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Java Standard Edition (SE)

XPathExpression


compact2, compact3
javax.xml.xpath

Interface XPathExpression

    • Method Summary

      All Methods Instance Methods Abstract 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 (a node, 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.
      • evaluate

        Object evaluate(InputSource source,
                        QName returnType)
                 throws XPathExpressionException

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

        This method builds a data model for the InputSource and calls evaluate(Object item, QName returnType) on the resulting document object.

        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 source or returnType is null, then a NullPointerException is thrown.

        Parameters:
        source - The InputSource of the document to evaluate over.
        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 source or returnType is null.


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