Example usage for org.apache.commons.jxpath ExpressionContext getJXPathContext

List of usage examples for org.apache.commons.jxpath ExpressionContext getJXPathContext

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Introduction

In this page you can find the example usage for org.apache.commons.jxpath ExpressionContext getJXPathContext.

Prototype

JXPathContext getJXPathContext();

Source Link

Document

Get the JXPathContext in which this function is being evaluated.

Usage

From source file:org.chiba.xml.xforms.xpath.ChibaExtensionFunctions.java

/**
 * Returns the calculation result of an external calculator.
 *
 * @param expressionContext the expression context.
 * @param uri the calculator uri.// w  w w  . j  a v  a  2s .co m
 * @return the calculation result of an external calculator.
 * @throws XFormsException if any error occurred during the calculation.
 * @deprecated use custom extension functions instead
 */
public static String calculate(ExpressionContext expressionContext, String uri) throws XFormsException {
    JXPathContext context = expressionContext.getJXPathContext();

    while (context != null) {
        Object contextBean = context.getContextBean();

        if (contextBean instanceof XFormsElement) {
            // get hook from jxpath to chiba
            XFormsElement xFormsElement = (XFormsElement) contextBean;
            Container container = xFormsElement.getModel().getContainer();
            Element contextElement = xFormsElement.getElement();
            Node instanceNode = (Node) expressionContext.getContextNodePointer().getNode();

            ModelItemCalculator calculator = container.getConnectorFactory().createModelItemCalculator(uri,
                    contextElement);
            return calculator.calculate(instanceNode);
        }

        context = context.getParentContext();
    }

    throw new XFormsException("invalid expression context when evaluating calculate('" + uri + "')");
}

From source file:org.chiba.xml.xforms.xpath.ChibaExtensionFunctions.java

/**
 * Returns the validation result of an external validator.
 *
 * @param expressionContext the expression context.
 * @param uri the calculator uri./*from   www. ja va  2s.c  o m*/
 * @return the validation result of an external validator.
 * @throws XFormsException if any error occurred during the validation.
 * @deprecated use custom extension functions instead
 */
public static boolean validate(ExpressionContext expressionContext, String uri) throws XFormsException {
    JXPathContext context = expressionContext.getJXPathContext();

    while (context != null) {
        Object contextBean = context.getContextBean();

        if (contextBean instanceof XFormsElement) {
            // get hook from jxpath to chiba
            XFormsElement xFormsElement = (XFormsElement) contextBean;
            Container container = xFormsElement.getModel().getContainer();
            Element contextElement = xFormsElement.getElement();
            Node instanceNode = (Node) expressionContext.getContextNodePointer().getNode();

            ModelItemValidator validator = container.getConnectorFactory().createModelItemValidator(uri,
                    contextElement);
            return validator.validate(instanceNode);
        }

        context = context.getParentContext();
    }

    throw new XFormsException("invalid expression context when evaluating validate('" + uri + "')");
}

From source file:org.chiba.xml.xforms.xpath.ChibaExtensionFunctions.java

/**
 * custom extension function to get the size of a local file.
 *
 * @param expressionContext//from www.j a va2  s .c  o m
 * @param nodeset nodeset must contain a single node that has a filename or
 * path as value. The value will be resolved against the baseURI of the
 * processor to find the file.
 * @return the size of the file as String
 *         <p/>
 *         todo: revisit code structure - fileSize and fileDate functions
 *         only differ in one line of code
 */
public static String fileSize(ExpressionContext expressionContext, List nodeset) {
    if ((nodeset == null) || (nodeset.size() == 0)) {
        return "Error: Nodeset does not exist";
    }
    JXPathContext rootContext = expressionContext.getJXPathContext();

    while (rootContext != null) {
        Object rootNode = rootContext.getContextBean();

        if (rootNode instanceof Instance) {
            //get the Context
            Instance instance = (Instance) rootNode;
            String baseUri = instance.getModel().getContainer().getProcessor().getBaseURI();
            String path;
            try {
                //                    uri = new URI(baseUri).getPath();
                path = new URI(baseUri).getPath().substring(1);
            } catch (URISyntaxException e) {
                return "Error: base URI not valid: " + baseUri;
            }

            File file = new File(path, (String) nodeset.get(0));
            if (!file.exists() || file.isDirectory()) {
                LOGGER.info("File " + file.toString() + " does not exist or is directory");
                return "";
            }

            return "" + file.length();
        }
        rootContext = rootContext.getParentContext();
    }
    return "";
}

From source file:org.chiba.xml.xforms.xpath.ChibaExtensionFunctions.java

/**
 * custom extension function to get the lastModified Date of a local file.
 *
 * @param expressionContext//from ww w.j  a  va  2  s  . c o m
 * @param nodeset must contain a single node that has a filename or path as
 * value. The value will be resolved against the baseURI of the processor to
 * find the file.
 * @param format a format pattern conformant with to
 * java.text.SimpleDateFormat. If an empty string is passed the format
 * defaults to "dd.MM.yyyy H:m:s".
 * @return the formatted lastModified Date of the file
 * @see java.text.SimpleDateFormat
 */
public static String fileDate(ExpressionContext expressionContext, List nodeset, String format) {
    if ((nodeset == null) || (nodeset.size() == 0)) {
        return "Error: Nodeset does not exist";
    }
    JXPathContext rootContext = expressionContext.getJXPathContext();

    while (rootContext != null) {
        Object rootNode = rootContext.getContextBean();

        if (rootNode instanceof Instance) {
            //                //get the Context
            //                Instance instance = (Instance) rootNode;
            //                String baseUri = instance.getModel().getContainer().getProcessor().getBaseURI();
            //
            //                File file = new File(baseUri,(String) nodeset.get(0));
            //                if(!file.exists()){
            //                    LOGGER.info("File " + file.toString() + " does not exist");
            //                    return "";
            //                }
            //get the Context
            Instance instance = (Instance) rootNode;
            String baseUri = instance.getModel().getContainer().getProcessor().getBaseURI();
            String path;
            try {
                //                    uri = new URI(baseUri).getPath();
                path = new URI(baseUri).getPath().substring(1);
            } catch (URISyntaxException e) {
                return "Error: base URI not valid: " + baseUri;
            }

            File file = new File(path, (String) nodeset.get(0));
            if (!file.exists() || file.isDirectory()) {
                LOGGER.info("File " + file.toString() + " does not exist or is directory");
                return "";
            }

            return formatDateString(file, format);
        }
        rootContext = rootContext.getParentContext();
    }
    return "Error: Calculation failed";
}

From source file:org.chiba.xml.xforms.xpath.CoreExtensionFunctions.java

/**
 * Declares the specified variable an returns its value.
 *
 * @param expressionContext the expression context.
 * @param name the name of the variable.
 * @param value the value of the variable.
 * @return the value of the variable.//from w w w.  j  a  v  a2  s  . co  m
 */
public static Object declare(ExpressionContext expressionContext, String name, Object value) {
    Object variable;
    if (value instanceof List) {
        // hell, jxpath passes nodesets as list here
        List list = (List) value;
        variable = list.size() > 0 ? list.get(0) : null;
    } else {
        variable = value;
    }

    Variables variables = expressionContext.getJXPathContext().getVariables();
    variables.declareVariable(name, variable);

    return value;
}

From source file:org.chiba.xml.xforms.xpath.CoreExtensionFunctions.java

/**
 * Undeclares the specified variable an returns its value.
 *
 * @param expressionContext the expression context.
 * @param name the name of the variable.
 * @return the value of the variable./*from  w  w  w . j  a v a2  s . c  o m*/
 */
public static Object undeclare(ExpressionContext expressionContext, String name) {
    Variables variables = expressionContext.getJXPathContext().getVariables();
    Object value = variables.getVariable(name);
    variables.undeclareVariable(name);

    return value;
}

From source file:org.chiba.xml.xforms.xpath.ExtensionFunctionsHelper.java

/**
 * Extracts the Chiba container from an JXPath expression context.
 *
 * @param expressionContext the JXPath expression context.
 * @return the Chiba container./*from w w w . j av  a2 s . c  o m*/
 */
public static Container getChibaContainer(ExpressionContext expressionContext) {
    if (expressionContext == null) {
        return null;
    }

    Object rootNode;
    JXPathContext rootContext = expressionContext.getJXPathContext();

    while (rootContext != null) {
        rootNode = rootContext.getContextBean();
        if (rootNode instanceof XFormsElement) {
            return ((XFormsElement) rootNode).getModel().getContainer();
        }

        rootContext = rootContext.getParentContext();
    }

    return null;
}

From source file:org.chiba.xml.xforms.xpath.XFormsExtensionFunctions.java

/**
 * The avg() Function [7.7.1].//from ww  w.  j a va 2  s .com
 * <p/>
 * Function avg returns the arithmetic average of the result of
 * converting the string-values of each node in the argument node-set
 * to a number. The sum is computed with sum(), and divided with div
 * by the value computed with count().
 *
 * @param context the expression context.
 * @param nodeset the node-set.
 * @return the computed node-set average.
 */
public static double avg(ExpressionContext context, List nodeset) {
    if ((nodeset == null) || (nodeset.size() == 0)) {
        return Double.NaN;
    }

    JXPathContext rootContext = context.getJXPathContext();
    rootContext.getVariables().declareVariable("nodeset", nodeset);

    Double value = (Double) rootContext.getValue("sum($nodeset) div count($nodeset)", Double.class);

    return value.doubleValue();
}

From source file:org.chiba.xml.xforms.xpath.XFormsExtensionFunctions.java

/**
 * The index() Function [7.7.5].//w w w .j  a  va2s  . c o  m
 * <p/>
 * Function index takes a string argument that is the idref of a repeat
 * and returns the current 1-based position of the repeat index for the
 * identified repeat see 9.3.1 The repeat Element for details on repeat
 * and its associated repeat index. If the specified argument does not
 * identify a repeat, processing stops with an exception.
 *
 * @param context the expression context.
 * @param idref   the repeat id.
 * @return the specified repeat index.
 * @throws XFormsException if any error occurred during repeat index lookup.
 */
public static int index(ExpressionContext context, String idref) throws XFormsException {
    JXPathContext rootContext = context.getJXPathContext();

    while (rootContext != null) {
        Object rootNode = rootContext.getContextBean();

        if (rootNode instanceof XFormsElement) {
            XFormsElement element = (XFormsElement) rootNode;
            Repeat repeat = (Repeat) element.getModel().getContainer().lookup(idref);

            if (LOGGER.isDebugEnabled()) {
                LOGGER.debug("index for Element: " + element.getId() + " evaluated to " + repeat.getIndex());
            }
            return repeat.getIndex();
        }

        rootContext = rootContext.getParentContext();
    }

    throw new XFormsException("invalid expression context when evaluating index('" + idref + "')");
}

From source file:org.chiba.xml.xforms.xpath.XFormsExtensionFunctions.java

/**
 * The instance() Function [7.10.1].// ww  w  .  j  a  va2  s .  c  o  m
 * <p/>
 * An XForms Model can contain more that one instance. This function allows
 * access to instance data, within the same XForms Model, but outside the
 * instance data containing the context node.
 * <p/>
 * The argument is converted to a string as if by a call to the string function.
 * This string is treated as an IDREF, which is matched against instance elements
 * in the containing document. If a match is located, and the matching instance
 * data is associated with the same XForms Model as the current context node,
 * this function returns a node-set containing just the root element node (also
 * called the document element node) of the referenced instance data. In all
 * other cases, an empty node-set is returned.
 *
 * @param context the expression context.
 * @param idref   the instance id.
 * @return the specified instance.
 * @throws XFormsException if any error occurred during instance lookup.
 */
public static Object instance(ExpressionContext context, String idref) throws XFormsException {
    JXPathContext rootContext = context.getJXPathContext();

    while (rootContext != null) {
        Object rootNode = rootContext.getContextBean();

        //does not work cause rootnode is no XFormsElement
        if (rootNode instanceof XFormsElement) {
            Object instance = ((XFormsElement) rootNode).getModel().getContainer().lookup(idref);

            if (instance != null && instance instanceof Instance) {
                Pointer pointer = ((Instance) instance).getPointer(BindingResolver.OUTERMOST_CONTEXT);
                return pointer;
            }
        }

        rootContext = rootContext.getParentContext();
    }

    throw new XFormsException("invalid expression context when evaluating instance('" + idref + "')");
}