Module jdk.xml.dom
Package org.w3c.dom.xpath

Interface XPathResult


  • public interface XPathResult
    The XPathResult interface represents the result of the evaluation of an XPath 1.0 expression within the context of a particular node. Since evaluation of an XPath expression can result in various result types, this object makes it possible to discover and manipulate the type and value of the result.

    See also the Document Object Model (DOM) Level 3 XPath Specification.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static short ANY_TYPE
      This code does not represent a specific type.
      static short ANY_UNORDERED_NODE_TYPE
      The result is a node set as defined by and will be accessed as a single node, which may be nullif the node set is empty.
      static short BOOLEAN_TYPE
      The result is a boolean as defined by .
      static short FIRST_ORDERED_NODE_TYPE
      The result is a node set as defined by and will be accessed as a single node, which may be null if the node set is empty.
      static short NUMBER_TYPE
      The result is a number as defined by .
      static short ORDERED_NODE_ITERATOR_TYPE
      The result is a node set as defined by that will be accessed iteratively, which will produce document-ordered nodes.
      static short ORDERED_NODE_SNAPSHOT_TYPE
      The result is a node set as defined by that will be accessed as a snapshot list of nodes that will be in original document order.
      static short STRING_TYPE
      The result is a string as defined by .
      static short UNORDERED_NODE_ITERATOR_TYPE
      The result is a node set as defined by that will be accessed iteratively, which may not produce nodes in a particular order.
      static short UNORDERED_NODE_SNAPSHOT_TYPE
      The result is a node set as defined by that will be accessed as a snapshot list of nodes that may not be in a particular order.

    • Field Detail

      • ANY_TYPE

        static final short ANY_TYPE
        This code does not represent a specific type. An evaluation of an XPath expression will never produce this type. If this type is requested, then the evaluation returns whatever type naturally results from evaluation of the expression.
        If the natural result is a node set when ANY_TYPE was requested, then UNORDERED_NODE_ITERATOR_TYPE is always the resulting type. Any other representation of a node set must be explicitly requested.
        See Also:
        Constant Field Values

      • NUMBER_TYPE

        static final short NUMBER_TYPE
        The result is a number as defined by . Document modification does not invalidate the number, but may mean that reevaluation would not yield the same number.
        See Also:
        Constant Field Values

      • STRING_TYPE

        static final short STRING_TYPE
        The result is a string as defined by . Document modification does not invalidate the string, but may mean that the string no longer corresponds to the current document.
        See Also:
        Constant Field Values

      • BOOLEAN_TYPE

        static final short BOOLEAN_TYPE
        The result is a boolean as defined by . Document modification does not invalidate the boolean, but may mean that reevaluation would not yield the same boolean.
        See Also:
        Constant Field Values

      • UNORDERED_NODE_ITERATOR_TYPE

        static final short UNORDERED_NODE_ITERATOR_TYPE
        The result is a node set as defined by that will be accessed iteratively, which may not produce nodes in a particular order. Document modification invalidates the iteration.
        This is the default type returned if the result is a node set and ANY_TYPE is requested.
        See Also:
        Constant Field Values

      • ORDERED_NODE_ITERATOR_TYPE

        static final short ORDERED_NODE_ITERATOR_TYPE
        The result is a node set as defined by that will be accessed iteratively, which will produce document-ordered nodes. Document modification invalidates the iteration.
        See Also:
        Constant Field Values

      • UNORDERED_NODE_SNAPSHOT_TYPE

        static final short UNORDERED_NODE_SNAPSHOT_TYPE
        The result is a node set as defined by that will be accessed as a snapshot list of nodes that may not be in a particular order. Document modification does not invalidate the snapshot but may mean that reevaluation would not yield the same snapshot and nodes in the snapshot may have been altered, moved, or removed from the document.
        See Also:
        Constant Field Values

      • ORDERED_NODE_SNAPSHOT_TYPE

        static final short ORDERED_NODE_SNAPSHOT_TYPE
        The result is a node set as defined by that will be accessed as a snapshot list of nodes that will be in original document order. Document modification does not invalidate the snapshot but may mean that reevaluation would not yield the same snapshot and nodes in the snapshot may have been altered, moved, or removed from the document.
        See Also:
        Constant Field Values

      • ANY_UNORDERED_NODE_TYPE

        static final short ANY_UNORDERED_NODE_TYPE
        The result is a node set as defined by and will be accessed as a single node, which may be nullif the node set is empty. Document modification does not invalidate the node, but may mean that the result node no longer corresponds to the current document. This is a convenience that permits optimization since the implementation can stop once any node in the in the resulting set has been found.
        If there are more than one node in the actual result, the single node returned might not be the first in document order.
        See Also:
        Constant Field Values

      • FIRST_ORDERED_NODE_TYPE

        static final short FIRST_ORDERED_NODE_TYPE
        The result is a node set as defined by and will be accessed as a single node, which may be null if the node set is empty. Document modification does not invalidate the node, but may mean that the result node no longer corresponds to the current document. This is a convenience that permits optimization since the implementation can stop once the first node in document order of the resulting set has been found.
        If there are more than one node in the actual result, the single node returned will be the first in document order.
        See Also:
        Constant Field Values

    • Method Detail

      • getResultType

        short getResultType​()
        A code representing the type of this result, as defined by the type constants.

      • getNumberValue

        double getNumberValue​()
               throws XPathException
        The value of this number result. If the native double type of the DOM binding does not directly support the exact IEEE 754 result of the XPath expression, then it is up to the definition of the binding binding to specify how the XPath number is converted to the native binding number.
        Throws:
        XPathException - TYPE_ERR: raised if resultType is not NUMBER_TYPE.

      • getStringValue

        String getStringValue​()
               throws XPathException
        The value of this string result.
        Throws:
        XPathException - TYPE_ERR: raised if resultType is not STRING_TYPE.

      • getBooleanValue

        boolean getBooleanValue​()
                 throws XPathException
        The value of this boolean result.
        Throws:
        XPathException - TYPE_ERR: raised if resultType is not BOOLEAN_TYPE.

      • getSingleNodeValue

        Node getSingleNodeValue​()
                 throws XPathException
        The value of this single node result, which may be null.
        Throws:
        XPathException - TYPE_ERR: raised if resultType is not ANY_UNORDERED_NODE_TYPE or FIRST_ORDERED_NODE_TYPE.

      • getInvalidIteratorState

        boolean getInvalidIteratorState​()
        Signifies that the iterator has become invalid. True if resultType is UNORDERED_NODE_ITERATOR_TYPE or ORDERED_NODE_ITERATOR_TYPE and the document has been modified since this result was returned.

      • getSnapshotLength

        int getSnapshotLength​()
               throws XPathException
        The number of nodes in the result snapshot. Valid values for snapshotItem indices are 0 to snapshotLength-1 inclusive.
        Throws:
        XPathException - TYPE_ERR: raised if resultType is not UNORDERED_NODE_SNAPSHOT_TYPE or ORDERED_NODE_SNAPSHOT_TYPE.

      • iterateNext

        Node iterateNext​()
          throws XPathException,
                 DOMException
        Iterates and returns the next node from the node set or nullif there are no more nodes.
        Returns:
        Returns the next node.
        Throws:
        XPathException - TYPE_ERR: raised if resultType is not UNORDERED_NODE_ITERATOR_TYPE or ORDERED_NODE_ITERATOR_TYPE.
        DOMException - INVALID_STATE_ERR: The document has been mutated since the result was returned.

      • snapshotItem

        Node snapshotItem​(int index)
           throws XPathException
        Returns the indexth item in the snapshot collection. If index is greater than or equal to the number of nodes in the list, this method returns null. Unlike the iterator result, the snapshot does not become invalid, but may not correspond to the current document if it is mutated.
        Parameters:
        index - Index into the snapshot collection.
        Returns:
        The node at the indexth position in the NodeList, or null if that is not a valid index.
        Throws:
        XPathException - TYPE_ERR: raised if resultType is not UNORDERED_NODE_SNAPSHOT_TYPE or ORDERED_NODE_SNAPSHOT_TYPE.