org.deegree.model.filterencoding
Class Function

java.lang.Object
  org.deegree.model.filterencoding.Expression
      org.deegree.model.filterencoding.Function

public class Function
extends Expression

Encapsulates the information of a Functionelement as defined in the Expression DTD.

Version:

07.08.2002

Author:

Markus Schneider

Field Summary

Fields inherited from class org.deegree.model.filterencoding.Expression

id

Constructor Summary

Function(String name, List args)
Constructs a new Function.

Method Summary

static Expression	buildFromDOM(Element element) Given a DOM-fragment, a corresponding Expression-object is built.
Object	evaluate(Feature feature) Returns the Function's value (to be used in the evaluation of a complexer Expression).
List	getArguments() returns the arguments of the function
String	getName() Returns the Function's name.
void	setName(String name)
StringBuffer	toXML() Produces an indented XML representation of this object.

Methods inherited from class org.deegree.model.filterencoding.Expression

getExpressionId, getExpressionName

Methods inherited from class java.lang.Object

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

Constructor Detail

Function

public Function(String name,
                List args)

Constructs a new Function.

Method Detail

buildFromDOM

public static Expression buildFromDOM(Element element)
                               throws FilterConstructionException

Given a DOM-fragment, a corresponding Expression-object is built. This method recursively calls other buildFromDOM () - methods to validate the structure of the DOM-fragment.

Throws:

FilterConstructionException - if the structure of the DOM-fragment is invalid

getName

public String getName()

Returns the Function's name.

Returns:

functions name

setName

public void setName(String name)

Parameters:

name -

See Also:

getName()

getArguments

public List getArguments()

returns the arguments of the function

Returns:

arguments of the function

toXML

public StringBuffer toXML()

Produces an indented XML representation of this object.

Specified by:

toXML in class Expression

Returns:

xml representation

evaluate

public Object evaluate(Feature feature)
                throws FilterEvaluationException

Returns the Function's value (to be used in the evaluation of a complexer Expression).

Specified by:

evaluate in class Expression

Parameters:

feature - that determines the concrete values of PropertyNames found in the expression

Returns:

the resulting value

Throws:

FilterEvaluationException - if the evaluation fails