org.delia.runner

Interface Runner

All Superinterfaces:

VarEvaluator

All Known Implementing Classes:

RunnerImpl

public interface Runner
extends VarEvaluator

The main runtime engine for Delia. Executes a compiled AST object such as TypeStatementExp. Please create a new Runner object for each next execution. This class is not thread-safe. Only use it as a local var.

Author:

Ian Rae

Method Summary

Modifier and Type	Method and Description
DeliaGeneratePhase	createGenerator() Get a generator which can be used to render DValues into xml,json,etc
TypeRunner	createTypeRunner()
ResultValue	executeOneStatement(Exp exp) Execute a single statement.
ResultValue	executeProgram(List<Exp> expL) Execute a single statement.
boolean	exists(String varName) Does the given variable exist.
InternalCompileState	getCompileState() Get the compiler state.
ExecutionState	getExecutionState() Get the new execution context.
Log	getLog()
DTypeRegistry	getRegistry()
SprigService	getSprigSvc()
ResultValue	getVar(String varName) Gets a variable's value
boolean	init(ExecutionState execState) Initialize the runner.

Methods inherited from interface org.delia.runner.VarEvaluator

evalVarAsString, lookupVar

Method Detail

getLog

Log getLog()

createGenerator

DeliaGeneratePhase createGenerator()

Get a generator which can be used to render DValues into xml,json,etc

Returns:

a generator

getCompileState

InternalCompileState getCompileState()

Get the compiler state. Used by compiler passes to verify and link the delia code.

Returns:

the internal compile state

getExecutionState

ExecutionState getExecutionState()

Get the new execution context. Used when you want to execute again with the same types (i.e. same registry).

Returns:

the execution state

init

boolean init(ExecutionState execState)

Initialize the runner. Should be called once after creating the Runner object. If we are continuing a previous run the execution state pass it in execState. If null is passed for execState then a new state will be created.

Parameters:

execState - - if null then runner will create a new execution state.

Returns:

success flag

executeOneStatement

ResultValue executeOneStatement(Exp exp)

Execute a single statement. For advance use only.

Parameters:

exp - AST object to execute

Returns:

result value

executeProgram

ResultValue executeProgram(List<Exp> expL)

Execute a single statement.

Parameters:

expL - AST object to execute

Returns:

result value

exists

boolean exists(String varName)

Does the given variable exist. example: let x = Customer[true] would create a variable 'x'.

Parameters:

varName - variable name

Returns:

true if exists

getVar

ResultValue getVar(String varName)

Gets a variable's value

Parameters:

varName - variable name

Returns:

null if not found

getRegistry

DTypeRegistry getRegistry()

createTypeRunner

TypeRunner createTypeRunner()

getSprigSvc

SprigService getSprigSvc()