Examples of net.sf.saxon.sxpath.IndependentContext

net.sf.saxon.sxpath.IndependentContext
An IndependentContext provides a context for parsing an XPath expression appearing in a context other than a stylesheet.
This class is used in a number of places where freestanding XPath expressions occur. These include the native Saxon XPath API, the .NET XPath API, XPath expressions used in XML Schema identity constraints, and XPath expressions supplied to saxon:evaluate(). It is not used by the JAXP XPath API (though it shares code with that API through the common superclass AbstractStaticContext).

This class currently provides no mechanism for binding user-defined functions.


        PreparedExpression pexpr = new PreparedExpression();
        String exprText;
        if (operation == EVALUATE_NODE) {
            NodeInfo node = (NodeInfo)argument[0].evaluateItem(context);
            IndependentContext env = staticContext.copy();
            pexpr.expStaticContext = env;
            env.setBaseURI(node.getBaseURI());
            env.setFunctionLibrary(getExecutable().getFunctionLibrary());
            env.setNamespaces(node);
            exprText = node.getStringValue();
            UnfailingIterator single = SingletonIterator.makeIterator(node);
            single.next();
            context.setCurrentIterator(single);
            Expression expr;
            try {
                expr = ExpressionTool.make(exprText, env, 0, Token.EOF, 1, false);
                expr.setContainer(env);
            } catch (XPathException e) {
                String name = getFunctionName().getDisplayName();
                XPathException err = new XPathException("Static error in XPath expression supplied to " + name + ": " +
                        e.getMessage().trim());
                err.setXPathContext(context);
                throw err;
            }
            ItemType contextItemType = Type.ITEM_TYPE;
            ExpressionVisitor visitor = ExpressionVisitor.make(env);
            visitor.setExecutable(env.getExecutable());
            expr = visitor.typeCheck(expr, contextItemType);
            pexpr.stackFrameMap = env.getStackFrameMap();
            ExpressionTool.allocateSlots(expr, pexpr.stackFrameMap.getNumberOfVariables(), pexpr.stackFrameMap);
            pexpr.expression = expr;
            expr.setContainer(env);
            return pexpr;


        }


        AtomicValue exprSource = (AtomicValue)argument[0].evaluateItem(context);
        exprText = exprSource.getStringValue();
        IndependentContext env = staticContext.copy();
        env.setFunctionLibrary(getExecutable().getFunctionLibrary());
        pexpr.expStaticContext = env;
        pexpr.variables = new XPathVariable[10];
        for (int i=1; i<10; i++) {
            pexpr.variables[i-1] = env.declareVariable("", "p"+i);
        }


        Expression expr;
        try {
            expr = ExpressionTool.make(exprText, env, 0, Token.EOF, 1, false);
        } catch (XPathException e) {
            String name = getFunctionName().getDisplayName();
            XPathException err = new XPathException("Static error in XPath expression supplied to " + name + ": " +
                    e.getMessage().trim());
            err.setXPathContext(context);
            throw err;
        }
        ItemType contextItemType = Type.ITEM_TYPE;
        ExpressionVisitor visitor = ExpressionVisitor.make(env);
        visitor.setExecutable(env.getExecutable());
        expr = visitor.typeCheck(expr, contextItemType);
        pexpr.stackFrameMap = env.getStackFrameMap();
        ExpressionTool.allocateSlots(expr, pexpr.stackFrameMap.getNumberOfVariables(), pexpr.stackFrameMap);
        pexpr.expression = expr;
        expr.setContainer(env);


        return pexpr;

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        try {
            NamespaceBinding bindings = new NamespaceBinding(runtime,context);
            XPathCompiler xcomp = runtime.getProcessor().newXPathCompiler();
            xcomp.setBaseURI(context.getBaseURI());


            IndependentContext icontext = (IndependentContext) xcomp.getUnderlyingStaticContext();


            Hashtable<QName, RuntimeValue> inScopeOptions = new Hashtable<QName, RuntimeValue> ();
            try {
                inScopeOptions = ((XCompoundStep) forStep).getInScopeOptions();
            } catch (ClassCastException cce) {

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    {
      super.initTransformerFactory(factory);
      if (factory instanceof TransformerFactoryImpl)
      {
        Configuration configuration = ((TransformerFactoryImpl) factory).getConfiguration();
        XPathStaticContext xpathContext = new IndependentContext(configuration);
        if (!xpathContext.getFunctionLibrary().isAvailable(LineNumberFunction.QNAME, -1))
        {
          configuration.registerExtensionFunction(new LineNumberFunction());
        }
        if (!xpathContext.getFunctionLibrary().isAvailable(ColumnNumberFunction.QNAME, -1))
        {
          configuration.registerExtensionFunction(new ColumnNumberFunction());
        }
        if (!xpathContext.getFunctionLibrary().isAvailable(SystemIdFunction.QNAME, -1))
        {
          configuration.registerExtensionFunction(new SystemIdFunction());
        }
      }
    }

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