com.caucho.xpath.pattern
Class FromPrevious

java.lang.Object
  com.caucho.xpath.pattern.AbstractPattern
      com.caucho.xpath.pattern.FromPrevious

public class FromPrevious
extends AbstractPattern

Matches nodes preceding the current node, not counting descendants.

Field Summary

Fields inherited from class com.caucho.xpath.pattern.AbstractPattern

_child, _parent, log, XMLNS

Constructor Summary

FromPrevious(AbstractPattern parent)

Method Summary

AbstractPattern	copyAxis() Returns the node itself for the axis.
AbstractPattern	copyPosition() Returns null since the axis isn't part of the position pattern.
int	count(org.w3c.dom.Node node, Env env, AbstractPattern pattern) counts matching nodes preceding the axis context.
NodeIterator	createNodeIterator(org.w3c.dom.Node node, ExprEnvironment env, AbstractPattern match) Creates a new node iterator.
org.w3c.dom.Node	firstNode(org.w3c.dom.Node node, ExprEnvironment env) Returns the first node in the selection order.
boolean	isAscending() The iterator is in reverse document order.
boolean	isStrictlyAscending() Returns true if the pattern is strictly ascending.
boolean	isUnique() Returns true if the pattern is strictly ascending.
org.w3c.dom.Node	lastNode(org.w3c.dom.Node node) Returns the last node in the selection order.
boolean	match(org.w3c.dom.Node node, ExprEnvironment env) matches if we can find a following node matching the parent pattern.
org.w3c.dom.Node	nextNode(org.w3c.dom.Node node, org.w3c.dom.Node lastNode) Returns the next node in the selection order.
int	position(org.w3c.dom.Node node, Env env, AbstractPattern pattern) Calculates position by counting next nodes matching the pattern.
java.lang.String	toString()

Methods inherited from class com.caucho.xpath.pattern.AbstractPattern

findAny, getNodeName, getParent, getPrefix, getPriority, select, selectUnique, toPatternString

Methods inherited from class java.lang.Object

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

Constructor Detail

FromPrevious

public FromPrevious(AbstractPattern parent)

Method Detail

match

public boolean match(org.w3c.dom.Node node,
                     ExprEnvironment env)
              throws XPathException

matches if we can find a following node matching the parent pattern.

Specified by:

match in class AbstractPattern

Parameters:

node - the node to test

env - the variable environment.

Returns:

true if the node matches the pattern.

Throws:

XPathException

isAscending

public boolean isAscending()

The iterator is in reverse document order.

Overrides:

isAscending in class AbstractPattern

position

public int position(org.w3c.dom.Node node,
                    Env env,
                    AbstractPattern pattern)
             throws XPathException

Calculates position by counting next nodes matching the pattern. The axis is a previous node matching the parent pattern.

Parameters:

node - the current node

env - the variable environment

pattern - the position pattern

Returns:

the node's position.

Throws:

XPathException

count

public int count(org.w3c.dom.Node node,
                 Env env,
                 AbstractPattern pattern)
          throws XPathException

counts matching nodes preceding the axis context. count() walks backwards from the axis context.

Parameters:

node - the current node

env - the variable environment

pattern - the position pattern

Returns:

the count of the node list.

Throws:

XPathException

isUnique

public boolean isUnique()

Returns true if the pattern is strictly ascending.

firstNode

public org.w3c.dom.Node firstNode(org.w3c.dom.Node node,
                                  ExprEnvironment env)

Returns the first node in the selection order.

Overrides:

firstNode in class AbstractPattern

Parameters:

node - the current node

Returns:

the first node

nextNode

public org.w3c.dom.Node nextNode(org.w3c.dom.Node node,
                                 org.w3c.dom.Node lastNode)

Returns the next node in the selection order.

Overrides:

nextNode in class AbstractPattern

Parameters:

node - the current node

lastNode - the original node (for checking ancestors)

Returns:

the next node

lastNode

public org.w3c.dom.Node lastNode(org.w3c.dom.Node node)

Returns the last node in the selection order.

Overrides:

lastNode in class AbstractPattern

Parameters:

node - the current node

Returns:

the last node

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

createNodeIterator

public NodeIterator createNodeIterator(org.w3c.dom.Node node,
                                       ExprEnvironment env,
                                       AbstractPattern match)
                                throws XPathException

Creates a new node iterator.

Overrides:

createNodeIterator in class AbstractPattern

Parameters:

node - the starting node

env - the variable environment

match - the axis match pattern

Returns:

the node iterator

Throws:

XPathException

copyAxis

public AbstractPattern copyAxis()

Returns the node itself for the axis.

Overrides:

copyAxis in class AbstractPattern

copyPosition

public AbstractPattern copyPosition()

Returns null since the axis isn't part of the position pattern.

Overrides:

copyPosition in class AbstractPattern

isStrictlyAscending

public boolean isStrictlyAscending()

Returns true if the pattern is strictly ascending.

Overrides:

isStrictlyAscending in class AbstractPattern