Class ElementIterator
- java.lang.Object
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- javax.swing.text.ElementIterator
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- All Implemented Interfaces:
- Cloneable
public class ElementIterator extends Object implements Cloneable
ElementIterator, as the name suggests, iterates 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
Constructors Constructor and Description ElementIterator(Document document)Creates a new ElementIterator.ElementIterator(Element root)Creates a new ElementIterator.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method and Description Objectclone()Clones the ElementIterator.Elementcurrent()Fetches the current Element.intdepth()Fetches the current depth of element tree.Elementfirst()Fetches the first element.Elementnext()Fetches the next Element.Elementprevious()Fetches the previous Element.
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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:
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document- a Document.
ElementIterator
public ElementIterator(Element root)
Creates a new ElementIterator.- Parameters:
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root- the root Element.
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Method Detail
clone
public Object clone()
Clones the ElementIterator.
first
public Element first()
Fetches the first element.- Returns:
- an Element.
depth
public int depth()
Fetches the current depth of element tree.- Returns:
- the depth.
current
public Element current()
Fetches the current Element.- Returns:
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element on top of the stack or
nullif the root element isnull
next
public Element next()
Fetches the next Element. The strategy used to locate the next element is a depth-first search.- Returns:
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the next element or
nullat the end of the list.
previous
public Element previous()
Fetches the previous Element. If however the current element is the last element, or the current element is null, then null is returned.- Returns:
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previous
Elementif available
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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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