org.quattor.pan.dml.operators

Class Add

java.lang.Object

org.quattor.pan.dml.AbstractOperation

org.quattor.pan.dml.operators.Add

All Implemented Interfaces:

Operation

public final class Add
extends AbstractOperation

Implements an addition operation for longs, doubles, and strings. If this is a numeric operation and one of the arguments is a double, the result is a double; otherwise, the result is a long.

Author:

loomis

Field Summary

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

ops, sourceRange

Method Summary

Methods

Modifier and Type	Method and Description
Element	execute(Context context) Perform the addition of the two top values on the data stack in the given DMLContext.
static Operation	newOperation(SourceRange sourceRange, Operation... ops) Factory class for creating a new Add operation.

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

Factory class for creating a new Add operation. Because of optimization, this class may actually return an element if the result can be determined at compile time.

Parameters:

sourceRange - location of this operation in the source

ops - arguments for this operation

Returns:

optimized Operation for this Add expression

Throws:

SyntaxException

execute

public Element execute(Context context)

Perform the addition of the two top values on the data stack in the given DMLContext. This method will handle long, double, and string values. Exceptions are thrown if the types of the arguments do not match or they are another type.

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