Examples of org.pdf4j.saxon.expr.XPathContext

org.pdf4j.saxon.expr.XPathContext
This class represents a context in which an XPath expression is evaluated.

        }
    }


    public TailCall processLeavingTail(XPathContext context) throws XPathException {
        Controller controller = context.getController();
        XPathContext c2 = context;
//        XPathContext c2 = context.newMinorContext();
//        c2.setOrigin(this);
        SequenceReceiver out = c2.getReceiver();
        Item item = context.getContextItem();
        if (item == null) {
            // See spec bug 7624, test case copy903err
            XPathException err = new XPathException("Context item for xsl:copy is undefined", "XTTE0945");
            err.setLocator(this);
            throw err;
        }
        if (!(item instanceof NodeInfo)) {
            out.append(item, locationId, NodeInfo.ALL_NAMESPACES);
            return null;
        }
        NodeInfo source = (NodeInfo)item;
        //out.getPipelineConfiguration().setBaseURI(source.getBaseURI());


        // Processing depends on the node kind.


        switch(source.getNodeKind()) {


        case Type.ELEMENT:
            // use the generic code for creating new elements
            return super.processLeavingTail(c2);


        case Type.ATTRIBUTE:
            try {
                CopyOf.copyAttribute(source, getSchemaType(), validation, this, c2, false);
            } catch (NoOpenStartTagException err) {
                err.setXPathContext(context);
                throw dynamicError(this, err, c2);
            }
            break;


        case Type.TEXT:
            out.characters(source.getStringValueCS(), locationId, 0);
            break;


        case Type.PROCESSING_INSTRUCTION:
            out.processingInstruction(source.getDisplayName(), source.getStringValueCS(), locationId, 0);
            break;


        case Type.COMMENT:
            out.comment(source.getStringValueCS(), locationId, 0);
            break;


        case Type.NAMESPACE:
            try {
                source.copy(out, NodeInfo.NO_NAMESPACES, false, locationId);
            } catch (NoOpenStartTagException err) {
                XPathException e = new XPathException(err.getMessage());
                e.setXPathContext(context);
                e.setErrorCode(err.getErrorCodeLocalPart());
                throw dynamicError(this, e, context);
            }
            break;


        case Type.DOCUMENT:
            if (!preservingTypes) {
                Receiver val = controller.getConfiguration().
                        getDocumentValidator(out, source.getBaseURI(),
                                validation, Whitespace.NONE, getSchemaType(), -1);
                if (val != out) {
                    SequenceReceiver sr = new TreeReceiver(val);
                    sr.setPipelineConfiguration(out.getPipelineConfiguration());
                    c2.setReceiver(sr);
                    out = sr;
                }
            }
            out.startDocument(0);
            content.process(c2);

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     * the content
     */


    public Item evaluateItem(XPathContext context) throws XPathException {
        Controller controller = context.getController();
        XPathContext c2 = context.newMinorContext();
        c2.setOrigin(this);
        SequenceOutputter seq = controller.allocateSequenceOutputter(1);
        PipelineConfiguration pipe = controller.makePipelineConfiguration();
        pipe.setHostLanguage(getHostLanguage());
        seq.setPipelineConfiguration(pipe);
        c2.setTemporaryReceiver(seq);
        process(c2);
        seq.close();
        Item item = seq.getFirstItem();
        seq.reset();
        return item;

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     * pre-evaluation, or that need access to context information, can override this method.
     * @param visitor an expression visitor
     */


    public Expression preEvaluate(ExpressionVisitor visitor) throws XPathException {
        final XPathContext context = visitor.getStaticContext().makeEarlyEvaluationContext();
        return new StringLiteral(
            unicodeToString(argument[0].iterate(context), context));
    }

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     * of {@link ContextStackFrame}
     * @throws java.util.NoSuchElementException
     *          iteration has no more elements.
     */
    public Object next() {
        XPathContext context = next;
        if (context == null) {
            return null;
        }
        int construct = context.getOriginatingConstructType();
        Object origin = context.getOrigin();


        if (first) {
            // these constructs are only considered if they appear at the top of the stack
            if (construct == Location.FILTER_EXPRESSION ||
                    construct == Location.PATH_EXPRESSION ||
                    construct == Location.SORT_KEY ||
                    construct == Location.GROUPING_KEY) {


            } else {


            }
        }


        if (construct == Location.CONTROLLER) {
            next = context.getCaller();
            return new ContextStackFrame.CallingApplication();
        } else if (construct == Location.BUILT_IN_TEMPLATE) {
            next = context.getCaller();
            return new ContextStackFrame.BuiltInTemplateRule();
        }
//        InstructionInfo info;
//        if (origin instanceof Instruction) {
//            info = ((Instruction)origin);
//        } else {
//            next = context.getCaller();
//            return next();
//        }
        //System.err.println("Construct: " + construct);
        if (construct == Location.FUNCTION_CALL) {
            ContextStackFrame.FunctionCall sf = new ContextStackFrame.FunctionCall();
            UserFunctionCall ufc = (UserFunctionCall)origin;
            sf.setSystemId(ufc.getSystemId());
            sf.setLineNumber(ufc.getLineNumber());
            sf.setContainer(ufc.getContainer());
            sf.setFunctionName(ufc.getFunctionName());
            sf.setContextItem(context.getContextItem());
            next = context.getCaller();
            return sf;
        } else if (construct == StandardNames.XSL_APPLY_TEMPLATES) {
            ContextStackFrame.ApplyTemplates sf = new ContextStackFrame.ApplyTemplates();
            ApplyTemplates loc = (ApplyTemplates)origin;
            sf.setSystemId(loc.getSystemId());
            sf.setLineNumber(loc.getLineNumber());
            sf.setContainer(loc.getContainer());
            sf.setContextItem(context.getContextItem());
            next = context.getCaller();
            return sf;
        } else if (construct == StandardNames.XSL_CALL_TEMPLATE) {
            ContextStackFrame.CallTemplate sf = new ContextStackFrame.CallTemplate();
            CallTemplate loc = (CallTemplate)origin;
            sf.setSystemId(loc.getSystemId());
            sf.setLineNumber(loc.getLineNumber());
            sf.setContainer(loc.getContainer());
            sf.setTemplateName(loc.getObjectName());
            sf.setContextItem(context.getContextItem());
            next = context.getCaller();
            return sf;
        } else if (construct == StandardNames.XSL_VARIABLE) {
            ContextStackFrame.VariableEvaluation sf = new ContextStackFrame.VariableEvaluation();
            GeneralVariable var = ((GeneralVariable)origin);
            sf.setSystemId(var.getSystemId());
            sf.setLineNumber(var.getLineNumber());
            sf.setContainer(var.getContainer());
            sf.setContextItem(context.getContextItem());
            sf.setVariableName(var.getVariableQName());
            next = context.getCaller();
            return sf;
        } else if (construct == StandardNames.XSL_FOR_EACH) {
            ContextStackFrame.ForEach sf = new ContextStackFrame.ForEach();
            ForEach var = ((ForEach)origin);
            sf.setSystemId(var.getSystemId());
            sf.setLineNumber(var.getLineNumber());
            sf.setContainer(var.getContainer());
            sf.setContextItem(context.getContextItem());
            next = context.getCaller();
            return sf;
//        } else if (construct == Location.FILTER_EXPRESSION) {
//            out.println("    In predicate of filter expression");
//        } else if (construct == Location.PATH_EXPRESSION) {
//            out.println("    In step of path expression");
//        } else if (construct == Location.SORT_KEY) {
//            out.println("    In evaluation of sort key");
//        } else if (construct == Location.GROUPING_KEY) {
//            out.println("    In evaluation of grouping key");
        } else {
            //other context changes are not considered significant enough to report
            //out.println("    In unidentified location " + construct);
            next = context.getCaller();
            return next();
        }


    }

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            // probably redundant. It's the caller's job to set this flag, because there might be
            // a non-standard error listener in use.
        }


        if (exception instanceof XPathException) {
            XPathContext context = ((XPathException)exception).getXPathContext();
            if (context != null && doStackTrace && getRecoveryPolicy() != Configuration.RECOVER_SILENTLY) {
                printStackTrace(errorOutput, context);
            }
        }
    }

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                loc = err.getLocator();
            } else {
                return "";
            }
        }
        XPathContext context = null;
        if (err instanceof XPathException) {
            context = ((XPathException)err).getXPathContext();
        }
        return getLocationMessageText(loc, context);
    }

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                out.append(it, 0, NodeInfo.ALL_NAMESPACES);
            }
        } else {
            state = BUSY;
            Controller controller = context.getController();
            XPathContext c2 = savedXPathContext.newMinorContext();
            //c2.setOrigin(this);
            // Fork the output: one copy goes to a SequenceOutputter which remembers the contents for
            // use next time the variable is referenced; another copy goes to the current output destination.
            SequenceOutputter seq = controller.allocateSequenceOutputter(20);
            seq.setPipelineConfiguration(controller.makePipelineConfiguration());
            seq.open();
            TeeOutputter tee = new TeeOutputter(context.getReceiver(), seq);
            tee.setPipelineConfiguration(controller.makePipelineConfiguration());
            c2.setTemporaryReceiver(tee);


            expression.process(c2);


            seq.close();
            List list = seq.getList();

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     * @param visitor an expression visitor
     */


    public Expression preEvaluate(ExpressionVisitor visitor) throws XPathException {
        try {
            XPathContext early = visitor.getStaticContext().makeEarlyEvaluationContext();
            final Item item1 = argument[1].evaluateItem(early);
            final String lex = item1.getStringValue();
            final Item item0 = argument[0].evaluateItem(early);
            String uri;
            if (item0 == null) {

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      * or more groups, one for each value of the grouping key.
     */


    private void buildIndexedGroups() throws XPathException {
        HashMap index = new HashMap(40);
        XPathContext c2 = keyContext.newMinorContext();
        c2.setCurrentIterator(population);
        c2.setOriginatingConstructType(Location.GROUPING_KEY);
        while (true) {
            Item item = population.next();
            if (item==null) {
                break;
            }

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    public void close() {
    }


    public SequenceIterator getAnother() throws XPathException {
        XPathContext c2 = keyContext.newMinorContext();
        c2.setOriginatingConstructType(Location.GROUPING_KEY);
        return new GroupByIterator(population.getAnother(), keyExpression, c2, collator);
    }

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Related Classes of org.pdf4j.saxon.expr.XPathContext

org.pdf4j.saxon.functions.CodepointsToString

org.pdf4j.saxon.functions.QNameFn

org.pdf4j.saxon.instruct.Copy

org.pdf4j.saxon.sort.GroupByIterator

org.pdf4j.saxon.StandardErrorListener

org.pdf4j.saxon.trace.ContextStackIterator

org.pdf4j.saxon.value.MemoClosure

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