sk.uniba.euromath.tools.xml
Class ElementStack

java.lang.Object
  sk.uniba.euromath.tools.xml.ElementStack

All Implemented Interfaces:

Iterable<QName>

public final class ElementStack
extends Object
implements Iterable<QName>

A stack of element names. Any element name may be added on top of the stack, however only element with correct qname as the supplied one can be popped. This functionality is intended to catch mismatched element qnames when operating with SAX handlers.

Author:

Martin Vysny

Constructor Summary

ElementStack()
Constructs an empty stack.

ElementStack(ElementStack other)
Copy-constructor.

Method Summary

void	assertEmpty() Ensures that the stack is empty.
void	clear() Removes all elements from the stack.
boolean	equals(Object obj)
QName	getRoot() Returns the root element's qname.
int	hashCode()
boolean	isEmpty() Tests if this stack is empty.
Iterator<QName>	iterator()
void	pop(QName qname) Removes the topmost qname from the stack.
void	push(QName qname) Pushes a qname onto the top of this stack.
int	size() Returns the length of the stack.
QName	topmost() Looks at the topmost qname without removing it from the stack.
QName	topmost(int i) Looks at the i-th topmost qname without removing it from the stack.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ElementStack

public ElementStack()

Constructs an empty stack.

ElementStack

public ElementStack(ElementStack other)

Copy-constructor.

Parameters:

other - clone given stack.

Method Detail

isEmpty

public boolean isEmpty()

Tests if this stack is empty.

Returns:

true if the stack is empty.

assertEmpty

public void assertEmpty()
                 throws SAXException

Ensures that the stack is empty.

Throws:

SAXException - if the stack is not empty.

topmost

public QName topmost()

Looks at the topmost qname without removing it from the stack.

Returns:

topmost qname.

Throws:

NoSuchElementException - if stack is empty.

topmost

public QName topmost(int i)

Looks at the i-th topmost qname without removing it from the stack.

Parameters:

i - index into the namespace path, 1 is the topmost, 2 is the second topmost etc.

Returns:

topmost qname.

Throws:

NoSuchElementException - if i points beyond root element.

pop

public void pop(QName qname)
         throws SAXException

Removes the topmost qname from the stack.

Parameters:

qname - expected qname of topmost element. You may use DomTools.getQName(String, String, String) to convert from the SAX-style qname.

Throws:

SAXException - if path is empty or topmost element's qname does not match.

push

public void push(QName qname)

Pushes a qname onto the top of this stack.

Parameters:

qname - new topmost qname. You may use DomTools.getQName(String, String, String) to convert from the SAX-style qname.

size

public int size()

Returns the length of the stack.

Returns:

the element number.

getRoot

public QName getRoot()

Returns the root element's qname.

Returns:

the bottom of the stack.

Throws:

NoSuchElementException - if stack is empty.

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

iterator

public Iterator<QName> iterator()

Specified by:

iterator in interface Iterable<QName>

clear

public void clear()

Removes all elements from the stack.