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.

Field Summary
`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 [XPath 1.0] and will be accessed as a single node, which may be `null`if the node set is empty.
`static short`	`BOOLEAN_TYPE` The result is a boolean as defined by [XPath 1.0].
`static short`	`FIRST_ORDERED_NODE_TYPE` 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.
`static short`	`NUMBER_TYPE` The result is a number as defined by [XPath 1.0].
`static short`	`ORDERED_NODE_ITERATOR_TYPE` The result is a node set as defined by [XPath 1.0] 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 [XPath 1.0] 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 [XPath 1.0].
`static short`	`UNORDERED_NODE_ITERATOR_TYPE` 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.
`static short`	`UNORDERED_NODE_SNAPSHOT_TYPE` 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.

Method Summary
`boolean`	`getBooleanValue()` The value of this boolean result.
`boolean`	`getInvalidIteratorState()` Signifies that the iterator has become invalid.
`double`	`getNumberValue()` The value of this number result.
`short`	`getResultType()` A code representing the type of this result, as defined by the type constants.
`Node`	`getSingleNodeValue()` The value of this single node result, which may be `null`.
`int`	`getSnapshotLength()` The number of nodes in the result snapshot.
`String`	`getStringValue()` The value of this string result.
`Node`	`iterateNext()` Iterates and returns the next node from the node set or `null`if there are no more nodes.
`Node`	`snapshotItem(int index)` Returns the `index`th item in the snapshot collection.

ANY_TYPE

public 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.
Field Value:
0

ANY_UNORDERED_NODE_TYPE

public static final short ANY_UNORDERED_NODE_TYPE

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.
Field Value:
8

BOOLEAN_TYPE

public static final short BOOLEAN_TYPE

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.
Field Value:
3

FIRST_ORDERED_NODE_TYPE

public static final short FIRST_ORDERED_NODE_TYPE

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.
Field Value:
9

NUMBER_TYPE

public static final short NUMBER_TYPE

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.
Field Value:
1

ORDERED_NODE_ITERATOR_TYPE

public static final short ORDERED_NODE_ITERATOR_TYPE

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.
Field Value:
5

ORDERED_NODE_SNAPSHOT_TYPE

public static final short ORDERED_NODE_SNAPSHOT_TYPE

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.
Field Value:
7

STRING_TYPE

public static final short STRING_TYPE

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.
Field Value:
2

UNORDERED_NODE_ITERATOR_TYPE

public static final short UNORDERED_NODE_ITERATOR_TYPE

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.
Field Value:
4

UNORDERED_NODE_SNAPSHOT_TYPE

public static final short UNORDERED_NODE_SNAPSHOT_TYPE

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.
Field Value:
6

getBooleanValue

public boolean getBooleanValue()
            throws XPathException

The value of this boolean result.
Throws:
XPathException - TYPE_ERR: raised if resultType is not BOOLEAN_TYPE.

getInvalidIteratorState

public 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.

getNumberValue

public 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 to specify how the XPath number is converted to the native binding number.
Throws:
XPathException - TYPE_ERR: raised if resultType is not NUMBER_TYPE.

getResultType

public short getResultType()

A code representing the type of this result, as defined by the type constants.

getSingleNodeValue

public 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.

getSnapshotLength

public 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.

getStringValue

public String getStringValue()
            throws XPathException

The value of this string result.
Throws:
XPathException - TYPE_ERR: raised if resultType is not STRING_TYPE.

iterateNext

public 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

public 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.

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