freemarker.ext.beans
Class IteratorModel

java.lang.Object
  freemarker.ext.beans.BeanModel
      freemarker.ext.beans.IteratorModel

All Implemented Interfaces:

WrapperTemplateModel, AdapterTemplateModel, TemplateCollectionModel, TemplateHashModel, TemplateHashModelEx, TemplateModel, TemplateModelIterator

public class IteratorModel
extends BeanModel
implements TemplateModelIterator, TemplateCollectionModel

A class that adds TemplateModelIterator functionality to the Iterator interface implementers.

It differs from the SimpleCollection in that it inherits from BeanModel, and therefore you can call methods on it directly, even to the effect of calling iterator.remove() in the template.

Using the model as a collection model is NOT thread-safe, as iterators are inherently not thread-safe. Further, you can iterate over it only once. Attempts to call the iterator() method after it was already driven to the end once will throw an exception.

Version:

$Id: IteratorModel.java,v 1.26 2003/06/03 13:21:32 szegedia Exp $

Author:

Attila Szegedi

Field Summary

Fields inherited from class freemarker.ext.beans.BeanModel

object, wrapper

Fields inherited from interface freemarker.template.TemplateModel

NOTHING

Constructor Summary

IteratorModel(java.util.Iterator iterator, BeansWrapper wrapper)
Creates a new model that wraps the specified iterator object.

Method Summary

boolean	getAsBoolean() Returns Iterator.hasNext().
boolean	hasNext() Calls underlying Iterator.hasNext().
TemplateModelIterator	iterator() This allows the iterator to be used in a <foreach> block.
TemplateModel	next() Calls underlying Iterator.next() and wraps the result.

Methods inherited from class freemarker.ext.beans.BeanModel

get, getAdaptedObject, getWrappedObject, hasPlainGetMethod, invokeGenericGet, isEmpty, keys, keySet, size, toString, unwrap, values, wrap

Methods inherited from class java.lang.Object

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

Constructor Detail

IteratorModel

public IteratorModel(java.util.Iterator iterator,
                     BeansWrapper wrapper)

Creates a new model that wraps the specified iterator object.

Parameters:

iterator - the iterator object to wrap into a model.

wrapper - the BeansWrapper associated with this model. Every model has to have an associated BeansWrapper instance. The model gains many attributes from its wrapper, including the caching behavior, method exposure level, method-over-item shadowing policy etc.

Method Detail

iterator

public TemplateModelIterator iterator()
                               throws TemplateModelException

This allows the iterator to be used in a <foreach> block.

Specified by:

iterator in interface TemplateCollectionModel

Returns:

"this"

Throws:

TemplateModelException

hasNext

public boolean hasNext()

Calls underlying Iterator.hasNext().

Specified by:

hasNext in interface TemplateModelIterator

Returns:

whether there are any more items to iterate over.

next

public TemplateModel next()
                   throws TemplateModelException

Calls underlying Iterator.next() and wraps the result.

Specified by:

next in interface TemplateModelIterator

Throws:

TemplateModelException - if the next model can not be retrieved (i.e. because the iterator is exhausted).

getAsBoolean

public boolean getAsBoolean()

Returns Iterator.hasNext(). Therefore, an iterator that has no more element evaluates to false, and an iterator that has further elements evaluates to true.