Example usage for javax.xml.xpath XPathExpression toString

Introduction

In this page you can find the example usage for javax.xml.xpath XPathExpression toString.

Prototype

public String toString() 

Source Link

Document

Returns a string representation of the object.

Usage

From source file:org.callimachusproject.rdfa.test.RDFaGenerationTest.java

XPathExpression conjoinXPaths(Document fragment, String base) throws Exception {
    String path = "//*";
    final Element e = fragment.getDocumentElement();
    if (e == null)
        return null;
    final XPathIterator conjunction = new XPathIterator(e, base);
    if (conjunction.hasNext()) {
        path += "[";
        boolean first = true;
        while (conjunction.hasNext()) {
            if (!first)
                path += " and ";
            XPathExpression x = conjunction.next();
            String exp = x.toString();
            boolean positive = true;
            if (exp.startsWith("-")) {
                positive = false;/*  ww w  .j a va2  s .c o  m*/
                exp = exp.substring(1);
            }
            // remove the initial '/'
            exp = exp.substring(1);
            if (positive)
                path += exp;
            else
                path += "not(" + exp + ")";
            first = false;
        }
        path += "]";
    }
    XPath xpath = xPathFactory.newXPath();
    // add namespace prefix resolver to the xpath based on the current element
    xpath.setNamespaceContext(new AbstractNamespaceContext() {
        public String getNamespaceURI(String prefix) {
            // for the empty prefix lookup the default namespace
            if (prefix.isEmpty())
                return e.lookupNamespaceURI(null);
            for (int i = 0; i < conjunction.contexts.size(); i++) {
                NamespaceContext c = conjunction.contexts.get(i);
                String ns = c.getNamespaceURI(prefix);
                if (ns != null)
                    return ns;
            }
            return null;
        }
    });
    final String exp = path;
    final XPathExpression compiled = xpath.compile(path);
    if (verbose)
        System.out.println(exp);

    return new XPathExpression() {
        public String evaluate(Object source) throws XPathExpressionException {
            return compiled.evaluate(source);
        }

        public String evaluate(InputSource source) throws XPathExpressionException {
            return compiled.evaluate(source);
        }

        public Object evaluate(Object source, QName returnType) throws XPathExpressionException {
            return compiled.evaluate(source, returnType);
        }

        public Object evaluate(InputSource source, QName returnType) throws XPathExpressionException {
            return compiled.evaluate(source, returnType);
        }

        public String toString() {
            return exp;
        }
    };
}

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From source file:org.callimachusproject.rdfa.test.RDFaGenerationTest.java

XPathExpression evaluateXPaths(XPathIterator iterator, Document doc) throws Exception {
    while (iterator.hasNext()) {
        XPathExpression exp = iterator.next();
        NodeList result = (NodeList) exp.evaluate(doc, XPathConstants.NODESET);
        boolean negativeTest = exp.toString().startsWith("-");
        int solutions = result.getLength();
        // a positive test should return exactly one solution
        boolean failure = ((solutions < 1 && !negativeTest)
                // a negative test should return no solutions
                || (solutions > 0 && negativeTest));
        if (failure)
            return exp; // fail
    }/*from w ww .  j a v a  2s.co  m*/
    return null;
}

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From source file:net.solarnetwork.support.XmlSupport.java

/**
 * Extract a String value via an XPath expression.
 * //w w  w  .  j av  a2  s  .c  om
 * @param xml
 *        the XML
 * @param xpath
 *        the XPath expression
 * @return the String
 */
public String extractStringFromXml(Node xml, XPathExpression xpath) {
    try {
        return (String) xpath.evaluate(xml, XPathConstants.STRING);
    } catch (XPathExpressionException e) {
        throw new RuntimeException("Unable to extract string from XPath [" + xpath.toString() + "]", e);
    }
}

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From source file:org.apache.openaz.xacml.std.StdRequestAttributes.java

@Override
public Node getContentNodeByXpathExpression(XPathExpression xpathExpression) {
    if (xpathExpression == null) {
        throw new NullPointerException("Null XPathExpression");
    }//from  ww  w  .j a va 2  s  .c o m
    Node nodeRootThis = this.getContentRoot();
    if (nodeRootThis == null) {
        return null;
    }
    Node matchingNode = null;
    try {
        matchingNode = (Node) xpathExpression.evaluate(nodeRootThis, XPathConstants.NODE);
    } catch (XPathExpressionException ex) {
        this.logger.warn("Failed to retrieve node for \"" + xpathExpression.toString() + "\"", ex);
    }
    return matchingNode;
}

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From source file:org.apache.openaz.xacml.std.StdRequestAttributes.java

@Override
public NodeList getContentNodeListByXpathExpression(XPathExpression xpathExpression) {
    if (xpathExpression == null) {
        throw new NullPointerException("Null XPathExpression");
    }//from  w  ww  .  ja  va2s  .  co  m
    Node nodeRootThis = this.getContentRoot();
    if (nodeRootThis == null) {
        return null;
    }
    NodeList matchingNodeList = null;
    try {
        matchingNodeList = (NodeList) xpathExpression.evaluate(nodeRootThis, XPathConstants.NODESET);
    } catch (XPathExpressionException ex) {
        this.logger.warn("Failed to retrieve nodelist for \"" + xpathExpression.toString() + "\"", ex);
    }
    return matchingNodeList;
}

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