Examples of javax.xml.xpath.XPathFunctionResolver

javax.xml.xpath.XPathFunctionResolver
3.org/TR/xmldsig-core/">XML-Signature Syntax and Processing which extend the function library of XPath 1.0 in the same namespace. This is a consequence of the design of the resolver.

If you wish to implement additional built-in functions, you will have to extend the underlying implementation directly.
@author Norman Walsh @author Jeff Suttor @version $Revision: 226183 $, $Date: 2005-04-08 06:39:14 -0400 (Fri, 08 Apr 2005) $ @see XML Path Language (XPath) Version 1.0, Core Function Library @since 1.5

        } catch (Throwable e) {
            log.debug("Could not find Xalan on the classpath so ignoring this test case: " + e);
        }


        if (instance instanceof XPathFunctionResolver) {
            XPathFunctionResolver functionResolver = (XPathFunctionResolver)instance;


            XPathBuilder builder = xpath("java:" + getClass().getName() + ".func(string(/header/value))").namespace("java", "http://xml.apache.org/xalan/java").functionResolver(functionResolver);


            String xml = "<header><value>12</value></header>";
            Object value = assertExpression(builder, xml, "modified12");

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        xPath.setNamespaceContext(getNamespaceContext());


        xPath.setXPathVariableResolver(variableResolver);


        XPathFunctionResolver parentResolver = getFunctionResolver();
        if (parentResolver == null) {
            parentResolver = xPath.getXPathFunctionResolver();
        }
        xPath.setXPathFunctionResolver(createDefaultFunctionResolver(parentResolver));
        return xPath.compile(text);

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            }
        }
    }


    protected XPathFunctionResolver createDefaultFunctionResolver(final XPathFunctionResolver parent) {
        return new XPathFunctionResolver() {
            public XPathFunction resolveFunction(QName qName, int argumentCount) {
                XPathFunction answer = null;
                if (parent != null) {
                    answer = parent.resolveFunction(qName, argumentCount);
                }

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        // we may not have Xalan on the classpath
        try {
            instance = Class.forName("org.apache.xalan.extensions.XPathFunctionResolverImpl").newInstance();


            if (instance instanceof XPathFunctionResolver) {
                XPathFunctionResolver functionResolver = (XPathFunctionResolver)instance;
    
                XPathBuilder builder = xpath("java:" + getClass().getName() + ".func(string(/header/value))").namespace("java", "http://xml.apache.org/xalan/java").functionResolver(functionResolver);
    
                String xml = "<header><value>12</value></header>";
                Object value = assertExpression(builder, xml, "modified12");

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            LOG.trace("Creating new XPath expression in pool. Namespaces on XPath expression: {}", getNamespaceContext().toString());
        }
        xPath.setNamespaceContext(getNamespaceContext());
        xPath.setXPathVariableResolver(getVariableResolver());


        XPathFunctionResolver parentResolver = getFunctionResolver();
        if (parentResolver == null) {
            parentResolver = xPath.getXPathFunctionResolver();
        }
        xPath.setXPathFunctionResolver(createDefaultFunctionResolver(parentResolver));
        return xPath.compile(text);

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            }
        }
    }


    protected XPathFunctionResolver createDefaultFunctionResolver(final XPathFunctionResolver parent) {
        return new XPathFunctionResolver() {
            public XPathFunction resolveFunction(QName qName, int argumentCount) {
                XPathFunction answer = null;
                if (parent != null) {
                    answer = parent.resolveFunction(qName, argumentCount);
                }

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            LOG.info("Creating new XPath expression in pool. Namespaces on XPath expression: {}", getNamespaceContext().toString());
        }
        xPath.setNamespaceContext(getNamespaceContext());
        xPath.setXPathVariableResolver(getVariableResolver());


        XPathFunctionResolver parentResolver = getFunctionResolver();
        if (parentResolver == null) {
            parentResolver = xPath.getXPathFunctionResolver();
        }
        xPath.setXPathFunctionResolver(createDefaultFunctionResolver(parentResolver));
        return xPath.compile(text);

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            }
        }
    }


    protected XPathFunctionResolver createDefaultFunctionResolver(final XPathFunctionResolver parent) {
        return new XPathFunctionResolver() {
            public XPathFunction resolveFunction(QName qName, int argumentCount) {
                XPathFunction answer = null;
                if (parent != null) {
                    answer = parent.resolveFunction(qName, argumentCount);
                }

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        // we may not have Xalan on the classpath
        try {
            instance = Class.forName("org.apache.xalan.extensions.XPathFunctionResolverImpl").newInstance();


            if (instance instanceof XPathFunctionResolver) {
                XPathFunctionResolver functionResolver = (XPathFunctionResolver)instance;
    
                XPathBuilder builder = xpath("java:" + getClass().getName() + ".func(string(/header/value))").namespace("java", "http://xml.apache.org/xalan/java").functionResolver(functionResolver);
    
                String xml = "<header><value>12</value></header>";
                Object value = assertExpression(builder, xml, "modified12");

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        // we may not have Xalan on the classpath
        try {
            instance = Class.forName("org.apache.xalan.extensions.XPathFunctionResolverImpl").newInstance();


            if (instance instanceof XPathFunctionResolver) {
                XPathFunctionResolver functionResolver = (XPathFunctionResolver)instance;
    
                XPathBuilder builder = xpath("java:" + getClass().getName() + ".func(string(/header/value))").namespace("java", "http://xml.apache.org/xalan/java").functionResolver(functionResolver);
    
                String xml = "<header><value>12</value></header>";
                Object value = assertExpression(builder, xml, "modified12");

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