freemarker.ext.beans
Class CollectionModel

java.lang.Object
  freemarker.ext.beans.BeanModel
      freemarker.ext.beans.StringModel
          freemarker.ext.beans.CollectionModel

All Implemented Interfaces:

WrapperTemplateModel, AdapterTemplateModel, TemplateCollectionModel, TemplateHashModel, TemplateHashModelEx, TemplateModel, TemplateScalarModel, TemplateSequenceModel

public class CollectionModel
extends StringModel
implements TemplateCollectionModel, TemplateSequenceModel

A special case of BeanModel that can wrap Java collections and that implements the TemplateCollectionModel in order to be usable in a <foreach> block.

Version:

$Id: CollectionModel.java,v 1.22 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

Fields inherited from interface freemarker.template.TemplateScalarModel

EMPTY_STRING

Constructor Summary

CollectionModel(java.util.Collection collection, BeansWrapper wrapper)
Creates a new model that wraps the specified collection object.

Method Summary

TemplateModel	get(int index) Retrieves the i-th object from the collection, wrapped as a TemplateModel.
boolean	getSupportsIndexedAccess() Tells if get(int) will always fail for this object.
TemplateModelIterator	iterator() Retrieves a template model iterator that is used to iterate over the elements in this collection.
int	size()

Methods inherited from class freemarker.ext.beans.StringModel

getAsString

Methods inherited from class freemarker.ext.beans.BeanModel

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

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectionModel

public CollectionModel(java.util.Collection collection,
                       BeansWrapper wrapper)

Creates a new model that wraps the specified collection object.

Parameters:

collection - the collection 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

get

public TemplateModel get(int index)
                  throws TemplateModelException

Retrieves the i-th object from the collection, wrapped as a TemplateModel.

Specified by:

get in interface TemplateSequenceModel

Returns:

the item at the specified index, or null if the index is out of bounds. Note that a null value is interpreted by FreeMarker as "variable does not exist", and accessing a missing variables is usually considered as an error in the FreeMarker Template Language, so the usage of a bad index will not remain hidden.

Throws:

TemplateModelException - if the index is out of bounds, or the underlying collection is not a List.

getSupportsIndexedAccess

public boolean getSupportsIndexedAccess()

Tells if get(int) will always fail for this object. As this object implements TemplateSequenceModel, get(int) should always work, but due to a design flaw, for non-List wrapped objects get(int) will always fail. This method exists to ease working this problem around.

iterator

public TemplateModelIterator iterator()

Description copied from interface: TemplateCollectionModel

Retrieves a template model iterator that is used to iterate over the elements in this collection.

Specified by:

iterator in interface TemplateCollectionModel

size

public int size()

Specified by:

size in interface TemplateHashModelEx

Specified by:

size in interface TemplateSequenceModel

Overrides:

size in class BeanModel

Returns:

the number of key/value mappings in the hash.