JavaTM 2 Platform
Std. Ed. v1.3

Class ElementIterator

All Implemented Interfaces:

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; } } }

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


public ElementIterator(Document document)
Creates a new ElementIterator. The root element is taken to get the default root element of the document.
a - Document.


public ElementIterator(Element root)
Creates a new ElementIterator.
the - root Element.
Method Detail


public Object clone()
Clones the ElementIterator.
clone in class Object
a cloned ElementIterator Object.


public Element first()
Fetches the first element.
an Element.


public int depth()
Fetches the current depth of element tree.
the depth.


public Element current()
Fetches the current Element.


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


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.

JavaTM 2 Platform
Std. Ed. v1.3

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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.

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