Examples of org.pdf4j.saxon.pattern.PatternSponsor

org.pdf4j.saxon.pattern.PatternSponsor
The PatternSponsor class allows a Pattern to be treated like an expression. Although patterns are not evaluated at run-time in the same way as expressions, they need to be manipulated in much the same way as expressions at compile time: for example variables need to be bound, dependencies need to be analyzed, and so on. This is especially true of patterns appearing in the xsl:number and xsl:for-each-group instructions (less so for the more common match patterns in xsl:template).
This class implements the Expression interface, so that an Expression can have a PatternSponsor as a subexpression; it wraps a Pattern.

A Pattern is treated as a boolean expression that returns true if the pattern matches the context node. However, it is not currently evaluated in that way.

        }
        if (lang != null) {
            lang = visitor.typeCheck(lang, contextItemType);
        }
        if (count != null) {
            visitor.typeCheck(new PatternSponsor(count), contextItemType);
        }
        if (from != null) {
            visitor.typeCheck(new PatternSponsor(from), contextItemType);
        }
        return this;
    }

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        }
        if (lang != null) {
            sub.add(lang);
        }
        if (count != null) {
            sub.add(new PatternSponsor(count));
        }
        if (from != null) {
            sub.add(new PatternSponsor(from));
        }
        return sub.iterator();
    }

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        } else if (groupAdjacent != null) {
            algorithm = ForEachGroup.GROUP_ADJACENT;
            key = groupAdjacent;
        } else if (starting != null) {
            algorithm = ForEachGroup.GROUP_STARTING;
            key = new PatternSponsor(starting);
        } else if (ending != null) {
            algorithm = ForEachGroup.GROUP_ENDING;
            key = new PatternSponsor(ending);
        }


//        Block action = new Block();
//        compileChildren(exec, action, true);
        Expression action = compileSequenceConstructor(exec, iterateAxis(Axis.CHILD), true);

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        ExpressionVisitor visitor = ExpressionVisitor.make(staticContext);
        pat.analyze(visitor, Type.NODE_TYPE);
        SlotManager map = staticContext.getStackFrameMap();
        int slots = map.getNumberOfVariables();
        slots = pat.allocateSlots(staticContext, map, slots);
        PatternSponsor sponsor = new PatternSponsor(pat);
        XPathExpression xpe = new XPathExpression(this, sponsor);
        xpe.setStackFrameMap(map, slots);
        return xpe;
    }

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     *
     * @return an iterator containing the sub-expressions of this expression
     */


    public Iterator iterateSubExpressions() {
        return new PatternSponsor(pattern).iterateSubExpressions();
    }

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Related Classes of org.pdf4j.saxon.pattern.PatternSponsor

org.pdf4j.saxon.expr.PatternMatchExpression

org.pdf4j.saxon.instruct.NumberInstruction

org.pdf4j.saxon.style.XSLForEachGroup

org.pdf4j.saxon.sxpath.XPathEvaluator

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