uk.ac.sheffield.jast.valid

Class EmptyContentRule

java.lang.Object

uk.ac.sheffield.jast.valid.GrammarRule

uk.ac.sheffield.jast.valid.SimpleRule

uk.ac.sheffield.jast.valid.EmptyContentRule

public class EmptyContentRule
extends SimpleRule

EmptyContentRule is a SimpleRule that accepts Elements with no contents. EmptyContentRule corresponds to the DTD category keyword EMPTY, or the XSD complex type which has only attributes. It will only succeed if the current Element node has no contents whatsoever, that is, it restricts valid Elements to those with no Text or Element children.

An EmptyContentRule is created for every DTD grammar rule production that specifies EMPTY content. An EmptyContentRule is created for any XSD complex type which has only Attributes and no Element children.

Version:

2.5

Author:

Anthony J H Simons

Field Summary

Fields inherited from class uk.ac.sheffield.jast.valid.GrammarRule

identifier, parent

Constructor Summary

Constructors

Constructor and Description
EmptyContentRule() Creates a EmptyContentRule.

Method Summary

Modifier and Type	Method and Description
boolean	accept(Element node) Reports whether this EmptyContentRule accepts an Element node.
java.lang.String	toString() Returns a pretty representation of this EmptyContentRule.

Methods inherited from class uk.ac.sheffield.jast.valid.SimpleRule

isNestingRule

Methods inherited from class uk.ac.sheffield.jast.valid.GrammarRule

addChildRule, clearError, getChildIndex, getIdentifier, getRuleChildren, isAttributeRule, isElementRule, restrict, setChildIndex, setError, setParent, validate

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyContentRule

public EmptyContentRule()

Creates a EmptyContentRule. The identifier of an EmptyContentRule is the symbol "EMPTY".

Method Detail

accept

public boolean accept(Element node)

Reports whether this EmptyContentRule accepts an Element node. Accepts the node, if it has no contents of any kind. Does not advance the matched index if it succeeds, since there are no children of the node to match.

Overrides:

accept in class GrammarRule

Parameters:

node - the XML Element node.

Returns:

true, if the node is empty.

toString

public java.lang.String toString()

Returns a pretty representation of this EmptyContentRule. Returns the distinguished symbol "$Empty".

Overrides:

toString in class java.lang.Object