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  /*
   * Copyright (c) 2004 World Wide Web Consortium,
   *
   * (Massachusetts Institute of Technology, European Research Consortium for
   * Informatics and Mathematics, Keio University). All Rights Reserved. This
   * work is distributed under the W3C(r) Software License [1] in the hope that
   * it will be useful, but WITHOUT ANY WARRANTY; without even the implied
   * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   *
  * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
  */
 
 package org.w3c.dom.xpath;
 
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.

 
 public interface XPathResult {
     // XPathResultType
     
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.
 
     public static final short ANY_TYPE                  = 0;
    
The result is a number as defined by [XPath 1.0]. Document modification does not invalidate the number, but may mean that reevaluation would not yield the same number.
 
     public static final short NUMBER_TYPE               = 1;
    
The result is a string as defined by [XPath 1.0]. Document modification does not invalidate the string, but may mean that the string no longer corresponds to the current document.
 
     public static final short STRING_TYPE               = 2;
    
The result is a boolean as defined by [XPath 1.0]. Document modification does not invalidate the boolean, but may mean that reevaluation would not yield the same boolean.
 
     public static final short BOOLEAN_TYPE              = 3;
    
The result is a node set as defined by [XPath 1.0] 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.
 
     public static final short UNORDERED_NODE_ITERATOR_TYPE = 4;
    
The result is a node set as defined by [XPath 1.0] that will be accessed iteratively, which will produce document-ordered nodes. Document modification invalidates the iteration.
 
     public static final short ORDERED_NODE_ITERATOR_TYPE = 5;
    
The result is a node set as defined by [XPath 1.0] 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.
 
     public static final short UNORDERED_NODE_SNAPSHOT_TYPE = 6;
    
The result is a node set as defined by [XPath 1.0] 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.
 
     public static final short ORDERED_NODE_SNAPSHOT_TYPE = 7;
    
The result is a node set as defined by [XPath 1.0] 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 resulting set has been found.
If there is more than one node in the actual result, the single node returned might not be the first in document order.
 
    public static final short ANY_UNORDERED_NODE_TYPE   = 8;
    
The result is a node set as defined by [XPath 1.0] 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.
    public static final short FIRST_ORDERED_NODE_TYPE   = 9;

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

    
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 to specify how the XPath number is converted to the native binding number.

Throws:
XPathException TYPE_ERR: raised if resultType is not NUMBER_TYPE.
    public double getNumberValue()
                             throws XPathException;

    
The value of this string result.

Throws:
XPathException TYPE_ERR: raised if resultType is not STRING_TYPE.
    public String getStringValue()
                             throws XPathException;

    
The value of this boolean result.

Throws:
XPathException TYPE_ERR: raised if resultType is not BOOLEAN_TYPE.
    public boolean getBooleanValue()
                             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.
    public Node getSingleNodeValue()
                             throws XPathException;

    
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.
    public boolean getInvalidIteratorState();

    
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.
    public int getSnapshotLength()
                             throws XPathException;

    
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.
org.w3c.dom.DOMException INVALID_STATE_ERR: The document has been mutated since the result was returned.
    public Node iterateNext()
                            throws XPathExceptionDOMException;

    
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.
    public Node snapshotItem(int index)
                             throws XPathException;
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