Package freemarker.template

Class SimpleSequence

java.lang.Object

freemarker.template.WrappingTemplateModel

freemarker.template.SimpleSequence

All Implemented Interfaces:

TemplateModel, TemplateSequenceModel, Serializable

Direct Known Subclasses:

SimpleList

public class SimpleSequence
extends WrappingTemplateModel
implements TemplateSequenceModel, Serializable

A convenient implementation of a list. This object implements TemplateSequenceModel, using an underlying java.util.List implementation.

A SimpleSequence can act as a cache for a TemplateCollectionModel, e.g. one that gets data from a database. When passed a TemplateCollectionModel as an argument to its constructor, the SimpleSequence immediately copies all the elements and discards the TemplateCollectionModel.

This class is thread-safe if you don't call the add method after you have made the object available for multiple threads.

Note:
As of 2.0, this class is unsynchronized by default. To obtain a synchronized wrapper, call the synchronizedWrapper() method.

See Also:

• SimpleHash
• SimpleScalar
• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface freemarker.template.TemplateModel

TemplateModel.InvalidExpressionModel, TemplateModel.JavaNull

Field Summary

Fields

Modifier and Type	Field	Description
protected final List<Object>	list

Fields inherited from interface freemarker.template.TemplateModel

INVALID_EXPRESSION, JAVA_NULL, NOTHING

Constructor Summary

Constructors

Constructor	Description
SimpleSequence()	Constructs an empty simple sequence that will use the the default object wrapper set in WrappingTemplateModel.setDefaultObjectWrapper(ObjectWrapper).
SimpleSequence(int capacity)	Constructs an empty simple sequence with preallocated capacity and using the default object wrapper set in WrappingTemplateModel.setDefaultObjectWrapper(ObjectWrapper).
SimpleSequence(ObjectWrapper wrapper)	Constructs an empty simple sequence using the specified object wrapper.
SimpleSequence(TemplateCollectionModel tcm)	Constructs a simple sequence from the passed collection model using the default object wrapper set in WrappingTemplateModel.setDefaultObjectWrapper(ObjectWrapper).
SimpleSequence(Collection collection)	Constructs a simple sequence that will contain the elements from the specified Collection and will use the the default object wrapper set in WrappingTemplateModel.setDefaultObjectWrapper(ObjectWrapper).
SimpleSequence(Collection<?> collection, ObjectWrapper wrapper)	Constructs a simple sequence that will contain the elements from the specified Collection and will use the specified object wrapper.

Method Summary

Modifier and Type	Method	Description
void	add(boolean b)	Adds a boolean to the end of this SimpleSequence, by coercing the boolean into TemplateBooleanModel.TRUE or TemplateBooleanModel.FALSE.
void	add(Object obj)	Adds an arbitrary object to the end of this SimpleSequence.
TemplateModel	get(int i)	Retrieves the i-th template model in this sequence.
int	size()
SimpleSequence	synchronizedWrapper()
List	toList()	Note that this method creates and returns a deep-copy of the underlying list used internally.
String	toString()

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, wait, wait, wait

Field Details

list

protected final List<Object> list

Constructor Details

SimpleSequence

public SimpleSequence()

Constructs an empty simple sequence that will use the the default object wrapper set in WrappingTemplateModel.setDefaultObjectWrapper(ObjectWrapper).

SimpleSequence

public SimpleSequence(int capacity)

Constructs an empty simple sequence with preallocated capacity and using the default object wrapper set in WrappingTemplateModel.setDefaultObjectWrapper(ObjectWrapper).

SimpleSequence

public SimpleSequence(Collection collection)

Constructs a simple sequence that will contain the elements from the specified Collection and will use the the default object wrapper set in WrappingTemplateModel.setDefaultObjectWrapper(ObjectWrapper).

Parameters:

collection - the collection containing initial values. Note that a copy of the collection is made for internal use.

SimpleSequence

public SimpleSequence(TemplateCollectionModel tcm)
               throws TemplateModelException

Constructs a simple sequence from the passed collection model using the default object wrapper set in WrappingTemplateModel.setDefaultObjectWrapper(ObjectWrapper).

Throws:

TemplateModelException

SimpleSequence

public SimpleSequence(ObjectWrapper wrapper)

Constructs an empty simple sequence using the specified object wrapper.

Parameters:

wrapper - The object wrapper to use to wrap objects into TemplateModel instances. If null, the default wrapper set in WrappingTemplateModel.setDefaultObjectWrapper(ObjectWrapper) is used.

SimpleSequence

public SimpleSequence(Collection<?> collection,
 ObjectWrapper wrapper)

Constructs a simple sequence that will contain the elements from the specified Collection and will use the specified object wrapper.

Parameters:

collection - the collection containing initial values. Note that a copy of the collection is made for internal use.

wrapper - The object wrapper to use to wrap objects into TemplateModel instances. If null, the default wrapper set in WrappingTemplateModel.setDefaultObjectWrapper(ObjectWrapper) is used.

Method Details

add

public void add(Object obj)

Adds an arbitrary object to the end of this SimpleSequence. If the object itself does not implement the TemplateModel interface, it will be wrapped into an appropriate adapter on the first call to get(int).

Parameters:

obj - the boolean to be added.

add

public void add(boolean b)

Adds a boolean to the end of this SimpleSequence, by coercing the boolean into TemplateBooleanModel.TRUE or TemplateBooleanModel.FALSE.

Parameters:

b - the boolean to be added.

toList

public List toList()
            throws TemplateModelException

Note that this method creates and returns a deep-copy of the underlying list used internally. This could be a gotcha for some people at some point who want to alter something in the data model, but we should maintain our immutability semantics (at least using default SimpleXXX wrappers) for the data model. It will recursively unwrap the stuff in the underlying container.

Throws:

TemplateModelException

get

public TemplateModel get(int i)
                  throws TemplateModelException

Description copied from interface: TemplateSequenceModel

Retrieves the i-th template model in this sequence.

Specified by:

get in interface TemplateSequenceModel

Returns:

the specified index in the list

Throws:

TemplateModelException

size

public int size()

Specified by:

size in interface TemplateSequenceModel

Returns:

the number of items in the list.

synchronizedWrapper

public SimpleSequence synchronizedWrapper()

Returns:

a synchronized wrapper for list.

toString

public String toString()

Overrides:

toString in class Object