freemarker.template.instruction
Class FunctionModel

java.lang.Object
  freemarker.template.instruction.FunctionModel

All Implemented Interfaces:

TemplateFunctionModel, TemplateModel, java.io.Serializable

public final class FunctionModel
extends java.lang.Object
implements java.io.Serializable, TemplateFunctionModel

An immutable TemplateModel wrapper for a FunctionInstructions. This approach allows us to add functions to the data model, while still enforcing the restriction that every element of the data model should implement the TemplateModel interface.

Notably, this class is a direct subclass of TemplateModel, rather than going through an intermediate interface.

See Also:

Serialized Form

Constructor Summary

FunctionModel(FunctionInstruction function)
Constructor for the function model.

Method Summary

void	callFunction(TemplateWriteableHashModel modelRoot, java.io.Writer out, TemplateRuntimeHandler eventHandler, java.util.List argValues) Calls the specified FunctionInstruction.
boolean	isEmpty() Is the function model populated?
java.lang.String	toString() Returns a string representation of the object.

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionModel

public FunctionModel(FunctionInstruction function)

Constructor for the function model.

Parameters:

function - the function to be stored in the model

Throws:

java.lang.NullPointerException - the function is null

Method Detail

isEmpty

public boolean isEmpty()

Is the function model populated?

Specified by:

isEmpty in interface TemplateModel

Returns:

true if there is no function instruction associated with the model, otherwise false

callFunction

public void callFunction(TemplateWriteableHashModel modelRoot,
                         java.io.Writer out,
                         TemplateRuntimeHandler eventHandler,
                         java.util.List argValues)
                  throws java.io.IOException

Calls the specified FunctionInstruction.

Specified by:

callFunction in interface TemplateFunctionModel

Parameters:

modelRoot - the root of the template model

out - the output stream to send the results

eventHandler - handler for any events fired

argValues - the arguments passed to the function

Throws:

java.io.IOException - there was an IO error writing the results

toString

public java.lang.String toString()

Returns a string representation of the object.

Overrides:

toString in class java.lang.Object

Returns:

a String representing this instruction subtree