org.deegree.filter.expression
Class Sub

java.lang.Object
  org.deegree.filter.expression.Sub

All Implemented Interfaces:

Expression

public class Sub
extends Object
implements Expression

TODO add documentation here

Version:

$Revision:$, $Date:$

Author:

Markus Schneider , last edited by: $Author:$

Nested Class Summary

Nested classes/interfaces inherited from interface org.deegree.filter.Expression

Expression.Type

Constructor Summary

Sub(Expression param1, Expression param2)

Method Summary

<T> TypedObjectNode[]	evaluate(T obj, XPathEvaluator<T> xpathEvaluator) Determines the values of the expression for the given context object.
Expression	getParameter1()
Expression	getParameter2()
Expression[]	getParams() Returns the expression's paramters.
Expression.Type	getType() Returns the type of expression.
String	toString(String indent)

Methods inherited from class java.lang.Object

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

Constructor Detail

Sub

public Sub(Expression param1,
           Expression param2)

Method Detail

getParameter1

public Expression getParameter1()

getParameter2

public Expression getParameter2()

getType

public Expression.Type getType()

Description copied from interface: Expression

Returns the type of expression. Use this to safely determine the subtype of Expression.

Specified by:

getType in interface Expression

Returns:

type of expression

evaluate

public <T> TypedObjectNode[] evaluate(T obj,
                                      XPathEvaluator<T> xpathEvaluator)
                           throws FilterEvaluationException

Description copied from interface: Expression

Determines the values of the expression for the given context object.

Note that this returns an TypedObjectNode[], as an expression may evaluate to multiple values, e.g. a ValueReference that targets a multi property of a feature.

Specified by:

evaluate in interface Expression

Type Parameters:

T - type of the context object

Parameters:

obj - object that the expression is evaluated upon, must not be null

xpathEvaluator - used for evaluation of XPath expressions, must not be null

Returns:

the values of the expression, may be empty (and even contain null values), but never null

Throws:

FilterEvaluationException

toString

public String toString(String indent)

Specified by:

toString in interface Expression

getParams

public Expression[] getParams()

Description copied from interface: Expression

Returns the expression's paramters.

Specified by:

getParams in interface Expression

Returns:

the parameters of the expression