org.quattor.pan.dml.operators
Class IfElse

java.lang.Object
  org.quattor.pan.dml.AbstractOperation
      org.quattor.pan.dml.operators.IfElse

All Implemented Interfaces:

Operation

public final class IfElse
extends AbstractOperation

Implements an if operation with an optional else clause.

Author:

loomis

Field Summary

Fields inherited from class org.quattor.pan.dml.AbstractOperation

ops, sourceRange

Method Summary

Element	execute(Context context) Perform the if statement.
static Operation	newOperation(SourceRange sourceRange, Operation... ops)

Methods inherited from class org.quattor.pan.dml.AbstractOperation

calculateArgs, calculateTerms, checkInvalidSelfContext, checkRestrictedContext, getOperations, getSourceRange, toString

Methods inherited from class java.lang.Object

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

Method Detail

newOperation

public static Operation newOperation(SourceRange sourceRange,
                                     Operation... ops)
                              throws SyntaxException

Throws:

SyntaxException

execute

public Element execute(Context context)

Perform the if statement. It will pop a boolean from the data stack. If that boolean is false the next operand if popped from the operand stack; if true, nothing is done.

Specified by:

execute in interface Operation

Specified by:

execute in class AbstractOperation

Parameters:

context - evaluation context for the statement

Returns:

Element produced by running operation