lux.index

Class XPathValueMapper

java.lang.Object

lux.index.XmlPathMapper

lux.index.XPathValueMapper

All Implemented Interfaces:

StAXHandler

public class XPathValueMapper
extends XmlPathMapper

Each path-value is a string of path components, as defined in XmlPathMapper, followed by a value token. Element and attribute string values are represented by 8-character hashes of their first N characters. If the value fits in 8 characters, it is padded with nulls (unicode 0). The hash algorithm is analogous to that used by java.lang.String, but arithmetic is done with shorts rather than ints, and we keep more of them so that the likelihood of collisions is very small.

Field Summary

Fields

Modifier and Type	Field and Description
static int	HASH_SIZE

Fields inherited from class lux.index.XmlPathMapper

currentPath, currentQName

Constructor Summary

Constructors

Constructor and Description
XPathValueMapper()

Method Summary

Methods

Modifier and Type	Method and Description
ArrayList<char[]>	getPathValues()
void	handleEvent(XMLStreamReader reader, int eventType) This method receives StAX events.
static char[]	hashString(char[] value, char[] buf)
void	reset() reinitialize any internal state and prepare the handler for re-use

Methods inherited from class lux.index.XmlPathMapper

encodeQName, getAttQNameCounts, getEltQNameCounts, getEventAttQName, getPathCounts, isNamespaceAware, setNamespaceAware

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

HASH_SIZE

public static final int HASH_SIZE

See Also:

Constant Field Values

Constructor Detail

XPathValueMapper

public XPathValueMapper()

Method Detail

getPathValues

public ArrayList<char[]> getPathValues()

reset

public void reset()

Description copied from interface: StAXHandler

reinitialize any internal state and prepare the handler for re-use

Specified by:

reset in interface StAXHandler

Overrides:

reset in class XmlPathMapper

handleEvent

public void handleEvent(XMLStreamReader reader,
               int eventType)

Description copied from interface: StAXHandler

This method receives StAX events. It should never call XMLStreamReader.next() since if it does, its caller will miss the event.

Specified by:

handleEvent in interface StAXHandler

Overrides:

handleEvent in class XmlPathMapper

Parameters:

reader - the reader from which events are being read

eventType - the XML stream event type

hashString

public static char[] hashString(char[] value,
                char[] buf)