.net.sf.saxon.ce.pattern.CombinedNodeTest

client.net.sf.saxon.ce.expr.ItemChecker

client.net.sf.saxon.ce.expr.VennExpression

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