org.apache.xpath.domapi

Class XPathResultImpl

java.lang.Object

org.apache.xpath.domapi.XPathResultImpl

Implemented Interfaces:: EventListener, XPathResult

public class XPathResultImpl

extends java.lang.Object

implements XPathResult, EventListener

The class provides an implementation XPathResult according to the DOM L3 XPath Specification, Working Draft 28, March 2002.

The XPathResult interface represents the result of the evaluation of an XPath 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.

This implementation wraps an XObject.

See Also:: XObject, XPathResult

Fields inherited from interface org.w3c.dom.xpath.XPathResult
`ANY_TYPE`, `ANY_UNORDERED_NODE_TYPE`, `BOOLEAN_TYPE`, `FIRST_ORDERED_NODE_TYPE`, `NUMBER_TYPE`, `ORDERED_NODE_ITERATOR_TYPE`, `ORDERED_NODE_SNAPSHOT_TYPE`, `STRING_TYPE`, `UNORDERED_NODE_ITERATOR_TYPE`, `UNORDERED_NODE_SNAPSHOT_TYPE`

Method Summary
`boolean`	`getBooleanValue()`
`boolean`	`getInvalidIteratorState()`
`double`	`getNumberValue()` The value of this number result.
`short`	`getResultType()`
`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.
`String`	`getTypeString(int type)` Given a request type, return the equivalent string.
`void`	`handleEvent(Event event)`
`static boolean`	`isValidType(short type)` Check if the specified type is one of the supported types.
`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.

getBooleanValue

public boolean getBooleanValue()
            throws XPathException

Specified by:
getBooleanValue in interface XPathResult
See Also:
XPathResult.getBooleanValue()

getInvalidIteratorState

public boolean getInvalidIteratorState()

Specified by:
getInvalidIteratorState in interface XPathResult
See Also:
XPathResult.getInvalidIteratorState()

getNumberValue

public double getNumberValue()
            throws XPathException

The value of this number result.
Specified by:
getNumberValue in interface XPathResult
Throws:
XPathException - TYPE_ERR: raised if resultType is not NUMBER_TYPE.
See Also:
XPathResult.getNumberValue()

getResultType

public short getResultType()

Specified by:
getResultType in interface XPathResult
See Also:
XPathResult.getResultType()

getSingleNodeValue

public Node getSingleNodeValue()
            throws XPathException

The value of this single node result, which may be null.
Specified by:
getSingleNodeValue in interface XPathResult
Throws:
XPathException - TYPE_ERR: raised if resultType is not ANY_UNORDERED_NODE_TYPE or FIRST_ORDERED_NODE_TYPE.
See Also:
XPathResult.getSingleNodeValue()

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.
Specified by:
getSnapshotLength in interface XPathResult
Throws:
XPathException - TYPE_ERR: raised if resultType is not UNORDERED_NODE_SNAPSHOT_TYPE or ORDERED_NODE_SNAPSHOT_TYPE.
See Also:
XPathResult.getSnapshotLength()

getStringValue

public String getStringValue()
            throws XPathException

The value of this string result.
Specified by:
getStringValue in interface XPathResult
Throws:
XPathException - TYPE_ERR: raised if resultType is not STRING_TYPE.
See Also:
XPathResult.getStringValue()

getTypeString

public String getTypeString(int type)

Given a request type, return the equivalent string. For diagnostic purposes.
Returns:
type string

handleEvent

public void handleEvent(Event event)

Specified by:
handleEvent in interface EventListener
See Also:
EventListener.handleEvent(Event)

isValidType

public static boolean isValidType(short type)

Check if the specified type is one of the supported types.
Parameters:
type - The specified type
Returns:
true If the specified type is supported; otherwise, returns false.

iterateNext

public Node iterateNext()
            throws XPathException,
                   DOMException

Iterates and returns the next node from the node set or nullif there are no more nodes.
Specified by:
iterateNext in interface XPathResult
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.
See Also:
XPathResult.iterateNext()

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.
Specified by:
snapshotItem in interface XPathResult
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.
See Also:
XPathResult.snapshotItem(int)

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