org.deegree.model.filterencoding
Class Literal

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

public class Literal
extends Expression

Encapsulates the information of a element as defined in the FeatureId DTD.

Version:

07.08.2002

Author:

Markus Schneider

Field Summary

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

id

Constructor Summary

Literal(String value)
Constructs a new Literal.

Method Summary

static Expression	buildFromDOM(Element element) Given a DOM-fragment, a corresponding Expression-object is built.
Object	evaluate(Feature feature) Returns the Literal's value (to be used in the evaluation of a complexer Expression).
String	getValue() Returns the literal's value (as String).
void	setValue(String value)
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

Literal

public Literal(String value)

Constructs a new Literal.

Parameters:

value -

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.

Parameters:

element -

Throws:

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

getValue

public String getValue()

Returns the literal's value (as String).

Returns:

the literal's value (as String).

setValue

public void setValue(String value)

Parameters:

value -

See Also:

getValue()

toXML

public StringBuffer toXML()

Produces an indented XML representation of this object.

Specified by:

toXML in class Expression

Returns:

XML representation of this object.

evaluate

public Object evaluate(Feature feature)

Returns the Literal's value (to be used in the evaluation of a complexer Expression). If the value appears to be numerical, a Double is returned, else a String. TODO: Improve datatype handling.

Specified by:

evaluate in class Expression

Parameters:

feature - that determines the values of PropertyNames in the expression (no use here)

Returns:

the resulting value