Package freemarker.template

Class DefaultIterableAdapter

java.lang.Object

freemarker.template.WrappingTemplateModel

freemarker.template.DefaultIterableAdapter

All Implemented Interfaces:

WrapperTemplateModel, AdapterTemplateModel, TemplateCollectionModel, TemplateModel, TemplateModelWithAPISupport, Serializable

public class DefaultIterableAdapter
extends WrappingTemplateModel
implements TemplateCollectionModel, AdapterTemplateModel, WrapperTemplateModel, TemplateModelWithAPISupport, Serializable

Adapts an Iterable to the corresponding TemplateModel interface(s), most importantly to TemplateCollectionModel. This should only be used if Collection is not implemented by the adapted object, because then DefaultListAdapter and DefaultNonListCollectionAdapter gives more functionality.

Thread safety: A DefaultIterableAdapter is as thread-safe as the Iterable that it wraps is. Normally you only have to consider read-only access, as the FreeMarker template language doesn't provide means to call Iterator modifier methods (though of course, Java methods called from the template can violate this rule).

This adapter is used by DefaultObjectWrapper if its iterableSupport property is true, which is not the default for backward compatibility (so you have to set it explicitly).

Since:

2.3.25

See Also:

Serialized Form

Field Summary

Fields inherited from interface freemarker.template.TemplateModel

NOTHING

Method Summary

Modifier and Type	Method	Description
static DefaultIterableAdapter	adapt(Iterable<?> iterable, ObjectWrapperWithAPISupport wrapper)	Factory method for creating new adapter instances.
Object	getAdaptedObject(Class hint)	Retrieves the underlying object, or some other object semantically equivalent to its value narrowed by the class hint.
TemplateModel	getAPI()	Returns the model that exposes the (Java) API of the value.
Object	getWrappedObject()	Retrieves the original object wrapped by this model.
TemplateModelIterator	iterator()	Retrieves a template model iterator that is used to iterate over the elements in this collection.

Methods inherited from class freemarker.template.WrappingTemplateModel

getDefaultObjectWrapper, getObjectWrapper, setDefaultObjectWrapper, setObjectWrapper, wrap

Methods inherited from class java.lang.Object

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

Method Details

adapt

public static DefaultIterableAdapter adapt(Iterable<?> iterable,
 ObjectWrapperWithAPISupport wrapper)

Factory method for creating new adapter instances.

Parameters:

iterable - The collection to adapt; can't be null.

wrapper - The ObjectWrapper used to wrap the items in the array. Has to be ObjectWrapperAndUnwrapper because of planned future features.

iterator

public TemplateModelIterator iterator()
                               throws TemplateModelException

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

Throws:

TemplateModelException

getWrappedObject

public Object getWrappedObject()

Description copied from interface: WrapperTemplateModel

Retrieves the original object wrapped by this model.

Specified by:

getWrappedObject in interface WrapperTemplateModel

getAdaptedObject

public Object getAdaptedObject(Class hint)

Description copied from interface: AdapterTemplateModel

Retrieves the underlying object, or some other object semantically equivalent to its value narrowed by the class hint.

Specified by:

getAdaptedObject in interface AdapterTemplateModel

Parameters:

hint - the desired class of the returned value. An implementation should make reasonable effort to retrieve an object of the requested class, but if that is impossible, it must at least return the underlying object as-is. As a minimal requirement, an implementation must always return the exact underlying object when hint.isInstance(underlyingObject) holds. When called with java.lang.Object.class, it should return a generic Java object (i.e. if the model is wrapping a scripting language object that is further wrapping a Java object, the deepest underlying Java object should be returned).

Returns:

the underlying object, or its value accommodated for the hint class.

getAPI

public TemplateModel getAPI()
                     throws TemplateModelException

Description copied from interface: TemplateModelWithAPISupport

Returns the model that exposes the (Java) API of the value. This is usually implemented by delegating to ObjectWrapperWithAPISupport.wrapAsAPI(Object).

Specified by:

getAPI in interface TemplateModelWithAPISupport

Throws:

TemplateModelException