Examples of org.apache.synapse.util.xpath.SynapseXPath

org.apache.synapse.util.xpath.SynapseXPath

XPath that has been used inside Synapse xpath processing. This has a extension function named get-property which is use to retrieve message context properties with the given name from the function

For example the following function get-property('prop') can be evaluatedd using an XPath to retrieve the message context property value with the name prop.

Apart from that this XPath has a certain set of XPath variables associated with it. They are as follows;

body

The SOAP 1.1 or 1.2 body element.

header

The SOAP 1.1 or 1.2 header element.

Also there are some XPath prefixes defined in SynapseXPath to access various properties using XPath variables, where the variable name represents the particular prefix and the property name as the local part of the variable. Those variables are;

ctx

Prefix for Synapse MessageContext properties

axis2

Prefix for Axis2 MessageContext properties

trp

Prefix for the transport headers

This XPath is Thread Safe, and provides a special set of evaluate functions for the MessageContext and SOAPEnvelope as well as a method to retrieve string values of the evaluated XPaths
@see org.apache.axiom.om.xpath.AXIOMXPath @see #getContext(Object) @see org.apache.synapse.util.xpath.SynapseXPathFunctionContext @see org.apache.synapse.util.xpath.SynapseXPathVariableContext

        if (attKey != null) {
            String attributeValue = attKey.getAttributeValue();
            boolean hasEscape = isEscapedExpression(attributeValue);
            if (!hasEscape && isDynamicKey(attributeValue)) {
                /** dynamic key */
                SynapseXPath synXpath = createSynXpath(elem, attributeValue);
                key = new Value(synXpath);
            } else if (hasEscape) {
                /** escaped expr */
                key = new Value(getEscapedExpression(attributeValue));
                key.setNamespaces(elem);

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     */
    public SynapseXPath createSynXpath(OMElement elem, String key) {
        //derive XPath Expression from key
        String xpathExpr = key.trim().substring(1, key.length() - 1);


        SynapseXPath synapseXPath = null;


        try {
            synapseXPath = SynapseXPathFactory.getSynapseXPath(elem, xpathExpr);
        } catch (JaxenException e) {
            handleException("Can not create Synapse Xpath from given key");

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    public BaseXPath createXPath(String xpath, Collection<OMNamespace> omNameSpaces) {
        if (xpath == null || "".equals(xpath)) {
            throw new LoggedRuntimeException("XPath expression is null or empty", log);
        }
        try {
            SynapseXPath synapseXPath = new SynapseXPath(xpath);
            for (OMNamespace omNamespace : omNameSpaces) {
                if (omNamespace != null) {
                    synapseXPath.addNamespace(omNamespace.getPrefix(), omNamespace.getNamespaceURI());
                }
            }
            return synapseXPath;
        } catch (JaxenException e) {
            throw new LoggedRuntimeException("Invalid XPapth expression : " +

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                SendMediator send = new SendMediator();
                LoadbalanceEndpoint lb = new LoadbalanceEndpoint();


                FilterMediator filterMediator = new FilterMediator();
                in.addChild(filterMediator);
                SynapseXPath xpath = new SynapseXPath("get-property('To')");
                filterMediator.setSource(xpath);
                filterMediator.setRegex(Pattern.compile("/carbon"));


                PropertyMediator httpSCProperty = new PropertyMediator();
                httpSCProperty.setName("HTTP_SC");

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    private SynapseXPath getXPath(OMElement subjectElement,
                                  QName childAttribName, boolean isMandatoryAttr) {


        OMAttribute credentialAttr = subjectElement.getAttribute(
                new QName(childAttribName.getLocalPart()));
        SynapseXPath xpath = null;
        if (null == credentialAttr && isMandatoryAttr) {
            handleException(String.format("Attribute %s is mandatory as an input",
                                          childAttribName.getLocalPart()));
        }

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     */
    public String evaluate(MessageContext synCtx, String credentialElemName) {
        String sourceObject = null;
        // expression is required to perform the match
        if (credentialTokensMap.containsKey(credentialElemName)) {
            SynapseXPath xpath = credentialTokensMap.get(credentialElemName);
            sourceObject = xpath.stringValueOf(synCtx);
            if (null == sourceObject) {
                log.debug(String.format("Source String : %s evaluates to null",
                                        xpath.toString()));
            }
        } else if (credentialTokenValueMap.containsKey(credentialElemName)) {
            sourceObject = credentialTokenValueMap.get(credentialElemName);
        }
        return sourceObject;

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    private SynapseXPath getXPath(OMElement requestCredentialElement,
                                  QName childElementName, boolean isMandatoryElement) {


        OMElement credentialElem = requestCredentialElement
                .getFirstChildWithName(childElementName);
        SynapseXPath xpath = null;
        if (null == credentialElem && isMandatoryElement) {
            handleException(String.format("Credential element %s is mandatory",
                                          childElementName.getLocalPart()));
        }
        if (null != credentialElem) {

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    private SynapseXPath getXPath(OMElement subjectElement,
                                  QName childAttribName, boolean isMandatoryAttr) {


        OMAttribute credentialAttr = subjectElement.getAttribute(
                new QName(childAttribName.getLocalPart()));
        SynapseXPath xpath = null;
        if (null == credentialAttr && isMandatoryAttr) {
            handleException(String.format("Attribute %s is mandatory as an input",
                                          childAttribName.getLocalPart()));
        }

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  private SynapseXPath getXPath(OMElement requestCredentialElement,
      QName childElementName, boolean isMandatoryElement) {


    OMElement credentialElem = requestCredentialElement
        .getFirstChildWithName(childElementName);
    SynapseXPath xpath = null;
    if (null == credentialElem && isMandatoryElement) {
      handleException(String.format("Credential element %s is mandatory",
          childElementName.getLocalPart()));
    }
    if (null != credentialElem) {

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    public static void validateInputProperties(Input input, Input testInput) {
        Assert.assertEquals(testInput.getName(), input.getName());
        Assert.assertEquals(testInput.isRequired(), input.isRequired());
        if (testInput.getSourceXPath() != null && input.getSourceXPath() != null) {
            SynapseXPath inputXpath = input.getSourceXPath();
            SynapseXPath testXpath = testInput.getSourceXPath();
            validateXpathExpressions(inputXpath, testXpath);
        } else {
            Assert.assertEquals(testInput.getSourceXPath(), input.getSourceXPath());
        }
        Assert.assertEquals(testInput.getSourceValue(), input.getSourceValue());

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