Examples of javax.xml.xpath.XPathExpression.evaluate()

javax.xml.xpath.XPathExpression.evaluate()

Evaluate the compiled XPath expression in the specified context and return the result as the specified type.

See Evaluation of XPath Expressions for context item evaluation, variable, function and QName resolution and return type conversion.

If returnType is not one of the types defined in {@link XPathConstants}, then an IllegalArgumentException is thrown.

If a null value is provided for item, an empty document will be used for the context. If returnType is null, then a NullPointerException is thrown.
@param item The starting context (node or node list, for example). @param returnType The desired return type. @return The Object that is the result of evaluating the expression and converting the result toreturnType. @throws XPathExpressionException If the expression cannot be evaluated. @throws IllegalArgumentException If returnType is not one of the types defined in {@link XPathConstants}. @throws NullPointerException If returnType is null.


    private static void addApplicablePolicySets(PolicySet policySet,
                                         Document doc,
                                         int prefixCount) throws XPathExpressionException {
        XPathExpression expression = policySet.getAppliesToXPathExpression();
        NodeList result = (NodeList)expression.evaluate(doc, XPathConstants.NODESET);


        if (result != null) {
            for (int counter = 0; counter < result.getLength(); ++counter) {
                Node aResultNode = result.item(counter);

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            Document doc = builder.parse(new ByteArrayInputStream(rateTable.getBytes()));
            Node node = doc.getDocumentElement();
            XPath path = XPathFactory.newInstance().newXPath();
            XPathExpression exp = path.compile("/TABLE/TR[TD[1]='" + currency.toUpperCase() + "']/TD[2]");
            Node rateNode = (Node)exp.evaluate(node, XPathConstants.NODE);
            double rate = Double.valueOf(rateNode.getTextContent().trim());
            System.out.println("Exchange rate: USD 1.0=" + currency + " " + rate);
            return rate;
        } catch (Exception e) {
            throw new ServiceRuntimeException(e);

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                document = getDocument(exchange, body);
            }
            // fetch all namespaces
            if (document instanceof InputSource) {
                InputSource inputSource = (InputSource) document;
                answer = (NodeList) xpathExpression.evaluate(inputSource, XPathConstants.NODESET);
            } else if (document instanceof DOMSource) {
                DOMSource source = (DOMSource) document;
                answer = (NodeList) xpathExpression.evaluate(source.getNode(), XPathConstants.NODESET);
            } else {
                answer = (NodeList) xpathExpression.evaluate(document, XPathConstants.NODESET);

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            if (document instanceof InputSource) {
                InputSource inputSource = (InputSource) document;
                answer = (NodeList) xpathExpression.evaluate(inputSource, XPathConstants.NODESET);
            } else if (document instanceof DOMSource) {
                DOMSource source = (DOMSource) document;
                answer = (NodeList) xpathExpression.evaluate(source.getNode(), XPathConstants.NODESET);
            } else {
                answer = (NodeList) xpathExpression.evaluate(document, XPathConstants.NODESET);
            }
        } catch (Exception e) {
            LOG.trace("Unable to trace discovered namespaces in XPath expression", e);

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                answer = (NodeList) xpathExpression.evaluate(inputSource, XPathConstants.NODESET);
            } else if (document instanceof DOMSource) {
                DOMSource source = (DOMSource) document;
                answer = (NodeList) xpathExpression.evaluate(source.getNode(), XPathConstants.NODESET);
            } else {
                answer = (NodeList) xpathExpression.evaluate(document, XPathConstants.NODESET);
            }
        } catch (Exception e) {
            LOG.trace("Unable to trace discovered namespaces in XPath expression", e);
        } finally {
            // IOHelper can handle if is is null

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                document = getDocument(exchange, body);
            }
            // fetch all namespaces
            if (document instanceof InputSource) {
                InputSource inputSource = (InputSource) document;
                answer = (NodeList) xpathExpression.evaluate(inputSource, XPathConstants.NODESET);
            } else if (document instanceof DOMSource) {
                DOMSource source = (DOMSource) document;
                answer = (NodeList) xpathExpression.evaluate(source.getNode(), XPathConstants.NODESET);
            } else {
                answer = (NodeList) xpathExpression.evaluate(document, XPathConstants.NODESET);

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            if (document instanceof InputSource) {
                InputSource inputSource = (InputSource) document;
                answer = (NodeList) xpathExpression.evaluate(inputSource, XPathConstants.NODESET);
            } else if (document instanceof DOMSource) {
                DOMSource source = (DOMSource) document;
                answer = (NodeList) xpathExpression.evaluate(source.getNode(), XPathConstants.NODESET);
            } else {
                answer = (NodeList) xpathExpression.evaluate(document, XPathConstants.NODESET);
            }
        } catch (Exception e) {
            LOG.warn("Unable to trace discovered namespaces in XPath expression", e);

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                answer = (NodeList) xpathExpression.evaluate(inputSource, XPathConstants.NODESET);
            } else if (document instanceof DOMSource) {
                DOMSource source = (DOMSource) document;
                answer = (NodeList) xpathExpression.evaluate(source.getNode(), XPathConstants.NODESET);
            } else {
                answer = (NodeList) xpathExpression.evaluate(document, XPathConstants.NODESET);
            }
        } catch (Exception e) {
            LOG.warn("Unable to trace discovered namespaces in XPath expression", e);
        } finally {
            // IOHelper can handle if is is null

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      XPathFactory xFactory = XPathFactory.newInstance();
      XPath xpath = xFactory.newXPath();
      XPathExpression expr = xpath.compile("/projectDescription/name/text()");
      
      return (String) expr.evaluate(doc, XPathConstants.STRING);
      
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }

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      XPath xpath = factory.newXPath();


      xpath.setNamespaceContext(new OlefNamespaceContext());


      XPathExpression expr = xpath.compile(xpathExpression);
      Object obj = expr.evaluate(doc, returnType);
      result = obj;
    } catch (XPathExpressionException e) {
      e.printStackTrace();
    }
    return result;

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