com.alibaba.qlexpress4.runtime.scope

Interface QScope

All Known Subinterfaces:

QContext

All Known Implementing Classes:

DelegateQContext, QvmBlockScope, QvmGlobalScope

public interface QScope

Author: DQinYuan

Method Summary

Modifier and Type	Method and Description
void	defineFunction(java.lang.String functionName, CustomFunction function) define local function in scope
void	defineLocalSymbol(java.lang.String varName, java.lang.Class<?> varClz, java.lang.Object value) define a symbol in local scope
CustomFunction	getFunction(java.lang.String functionName) get function or lambda define
java.util.Map<java.lang.String,CustomFunction>	getFunctionTable() get function table in this scope
QScope	getParent()
Value	getSymbol(java.lang.String varName) get assignable symbol variable by name
default java.lang.Object	getSymbolValue(java.lang.String varName) get symbol variable value by name
QScope	newScope()
Value	peek()
Value	pop() pop one element on top of stack
Parameters	pop(int number) pop number elements on top of stack
void	push(Value value) push value on the top of stack

Method Detail

getSymbol

Value getSymbol(java.lang.String varName)

get assignable symbol variable by name

Parameters:

varName - variable name

Returns:

value, null if not exist

getSymbolValue

default java.lang.Object getSymbolValue(java.lang.String varName)

get symbol variable value by name

Parameters:

varName - variable name

Returns:

inner value, null if not exist

defineLocalSymbol

void defineLocalSymbol(java.lang.String varName,
                       java.lang.Class<?> varClz,
                       java.lang.Object value)

define a symbol in local scope

Parameters:

varName - variable name

varClz - class of variable

value - init value

defineFunction

void defineFunction(java.lang.String functionName,
                    CustomFunction function)

define local function in scope

Parameters:

functionName - name of function

function - implement of function

getFunction

CustomFunction getFunction(java.lang.String functionName)

get function or lambda define

Parameters:

functionName - name of function

Returns:

null if not exist

getFunctionTable

java.util.Map<java.lang.String,CustomFunction> getFunctionTable()

get function table in this scope

Returns:

function table

push

void push(Value value)

push value on the top of stack

Parameters:

value - pushed element

pop

Parameters pop(int number)

pop number elements on top of stack

Parameters:

number - pop elements' number

Returns:

popped elements

pop

Value pop()

pop one element on top of stack

Returns:

popped element

peek

Value peek()

Returns:

top element of stack without pop

getParent

QScope getParent()

Returns:

parent scope

newScope

QScope newScope()

Returns:

new scope base origin stack