org.quattor.pan.dml.operators
Class SelfSimpleVariable

java.lang.Object
  org.quattor.pan.dml.AbstractOperation
      org.quattor.pan.dml.operators.Variable
          org.quattor.pan.dml.operators.SimpleVariable
              org.quattor.pan.dml.operators.SelfSimpleVariable

All Implemented Interfaces:

Operation

public final class SelfSimpleVariable
extends SimpleVariable

Looks up a simple variable in the execution context.

Author:

loomis

Field Summary

Fields inherited from class org.quattor.pan.dml.operators.Variable

identifier, lookupOnly

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

ops, sourceRange

Constructor Summary

SelfSimpleVariable(SourceRange sourceRange, boolean lookupOnly)

Method Summary

void	checkInvalidSelfContext() Default implementation recursively calls this method on all of the contained operations (arguments).
Element	execute(Context context) Execute this operation within the given context.

Methods inherited from class org.quattor.pan.dml.operators.SimpleVariable

toString

Methods inherited from class org.quattor.pan.dml.operators.Variable

getInstance, getInstance, getInstance

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

calculateArgs, calculateTerms, checkRestrictedContext, getOperations, getSourceRange

Methods inherited from class java.lang.Object

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

Constructor Detail

SelfSimpleVariable

public SelfSimpleVariable(SourceRange sourceRange,
                          boolean lookupOnly)

Method Detail

checkInvalidSelfContext

public void checkInvalidSelfContext()
                             throws SyntaxException

Description copied from class: AbstractOperation

Default implementation recursively calls this method on all of the contained operations (arguments). Subclasses that reference SELF should override this method and throw a SyntaxException.

Specified by:

checkInvalidSelfContext in interface Operation

Overrides:

checkInvalidSelfContext in class AbstractOperation

Throws:

SyntaxException - if operation references SELF

execute

public Element execute(Context context)

Description copied from interface: Operation

Execute this operation within the given context. If an error occurs, an EvaluationException will be thrown with the details.

Specified by:

execute in interface Operation

Overrides:

execute in class SimpleVariable

Parameters:

context - evaluation context for the statement

Returns:

Element produced by running operation