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ElementIterator (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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javax.swing.text
Class ElementIterator

java.lang.Object
  javax.swing.text.ElementIterator

All Implemented Interfaces:

Cloneable

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public class ElementIterator
extends Object
implements Cloneable

ElementIterator, as the name suggests, iteratates over the Element tree. The constructor can be invoked with either Document or an Element as an argument. If the constructor is invoked with a Document as an argument then the root of the iteration is the return value of document.getDefaultRootElement(). The iteration happens in a depth-first manner. In terms of how boundary conditions are handled: a) if next() is called before first() or current(), the root will be returned. b) next() returns null to indicate the end of the list. c) previous() returns null when the current element is the root or next() has returned null. The ElementIterator does no locking of the Element tree. This means that it does not track any changes. It is the responsibility of the user of this class, to ensure that no changes happen during element iteration. Simple usage example: public void iterate() { ElementIterator it = new ElementIterator(root); Element elem; while (true) { if ((elem = next()) != null) { // process element System.out.println("elem: " + elem.getName()); } else { break; } } }

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Constructor Summary
ElementIterator(Document document)           Creates a new ElementIterator.
ElementIterator(Element root)           Creates a new ElementIterator.

 

Method Summary
Object	clone()           Clones the ElementIterator.
Element	current()           Fetches the current Element.
int	depth()           Fetches the current depth of element tree.
Element	first()           Fetches the first element.
Element	next()           Fetches the next Element.
Element	previous()           Fetches the previous Element.

 

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

ElementIterator

public ElementIterator(Document document)

Creates a new ElementIterator. The root element is taken to get the default root element of the document.

Parameters:

document - a Document.

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ElementIterator

public ElementIterator(Element root)

Creates a new ElementIterator.

Parameters:

root - the root Element.

Method Detail

clone

public Object clone()

Clones the ElementIterator.

Overrides:

clone in class Object

Returns:

a cloned ElementIterator Object.

See Also:

Cloneable

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first

public Element first()

Fetches the first element.

Returns:

an Element.

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depth

public int depth()

Fetches the current depth of element tree.

Returns:

the depth.

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current

public Element current()

Fetches the current Element.

Returns:

element on top of the stack or null if the root element is null

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next

public Element next()

Fetches the next Element. The strategy used to locate the next element is a depth-first search.

Returns:

the next element or null at the end of the list.

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previous

public Element previous()

Fetches the previous Element. If howver the current element is the last element, or the current element is null, then null is returned.

Returns:

previous Element if available

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.