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XPathExpression


javax.xml.xpath

Interface XPathExpression



  • public interface XPathExpression

    XPathExpression provides access to compiled XPath expressions.

    Evaluation of XPath Expressions.
    context If a request is made to evaluate the expression in the absence of a context item, an empty document node will be used for the context. For the purposes of evaluating XPath expressions, a DocumentFragment is treated like a Document node.
    variables If the expression contains a variable reference, its value will be found through the XPathVariableResolver. An XPathExpressionException is raised if the variable resolver is undefined or the resolver returns null for the variable. The value of a variable must be immutable through the course of any single evaluation.

    functions If the expression contains a function reference, the function will be found through the XPathFunctionResolver. An XPathExpressionException is raised if the function resolver is undefined or the function resolver returns null for the function.

    QNames QNames in the expression are resolved against the XPath namespace context.
    result This result of evaluating an expression is converted to an instance of the desired return type. Valid return types are defined in XPathConstants. Conversion to the return type follows XPath conversion rules.

    Since:
    1.5
    See Also:
    XML Path Language (XPath) Version 1.0, Expressions
    • Method Summary

      Methods
      Modifier and Type Method and Description
      String evaluate(InputSource source)
      Evaluate the compiled XPath expression in the context of the specified InputSource and return the result as a String.
      Object evaluate(InputSource source, QName returnType)
      Evaluate the compiled XPath expression in the context of the specified InputSource and return the result as the specified type.
      String evaluate(Object item)
      Evaluate the compiled XPath expression in the specified context and return the result as a String.
      Object evaluate(Object item, QName returnType)
      Evaluate the compiled XPath expression in the specified context and return the result as the specified type.
    • Method Detail

      • evaluate

        Object evaluate(Object item,
                      QName returnType)
                        throws XPathExpressionException

        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 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.

        Parameters:
        item - The starting context (node or node list, for example).
        returnType - The desired return type.
        Returns:
        The Object that is the result of evaluating the expression and converting the result to returnType.
        Throws:
        XPathExpressionException - If the expression cannot be evaluated.
        IllegalArgumentException - If returnType is not one of the types defined in XPathConstants.
        NullPointerException - If returnType is null.


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