org.basex.query.up.primitives

Class StructuralUpdate

java.lang.Object

org.basex.query.up.primitives.UpdatePrimitive

org.basex.query.up.primitives.StructuralUpdate

All Implemented Interfaces:

java.lang.Comparable<UpdatePrimitive>

Direct Known Subclasses:

DeleteNode, NodeCopy, ReplaceElementContent

public abstract class StructuralUpdate
extends UpdatePrimitive

Base class for all update primitives that lead to structural changes / pre value shifts on the database table.

Author:

BaseX Team 2005-12, BSD License, Lukas Kircher

Field Summary

Fields inherited from class org.basex.query.up.primitives.UpdatePrimitive

data, input, pre, type

Method Summary

Methods

Modifier and Type	Method and Description
abstract boolean	adjacentTexts(int c) Checks whether adjacent text nodes have been introduced as a result of this update primitive.
int	preShifts() Returns the number of pre value shifts that are introduced by this primitive, if applied.

Methods inherited from class org.basex.query.up.primitives.UpdatePrimitive

apply, compareTo, merge, size, targetNode, update

Methods inherited from class java.lang.Object

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

Method Detail

preShifts

public final int preShifts()

Returns the number of pre value shifts that are introduced by this primitive, if applied. I.e. for an insert primitive, the value is equal to the number of inserted nodes by this primitive.

Returns:

number of pre value shifts

adjacentTexts

public abstract boolean adjacentTexts(int c)

Checks whether adjacent text nodes have been introduced as a result of this update primitive. Text node adjacency can only be taken care of if no more updates are to be expected for the left sibling of this target node. The total number of deleted/inserted nodes on the preceding axis of this target node is given recalculate the actual pre value of this target.

Parameters:

c - pre value shifts introduced by updates on the preceding sibling axis of this target node

Returns:

adjacent text nodes have been found and merged