Package com.singularsys.extensions.chained

Class ChainingOpPfmc

java.lang.Object

com.singularsys.jep.functions.PostfixMathCommand

com.singularsys.extensions.chained.ChainingOpPfmc

All Implemented Interfaces:

CallbackEvaluationI, PostfixMathCommandI, Serializable

public class ChainingOpPfmc
extends PostfixMathCommand
implements CallbackEvaluationI

An PFMC which allows a method chaining syntax. So

[1..10] . map(x->x^2)

becomes

map(x->x^2, [1..10])

During evaluation the evaluate(Node, Evaluator) method first evaluates the left hand side of the operator and then checks the right hand side is a function that implements ChainedFunctionI, if so it calls the ChainedFunctionI.apply(Evaluator, Node, Object) method of this function, passing the value from the left hand side as an additional argument.

See Also:

• Serialized Form

Field Summary

Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand

curNumberOfParameters, description, name, NaN, numberOfParameters

Constructor Summary

Constructors

Constructor	Description
ChainingOpPfmc()

Method Summary

Modifier and Type	Method	Description
Object	evaluate(Node node, Evaluator pv)	Performs some special evaluation on the node.

Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand

asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, asType, checkNumberOfParameters, getDescription, getDescription, getDescriptionWithType, getName, getNumberOfParameters, run, setCurNumberOfParameters, setDescription, setName, toString, toString

Methods inherited from class java.lang.Object

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

Constructor Details

ChainingOpPfmc

public ChainingOpPfmc()

Method Details

evaluate

public Object evaluate(Node node,
 Evaluator pv)
                throws EvaluationException

Description copied from interface: CallbackEvaluationI

Performs some special evaluation on the node. This method has the responsibility for evaluating the children of the node, and it should generally call

 pv.eval(node.jjtGetChild(i))   
 

for each child. The SymbolTable is not passed as an argument. This is because it is better practice to get and set variable values by using node.getVar().setValue() rather that through the SymbolTable with requires a hashtable lookup.

Specified by:

evaluate in interface CallbackEvaluationI

Parameters:

node - The current node

pv - The visitor, can be used evaluate the children

Returns:

the value after evaluation. This value will be passed to other functions higher up the node tree. The value can be any type including Double or Vector<Object>

Throws:

EvaluationException - if the calculation cannot be performed

See Also:

• Evaluator