Package freemarker.template

Class DefaultNonListCollectionAdapter

java.lang.Object

freemarker.template.WrappingTemplateModel

freemarker.template.DefaultNonListCollectionAdapter

All Implemented Interfaces:

WrapperTemplateModel, AdapterTemplateModel, TemplateCollectionModel, TemplateCollectionModelEx, TemplateModel, TemplateModelWithAPISupport, Serializable

public class DefaultNonListCollectionAdapter
extends WrappingTemplateModel
implements TemplateCollectionModelEx, AdapterTemplateModel, WrapperTemplateModel, TemplateModelWithAPISupport, Serializable

Adapts a non-List Java Collection to the corresponding TemplateModel interface(s), most importantly to TemplateCollectionModelEx. For List-s, use DefaultListAdapter, or else you lose indexed element access.

Thread safety: A DefaultNonListCollectionAdapter is as thread-safe as the Collection that it wraps is. Normally you only have to consider read-only access, as the FreeMarker template language doesn't allow writing these collections (though of course, Java methods called from the template can violate this rule).

This adapter is used by DefaultObjectWrapper if its useAdaptersForCollections property is true, which is the default when its incompatibleImprovements property is 2.3.22 or higher, and its forceLegacyNonListCollections property is false, which is still not the default as of 2.3.22 (so you have to set it explicitly).

Since:

2.3.22

See Also:

Serialized Form

Field Summary

Fields inherited from interface freemarker.template.TemplateModel

NOTHING

Method Summary

Modifier and Type	Method	Description
static DefaultNonListCollectionAdapter	adapt(Collection collection, ObjectWrapperWithAPISupport wrapper)	Factory method for creating new adapter instances.
boolean	contains(TemplateModel item)
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.
boolean	isEmpty()	Returns if the collection contains any elements.
TemplateModelIterator	iterator()	Retrieves a template model iterator that is used to iterate over the elements in this collection.
int	size()	Returns the number items in this collection, or Integer.MAX_VALUE, if there are more than Integer.MAX_VALUE items.

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 DefaultNonListCollectionAdapter adapt(Collection collection,
 ObjectWrapperWithAPISupport wrapper)

Factory method for creating new adapter instances.

Parameters:

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

wrapper - The ObjectWrapper used to wrap the items in the collection. 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

size

public int size()

Description copied from interface: TemplateCollectionModelEx

Returns the number items in this collection, or Integer.MAX_VALUE, if there are more than Integer.MAX_VALUE items.

Specified by:

size in interface TemplateCollectionModelEx

isEmpty

public boolean isEmpty()

Description copied from interface: TemplateCollectionModelEx

Returns if the collection contains any elements. This differs from size() != 0 only in that the exact number of items need not be calculated.

Specified by:

isEmpty in interface TemplateCollectionModelEx

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.

contains

public boolean contains(TemplateModel item)
                 throws TemplateModelException

Throws:

TemplateModelException

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